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8th Grade Chemistry Unit Benchmark Review

Total questions: 32

Worksheet time: 16mins

Name
Class
Date
1.
1. What class of solids is made up of regularly, repeating subunits of tightly packed, orderly arrangement of atoms, ions, and molecules?
a)
a metallic solid
b)
a nonmetallic solid
c)
a crystalline solid
d)
an amorphous solid
2.
2. Nitrogen has a melting point of -210.0 degrees C and a boiling point of -195.8 degrees C. What is nitrogen's state of matter at -215 degrees C?
a)
liquid
b)
solid
c)
plasma
d)
gas
3.
3. Which of the following chemical formulas represents an element, but not a molecule?
a)
C
b)
H2O
c)
H2
d)
NH3
4.
4. Which statement below is also true of the rearrangement of atoms?
a)
The amount of matter is conserved.
b)
The amount of matter decreases.
c)
The number of substances increases.
d)
The number of substances is conserved.
5.
5. What does the data show is occurring?
a)
The hydrochloric acid and magnesium metal react to form a soluble compound.
b)
The hydrochloric acid and magnesium metal do not react.
c)
The hydrochloric acid and magnesium metal react to form a precipitate.
d)
The hydrochloric acid and magnesium metal react to form a gas.
6.
6. Which picture correctly represents a group of molecules. Select the correct image.
a)
Option 1
b)
Option 2
c)
Option 3
d)
Option 4
7.
7. Which of the following statements best describes the Law Of Conservation of Mass?
a)
Atoms are created by some reactions and destroyed by others.
b)
Energy is created as atoms and destroyed in chemical reactions.
c)
Every atom destroyed in a chemical reaction must be replaced.
d)
Atoms cannot be created or destroyed by chemical reactions.
8.
8. An orange is left on the kitchen counter. Which of the following would I do if I wanted to slow down/ decrease the movement/speed of the particles?
a)
Put the orange in the window on a sunny day
b)
Put the orange in the microwave or the oven.
c)
Eat for dinner.
d)
Put the orange in the freezer.
9.
9. June is building a model of a water molecule with balls and sticks. Which of these is the best model for her to build. (Hint: A molecule is two or more atoms bonded together. A water molecule (H2O) is two hydrogen atoms and an oxygen atom bonded together.)
a)
Option 1
b)
Option 2
c)
Option 3
d)
Option 4
10.
10. Molecular motion is a measure of the movement of molecules in a substance. Molecular motion varies between the different states of matter. For example, the molecules in ___________ move more/faster than the molecules in ____________.
a)
liquids, gases
b)
gases, solids
c)
solids, liquids
d)
solids, gases
11.
11. Which of the following is true about the mass of the products in a chemical reaction?
a)
The total mass of the products in a chemical reaction will be significantly more than the total mass of the reactants/
b)
The total mass of the products in a chemical reaction will be significantly less than the total mass of the reactants.
c)
The total mass of the products in a chemical reaction will never be equal to the total mass of the reactants.
d)
The total mass of the products in a chemical reaction is conserved and will be equal to the total mass of the reactants.
12.
12. The model below represents a(n) ___________ in which the blue sphere and white spheres represent _________.
a)
atom, different elements
b)
atom, the same elements
c)
molecule, different elements
d)
molecule, the same elements
13.
13. What does all matter have in common?
a)
It is made up of molecules.
b)
It is too small to be seen.
c)
It is made up of atoms.
d)
It is all solid.
14.
14. Which statement is a correct interpretation of the data?
a)
Only the dissolving of substance A absorbed heat (endothermic).
b)
Only the dissolving of substance B released heat (exothermic).
c)
The dissolving of substance A released heat (exothermic) and the dissolving of substance B absorbed heat (endothermic)
d)
The dissolving of substance B released heat (exothermic) and the dissolving of substance A absorbed heat (endothermic)..
15.

15. The diagram shows atoms that are all arranged into groups in the same way. Looking at this diagram, what does it represent?

a)
a single type of element
b)
two different substances
c)
a single type of substance
d)
three different substances
16.
16. Hydrogen gas (H2) and chlorine gas (Cl2) react to form hydrochloric acid (HCl) (hydrogen chloride). Which statement below is TRUE about the reaction?
a)
The same atoms are present, so the chemical properties are the same.
b)
The atoms of the reactants have combined to form a new substance.
c)
The product that is formed has the same physical properties as the reactants.
d)
The two gases have mixed together, but a new substance has NOT formed.
17.

17. The colored shapes shown below are models. Some of the models represent single atoms. Other models represent molecules. Which of the models are MOLECULES? (Check all of the correct answers.)

a)

Option 1

b)

Option 2

c)

Option 3

d)

Option 4

e)
All are examples of single atoms
18.
18. Which of the following statements about atoms is true?
a)
Atoms may be joined together in well-defined molecules.
b)
Various groups of atoms compose all known substances.
c)
Atoms may be arranged in repeating crystal patterns
d)
all of these
19.
19. A molecule can be made of which of the following? More than one answer may be correct.
a)
a single element
b)
many elements
c)
a single atom
20.

20. When aluminum reacts with oxygen, it forms aluminum oxide. (See equation to the left.) If 100g of Aluminum (Al) combines with 20g of oxygen (O2), how much Aluminum oxide is formed?

a)
80 g Al2O3
b)
20 g Al2O3
c)
100 g Al2O3
d)
120 g Al2O3
21.

21. At which point on the graph (to the left) would water be entirely a solid?

a)
A
b)
B
c)
C
d)
D
e)
E
22.

22. What elements will be present in the substances that are created (the products) when ethanol burns? (See information to the left.)

a)
the elements cannot be determined
b)
carbon, hydrogen, and oxygen only
c)
carbon and hydrogen only
d)
nitrogen, sulfur, and sodium only
23.
23. Which of the following is the phase of matter in which the molecules of a substance have a definite shape and a definite volume?
a)
gas
b)
solid
c)
liquid
d)
all of the these
24.

24. Consider the chemical reaction to the left. Which of the following statements about this reaction is true?

a)
Heat is absorbed by the reaction (endothermic).
b)
The reaction releases heat (exothermic).
c)
Oxygen is produced by the reaction.
d)
The reaction requires water to take place.
25.

25. Look at the statement to the left. What could the engineer do to reduce the temperature the water reaches when calcium chloride is added to it?

a)
add the calcium chloride more rapidly
b)
decrease the amount of water in the pool
c)
add the calcium chloride more slowly
d)
increase the amount of calcium chloride added
26.

26. Based on the information given in the table, the best definition of an endothermic reaction would be......

a)
a reaction that does not require heat.
b)
a reaction that has one reactant.
c)
a reaction that releases heat.
d)
a reaction that absorbs heat.
27.

27. The chemical reaction shown in the diagram is in a closed system. What is true about the system while the reaction occurs?

a)
The total mass of the particles in the system stays the same.
b)
The total mass of the particles in the system decreases.
c)
The total mass of the particles in the system increases.
d)
The total number of particles in the system increases.
28.

28. Read information to the left. Rodrigo wants to improve his latest design. Which of the following should he try? (Choose the 2 best answers.)

a)
better insulation
b)
a greater amount of solution
c)
a more concentrated solution
d)
a less concentrated solution
e)
less insulation
29.
29. Which is most likely true about the yellow solid ?
a)
It is solid lead nitrate.
b)
It was secretly added to the test tube by the scientist.
c)
It is a new substance with different properties.
d)
It is solid potassium iodide.
30.

30. One of the options below represents only the type and number of atoms in a water molecule; used to represent substances in a chemical equation. Choose the best answer to this statement.

a)

Option 1

b)

Option 2

c)

Option 3

31.

31. One of the options below shows how several water molecules are oriented in space relative to one another in addition to showing relative size and number of atoms in a molecule. Choose the best answer to this statement.

a)

Option 1

b)

Option 2

c)

Option 3

32.

32. One of the options below shows the relative size and number of atoms in a water molecule and how the atoms are joined to one another. Choose the best answer to this statement.

a)

Option 1

b)

Option 2

c)

Option 3

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