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7th grade review day 1

Total questions: 189

Worksheet time: 3hrs 16mins

Name
Class
Date
1.

If you melt a popsicle, it this a chemical or physical change?

a)

physical

b)

chemical

2.

If you burn your marshmallow while making smores, is this a chemical or physical change?

a)

physical

b)

chemical

3.

Your stomach digests a yummy cookie with enzymes. Is this chemical or physical digestion? Is it both?

a)

physical

b)

chemical

c)

both

4.

Researchers are investigating processes that happen during digestion. Which answer choice describes only a physical change during digestion?

a)

Hydrochloric acid in the stomach breaks down proteins

b)

Chewing in the mouth breaks food into small pieces

c)

Enzymes in saliva start the digestion of starches before food is swallowed

d)

Bacteria in the intestines convert dietary fiber into fats

5.

Many processes occur in the digestive system. Which process is best classified as a physical change?

a)

Saliva converting the starch molecules in crackers into simple sugars

b)

Digestive enzymes breaking down proteins into smaller fragments

c)

Bacteria converting lactose into simple sugars in the intestines

d)

Teeth grinding an almond into smaller pieces in the mouth

6.

Chewing food into smaller pieces.

a)

Physical

b)

Chemical

7.

Saliva breaking down carbohydrates.

a)

Physical

b)

Chemical

8.

Enzymes break down food nutrients.

a)

Physical

b)

Chemical

9.

Chewing food into smaller pieces.

a)

Physical

b)

Chemical

10.

Enzymes break down food nutrients.

a)

Physical

b)

Chemical

11.

Food is mixed together.

a)

Physical

b)

Chemical

12.

Peristalsis: a series of wave-like muscle contractions that moves food to different processing stations in the digestive tract.

a)

Physical

b)

Chemical

13.

Enzyme action.

a)

Physical

b)

Chemical

14.

Scissors cutting a piece of paper

a)

Physical Change

b)

Chemical Change

15.

Natural gas buring to heat a home

a)

Physical Change

b)

Chemical Change

16.

Water condensing on the side of a window

a)

Physical Change

b)

Chemical Change

17.

Filling a balloon with natural air

a)

Physical Change

b)

Chemical Change

18.

Corroding metal (rusting)

a)

Physical Change

b)

Chemical Change

19.

Enzyme breaking down food

a)

Physical Change

b)

Chemical Change

20.

Substances in the mouth breaking down fats and proteins

a)

Physical Change

b)

Chemical Change

21.

Becca breaks Truett's pencil. What type of change has occurred?

a)

physical

b)

chemical

c)

property

22.
Ice turns into water then steam.  This is an example of 
a)
plasma
b)
production
c)
physical change
d)
chemical change
23.
Is cutting an apple into slices an example of a physical change or a chemical change?
a)
Physical Change
b)
Chemical Change
24.
Green bananas turning yellow on their own as they ripen.
a)
Chemical Change
b)
Physical Change
25.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
26.
Baking a cake by mixing flour, sugar, chocolate powder, eggs, and milk, and then heating them in the oven.
a)
Chemical Change
b)
Physical Change
27.
Ice melting
a)
Chemical Change
b)
Physical Change
28.
Water freezing
a)
Chemical Change
b)
Physical Change
29.
Shredding a piece of paper
a)
Chemical Change
b)
Physical Change
30.

Breaking an Egg

a)
Chemical Change
b)
Physical Change
31.

Freezing a popsicle

a)
Chemical Change
b)
Physical Change
32.

Burning Wood

a)
Chemical Change
b)
Physical Change
33.

Cooking an egg

a)
Chemical Change
b)
Physical Change
34.

Rusting Iron

a)
Chemical Change
b)
Physical Change
35.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
36.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
37.

Choose the best description below for the image

a)

physical change

b)

chemical change

38.

Choose the best description below for the image

a)

physical change

b)

chemical change

39.

Choose the best description below for the image

a)

physical change

b)

chemical change

40.

Choose the best description below for the image

a)

physical change

b)

chemical change

41.

Choose the best description below for the image

a)

physical change

b)

chemical change

42.
In physical changes, substances might change in __________ but not in __________.
a)
appearance, composition
b)
volume, state of matter
c)
texture, color
d)
weight, mass
43.

Did a chemical change take place?

a)

yes

b)

no

44.

Did a chemical change take place?

a)

yes

b)

no

45.

Did a chemical change take place?

a)

yes

b)

no

46.

Did a chemical change take place?

a)

yes

b)

no

47.

Did a chemical change take place?

a)

yes

b)

no

48.

Is wood that is burning in a brush pile has heat, and produces ashes an example of a physical or a chemical change?

a)

Physical

b)

Chemical

49.

Is milk going sour a physical or chemical change?

a)

Physical

b)

Chemical

50.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
rust
51.

Is freezing juice an example of a physical change or a chemical change?

a)

Physical Change

b)

Chemical Change

52.

When you break a cracker into pieces it is a...

a)

Chemical change

b)

Physical change

53.

Is digesting your food is an example of a chemical change or a physical change?

a)

chemical change

b)

physical change

54.

Which is an example of a chemical change?

a)

paper cut into small pieces

b)

chocolate melting in a pan

c)

flour and sugar mixed in a bowl

d)

cookies baking in an oven

55.

Is glass breaking into tiny shards an example of a chemical or physical change?

a)

Chemical Change

b)

Physical Change

56.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
57.

Which is an example of a physical change?

a)

Cooking

b)

Buring Wood

c)

Ripping paper

d)

Digesting Food

58.

Which of these four liquids is a mixture, made of parts, some of which can be separated?

a)

salt water

b)

skim milk

c)

orange juice

d)

distilled water (drinking water)

59.

Which is a physical change?

a)

burning wood

b)

rusty nail

c)

freezing water

d)

baking cookies

60.

Which is a chemical change?

a)

rusted bike

b)

cutting an apple

c)

boiling water

d)

tearing paper

61.

What is the best way to separate a mixture of sugar, sand, and water?

a)

Freeze the mixture, causing the water to be destroyed, then sift the sugar from the sand.

b)

Filter the sand from the sugar and water, then heat the mixture, causing the water to evaporate.

c)

Filter the mixture, causing the sugar and sand to get caught but not the water.

d)

Stir the mixture, causing the water to move above the sugar and sand.

62.

A student is investigating changes with common classroom materials. Which of the following BEST describes the conclusion the student can make about the investigations?

a)

The paperclip shows evidence of a physical change by changing the shape of the object, whereas the pencil eraser and hole puncher show evidence of a physical change by changing the size of the object.

b)

All three investigations show evidence of a physical change due to a change in the color of the original substance.

c)

The paperclip and hole puncher shows evidence of a physical change by changing the chemical properties of the original object, whereas the pencil eraser shows evidence of a physical change by changing the size of the object.

d)

All three investigations show evidence of a physical change due to a change in state of matter.

63.

A 5th grade student places baking soda in a cup. The student then adds vinegar to the cup. The student collects the data below from the experiment. Based upon the results of the experiment, which statement BEST describes whether the change is a physical or chemical change.

a)

The data concludes that a physical change has occurred because it had an increased change in temperature, which resulted in the liquid to start bubbling.

b)

The data concludes that a physical change has occurred because the color of the liquid changed when you mixed two materials.

c)

The data concludes that a chemical change has occurred because there was formation of bubbles when the materials reacted to each other.

d)

The data concludes that a chemical change has occurred because mixing two substances together will always result in a reaction.

64.

A 5th grade student places baking soda in a cup. The student then adds vinegar to the cup. The student collects the data below from the experiment. Based upon the results of the experiment, which statement BEST describes whether the change is a physical or chemical change.

a)

The data concludes that a physical change has occurred because it had an increased change in temperature, which resulted in the liquid to start bubbling.

b)

The data concludes that a physical change has occurred because the color of the liquid changed when you mixed two materials.

c)

The data concludes that a chemical change has occurred because there was formation of bubbles when the materials reacted to each other.

d)

The data concludes that a chemical change has occurred because mixing two substances together will always result in a reaction.

65.

A teacher takes a tray of ice cubes out of the freezer. Each student takes an ice cube and holds it in their hands. They make the observations listed in the chart. The student claims that changing the temperature of the water causes a physical change that turns water into ice.

Which argument BEST supports the student’s claim?

a)

The ice cube is melting in the student’s hand since the hands are much warmer than the ice. Heat is being added to the ice, which causes the particles to move faster.

b)

The ice cube is freezing in the student’s hand since the hands are much warmer than the ice. Heat is being removed from the ice, which causes the particles to move slower.

c)

The ice cube is melting in the student’s hand since state is changing from a solid to a liquid. Heat is being removed from the ice, which causes the particles to move faster.

d)

The ice cube is melting in the student’s hand since state is changing from a liquid to a solid. Heat is being added to the ice, which causes the particles to move slower.

66.

A mixture of sand and gravel can be separated by putting it in a container with holes that only the sand can pass through. This method works to separate the mixture because sand and gravel differ in which physical property?

a)

texture

b)

state of matter

c)

color

d)

size

67.
Which of the following is NOT a clue that a chemical change has occurred? 
a)
change of state of matter
b)
color change
c)
production of a gas
d)
production of heat
68.
The particles in a _____ are the farthest apart and move the fastest.
a)
gas
b)
solid
c)
banana
d)
liquid
69.
Mark is observing a burning candle. He notices the melted wax drips down the side of the candle and hardens again. The candle has _____. 
a)
formed a new substance
b)
undergone a physical change
c)
undergone a chemical change
d)
undergone a physical and chemical change
70.
Two children in a wading pool notice that the water level is lower than it was the week before. What happened to the water? 
a)
Some of the water evaporated.
b)
The pool absorbed some of the water.
c)
Condensation caused the water to disappear.
d)
Toys in the pool absorbed some of the water.
71.
A change in a state of matter is represented in the diagrams below. Which statement describes the process occurring from beaker 1 to beaker 2?
a)
Solid ice is changing into gas.
b)
Liquid water is changing to gas.
c)
Solid ice is melting to liquid water.
d)
Gaseous steam is condensing to solid ice.
72.
Which is NOT an example of condensation? 
a)
Dew is found on the grass on a summer morning.
b)
Drops of water form on a cold can of soda on a hot day.
c)
A bucket of water left uncovered eventually becomes empty.
d)
The walls of a bathroom are damp after someone takes shower.
73.
Is a rotting banana an example of a physical or a chemical change?
a)
Physical Change
b)
Chemical Change
74.
Is cutting an apple into slices an example of a physical change or a chemical change?
a)
Physical Change
b)
Chemical Change
75.
Which of the following changes is NOT a physical change?
a)
getting a haircut
b)
sharpening a pencil
c)
spoiled milk
d)
cracking an egg into a bowl
76.
Is rust forming on a bike that has been left outside in the rain an example of a physical or chemical change?
a)
Physical Change
b)
Chemical Change
77.
Students observed as small drops of water collected on the outside of a glass.
Which statement BEST describes why the water vapor in the air formed liquid water on the outside of the glass?
a)
The humidity outside the glass turns the vapor to liquid water.
b)
The water vapor pulls the water from inside the glass to outside the glass.
c)
The temperature of the water inside the glass is colder than the air outside the glass.
d)
The temperature of the water inside the glass is warmer than the air outside the glass.
78.

The image shows what happens when cold medicine tablets are placed in room-temperature water. What evidence would indicate that a new substance is produced?

a)

The tablet dissolves in water

b)

The water becomes cloudy

c)

The water level increases slightly

d)

Bubbles are given off

79.
Physical or Chemical change?
stepping on a Coke can
a)
Physical 
b)
Chemical
80.
Physical or Chemical change?
sodium metal is cut with a knife
a)
Physical 
b)
Chemical
81.
Physical or Chemical change?
glucose dissolves in water
a)
Physical 
b)
Chemical
82.
Physical or Chemical change?
cooking an egg
a)
Physical 
b)
Chemical
83.
Physical or Chemical change?
baking cookies
a)
Physical 
b)
Chemical
84.
Physical or Chemical change?
mixing sand and water
a)
Physical 
b)
Chemical
85.
Physical or Chemical change?
sharpening a pencil
a)
Physical 
b)
Chemical
86.
Physical or Chemical change?
a nail rusting
a)
Physical 
b)
Chemical
87.
Physical or Chemical change?
burning wood
a)
Physical 
b)
Chemical
88.

What is chemical change?

a)

How two chemicals react with one another when combined

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

89.

What is physical change?

a)

How two chemicals react with one another when combined

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

90.
Which is a chemical change?
a)
freezing fruit juice
b)
slicing a potato
c)
boiling water
d)
copper metal turning green
91.

Which of the following is an indication of chemical change

a)

Melting

b)

Freezing

c)

Burning

d)

Evaporating

92.

Thermal energy (heat) is released or absorbed during the reaction explains the _________________

a)

Change in color

b)

Change in temperature

c)

Change in gas

93.

What kind of change an exploding firework?

a)

physical change

b)

chemical change

94.

a banana rotting is what type of change?

a)

chemical change

b)

physical change

95.

baking soda and vinegar chemically combine to make a new substance. What type of change is this?

a)

chemical change

b)

physical change

96.

Ice cream melting is what type of change?

a)

chemical change

b)

physical change

97.

Cutting a pizza into 8 separate slices is what type of change?

a)

chemical change

b)

physical change

98.

In a physical change, a new substance is formed.

a)

True

b)

False

99.

Baking a cake is an example of a physical change.

a)

True

b)

False

100.

Which of the following is an example of a physical change?

a)

a bike rusting

b)

toast burning

c)

butter melting

d)

food spoiling

101.

Which of the following examples is a physical change but NOT a change of state of matter?

a)

logs burning

b)

water freezing into ice cubes

c)

candle wax melting

d)

paper being cut

102.

Which of the following is an example of a chemical change?

a)

a penny tarnishing

b)

a mirror being scratched

c)

hair being cut

d)

water being boiled

103.

What is the best way to separate a mixture of sugar, sand, and water?

a)

Freeze the mixture, causing the water to be destroyed, then sift the sugar from the sand.

b)

Filter the sand from the sugar and water, then heat the mixture, causing the water to evaporate.

c)

Filter the mixture, causing the sugar and sand to get caught but not the water.

d)

Stir the mixture, causing the water to move above the sugar and sand.

104.

A student is investigating changes with common classroom materials. Which of the following BEST describes the conclusion the student can make about the investigations?

a)

The paperclip shows evidence of a physical change by changing the shape of the object, whereas the pencil eraser and hole puncher show evidence of a physical change by changing the size of the object.

b)

All three investigations show evidence of a physical change due to a change in the color of the original substance.

c)

The paperclip and hole puncher shows evidence of a physical change by changing the chemical properties of the original object, whereas the pencil eraser shows evidence of a physical change by changing the size of the object.

d)

All three investigations show evidence of a physical change due to a change in state of matter.

105.

Lighting a Match

a)

Physical Change

b)

Chemical Change

106.

Rusting Nail

a)

Physical Change

b)

Chemical Change

107.

Adding baking soda to vinegar

a)

Physical Change

b)

Chemical Change

108.
Which example best describes a physical change?
a)
baking a pie
b)
burning a candle
c)
making a paper airplane
d)
lighting a match
109.

a change that alters a substance without changing its chemical composition or its identity

a)

Chemical Change

b)

Physical Change

c)

Chemical and Physical Change

d)

Matter

110.
Is melting a physical or chemical change?
a)
physical
b)
chemical
c)
neither physical or chemical
d)
both physical and chemical
111.
Use the picture to determine if the object is going through a physical change or a chemical change.
a)
physical change
b)
chemical change
112.
What type of change is this?
a)
Physical Change
b)
Chemical Change
113.

Matter can change: the changes can be physical or chemical. When a physical change happens, nothing new is formed. During a physical change, matter changes form; it can be crushed or torn or change state. When a chemical change occurs, something new is formed. The reactant or reactants change and become something new. For example, a piece of iron can rust. The rust is the new substance that is formed. It is called iron oxide. How can you tell if a chemical change has taken place? There are certain observations you can make:1. temperature change2. color change3. gas or bubbles produced4. an odor is created5. combining two liquids forms a solid called a precipitate.

Ms. Brown asked her students to combine some regular cow's milk with white vinegar. Each group mixed 1 cup of warm milk with 4 tablespoons of vinegar in a glass measuring cup. After stirring the mixture, the students poured the liquids through a strainer into another beaker. The picture above shows the results of mixing warm milk with vinegar. What type of change is this? Explain.

a)

It is a chemical change because two liquids mixed together something new and different.

b)

It is a physical change because it is a mixture of two liquids.

c)

It is a chemical change because there was a change in temperature of the milk.

d)

It is a physical change because you can separate the parts with a strainer.

114.

Boiling or cooking an egg is a ________________________ change.

a)

reversible (physical) change

b)

irreversible (chemical) change

115.

Why does the rate of dissolving increase as the temperature increases?

a)

The solute molecules move faster at higher temperatures

b)

The solute particles become smaller at higher temperatures

c)

The solvent molecules become slower at higher temperatures

d)

What is the effect of agitation on the rate of dissolving?

116.

What is the effect of agitation on the rate of dissolving?

a)

 It decreases the rate of dissolving

b)

 It has no effect on the rate of dissolving

c)

It increases the rate of dissolving

d)

 It changes the color of the solute

117.

How does agitation help in dissolving a solute more quickly?

a)

It increases the temperature of the solvent

b)

 It increases the weight of the solute

c)

It brings fresh solvent into contact with undissolved solid

d)

It changes the shape of the solvent

118.

Why does a solute with a larger surface area dissolve faster?

a)

It has more solute surface area in contact with the solvent

b)

 It has fewer solute particles in contact with the solvent

c)

It has a higher temperature compared to other solutes

d)

It has a different color compared to other solutes

119.

What is the difference in dissolving time between a sugar cube and a teaspoon of granular sugar?

a)

The sugar cube dissolves faster

b)

The teaspoon of granular sugar dissolves faster

c)

Both dissolve at the same rate

d)

The dissolving time depends on the temperature of the solvent

120.

What can increase the rate of dissolving even further?

a)

Using a solute with a larger particle size

b)

Using a solute with a smaller particle size

c)

Decreasing the temperature of the solvent

d)

Decreasing the agitation of the mixture

121.

The finer the particles or the more surface area that is exposed, the slower the rate of dissolving.

a)

True

b)

False

122.

You want to make chocolate milk using Hershey's syrup. How could you speed up the rate of the syrup dissolving in your milk?

a)

Put the syrup in the fridge to cool before putting it in the milk

b)

Put the syrup in the milk and let it sit

c)

Increase the amount of syrup you put into the milk

d)

Warm up the syrup before putting it into the milk

123.

What combination would dissolve a solid solute the fastest?

a)

high temperature, no stirring

b)

no heat, no stirring

c)

sugar cube, no heat

d)

high temperature, stirring

124.
Which of the following statements is true about how using smaller salt crystals would affect the rate of making a salt solution in water?
a)
Smaller crystals increase the surface area and slow down dissolving.
b)
Smaller crystals decrease the surface area and speed up dissolving.
c)
Smaller crystals increase the surface area and speed up dissolving.
d)
Smaller crystals decrease the surface area and slow down dissolving.
125.

How does cold water affect the speed of dissolving?

a)

Cold water slows down dissolving.

b)

Cold water speeds up dissolving.

c)

Cold water has no effect on dissolving.

d)

Cold water has no effect on dissolving.

126.

John has three cups of sugar particles. Cup 1 has large sugar particles, Cup 2 has medium-sized particles, and Cup 3 has small sugar particles. If John pours each cup in water, which cup of sugar particles will dissolve the fastest?

a)

Cup 1 will dissolve the fastest.

b)

Cup 2 will dissolve the fastest.

c)

Cup 3 will dissolve the fastest.

d)

They will dissolve at the same rate.

127.
Look at the diagram. In this diagram, the red dots represent
a)
the solute
b)
the solvent
c)
the solution
128.
Look at the diagram. In this diagram, the blue area represents
a)
the solute
b)
the solvent
c)
the solution
129.

Which would dissolve faster?

a)

stirring sugar and water 30 times per minute

b)

stirring sugar and water 10 times per minute

130.

What is the rate of dissolving?

a)

How fast a solute dissolves in a solvent

b)

The amount of solute that can dissolve in a solvent

c)

The temperature at which a solute dissolves

d)

The size of the solute particles

131.

In a solution the _____ is dissolved.

a)

solvent

b)

solute

132.

Look at the solution of tea and water. What do you think the terms diluted or concentrated could mean?

a)

Diluted means more water, concentrated means less water

b)

Diluted means less water, concentrated means more water

c)

Diluted means more tea, concentrated means less tea

d)

Diluted means less tea, concentrated means more tea

133.

Which of the following actions increases the concentration of an aqueous solution?

a)

decreasing the amount of the solute (tea)

b)

increasing the amount of the solvent (water)

c)

increasing the amount of the solute (tea)

d)

increasing the solute (tea) and solvent (water) in equal amounts

134.

What is the rate of dissolution?

a)

how quickly a substance dissolves

b)

How cold a substance is

c)

How many particles are in a substance

d)

The color of the substance

135.

A saturated solution has reached its maximum _______ capacity.

a)

Solvent

b)

Solute

c)

Pressure

d)

Volume

136.

Rank the glasses from most concentrated to least concentrated.

a)

Glass D, Glass B, Glass A, Glass C

b)

Glass A, Glass B, Glass C, Glass D

c)

Glass D, Glass B, Glass C, Glass A

d)

Glass B, Glass D, Glass A, Glass C

137.

Which would NOT increase the rate of dissolution?

a)

Ice

b)

Heat

c)

Agitation

d)

Small Particle Size

138.

In an aqueous solution the ___________ is water.

a)

Solute

b)

Solvent

c)

Solution

139.

What is agitation?

a)

Heating

b)

Size

c)

Stirring

d)

Color

140.

The salt is the ________.

a)

Solute

b)

Solvent

c)

Solution

141.

Solvent OR Solution (Disolvente O Solución)?

a)

Solvent (Dosolvente)

b)

Solution (Solucion)

142.

Solvent OR Solution (Disolvente O Solución)? Sand and Water

a)

Solvent (Dosolvente)

b)

Solution (Solucion)

143.

Solvent OR Solution (Disolvente O Solución)?

a)

Solvent (Dosolvente)

b)

Solution (Solucion)

144.

Solvent OR Solution (Disolvente O Solución)?

a)

Solvent (Dosolvente)

b)

Solution (Solucion)

145.

Solvent OR Solution (Disolvente O Solución)?

a)

Solvent (Dosolvente)

b)

Solution (Solucion)

146.

Solvent OR Solution (Disolvente O Solución)?

a)

Solvent (Dosolvente)

b)

Solution (Solucion)

147.

Solvent OR Solution (Disolvente O Solución)?

a)

Solvent (Dosolvente)

b)

Solution (Solucion)

148.

contains only 1 type of atom

a)

element

b)

compound

c)

mixture

149.

contains 2 or more elements that are chemically combined

a)

element

b)

compound

c)

mixture

150.

contains 2 or more substances that are physically combined

a)

element

b)

compound

c)

mixture

151.

carbon dioxide, CO2, is an example of a(n)

a)

element

b)

compound

c)

mixture

152.

gold, Au, is an example of a(n)

a)

element

b)

compound

c)

mixture

153.

chlorine gas, Cl2, is an example of a(n)

a)

element

b)

compound

c)

mixture

154.

bronze, an alloy of many different metals, is an example of a( n)

a)

element

b)

compound

c)

mixture

155.

Kool-aid is a example of a(n)

a)

element

b)

compound

c)

mixture

156.

diagram "a" is an example of a(n)

a)

element

b)

compound

c)

mixture

157.

diagram "b" is an example of a(n)

a)

element

b)

compound

c)

mixture

158.

diagram "c" is an example of a(n)

a)

element

b)

compound

c)

mixture

159.

diagram "d" is an example of a(n)

a)

element

b)

compound

c)

mixture

160.

Element, mixture, or compound?

a)

element

b)

mixture

c)

compound

161.

Element, mixture, or compound?

a)

element

b)

mixture

c)

compound

162.

What do you see in this picture?

a)

A pure element

b)

A pure compound

c)

A mixture of two elements

d)

A mixture of two compounds

e)

A mixture of an element and a compound

163.

What do you see in this picture?

a)

A pure element

b)

A pure compound

c)

A mixture of two elements

d)

A mixture of two compounds

e)

A mixture of an element and a compound

164.
What is the chemical symbol for the element hydrogen
a)
H
b)
He
c)
h
d)
he
165.
What is the chemical symbol for the element Carbon
a)
ca
b)
co2
c)
C
d)
Cd
166.

Which is the best example of a pure substance?

a)

pizza

b)

gold

c)

saltwater

d)

air

167.

Which substance is a compound?

a)

copper

b)

magnesium

c)

saltwater

d)

water

168.

What kind of substance is composed of two or more elements that are chemically combined?

a)

element

b)

mixture

c)

solution

d)

compound

169.

A combination of substances that are not chemically combined is called a

a)

mixture

b)

compound

c)

element

170.

Earth’s air is made up of molecules of different gases that are not joined chemically. Which term best describes air?

a)

compound

b)

mixture

c)

pure substance

d)

element

171.

Structural differences between different chemicals can be represented in models of the particles. Which drawing BEST represents a compound?

a)

Picture A

b)

Picture B

c)

Picture C

d)

Picture D

172.

Is salt (NaCI) a compound or an element?

a)

Compound

b)

element

173.

What is the definition of a compound?

a)

The smallest part of any substance which can exist on its own

b)

Two or more atoms chemically joined together (can be the same or can be different)

c)

A simple substance in which all the atoms are identical

d)

Two or more different elements chemically joined together

174.
All matter is made of .....
a)
energy 
b)
atoms 
c)
air
d)
chemistry
175.

Which of the above figures is/are considered a mixture

a)

A. K only

b)

B. M only

c)

C. L and M only

d)

D. K, L and M

176.

Air is a ________ mixture in which different substances are _______ mixed.

a)

A. heterogeneous - evenly

b)

B. heterogeneous - not evenly

c)

C. homogeneous - not evenly

d)

D. homogeneous - evenly

177.

Which of diagram represents(s) an element?

a)

A. W only

b)

B. Z only

c)

C. X and Z only

d)

D. X, Y and Z only

178.

Matter is best described as anything that has _________________ only

a)

A. masse

b)

B. mass and velocity

c)

C. mass and takes up space

d)

D. mass, density and exerts pressure

179.

A pure substance

a)

elements

b)

mixtures

c)

compounds

d)

elements and compounds

e)

elements and mixtures

180.

identify the model

a)

element

b)

compound

c)

mixture of element

d)

mixture of compounds

e)

mixture of elements and compounds

181.

identify the model

a)

element

b)

compound

c)

mixture of elements

d)

mixture of compounds

e)

mixture of elements and compounds

182.
What is salad?
a)
element
b)
compound
c)
mixture
183.
This picture represents which of the following?
a)
Element
b)
Compound
c)
Mixture
184.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
185.

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

186.

What is the left part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Yields

b)

Products

c)

Chemical equation

d)

Reactants

187.

 

How many Mn atoms are found in the following compound?

2MnO4

a)

2

b)

4

c)

6

d)

8

188.

What is the little number after an element in a chemical equation called?

Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

189.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

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