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Semester 1 Final

Total questions: 86

Worksheet time: 43mins

Name
Class
Date
1.

Molecules are made of

a)

Cells

b)

Waves

c)

Atoms in different amounts

d)

Compounds in different amounts

2.

The center of an atom is called the

a)

Center

b)

Nucleus

c)

Electron

d)

Mass

3.

The Bohr model shows that

a)

Electrons are inside the atom.

b)

Protons orbit the nucleus.

c)

Electrons orbit in different energy levels.

d)

Electrons do not move.

4.

AMU stands for?

a)

Atomic Mass Units

b)

Atomic Moving Usable Energy

c)

Always Mind Unstable

d)

Astronomic Metric Units

5.

The mass of an atom is

a)

The mass of protons and electrons added together

b)

The mass of neutrons and electrons added together

c)

The mass of neutrons and protons added together

d)

None of these.

6.

The smallest part of an element is

a)

Atom

b)

Compound

c)

Periodic table

d)

None of these

7.

What is the basic unit of all matter?

a)

Nucleus

b)

Compound

c)

Element

d)

Atom

8.

The Periodic Table of Elements

a)

Lists only elements we can see and touch

b)

Lists all elements that make up matter

c)

Does not list metals

d)

Does not list gases

9.

Molecules are formed when what join together?

a)

Molecules

b)

Compounds

c)

Substances

d)

Atoms

10.

An element is made of

a)

Many types of atoms

b)

Many types of molecules

c)

At least two types of atoms

d)

One type of atom

11.

The properties of matter

a)

Can never change

b)

Depend on composition and arrangement of atoms

c)

Are the same

d)

None of these

12.

Show the model of CO2\mathrm{CO_2}

a)

One carbon atom bonded to two oxygen atoms

b)

Two carbon atoms bonded to one oxygen atom

c)

One carbon atom bonded to one oxygen atom

d)

Two hydrogen atoms bonded to one oxygen atom

13.

Which model shows H2O\mathrm{H_2O} ?

a)

Two hydrogen atoms bonded to one oxygen atom

b)

One hydrogen atom bonded to two oxygen atoms

c)

Two carbon atoms bonded to one oxygen atom

d)

One hydrogen atom bonded to one oxygen atom

14.

Why do scientists use models to understand molecules?

a)

Because molecules are too small to see and models help explain their structure

b)

Because models replace experiments

c)

Because models are exact copies of molecules

d)

Because atoms and molecules do not exist

15.

Choose the best answer. What are signs of a chemical reaction?

a)

gas production

b)

cannot easily be reversed

c)

color change

d)

odor

e)

all of the above

16.

Choose the best answer. Change in state of matter is

a)

a chemical change

b)

a physical change

c)

a permanent change

d)

unchangeable

17.

Choose the best answer. The ingredients in a chemical reaction are called

a)

products

b)

ingredients

c)

reactants

d)

samples

18.

Choose the best answer. When using chemicals in a lab, you should

a)

wear gloves

b)

wear safety goggles

c)

follow directions

d)

waft instead of inhaling deeply

e)

all of the above

19.

Choose the best answer. Which of these is a chemical reaction?

a)

metal rusting

b)

breaking down of food in your digestive system

c)

photosynthesis

d)

all of the above

20.

What is the substance formed in a chemical reaction called?

a)

reactant

b)

product

c)

resultant

d)

summation

21.

When observing a reaction between two substances, you should look at

a)

Only the product

b)

The properties of the ingredients

c)

The properties before and after

d)

None of the above

22.

Which type of reaction is AB → A + B?

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Combustion

23.

In which type of reaction are carbon dioxide and water always produced?

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Combustion

24.

Choose the best answer. A chemical equation

a)

Is a symbolic representation of a chemical reaction

b)

Is a symbolic representation of a physical change

c)

Only shows the reactants

d)

Uses an equal sign = to indicate the result

25.

Choose the best answer. In a chemical reaction, a solid product is called

a)

A solid product

b)

A hard product

c)

A precipitate

d)

combustion

26.

Choose the best answer. Chemical reactions are

a)

Rare and only seen in a lab

b)

Always explosive and dramatic

c)

Dangerous

d)

Occurring in everyday life, like cooking

27.

Choose the best answer. When a compound breaks down into two or more substances,

a)

It is a decomposition reaction

b)

It is a combustion reaction

c)

It is a physical change

d)

It is a coefficient

28.

Choose the best answer. One difference between a physical change and a chemical change is

a)

A chemical change creates a new substance with different chemical properties

b)

How long they last

c)

One will explode and the other will not

d)

Physical changes cannot be reversed

29.

The Law of Conservation of Mass means

a)

Mass = chemical reaction + 5

b)

The total number of atoms does not change after a chemical reaction, so mass is conserved

c)

The structure of molecules stays the same between reactants and products

d)

Mass changes after a chemical reaction

30.

What happens to the weight when you combine two substances?

a)

The combined weight is greater than each individual substance

b)

The combined weight is the same as the sum of the two substances

c)

The combined weight decreases

d)

The combined weight increases

31.

What happens when two substances react chemically?

a)

The state changes from solid to liquid

b)

The weight increases

c)

A new substance is formed

d)

The weight decreases

32.

The total weight of matter is conserved when substances are heated, cooled, or mixed.

a)

True

b)

False

33.

Matter is conserved in a chemical reaction because

a)

Mass is conserved

b)

The total number of atoms in the products equals the reactants

c)

We can count the atoms before and after a reaction

d)

We can model that matter is conserved

e)

All of the above

34.

Look at this equation: H2+O2=H2OH_2 + O_2 = H_2O

a)

Mass is not conserved

b)

Mass is conserved. The atoms are just rearranged in the product

c)

We cannot tell by looking at this equation

35.

A form of energy that travels through space and includes visible light, radio waves, and x-rays.

a)

Seismic wave

b)

Mechanical wave

c)

Electromagnetic wave

d)

Amplitude wave

36.

How does the diameter of a water ripple relate to its amplitude?

a)

A larger diameter means a larger amplitude

b)

A larger diameter means a smaller amplitude

37.

The number of waves passing a point in one second.

a)

Amplitude

b)

Friction

c)

Crest

d)

Frequency

38.

Energy that moves through matter, like sound waves, is called a _______.

a)

Mechanical wave

b)

Longitudinal wave

c)

Refraction wave

d)

Rarefaction wave

39.

The material a wave travels through is called?

a)

Frequency

b)

Absorption

c)

Medium

d)

Amplitude

40.

What is the lowest part of a wave?

a)

Crest

b)

Amplitude

c)

Wavelength

d)

Trough

41.

What does a wave transfer?

a)

Matter

b)

Energy

c)

Friction

d)

Water

42.

A wavelength is the distance between two crests.

a)

True

b)

False

43.

When particles move parallel to energy transport, it is a ________ wave.

a)

Longitudinal

b)

Transverse

c)

Reflective

d)

High-frequency

44.

When energy moves in a direction perpendicular to the wave's travel, the wave is ________.

a)

Longitudinal

b)

Transverse

c)

Reflective

d)

High-frequency

45.

Two waves are identical except Wave A has a greater amplitude than Wave B. What does this mean?

a)

The wave with the greater amplitude will carry more energy

b)

The wave with the lower amplitude will carry more energy

c)

Wave A and Wave B will carry the same amount of energy

d)

Amplitude is not related to the wave’s energy

46.

Which wave has both longitudinal and transverse properties?

a)

Sound waves underwater

b)

Ocean waves

c)

Light waves

d)

Heat waves

47.

In which medium does sound travel the fastest?

a)

Solid

b)

Liquid

c)

Gas

48.

Loud sound means low amplitude.

a)

True

b)

False

49.

Label the parts of the wave: crest, trough, amplitude, wavelength. Based on the diagram, which term names the highest point of the wave?

a)

Crest

b)

Trough

c)

Amplitude

d)

Wavelength

50.

Label the parts of the wave: crest, trough, amplitude, wavelength. Based on the diagram, which term names the lowest point of the wave?

a)

Crest

b)

Trough

c)

Amplitude

d)

Wavelength

51.

Label the parts of the wave: crest, trough, amplitude, wavelength. Based on the diagram, which term names the maximum displacement from the midline?

a)

Crest

b)

Trough

c)

Amplitude

d)

Wavelength

52.

Label the parts of the wave: crest, trough, amplitude, wavelength. Based on the diagram, which term names the distance between consecutive crests?

a)

Crest

b)

Trough

c)

Amplitude

d)

Wavelength

53.

A wave has a wavelength of 12 meters and a frequency of 10 Hz. What is its velocity?

a)

V = 3 × 15 = 45 m/s

b)

V = 12 × 10 = 120 m/s

c)

1200 m/s

d)

12000 m/s

54.

Which statement is true? (Refer to the labeled samples.)

a)

Sample a is a transverse wave and sample b is a longitudinal wave

b)

Sample a is a longitudinal wave and sample b is a transverse wave

c)

Sample a and b only occur in electromagnetic waves

55.

You have two sounds: a bird chirping and a siren blaring. Which would have a higher amplitude?

a)

Siren

b)

Bird

c)

Both

d)

Neither

56.

What does a wave transfer?

a)

Matter

b)

Energy

c)

Friction

d)

Water

57.

When a wave’s energy is transferred to an object, rather than being transmitted through it or reflected by it, it is ____________.

a)

Reflected

b)

Transmitted

c)

Absorbed

d)

Refracted

58.

Which wave will lose more energy in absorption? (Refer to the diagrams.)

a)

High-frequency wave

b)

Low-frequency wave

59.

When electromagnetic waves are absorbed by an object, what happens?

a)

Nothing

b)

The object moves

c)

The object stops moving

d)

The object become warmer

60.

When a wave bounces off a surface and moves in a different direction it is called ________.

a)

Refraction

b)

Reflection

c)

Absorption

d)

Transmission

61.

The wave traveling from the left encountered a medium boundary. What happened at the boundary?

a)

The transmitted part of the wave carried particles from one medium to another

b)

The wave carried matter though the medium barrier

c)

Part of the wave was reflected back into the original medium

d)

The wave was entirely absorbed by the medium

62.

An optical illusion that makes a straw in water appear to be bent or broken is caused by __________?

a)

Reflection

b)

Absorption

c)

Refraction

d)

Transmission

63.

Which color roof might help keep your house a little warmer?

a)

Black because it absorbs

b)

White because it absorbs

c)

The color will make no difference

64.

Light shining through a glass window to provide natural sunlight in a house is an example of __________?

a)

Absorption

b)

Refraction

c)

Reflection

d)

Transmission

65.

When you look at a lake and it looks shiny, what is this an example of?

a)

Reflection

b)

Absorption

c)

Refraction

d)

Transmission

66.

Objects or substances that absorb any wavelength of electromagnetic radiation become warmer and ________.

a)

Produce a gas

b)

Convert the absorbed energy to infrared radiation

c)

Convert the absorbed energy into chemical energy

d)

Reflect back twice as much energy

67.

When light hits a red wagon, some of the energy is absorbed and __________.

a)

Red light is reflected

b)

Red light is absorbed

c)

Blue light is reflected

d)

All light is absorbed

68.

Which of these materials insulates from thermal energy?

a)

Styrofoam

b)

Thick Fabric

c)

Foil

d)

All of these

69.

If you were building a thermos to keep liquid warm, what type of materials would you look for?

a)

Insulators

b)

Conductors

c)

Liquid

d)

None of these

70.

What do you call the device you design that you are testing?

a)

Device thing

b)

Sample One

c)

The Prototype

d)

The exhibit

71.

Why do you have a control when you plan an investigation?

a)

So that you will know who won the race

b)

To minimize the effects of factors other than the one being tested

c)

It is tradition

d)

You don’t really need a control

72.

After testing, you may decide to modify your device. This is known as _________.

a)

Prototype

b)

Control

c)

Trial One

d)

Redesigning

73.

An ice chest

a)

Minimizes thermal transfer

b)

Maximizes thermal transfer

c)

Uses mostly conductors

74.

What type of heat transfer does a thermos prevent?

a)

Convection

b)

Radiation and conduction

c)

Convection and radiation

75.

Which type of heat transfer sends heat as waves through empty space?

a)

Convection

b)

Radiation

c)

Conduction

76.

What type of heat transfer requires direct contact with the item being heated?

a)

Convection

b)

Radiation

c)

Conduction

77.

What type of heat transfer circulates the heat through liquid or gas?

a)

Convection

b)

Radiation

c)

Conduction

78.

If a spoon in a cup of soup become warmer, which type of heat transfer is it?

a)

Convection

b)

Radiation

c)

Conduction

79.

Water boiling is due to

a)

Convection

b)

Radiation

c)

Conduction

80.

When air cools down the molecules

a)

Speed up

b)

Slow down

c)

Stay the same

81.

Hot air will

a)

Rise

b)

Sink

c)

Stay where it is

82.

Higher temperatures means

a)

Molecules are moving faster

b)

Molecules are slowing down

83.

Which choice best explains what an insulator is and gives an example?

a)

A material that slows thermal energy transfer; wool

b)

A material that speeds thermal energy transfer; a metal spoon

c)

A device that measures heat; a thermometer

d)

A substance that creates heat; candle wax

84.

When hot air rises, what does cold air do?

a)

Moves downward to replace the rising air

b)

Rises together with the hot air

c)

Stays still at the same level

d)

Disappears

85.

How do dark colors respond differently to heat than light colors?

a)

Dark colors absorb more heat while light colors reflect more

b)

Dark colors reflect more heat while light colors absorb more

c)

Both absorb and reflect the same amount

d)

Color has no effect on heat absorption

86.

Give an example of each type of heat transfer: Convection, Conduction, Radiation.

a)

Warm air circulating in a room from a heater

b)

A metal spoon becoming hot in boiling water

c)

Feeling heat from the Sun on your face

d)

Ice melting because salt is added

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