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Chemistry Facts

Total questions: 200

Worksheet time: 3hrs 30mins

Name
Class
Date
1.

Typically, atoms are more stable when they are

a)

bonded together

b)

apart from each other

2.

Why do atoms bond?

a)

They typically don't bond

b)

To add or take away energy levels

c)

To have a full valance shell.

d)

To have a full inner shell

3.

Ionic bonding is between a

a)

nonmetal and nonmetal

b)

metal and nonmetal

c)

metal and metal

d)

Depends on the situation

4.

Covalent bonding is between a

a)

nonmetal and nonmetal

b)

metal and nonmetal

c)

metal and metal

d)

It depends on the situation

5.

What do atoms tend to do to become positive ions?

a)

lose electrons

b)

gain electrons

c)

lose protons

d)

gain protons

6.

What do atoms tend to do to become negative ions?

a)

lose electrons

b)

gain electrons

c)

lose protons

d)

gain protons

7.

What happens when magnesium loses 2 electrons?

a)

It stabilizes to a net charge of 0

b)

It turns into an atom

c)

It becomes negatively charged

d)

It becomes positively charged

8.

Predict the bond between Mg and Cl

a)

covalent

b)

ionic

c)

metallic

d)

none of the above

9.

What is the correct Lewis structure for BF3?

a)
b)
c)
d)

BF3 (The formula is the Lewis Structure)

10.

What is the chemical formula for Lithium Nitride?

a)

Li3N

b)

LiN3

c)

NLi3

d)

N3Li

11.

What is the ionic formula for a bond between Calcium and Phosphorus?

a)

Ca2P3

b)

Ca3P2

c)

Ca2P5

d)

P5Ca2

12.

What category of element usually forms a positive ion?

a)

Metals

b)

Nonmetals

c)

metalloids

d)

Noble gases

13.

The bond in CaCl2 is an example of

a)

Covalent

b)

Metallic

c)

Ionic

d)

Intermolecular Forces

14.

Which category of elements usually form negative ions?

a)

metals

b)

nonmetals

c)

metalloids

d)

noble gases

15.
At higher temperatures
a)
particles in an object have less energy
b)
particles in an object move faster
c)
a gas contracts
16.
A gas
a)
has a definite shape but no definite volume
b)
has a definite volume but no definite shape
c)
has fast-moving particles
17.

Freezing

a)

Solid to gas

b)

Liquid to solid

c)

Gas to solid

18.

Boiling

a)

liquid to gas

b)

gas to solid

c)

gas to liquid

19.
Which state of matter has a definite shape?
a)
solid
b)
liquid
c)
gas
20.

What is happening when my ice cream changes from a solid to a liquid?

a)

freezing

b)

melting

c)

burning

21.

The state of matter that has no definite size or shape is

a)

Solid

b)

Liquid

c)

Gas

22.

Particles in a ______________________ move quickly and are far apart.

a)

gas

b)

solid

c)

liquid

23.

Particles of a liquid

a)

are tightly packed together and stay in a fixed position.

b)

are free to move around one another but still touch.

24.

Solid to Gas

a)

Deposition

b)

Sublimation

c)

Evaporation

25.

What is condensation?

a)

gas to solid

b)

gas to liquid

c)

liquid to solid

26.

The slower the particles in a substance move,

a)

the colder it is.

b)

the warmer it is.

c)

the more energy it has.

27.

Is this a picture of something hot or cold?

a)

Hot

b)

Cold

28.

Is this a picture of something hot or cold?

a)

Hot

b)

Cold

29.
The temperature of a substance increases as___.
a)
the substance expands
b)
the average kinetic energy of its particles increases
c)
the substance's volume increases
d)
the substance's mass increases
30.

Definite shape and definite volume

a)

Solid

b)

Liquid

c)

Gas

31.

Has a definite volume but not a definite shape

a)

Solid

b)

Liquid

c)

Gas

32.

Liquid to Gas

a)

Condensation

b)

Evaporation

c)

Sublimation

33.

Complete the word equation below:

Acid + alkali --> ............... + water

a)

water

b)

salt

c)

gold

d)

metal

34.

.............................. + sodium hydroxide --> sodium chloride + water

a)

Nitric acid

b)

Sulphuric acid

c)

Hydrochloric acid

d)

Ethanoic acid

35.

Why is toothpaste alkaline?

a)

It can neutralise strong alkaline in

your mouth

b)

It can neutralise acid in

your mouth

c)

It can refresh your teeth

d)

Toothpaste is not alkaline.

36.
Pure water has a pH of 7. Pure water _______.
a)
is a base
b)
is a neutral substance
c)
could be either an acid or a base
d)
is an acid
37.

What colour is Universal indicator when the solution is neutral?

a)

Red

b)

Green

c)

Blue

d)

Purple

38.

What type of reaction occurs when you react an acid with an alkali?

a)

combustion

b)

decomposition

c)

no reaction

d)

neutralisation

39.

Sulphuric acid + potassium hydroxide --> ........................ + water

a)

potassium sulphate

b)

potassium sulphurate

c)

potassium nitrate

d)

magnesium hydroxide

40.

Lithium hydroxide + nitric acid ->

a)

Lithium nitrate + hydrogen

b)

Lithium nitride + salt

c)

Lithium nitrate + water

d)

Lithium nitrate + hydroxide

41.

ph range of acids are .....

a)

0-6

b)

7

c)

8-14

d)

4-10

42.

ph range of alkalis are .....

a)

0-6

b)

7

c)

8-14

d)

4-10

43.

Magnesium hydroxide + hydrochloric acid -> water + ..............

a)

magnesium chloride

b)

magnesium oxide

c)

magnesium oxygen

d)

magnesium chlorine

44.

sulphuric acid + lithium hydroxide -> water + .............

a)

sulphuric lithiate

b)

lithium sulphuric

c)

lithium sulphate

d)

sulphur lithate

45.

nitric acid + iron hydroxide -> iron nitrate + ..........

a)

hydrogen

b)

hydroxide

c)

oxygen

d)

water

46.

What colour change would you see if you added nitric acid to sodium hydroxide and universal indicator?

a)

red -> blue

b)

purple -> green

c)

red -> yellow

d)

pink -> colourless

47.

iron chloride, sodium nitrate, lithium sulphate, copper carbonate are all examples of .........

a)

acids

b)

alkalis

c)

salts

d)

mixtures

48.
Another term for burning is
a)
Fire triangle
b)
Magnesium oxide
c)
Combustion
d)
Bustion
49.

Combustion is when a __________ reacts with oxygen

a)

petrol

b)

fuel

c)

fire triangle

d)

carbon dioxide

50.

Glucose/sugar and oxygen are...

a)

products of cell respiration

b)

reactants of cell respiration

51.

Cells do cell respiration in order to make

a)

water

b)

glucose

c)

energy (ATP)

d)

oxygen

52.

Which two things are given out when something is burning?

a)

heat

b)

reflection

c)

light

d)

iron

53.

What two things does an iron object need to rust?

a)

paint

b)

oxygen

c)

water

d)

sugar

54.

What part of air is used in burning?

a)

nitrogen

b)

other gases

c)

carbon dioxide

d)

oxygen

55.

magnesium + oxygen --> magnesium oxide

If you started with 5g of magnesium and 2.5g of oxygen, what mass of magnesium oxide would be produced?

a)

5g

b)

2.5g

c)

7.5g

d)

10g

56.

What was the chemical name given to Rust ?

a)

Carbon

b)

Iron Oxide

c)

Iron Oxygen

d)

Magnesium Oxide

57.

Which diagram shows the most favourable conditions for rust to appear on the nail?

a)

A

b)

B

c)

C

d)

D

58.

What element rusts?

a)

carbon

b)

manganese

c)

iron

d)

potassium

59.

What prevents Rusting

a)

Painting , Oiling , Galvinising

b)

Washing with water

60.

Which of the following indicators cannot be stored in the laboratory for a longer period of time?

a)

Flower extract

b)

Methyl orange

c)

Phenolphthalein

d)

Litmus

61.

Which of the following is not an acid?

a)

Ammonia solution

b)

Ethanoic

c)

Methanoic

d)

Citrus

62.

Which of the following pH is strongly acidic?

a)

5.0

b)

14

c)

9.5

d)

1.0

63.

Which of the following has a pH of 14?

a)

Ammonia solution

b)

Distilled water

c)

Ethanoic acid

d)

Sodium hydroxide solution

64.

Give the products formed when Zinc reacts with Hydrochloric acid.

a)

Zinc and Hydrogen

b)

Zinc chloride and oxygen

c)

Zinc chloride and Hydrogen

d)

Zinc and salt

65.

Give the products formed when zinc reacts with Sulphuric (VI) acid.

a)

Salt + Water

b)

Zinc sulphate + Hydrogen

c)

Zinc + Hydrogen

d)

Zinc sulphate + Copper

66.

What are the products formed when aluminium reacts and Hydrochloric acid?

a)

Aluminium + water

b)

Aluminium + Oxygen

c)

Aluminium + Sulphate

d)

Aluminium chloride + Hydrogen gas

67.

What are the products formed when metal reacts with hydrochloric acid?

a)

Salt + Hydrogen

b)

Salt + water

c)

Salt + Oxygen

d)

Salt + Carbon (IV) oxide

68.

Which solution can turn phenolphthalein pink?

a)

Sodium hydroxide

b)

Vinegar

c)

Tomato

d)

Hydrochloric acid

69.

Which solution would turn litmus red?

a)

Potassium hydroxide

b)

Sodium chloride

c)

HNO3

d)

Ammonia

70.

Which solution would turn litmus blue?

a)

HCl

b)

Citric fruits

c)

H2SO3

d)

NH3

71.

Phenolphthalein has a pink color in a solution that has a pH of

a)

5

b)

11

c)

1

d)

7

72.

An unknown substance X gives brownish red stain on turmeric paper sheet. It also gives green colour in china rose solution. What is the nature of the substance?

a)

Acid

b)

Neutral

c)

Base

d)

Can't find with this data

73.

A solution Y is colourless when phenolphthalein was added to it. It didn't change its colour even on turmeric paper. It didnot change the colour of blue litmus paper too. What is the nature of the substance Y?

a)

Acid

b)

Neutral

c)

Base

d)

Can't find with this data

74.

What is the nature of the solution present in the beaker?

a)

Alkali

b)

Acidic

c)

Neutral

d)

Water

75.

Which of the set of pH paper depicts that the dipped solution is highly acidic?

(compare with the pH scale and find out)

a)
b)
c)
76.

Which type of solution is A and B respectively?

a)

Basic and acidic

b)

Acidic and basic

c)

Basic and neutral

d)

Acidic and neutral

77.

When china rose indicator is added to soap solution, What colour change would happen?

a)

Dark pink

b)

Light pink

c)

Green

d)

No colour change

78.

A homogeneous mixture is the same thing as...

a)

a solution

b)

a heterogeneous mixture

c)

a compound

d)

an element

79.

The prefix hetero means...

a)

same

b)

different

c)

together

d)

awesome

80.

A type of mixture that forms when one substance dissolves in another is known as a

a)

heterogeneous mixture

b)

solution

c)

solute

d)

solvent

81.
What does it mean to dilute a solution?
a)
lower the concentration of solute per solvent
b)
increase the concentration of solute per solvent
82.
What is a solvent
a)
the liquid in which a solute is dissolved to form a solution.
b)
Another word for solution
c)
A thing that make drinks turn colors
d)
Its a metal molecole
83.

How many grams are soluble in 100 g of water at 100 ºC?

a)

300 grams

b)

250 grams

c)

100 grams

d)

50 grams

84.

Which solute is most likely a gas?

a)

NH3

b)

NaNO3

c)

KCl

d)

NaCl

85.

When 40 grams of NaCl is dissolved in 100 grams of water at 90 ºC, the solution can be correctly described as:

a)

supersaturated

b)

saturated

c)

unsaturated

86.
Which solute does not increase in solubility as temperature rises?
a)
NH3
b)
NaNO3
c)
KNO3
d)
NaCl
87.
You can make a solution more concentrated by adding __________.
a)
solute
b)
solvent
c)
water
88.
Solution where more solute can still be dissolved at the given temperature. 
a)
Saturated
b)
Unsaturated
c)
Supersaturated
d)
Homogeneous solution
89.

Identify how many grams of KNO3 is required to make a saturated solution at 40'C.

a)

50 g

b)

45 g

c)

55 g

d)

33 g

90.

Water is considered polar due to:

a)

its neutral poles

b)

its charged poles

c)

the odd number of atoms involved

91.
If I dissolve sugar in water, what is the solute?
a)
Water
b)
Hydrogen
c)
Sugar
d)
Carbon
92.
What will allow more solute to be dissolved in a solvent.
a)
adding more solute
b)
stiring
c)
cooling solution
d)
heat
93.
Graph that shows the amount of solute that can be dissolved in 100 g of water at a certain temperature.
a)
Solubility curve
b)
Saturation curve
c)
Concentration curve
d)
Molarity curve
94.

You can make a solute dissolve more quickly in a solvent by

a)

adding more solute.

b)

adding ice.

c)

heating the solvent.

d)

removing some solvent.

95.

A solution that contains all of the solute it can hold at a given temperature is

a)

diluted.

b)

saturated.

c)

supersaturated.

d)

unsaturated.

96.

Three 10 g samples of sugar are represented below.


Sample A dissolves in water more slowly than sample B.

Sample B dissolves more slowly than sample C.

Which of the following best explains why sample A dissolves more slowly than the other two?

a)

It has the most volume.

b)

It has the smallest surface area.

c)

It has the largest number of sugar molecules.

d)

It has the fewest bonds between sugar modules.

97.
What is Solubility? 
a)
What is dissolved 
b)
What does the dissolving
c)
A measure of how much solute can dissolve in solvent 
d)
a charged ion 
98.
Oil molecules are nonpolar. What kind of solvent is required to remove an oil stain?
a)
saturated
b)
unsaturated
c)
polar
d)
nonpolar
99.
The "like dissolves like" rule is the reason why water cannot dissolve
a)
salt
b)
sugar
c)
vinegar
d)
oil
100.

Based on the solubility curve, how many grams of sugar will dissolve in a 100 mL of water at 20°C?

a)

100 g

b)

150 g

c)

200 g

d)

250 g

101.

Sugar dissolved in water is an example of a

a)

Homogeneous Mixture

b)

Heterogeneous Mixture

102.

How can you create a supersaturated solutions?

a)

Dissolve lots of solvent in the solute

b)

Dissolve a little solute in the solvent

c)

Dissolve more solute in the solvent than you should be able to

d)

Dissolve a super amount of solvent in the solute

103.

Water is known as

a)

the universal solute

b)

something you drink to stay young

c)

the universal solvent

d)

something you drink to get old

104.

At approximately what temperature does the solubility of sodium chloride, NaCl, match the solubility of potassium dichromate, K2Cr2O7?

a)

60 ºC

b)

30 ºC

c)

50 ºC

d)

83 ºC

105.
How many grams of K2Cr2O7, are soluble in 100 g of water at 95 ºC?
a)
83 grams
b)
75 grams
c)
40 grams
d)
12 grams
106.
The amount of solute actually dissolved in a given amount of solvent.
a)
dilution
b)
concentration
c)
saturated solution
d)
supersaturated mixture
107.

Which substance is MOST soluble at 90 ºC?

a)

Solid A

b)

Solid B

c)

Solid C

108.

A ___________________ solution is one in which there is a large amount of solute in a small amount of solvent.

a)

dilute

b)

concentrated

c)

suspension

d)

crystal

e)

solubility

109.

A solubility curve shows how solubility changes with temperature; more copper sulfate dissolves at _________________

a)

a higher temperature

b)

a lower temperature

c)

temperature doesn't matter, just need to stir it more

110.

The solubility of a substance is the mass of it (in grams) that will dissolve ...

a)

in 100g of solvent at a fixed temperature

b)

a saturated solution

c)

and form a solubility curve for crystals

111.

A solubility curve is a graph showing ...

a)

how solubility is directly proportional to temperature.

b)

how solubility depends on volume.

c)

how the solubility of a substance varies with temperature.

112.

How many grams of K2Cr2O7, are soluble in 100 g of water at 95 ºC?

a)

83 grams

b)

75 grams

c)

40 grams

d)

12 grams

113.

Which substance is MOST soluble at 0 ºC?

a)

KI

b)

NaNO3

c)

NaCl

d)

Ce2(SO4)3

114.
When 20 grams of potassium chlorate, KClO3, is dissolved in 100 grams of water at 80 ºC, the solution can be correctly described as:
a)
supersaturated
b)
saturated
c)
unsaturated
115.
When 20 grams of KNO3 is dissolved in 100 grams of water at 80 ºC, the solution can be correctly described as:
a)
supersaturated
b)
saturated
c)
unsaturated
116.
When 50 grams of KCl is dissolved in 100 grams of water at 50 ºC, the solution can be correctly described as:
a)
supersaturated
b)
unsaturated
c)
saturated
117.

When 42 grams of potassium chloride ( KCl), is dissolved in 100 grams of water at 50 ºC, the solution can be correctly described as:

a)

supersaturated

b)

saturated

c)

unsaturated

118.

How many grams of CaCl2, are soluble in 100 g of water at approximately 17 ºC?

a)

58 grams

b)

70 grams

c)

0 grams

d)

12 grams

119.

In a solution, the part of the mixture in which other substance are dissolved

a)

Strainer

b)

Solvent

c)

Solute

d)

Magnetism

120.

The substance which dissolved in the solvent

a)

Dissolve

b)

Solubility

c)

Solvent

d)

Solute

121.
Which of these solutes does not increase in solubility as temperature rises?
a)
NH3
b)
NaNO3
c)
KNO3
d)
NaCl
122.
What causes winds to form on Earth?
a)
solar energy
b)
ocean currents
c)
elevation differences
d)
uneven heating of the Earth by the sun
123.
A student states the weather is the same as the climate. Which response BEST tells the student the difference between weather and climate?
a)
Weather is about the wind and the rain, but climate is about the clouds.
b)
Weather is the conditions in one day, but climate is the conditions over a long time.
c)
Weather is measured with tools like thermometers, but climate is measured with tools like forecasts.
d)
Weather is recorded on charts, but climate is recorded on world maps.
124.
Which observation describes a change in climate rather than a change in weather?
a)
The thunderstorm dropped about three centimeters of rain today.
b)
The average summer temperatures have increased over the last ten years.
c)
 The snowfall in this area was more this week than it was last week.
d)
The average wind speed in April was less than it was in March.
125.
Which statement about Hawaii refers to its climate?
a)
A blizzard occurs on one of Hawaii’s tallest mountain peaks.
b)
A high temperature of 37.8°C was recorded earlier today in Hawaii.
c)
The mountains were shaded by cumulus clouds on a Tuesday afternoon.
d)
The coolest months are February and March.
126.
Two major factors used to identify climate are?
a)
longitude and latitude
b)
temperature and precipitation
c)
lattitude and temperature
d)
layers in the atmosphere
127.
Weather refers to the conditions of Earth’s atmosphere at a particular ____________. 
a)
 Location
b)
Time
c)
Place
d)
 Time and Place
128.
This is the symbol for a... 
a)
Cold Front
b)
Warm Front
c)
Stationary Front
d)
Occluded Front 
129.
This is the symbol for a... 
a)
Occluded Front
b)
Stationary Front
c)
Warm Front
d)
Cold Front 
130.
Identify the type of front that is shown in the image.
a)
Occluded Front
b)
Cold Front
c)
Stationary Front
d)
Warm Front
131.
Identify the type of front that is shown in the image.
a)
Occluded Front
b)
Cold Front
c)
Stationary Front
d)
Warm Front
132.
Identify the type of front that is shown in the image.
a)
Occluded Front 
b)
Cold Front
c)
Stationary Front
d)
Warm Front
133.
Located at the leading edge of a temperature drop off. Bring heavy thunderstorms, rain, and hail. Cool, fair weather is likely to follow.  
a)
Warm Front
b)
Cold Front
c)
Occluded Front
d)
Stationary Front 
134.
Located at the leading edge of a warm air mass. Brings gentle rain or light snow, followed by warmer, milder weather.  
a)
Warm Front
b)
Cold Front 
c)
Occluded Front 
d)
Stationary Front 
135.
Find the IV:  You experiment to find out if you can blow bigger bubbles when it is hot outside or when it is cold outside.
a)
bubble blowing technique
b)
Type of bubble juice
c)
Size of bubbles
d)
Temperature
136.
Find the DV:  You experiment to find out if you can blow bigger bubbles when it is hot outside or when it is cold outside.
a)
bubble blowing technique
b)
Type of bubble juice
c)
Size of bubbles
d)
Temperature
137.

Weather describes the state (condition) of the atmosphere.

It might be sunny, hot, raining, etc.

a)

True

b)

False

138.

Weather is based on the average climate experienced in a location over

a long period of time – 30 years or more.

a)

true

b)

false

139.

Belarus has a ....................climate with four distinct seasons

a)

humid subtropical

b)

marine

c)

humid continental

140.

The difference between climate and weather is....

a)

Measure in time

b)

Area

c)

I don't know

d)

Temperature

141.

Snow, Rain, Sleet, and Hail represent...

a)

pressure

b)

temperature

c)

precipitation

d)

humidity

142.

Water vapor in the air is also known as

a)

precipitation

b)

condensation

c)

humidity

143.

Lack of water in the desert.

a)

drought

b)

blizzard

c)

flood

d)

heatwave

144.

The sound you hear after a lightning.

a)

thunderstorm

b)

lightning

c)

thunder

d)

extreme

145.

A snowy storm.

a)

drought

b)

thunder

c)

blizzard

d)

lightning

146.

small balls of ice that fall like rain

a)

ice storm

b)

icying

c)

hail

d)

freeze

147.

when everything becomes covered with water

a)

drought

b)

avalanche

c)

hoar frost

d)

flood

148.

Which of the following is NOT a type of extreme weather?

a)

Tornado

b)

Sleet

c)

Hurricane

d)

Drought

149.

Precipitation which falls as rain and then

freezes when it hits objects and surfaces on the ground,

whose temperature is below freezing (below zero)

a)

hurricane

b)

freezing rain

c)

hurricane

d)

tornado

150.
A rock formed from fragments of other rocks is a(n)
a)
Metamorphic Rock
b)
Sedimentary Rock
c)
Extrusive Rock
d)
Igneous Rock
151.
An igneous rock containing large crystals is most likely a(n)
a)
Chemical Rock
b)
Foliated Rock
c)
Extrusive Rock
d)
Intrusive Rock
152.
A metamorphic rock in which the grains line up in parallel bands is a
a)
Clastic Rock
b)
Nonclastic Rock
c)
Nonfoliated Rock
d)
Foliated Rock
153.
If heat and pressure inside the Earth cause a rock to melt, the material that formed would be
a)
Metamorphic
b)
Magma
c)
Sedimentary
d)
Igneous
154.
You find a rock in which the grains are arranged in parallel bands of white and black crystals.  The rock is probably a(n)
a)
Igneous rock
b)
Sedimentary rock
c)
Metamorphic rock
d)
Extrusive rock
155.
As lava cools and crystallizes, what type of rock will form?
a)
Sedimentary
b)
Metamorphic
c)
Extrusive Igneous
d)
Intrusive Igneous
156.
The parent rock of Gneiss is
a)
Marble
b)
Granite
c)
Obsidian
d)
Biotite
157.
When minerals line up in bands within a metamorphic rock, this rock is...
a)
Nonfoliated
b)
Foliated
c)
Igneous
d)
Sedimentary
158.
Which of the following is not a rock
a)
Pumice
b)
Lava
c)
Halite
d)
Sandstone
159.
The three groups of rocks are classified by
a)
How they form
b)
Color
c)
Grain size
d)
Chemical Composition
160.
The igneous rock texture that is characterized by two distinctly different crystal sizes is called
a)
Coarse grained
b)
Fine grained
c)
Glassy
d)
Porphyritic
161.
Fossils are only found in
a)
Sedimentary rocks
b)
Foliated Metamorphic rocks
c)
Igneous Rocks
d)
Nonfoliated Metamorphic rocks
162.

What type of a reaction is the following?

HNO3 + KOH --> KNO3 +H2O

a)

endothermic and decomposition

b)

Exothermic and single displacement

c)

Exothermic and neutralisation

d)

Endothermic and neutralisation

163.

the following diagram shows the energy profile for the reaction between sodium hydrogen carbonate (NaHCO3) and Hydrochloric acid.

find the correct relationship between the type of the reaction and statement about energy of reactants and products.

a)

endothermic - products have more energy than the reactants

b)

exothermic - products have less energy than the reactants

c)

exothermic-products have more energy than the reactants

d)

endothermic - products have less energy than the reactants

164.

what is the WRONG statement regarding the following energy profile?

a)

Energy is given out during the reaction.

b)

The products are at a lower energy level than the reactants.

c)

The reaction is endothermic.

d)

D The temperature increases during the reaction.

165.

Which reaction is endothermic?

a)

acid neutralising alkali causing a temperature increase

b)

adding magnesium to hydrochloric acid

c)

calcium carbonate decomposing when heated

d)

combustion of fossil fuels

166.

A metal reacts with an aqueous solution. The graph shows the temperature before, during and after the reaction.

which answer describes the reaction

a)

combustion -exothermic

b)

combustion-endothermic

c)

thermal decomposition -endothermic

d)

thermal decomposition -exothermic

167.

which reaction is endothermic?/

a)

A

b)

B

c)

C

d)

D

168.

Which statements about exothermic and endothermic reactions are correct?

1 During an exothermic reaction, heat is given out.

2.The temperature of an endothermic reaction goes up because heat is taken in.

3.Burning methane in the air is an exothermic reaction.

a)

All

b)

1 and 2 only

c)

1 and 3 only

d)

2 and 3 only

169.

Solutions of two chemicals are mixed. A reaction occurs and the temperature change is measured. Which statement is correct?

a)

If the reaction is endothermic, the temperature decreases and energy is taken in.

b)

If the reaction is endothermic, the temperature increases and energy is given out.

c)

If the reaction is exothermic, the temperature decreases and energy is given out.

d)

If the reaction is exothermic, the temperature increases and energy is taken in.

170.

Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. What would show that the process was exothermic?

a)

A blue solution is formed.

b)

The beaker feels cooler.

c)

The beaker feels warmer.

d)

The powder dissolves in the water.

171.

A diagram for the energy change during an exothermic reaction is shown.

For which reactions would this be an appropriate diagram?

1. CH4 + 2O2 → CO2 + 2H2O

2. 2H2 + O2 → 2H2O

3. C + O2 → CO2

a)

1 and 2

b)

2 and 3

c)

1 and 3

d)

All

172.
The physical separation of mixtures into individual components is..
a)
chromatography
b)
opacity 
c)
latent
d)
trace evidence 
173.
Two or more substances that are mixed together but not chemically combined is a ___
a)
compound
b)
mixture
c)
keratin
d)
chromatography
174.
Two or more substances that are chemically combined is a ___
a)
compound
b)
mixture
c)
solvent
d)
solute
175.

Ink can be separated by a method of -----------------------------------------------

a)

distillation

b)

filtration

c)

chromatography

d)

sedimentation

176.
chromatography separates the mixture of dyes on the basis of their ----------------------------
a)
density
b)
solubility
c)
gravity
d)
boiling point
177.
On the chromatogram given -------------- is mixture.
a)
red
b)
orange
c)
green
d)
black
178.
A pure substance shows ------------------ spot on chromat gram
a)
0
b)
1
c)
2
d)
3
179.
Dyes in water soluble markers may be separated by means of..
a)
crystallization
b)
sublimation
c)
chromatography
d)
sedimentation
180.
A student extracts the colour from some green smarties and uses paper chromatography to separate components colours. She finds blue has a Rf =0.38 and yellow Rf =0.75 this suggests 
a)
the yellow is more strongly adsorbed onto the stationary phase and is less solublein the mobile phase.
b)
the yellow is more strongly adsorbed onto the stationary phase and is more soluble in the mobile phase.
c)
the blue is more strongly adsorbed onto the stationary phase and is less solublein the mobile phase.
d)
the blue is more strongly adsorbed onto the stationary phase and is less solublein the mobile phase.
181.
A high Rf value indicates strong
a)
strong affinity to the stationary phase
b)
strong affinity to the mobile phase
c)
no affinity to the stationary phase
d)
 no affinity to the stationary phase
182.
The Rf value  for the blue component is 
a)
0.3
b)
0.7
c)
10
d)
3
183.
The Rf value  for the red component is 
a)
0.3
b)
0.7
c)
10
d)
7
184.
Which plant species has plant pigments most similar to those in A?
a)
B
b)
C
c)
D
185.

What is chromatography?

a)

A way to see pretty colors

b)

A laboratory technique used to separate a mixture.

c)

A form of distillation

186.
Why must the base line be drawn in pencil and not pen?
a)
a) Pencil is good at keeping substances in place.
b)
b) Pencil is soluble in water
c)
c) Pencil is insoluble in water
d)
d) Pencil is not coloured
187.

In paper chromatography, the LEAST soluble solute ____.

a)

does not move from the start point

b)

stays closest to the start point

c)

travels furthest away from the start point

d)

can be found in the middle of the chromatogram

188.
In chromatography, if a solute does not separate and remains on the start line ....
a)
the solute is insoluble in the solvent
b)
the solute is soluble in the solvent
c)
the solvent is insoluble in the solute
d)
the solvent is soluble in the solute
189.
Whose blood was found at the crime scene?
a)
John
b)
Lisa
c)
Bob
d)
Sure
190.

Here is chromatography of markers with the paper placed in water. What is true.

a)

Blue dissolves best in water.

b)

Yellow dissolves best in water.

c)

Green dissolves best in water.

d)

Pink dissolves best in water

191.

To separate a mixture of salt and water what separation method is used?

a)

Filtration

b)

Distillation

c)

Chromatography

d)

Evaporation to dryness

192.

What is the method suitable to obtain pure water from seawater.

a)

Simple distillation

b)

Fractional distillation

c)

Filtration

d)

Evaporation to dryness

193.

What is the separation technique for which this lab instrument is needed?

a)

sieving

b)

decanting

c)

filtering

d)

magnetic separation

194.

How would you separate the substances shown in the picture (oil and water)?

a)

by sieving

b)

by decanting

c)

by distillation

d)

by filtering

195.
Which one of the following is the name for separation technique in the picture below
a)
distillation
b)
dissolving
c)
evaporation
d)
decanting
196.
Which one of the following is a disadvantage of evaporation?
a)
It always requires heat
b)
It cannot be used for insoluble solids
c)
All of the solute is recovered
d)
The solvent (liquid part) is not recovered
197.
Evaporation is a process that removes a...
a)
solvent (liquid part of solution)
b)
solute (material that dissolves in the solvent)
c)
distillate (liquid collected after a solution is distilled)
d)
impurity
198.
The drops of water that appear on the outside of a glass of cold water on a warm day are an example of?
a)
sublimation
b)
condensation
c)
evaporation
199.

Name the separation technique

a)

Filtration

b)

Evaporation

c)

Centrifuge

d)

Distillation

200.
Name the separation method that causes wet clothes on a clothes line to dry
a)
Chromatography
b)
Filtration
c)
Distillation
d)
Evaporation

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