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Unit 3 Review

Total questions: 66

Worksheet time: 33mins

Name
Class
Date
1.

What characteristics of a substance can be seen without changing the identity of the substance

a)

chemical property

b)

both properties

c)

neither properties

d)

physical property

2.

Glass shattering on the floor

a)

physical

b)

chemical

3.

Baking soda reacting with vinegar

a)

Chemical

b)

Physical

4.

Ice melting in a glass of water

a)

Chemical

b)

Physical

5.

Which of these statements is true?

a)

Iron rusting is a chemical change

b)

How easy something bends or folds is a chemical property

c)

Hardness is a chemical property

d)

Density is a chemical property of matter

6.

Which are physical properties of matter

a)

density, state of matter

b)

flammability, conductivity

c)

color and reactivity

d)

combustibility, conductivity

7.

Which of the following shows burning as a chemical change

a)

change in size of material

b)

change in shape of material

c)

heat and light being produced

d)

change in appearance of material

8.

What has to happen for a chemical change to occur

a)

matter disappear

b)

different shape

c)

different color

d)

new substance made

9.

If a solid is made after two liquids are mixed.......

a)

the change is chemical

b)

the change is a simple mixture

c)

the change can be reversed

d)

the change is physical

10.

If the atoms stay bonded together exactly the same after a change, it is a ....

a)

chemical change

b)

mixture

c)

solution

d)

physical change

11.

If you freeze something, what happens?

a)

the particles go further apart and volume increase

b)

the particles go further apart and volume decreases

c)

the particles move closer together and volume increase

d)

the particles move closer together and volume decreases

12.

While cooking dinner, Kelly places a pot full of water on the stove to heat up. Kelly notices that small bubbles start to appear at the bottom after three minutes. What type of property of water is Kelly observing?

a)

Kelly is observing a chemical property because the water is changing to steam.

b)

Kelly is observing a chemical property because the water is reacting with the pot.

c)

Kelly is observing a physical property because the water is changing to steam.

d)

Kelly is observing a physical property because the water is reacting with the pot.

13.

A new substance is formed during which type of change?

a)

Chemical Change

b)

Physical Change

14.

Properties that can only be observed or measured by changing the chemical identity of a substance.

a)

Chemical Properties

b)

Changeable Properties

c)

Physical Properties

d)

Combustible Properties

15.

Release of light, temperature change, sudden color change, sudden appearance of a solid, and gas given off are all evidence of what?

a)

matter disappearing

b)

chemical change

c)

physical change

d)

physical and chemical changes occurring

16.

Process by which the atoms of one or more substances are rearranged to form different substances.

a)

chemical reaction

b)

solubility

c)

oxidation

d)

physical reaction

17.

Cutting, crushing, melting, and boiling are all examples of what?

a)

chemical changes

b)

Law of Conservation of Particles

c)

physical changes

d)

messes

18.

A change in a substance that affects its chemical properties thus a chemical reaction happens and a new substance is formed.

a)

physical properties

b)

physical change

c)

chemical change

d)

chemical properties

19.

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

a)

ALL of these are examples of chemical changes

b)

decomposing

c)

rusting

d)

burning

20.

TRUE or FALSE: "Breaking a glass window with a baseball is an example of a chemical change."

a)

FALSE

b)

TRUE

21.

Which of the following options provides evidence of a CHEMICAL change?

a)

Wood is burned releasing ash and smoke

b)

Salt dissolves in water

c)

Rocks separate when soil is sifted

d)

Water turns to ice when you put it in the freezer

22.

Which of the following examples provides evidence of a PHYSICAL change?

a)

Wood is burned and releases ash and smoke

b)

When mixed, baking soda and vinegar form gas bubbles

c)

A piece of paper changes shape when you rip it up

d)

Iron rusts over time

23.

Which observations prove a chemical change has occurred?

a)

State of matter change and boiling water bubbles

b)

Unexpected color change and temperature change

c)

Dissolving and expected color change

d)

Mixing and dissolving

24.

When mixing milk and vinegar, a white, chunky, solid substance is formed. What has occurred?

a)

Physical change: freezing

b)

Chemical change: production of a solid

c)

Physical change: state of matter

d)

Chemical change: rust

25.

When iron is exposed to air over a long period of time, it forms rust. This is an example of what?

a)

A new substance forming

b)

Burning: a new substance

c)

Shape change: no new substance

d)

Color change: no new substance

26.

Fireworks explode on the Fourth of July. Is this an example of a physical or chemical change?

a)

Chemical

b)

Physical

27.

A baker bakes a birthday cake. Is this an example of a physical or chemical change?

a)

Chemical

b)

Physical

28.

Your dad fries you an egg. Is this an example of a physical or chemical change?

a)

Chemical

b)

Physical

29.

You cut an apple. Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

30.

An ice cube melts. Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

31.

Select all that are physical changes.

a)

Ice Melting

b)

Water Evaporating

c)

Sugar Dissolving

d)

Boiling Water

e)

Glass Breaking

32.

Select all that are chemical changes.

a)

Iron Rusting

b)

Digestion

c)

Campfire

d)

Baking A Cake

e)

Photosynthesis

33.

Select the physical change.

a)

Sugar Dissolving

b)

Rotting Bananas

34.

Fe2O3

How many atoms of Iron are in this compound?

a)

3

b)

2

c)

4

d)

1

35.

How many atoms of hydrogen are in C6H12O6?

a)

12

b)

18

c)

6

d)

2

36.

How many different elements are present in H2COCH2?

a)

5

b)

4

c)

3

d)

2

37.

Calculate the number of Oxygen atoms in Al(OH)3

a)

3

b)

1

c)

2

d)

4

38.

How many total POTASSIUM atoms are in this formula?

a)

8

b)

12

c)

2

d)

4

39.

How many elements are in this chemical formula? NaHCO3​

a)

4

b)

2

c)

1

d)

3

40.

Coefficients in chemical formulas...

a)

Multiply elements without subscripts

b)

Multiply EVERYTHING!

c)

Multiply just the first atom

d)

Add to the subscripts at the end of the molecule

41.

C3H5(NO3)3

Choose the correct count of each element in this compound.

a)

C = 9, H = 15, N = 1, O = 3

b)

C = 3, H = 5, N = 3, O = 9

c)

C = 3, H = 5, N = 1, O = 9

d)

C = 9, H = 15, N = 3, O = 9

42.

How many atoms of hydrogen are in this compound?

a)

2

b)

4

c)

1

d)

3

43.

Select the chemical formula for this molecule.

a)

FB

b)

B1F3

c)

BF

d)

BF3

44.

What is the chemical formula for this molecule?

a)

H1O2

b)

H2O2

c)

HO

d)

H1O1

45.

What is the chemical formula for this molecule?

a)

C1I4

b)

C2I2

c)

C1I1

d)

CI4

46.

How many atoms of oxygen are in this compound? 2Ca(OH)2

a)

4

b)

2

c)

3

d)

1

47.

How many molecules are in 4H2O?

a)

8

b)

6

c)

4

d)

2

48.

How many Magnesium are in 10MgCl2?

a)

20

b)

10

c)

5

49.

How many atoms are there TOTAL in H2SO4?

a)

7

b)

6

c)

3

d)

5

50.

Number of N in (NH₄)₂CrO₄

a)

1

b)

8

c)

2

d)

16

51.

A subscript is the small number below a(n) ______ that tells the number of ______ of that element.

a)

element symbol; atoms

b)

compound; elements

c)

atom; element symbol

d)

subscript; protons

52.

Which formulas have the most number of HYDROGENs?

a)

2(NH4)3N

b)

Ca(C2H3O2)2

c)

3H2O

d)

3NaHCO3

53.

Use the chemical formula shown to answer: How many CARBON are in this formula? 5Al(C2H3O2)25\text{Al}(\text{C}_2\text{H}_3\text{O}_2)_2

a)

20

b)

5

c)

2

d)

10

54.

Use the chemical formula shown to answer: How many different elements are in this formula? 5Al(C2H3O2)25\text{Al}(\text{C}_2\text{H}_3\text{O}_2)_2

a)

20

b)

4

c)

10

d)

5

55.

How many elements are present in this compound? (Careful!)

Mg2As3COHNi2

a)

4

b)

6

c)

2

d)

10

56.

How many atoms of oxygen are in 3Fe2O33\text{Fe}_2\text{O}_3

a)

2

b)

9

c)

6

d)

18

57.

How many atoms are present if there is no subscript following the element symbol?

a)

2

b)

0

c)

1 million

d)

only 1

58.

A chemical reaction is balanced when

a)

Same coefficients

b)

Both sides have the same number of atoms

c)

both sides have the same elements

d)

Same subscripts

59.

If reaction starts with 20g of reactants it should produce

a)

a total of 40g of products

b)

a total of 20g of products

c)

a total of 10g of products

d)

a total of 80 g of products

60.

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

61.

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

a)

Originator

b)

Product

c)

Reactant

d)

Produce

62.

Does the equation H2+O2→H2O\text{H}_2 + \text{O}_2 \rightarrow \text{H}_2\text{O} follow the Law of Conservation of Mass?

a)

Yes, because the atoms are equal.

b)

No, because there are more atoms in the product.

c)

No, because more info is needed.

d)

No, because there are more atoms in the reactant.

63.

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

a)

It stays the same chemically.

b)

The wood disappears.

c)

Nothing.

d)

The atoms in the wood and oxygen rearrange and form smoke and ash.

64.

How many grams of OXYGEN would be needed to show conservation of mass in the example shown

(a reaction with 100 g of reactant produces 93 g of mercury and a balloon of oxygen.

How many grams of oxygen are needed so total mass is conserved?)

a)

7 g

b)

100 g

c)

93 g

d)

0 g

65.

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

a)

5g

b)

9g

c)

14g

d)

4g

66.

24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride

a)

38

b)

14

c)

62

d)

24

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