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8th grade Sem 1 Review

Total questions: 92

Worksheet time: 2hrs 33mins

Name
Class
Date
1.
Blue Color: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
2.
Density: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
3.
Flammability (burns): Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
4.
Reacts with Acid: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
5.
Melting Point: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
6.
Boiling Point: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
7.
Odor: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
8.
Ability to rust is this type of property:
a)
Physical property
b)
Chemical property
9.
Physical properties are
a)
properties that can be observed without changing the identity of the substance
b)
properties that describe how a substance changes into a completely different substance
10.
which one is the definition of chemical property?
a)
a property or characteristic of a substance that is observed during a reaction where the chemical composition of a substance is changed
b)
any change that results in the formation of new chemical substances
c)
combustibility
11.
Is milk going sour a physical or chemical change?
a)
Physical 
b)
Chemical
12.

The ability to hammered into a thin sheet or be bent is

a)

Ductility

b)

Solubility

c)

Density

d)

Malleability

13.
Is sharpening a pencil a physical or chemical change?
a)
Physical 
b)
Chemical
14.

Glass breaking

a)

Physical Change

b)

Chemical Change

15.

A rusting bicycle

a)

Physical Change

b)

Chemical Change

16.

Melting butter for popcorn

a)

Physical Change

b)

Chemical Change

17.

Freezing chocolate-covered bananas

a)

Physical Change

b)

Chemical Change

18.

Separating sand from gravel

a)

Physical Change

b)

Chemical Change

19.

Spoiling food

a)

Physical Change

b)

Chemical Change

20.

Burning toast

a)

Physical Change

b)

Chemical Change

21.

Properties that can only be observed or measured by changing the CHEMICAL IDENTITY of a substance.

a)

chemical property

b)

physical property

c)

chemical change

d)

physical change

22.

A change in a substance that only affects its PHYSICAL PROPERTIES.

a)

chemical properties

b)

physical properties

c)

chemical changes

d)

physical changes

23.

Mass, volume, shape, size, color, luster, and hardness are all examples of

a)

chemical properties

b)

physical properties

c)

chemical changes

d)

physical changes

24.

A change in substance that affects its chemical properties thus a chemical reaction occurs and A NEW SUBSTANCE IS FORMED.

a)

chemical properties

b)

physical properties

c)

chemical changes

d)

physical changes

25.

Toxicity, flammability, combustibility, and radioactivity are examples of

a)

chemical properties

b)

physical properties

c)

chemical changes

d)

physical changes

26.

Reactivity is a

a)

chemical property

b)

physical property

27.

Viscosity is a

a)

chemical property

b)

physical property

28.

Solubility is a

a)

physical property

b)

chemical property

29.

Cutting, coloring, crushing, melting, boiling and molding (shaping something) are example of

a)

chemical changes

b)

physical changes

30.

Burning, rusting, cooking, and decomposing are examples of

a)

physical changes

b)

chemical changes

31.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
32.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
33.
A precipitate is a 
a)
liquid that forms when two solids are reacted
b)
a solid that forms when two liquids are mixed
c)
a gas that forms when vinegar and baking soda react
d)
a change of color in a solution
34.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
35.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
36.
Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?
a)
50 g
b)
100 g
c)
200 g
d)
400 g
37.

How many atoms do you have in the compound 2MgCl2?

a)

2 atoms

b)

4 atoms

c)

6 atoms

d)

8 atoms

38.

Law of conservation of mass states the amounts of atoms in the reactants and the products...

a)

Increase

b)

Decrease

c)

Stay the same

d)

No correct answer

39.

Does the equation H2+O2 →H2O follow the Law of Conservation of Mass?

a)

Yes, because the atoms are equal.

b)

No, because more info is needed.

c)

No, because there are more atoms in the product.

d)

No, because there are more atoms in the reactant.

40.

Solid carbon dioxide, commonly known as dry ice, changes from solid to vapor at room temperature. Predict the change in the motion of the carbon dioxide molecules while it changes state at room temperature.

a)

The molecules lose their energy and slide past each other.

b)

The energy of the molecules increases, but the spaces between them decrease.

c)

The molecules start vibrating in their positions with higher energy.

d)

The energy of the molecules and the spaces between them increase.

41.

Adding HEAT to matter causes its particles to:

a)

move faster and farther apart

b)

Move slower and farther apart

c)

Move faster and closer together

d)

Move slower and closer together

42.

Water puddles on a sidewalk evaporate when the Sun heats the water. Which of these BEST describes what is happening as the water evaporates?

a)

Water changes phase as it releases heat to the environment.

b)

Water boils as it absorbs energy from the sidewalk.

c)

Water becomes a gas as it absorbs energy from the Sun.

d)

Water evaporates as its thermal energy is transferred to the air.

43.

Raphael is studying the movement of water molecules as ice changes from a solid to liquid water. Which statement best describes the changes in the movement of the water molecules as heat causes the ice to melt?

a)

The molecules in the solid stay tightly connected and do not move. As heat is added, the molecules in the liquid move far apart and do not interact.

b)

The molecules in the solid move freely around one another and do not interact. As heat is added, the molecules are pushed closer together and begin to interact with one another.

c)

The molecules in the solid are in a rigid lattice and vibrate more rapidly. As the ice melts, the molecules in the liquid move more freely but are still attracted to each other and pack more tightly.

d)

The molecules in the solid are unmoving in a rigid lattice. As the ice melts, the molecules start to vibrate, and then release from the lattice structure, moving freely as they drift farther apart to form a liquid.

44.
At higher temperatures
a)
particles in an object have less energy
b)
particles in an object move faster
c)
a gas contracts
45.
Particles (molecules) in a ______________________ have more energy than the other states of matter.
a)
gas
b)
solid
c)
liquid
46.

Evidence of a chemical reaction is when 2 substances react, they

a)

stay the same

b)

form a new substance

c)

both

d)

none

47.

Your hands get cold outside from not wearing gloves

a)

exothermic

b)

endothermic

c)

both

d)

none

48.

Fire is an example of

a)

exothermic reaction

b)

endothermic reaction

c)

none

d)

both

49.

This is when heat is absorbed, it is an

a)

Exothermic reaction

b)

endothermic reaction

c)

both

d)

none

50.

When heat is released it is an

a)

exothermic reaction

b)

endothermic reaction

c)

both

d)

none

51.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
52.

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

a)

The temperature did not change.

b)

It is an endothermic reaction

c)

It is an exothermic reaction

d)

Energy is released from the reaction into the surrounding.

53.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
bubbles of gas appear
d)
dissolving
54.

The order of elements in the periodic table is based on

a)

the number of protons in the nucleus.

b)

the electric charge of the nucleus.

c)

the number of neutrons in the nucleus.

d)

atomic mass.

55.

Atoms of elements that are in the same group have the same number of

a)

protons.

b)

neutrons.

c)

valence electrons.

d)

protons and neutrons.

56.

The periodic table is organized in horizontal rows called...

a)

Groups

b)

Periods

c)

Families

d)

Chemical Symbols

57.

The vertical columns of the periodic table are called...

a)

Periods

b)

Families

c)

Chemical Symbols

d)

Groups

58.

Which of the following are physical properties of metal?

a)

Luster

b)

Conductivity

c)

Malleability

d)

Ductility

59.
What does the 1.00794 stand for?
a)
Hydrogen
b)
atomic number
c)
atomic mass
d)
atomic explosion
60.

The number of neutrons in an atom can be found by

a)

adding the number of neutrons and protons together.

b)

adding the atomic mass and the atomic number.

c)

subtratcting the atomic number from the atomic mass.

d)

subtracting the atomic mass from the atomic number.

61.
a)
12
b)
7
c)
8
d)
14
62.

USE THE PERIODIC TABLE

How many valence electrons does Phosphorus have?

a)

31

b)

5

c)

15

d)

4

63.
Elements in the same column of the periodic table always have the same # of _______ as one another.
a)
Protons
b)
Neutrons
c)
Electrons
d)
Valence Electrons
64.

The period that an element is in, tells you what?

a)

Number of protons

b)

Number of electrons

c)

Number of valence electrons

d)

Number of shells

65.

How many valence electrons does Helium Have?

a)

1 Valence electron

b)

2 Valence electron

c)

3 Valence electron

d)

4 Valence electron

e)

5 Valence electron

66.
Valence electrons are: 
a)
Electrons farthest away from the nucleus
b)
Electrons closest to the nucleus
c)
Electrons that just come and go - they don't stay with the atom
d)
Electrons in the second shell
67.

When trying to identify an unknown element, a scientist determines what other elements reacts with chemically. Which property of the unknown element determines the other element it reacts with?

a)

The total number of neutrons in the unknown element

b)

The total number of particles in the nucleus of the unknown element

c)

The number of protons in the nucleus of the unknown element

d)

The number of valence electrons in the unknown element

68.
Which of the following statements is not part of the cell theory?
a)
Cells are the basic unit of structure and function in all living things.
b)
All cells are produced from other cells.
c)
Only animal cells are composed of cells.
d)
All living things are composed of cells.
69.

When cells are damaged, new cells are created by cell a process called cell division. How does the cell theory support this fact?

a)

It states that all cells have a nucleus which divides.

b)

It states that all living things are made up of one or more cells.

c)

It states that cells come from previously existing cells.

d)

It states that the basic units of structure and function are cells.

70.
When you step out into the cold, your body shivers in order to keep its temperature at 98.6F.
a)
All living things use energy
b)
All living things contain cells
c)
All living things maintain homeostasis
d)
All living things grow
71.
A _____ is something in the environment that causes an organism to respond.
a)
stimulus
b)
response
c)
cause
d)
effect
72.
When a baby kitten becomes an adult cat, this is an example of...
a)
energy metabolism
b)
growth and development
c)
response to stimuli
d)
having cells
73.

The combination of chemical reactions through

which an organism builds up or breaks down

materials as it carries out its life processes is called ...

a)

absorption

b)

metabolism

c)

digestion

d)

consumption

74.

Maintaining a stable internal

environment is called

a)

homeostasis

b)

equilibrium

c)

balance

d)

evenness

75.

Identify the characteristic: when you step out into the cold, your body shivers in order to keep its temperature at 98.6oF.

a)

All living things use energy

b)

All living things contain cells

c)

All living things maintain homeostasis

d)

All living things grow and develop

76.
Pick the true statement about cellular organization:
a)
cells working together make tissues
b)
cells working together make organs
c)
tissues working together make organ systems
d)
organs working together make cells
77.

Which of the following is a response?

a)

a flashlight shined into the eye

b)

a rubber band popping your hand

c)

your pupils constricting when exposed to bright light

d)

blood glucose levels drop significantly

78.
Provides usable energy for other life functions
a)
growth
b)
cellular respiration
c)
digestion
d)
excretion
79.

What 3 things do plants need for the process of photosynthesis?

a)

Sunlight, oxygen and sugar.

b)

Water, soil and oxygen.

c)

Sunlight, carbon dioxide and water.

d)

Sunlight, soil and water.

80.
Why do plants conduct photosynthesis?
a)
To make light
b)
To make mitochondria
c)
To make glucose
d)
To release carbon dioxide
81.

Which organelle is responsible making food (Glucose) using sunlight?

a)

Cell Membrane

b)

Nucleus

c)

Chloroplast

d)

Mitochondria

82.
What gas goes into the plant before photosynthesis?
a)
Carbon Dioxide
b)
Carbon Monoxide
c)
Oxygen
d)
Nitrogen
83.

Look at the image. What are the products made by photosynthesis? PICK TWO.

a)

carbon dioxide

b)

oxygen

c)

glucose

d)

water

84.

What is the chemical equation for cellular respiration?

a)

6O2 + C6H12O6 --> 6CO2 + 6H2O

b)

6CO2 + C6H12O6 --> 6O2 + 6H2O

c)

6CO2 + 6H2O --> 6O2 + C6H12O6

d)

6O2 + 6H2O --> 6CO2 + C6H12O6

85.
The main source of energy for all life comes from ____.
a)
the Earth
b)
the moon
c)
the sun
d)
the food we eat/make
86.

Cellular Respiration's goal is to

a)

make water

b)

make energy

c)

make glucose

d)

make oxygen

87.
What gas is released into the air during cellular respiration?
a)
oxygen
b)
carbon dioxide
c)
water 
d)
glucose
88.

___ is the process that cells use to take energy from glucose.

a)

cellular respiration

b)

photosynthesis

c)

transpiration

d)

excretion

89.

The ___ is the cell part (organelle) inside cells where cellular respiration happens.

a)

mitochondria

b)

chloroplast

c)

nucleus

d)

ribosome

90.

Both ___ are leftover as waste products after cellular respiration.

a)

water & carbon dioxide

b)

oxygen & glucose

c)

carbon dioxide & oxygen

d)

water & oxygen

91.

Which of the following is the word equation for cellular respiration?

a)

glucose + oxygen ---> ATP + carbon dioxide + water

b)

carbon dioxide + water ---> ATP + glucose + oxygen

c)

glucose + water ---> ATP + carbon dioxide + oxygen

d)

glucose + carbon dioxide ---> ATP + oxygen + water

92.
What is the energy molecule?
a)
DNA
b)
ATP
c)
RNA
d)
AAA

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