Free Printable Unit Review 8th Science 3rd QTR

1.

What is this?

a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

2.

Milk

a)

Heterogeneous mixture

b)

Homogeneous mixture

3.

cake batter

a)

heterogeneous mixture

b)

homogeneous mixture

4.

What is this?

a)

Element

b)

Compound

c)

Heterogeneous MIxture

d)

Homogeneous Mixture

5.

a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous MIxture

6.

What is it?

a)

Pure Substance

b)

Mixture

7.

What is it?

a)

Pure Substance

b)

Mixture

8.

What is it?

a)

Pure Substance

b)

Mixture

9.

What is it?

a)

Pure Substance

b)

Mixture

10.

a)

Pure Substance

b)

MIxture

11.

When there is one substance....

a)

Pure Substance

b)

Mixture

12.

A group of 2 or more items, that are not chemically combined

a)

Pure Substance

b)

Mixture

13.

When there is 2 or more atoms combined together

a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

14.

Nathan is examining the three models of atoms shown below. He knows that the models were developed in the following order: Thomson’s model, then Rutherford’s model, and finally, the current model based on modern atomic theory.

What can Nathan most likely conclude from these three related but different models?

a)

There are multiple ways to draw an atom, and all of them are correct.

b)

No one really knows anything about the structure of an atom.

c)

Scientists cannot seem to agree on the structure of an atom.

d)

Scientists build on and modify the work of other scientists.

15.

What particle is NOT located in the nucleus?

a)

proton

b)

electron

c)

neutron

d)

quark

16.

Look closely at part of the periodic table shown. Which of the following pairs of elements have properties that are the least similar?

a)

N and P

b)

Ge and Br

c)

He and Xe

d)

Cl and I

17.

Steven noticed that one of the ingredients contained in his fruit-flavored snack was “artificial flavors.” One chemical used for that purpose is isopropyl acetate (CH₃COOC₃H₇). How many carbon atoms are present in one molecule of isopropyl acetate, CH₃COOC₃H₇?

a)

1

b)

2

c)

5

d)

6

18.

Ethane, one of the smallest hydrocarbons, is used in the production of many other chemicals. How many hydrogen (H) atoms are shown in the model of ethane?

a)

2

b)

3

c)

6

d)

8

19.

Francine’s mother made a fruit salad for breakfast. While Francine was eating her fruit salad, she exclaimed to her mother, ”I’m enjoying this mixture!”. Why did Francine refer to the fruit salad as a mixture?

a)

The fruit salad contains various ingredients mixed in fixed amounts.

b)

The fruit salad contains various ingredients that each retain their original chemical properties.

c)

The fruit salad contains components whose original chemical properties have been changed after mixing.

d)

The fruit salad contains various ingredients that can be separated only by using chemical means.

20.

The illustration below shows the process of two different substances being combined. Which process does the illustration show?

a)

two pure substances physically combined to form a mixture

b)

two pure substances chemically combined to form a different pure substance

c)

a mixture separated into the components that were originally combined

d)

a solution formed by dissolving a solid in a liquid

21.

Atoms are the smallest unit of an element and are composed of subatomic particles. An atom that has a balanced charge is referred to as “neutral”. Which of the following statements must be true about a neutral atom?

a)

The atom must have an even number of protons.

b)

The atom must have as many neutrons as protons.

c)

The number of electrons and protons in the atom must be equal.

d)

All of the neutrons and protons are found in the nucleus of an atom.

22.

Nathan is examining the three models of atoms shown below. He knows that the models were developed in the following order: Thomson’s model, then Rutherford’s model, and finally, the current model based on modern atomic theory.

What can Nathan most likely conclude from these three related but different models?

a)

There are multiple ways to draw an atom, and all of them are correct.

b)

No one really knows anything about the structure of an atom.

c)

Scientists cannot seem to agree on the structure of an atom.

d)

Scientists build on and modify the work of other scientists.

23.

The smallest piece of matter that still has the properties of an element is a(n) _________________.

a)

compound

b)

electron

c)

atom

d)

nucleus

24.

What particle is NOT located in the nucleus?

a)

proton

b)

electron

c)

neutron

d)

quark

25.

Look closely at part of the periodic table shown. Which of the following pairs of elements have properties that are the least similar?

a)

N and P

b)

Ge and Br

c)

He and Xe

d)

Cl and I

26.

Steven noticed that one of the ingredients contained in his fruit-flavored snack was “artificial flavors.” One chemical used for that purpose is isopropyl acetate (CH₃COOC₃H₇). How many carbon atoms are present in one molecule of isopropyl acetate, CH₃COOC₃H₇?

a)

1

b)

2

c)

5

d)

6

27.

Ethane, one of the smallest hydrocarbons, is used in the production of many other chemicals. How many hydrogen (H) atoms are shown in the model of ethane?

a)

2

b)

3

c)

6

d)

8

28.

Francine’s mother made a fruit salad for breakfast. While Francine was eating her fruit salad, she exclaimed to her mother, ”I’m enjoying this mixture!”. Why did Francine refer to the fruit salad as a mixture?

a)

The fruit salad contains various ingredients mixed in fixed amounts.

b)

The fruit salad contains various ingredients that each retain their original chemical properties.

c)

The fruit salad contains components whose original chemical properties have been changed after mixing.

d)

The fruit salad contains various ingredients that can be separated only by using chemical means.

29.

The illustration below shows the process of two different substances being combined. Which process does the illustration show?

a)

two pure substances physically combined to form a mixture

b)

two pure substances chemically combined to form a different pure substance

c)

a mixture separated into the components that were originally combined

d)

a solution formed by dissolving a solid in a liquid

30.

In science class, Jonathan added a small amount of sand to a beaker of water. He stirred it vigorously so that all the sand swirled around in the water. Jonathan then claimed to his classmates that he had made a solution. However, his teacher told Jonathan that he was mistaken. Why was the teacher correct?

a)

Jonathan made a compound, not a mixture.

b)

A solid substance cannot dissolve in water to form a solution.

c)

The sand will eventually settle to the bottom and will not dissolve in the water.

d)

A chemical reaction did not take place, so a solution was not formed.

31.

Mixture

a)

Physical Combination

b)

Chemical Combination

32.

Mixtures Can be

a)

Solid

b)

Liquid

c)

Gas

d)

None of the Above

33.

What will cause the particles in a substance to vibrate more or move faster?

a)

Cooling

b)

Heating

c)

Breaking

d)

Simplifying

34.

Which state of matter does not have a definite or volume?

a)

solid

b)

liquid

c)

gas

d)

quartz

35.

This type of mixture is NOT the same throughout; you can see the different parts.

a)

compound

b)

heterogeneous mixture

c)

homogeneous mixture

d)

solution

36.

This type of mixture is the same throughout and you cannot see the different parts.

a)

heterogeneous mixture

b)

element

c)

homogeneous mixture

d)

compound

37.

The boiling point of water is _________^oC.

a)

0

b)

32

c)

100

d)

212

38.

The melting point of water is _________^oF.

a)

0

b)

32

c)

100

d)

212

39.

A pure substance made of only one kind of atom.

a)

mixture

b)

compound

c)

atom

d)

element

40.

A group of 2 or more atoms that are chemically bonded

a)

molecule

b)

element

c)

compound

d)

mixture

41.

Everything on earth that has mass and takes up space.

a)

atoms

b)

compounds

c)

elements

d)

matter

42.

How many atoms of Sulfur are found in the formula 3Ag₂SO₄?

a)

1

b)

3

c)

6

d)

12

43.

What does this drawing represent?

a)

element

b)

compound

c)

mixture

44.

What does this drawing represent?

a)

element

b)

compound

c)

mixture

45.

Which of the following correctly represents an element?

a)

Water – H2O

b)

Copper – Cu

c)

Carbon monoxide – CO

d)

Salt – NaCl

46.

Which of the following substances represents an element?

a)

2, 3, 5, and 6

b)

2, 5, and 6

c)

1 and 4

d)

1, 3, and 4

47.

Which of the following substances represents a compound?

a)

2, 3, 5, and 6

b)

2 and 6

c)

1 and 4

d)

1, 2, 3, and 4

48.

Compounds are pure substances. What other substances are considered pure substances?

a)

Chemical reactions

b)

Elements

c)

Mixtures

d)

Solutions

49.

Which model shown above best represents the element neon as a gas?

a)

Model A

b)

Model B

c)

Model C

d)

Model D

50.

Jasmine is making some macaroni and cheese for dinner. To begin, she places water in a pot on the stove. She adds salt to the water and heats the solution. She then adds the noodles and cooks them until they are done. She adds cheese, butter, and milk. She stirs it completely. The substance in the pot is a(n)

a)

element

b)

compound

c)

homogenous mixture

d)

heterogenous mixture

51.

( Ca + Cl₂ --> CaCl₂ ) The ______________ Calcium combines with the ______________ Chlorine to form the ______________ Calcium Chloride.

a)

compound; compound; element

b)

element; compound; compound

c)

element; compound; element

d)

element; element; compound

52.

Study the liquids listed in the table. How would you best describe each liquid?

a)

Liquid X is an acid and Liquid Y is a base.

b)

Both liquids are bases.

c)

Both liquids are acids.

d)

Liquid X is a base and Liquid Y is an acid.

53.

According to the table, which leaves are the most basic alkaline?

a)

Robles

b)

Kakawate

c)

Kalumpit

d)

Trichanthera

54.

Study the solubility graph given. Which solution dissolves the least with temperature increase?

a)

NaCl

b)

KNO₃

c)

Ce₂(SO₄)₃

d)

Pb(NO₃)₂

55.

Group A: Water, Table Salt, Oxygen, Carbon Dioxide

Group B: Salt Water, Air, Milk, Blood

Which of the following best describes the groups?

a)

Group A are mixtures; Group B are solutions

b)

Group A are elements; Group B are mixtures

c)

Group A are pure substances; Group B are mixtures

d)

Group A are compounds; Group B are pure substances

56.

If a theory is challenged by new evidence, which of the following could occur?

a)

it could be altered

b)

it is automatically accepted

c)

the evidence is false

d)

A vote is taken to accept or reject the new evidence

Unit Review 8th Science 3rd QTR

Total questions: 56

Worksheet time: 28mins

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