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8.1 Unit Exam

Total questions: 67

Worksheet time: 1hrs 17mins

Name
Class
Date
1.
What kind of change is a phase change?
a)
Physical - it's still the same substance
b)
chemical - it's made of chemicals 
2.
A catalyst  
a)
is added to a reaction to make it slow down 
b)
breaks apart and is changed 
c)
provides an energetic short cut to the products 
3.
Chemical Formulas ...
a)
are written in alphabetical order 
b)
represent the destruction or creation of atoms 
c)
represent how atoms are arranged in a chemical reaction 
4.
The compounds or elements present at the end of a reaction 
a)
reactants
b)
catalyst
c)
products
d)
energy 
5.
The compounds and elements that are present at the beginning of a reaction:
a)
reactants
b)
catalyst
c)
products
d)
energy 
6.
What is the law of Conservation of Mass?
a)
A measure of how much mass is created or destroyed. 
b)
Mass can neither be created nor destroyed during a chemical reaction. 
7.
Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the reactant(s).
a)
Hydrogen and Oxygen
b)
water
8.
Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the product(s).
a)
Hydrogen and oxygen
b)
water
9.
Angelina mixes 2 substances together in a beaker. The beaker becomes hot and the liquid changes color.
Did a chemical reaction occur?
a)
yes, because the properties changed and a new substance was made.
b)
no, because the properties did not change.
10.
Which of the following are NOT signs that a chemical reaction occured?
a)
the properties changed
b)
bubbles of gas formed
c)
color stays the same
d)
smells different
11.
What is a precipitate?
a)
a change in color 
b)
a change in temperature
c)
a solid formed
d)
a gas formed
12.
a student mixes  apple juice, water, and cinnamon together. Did a chemical reaction occur?
a)
Yes, because the apple juice changed the color of the water.
b)
yes, because the temperature stayed the sam
c)
no, because the properties stayed the same.
d)
yes, because dissolving is always a chemical reaction.
13.
Burning is always a chemical reaction.
a)
True
b)
false
14.
Which of the following is NOT a chemical reaction?
a)
burning a marshmallow in a campfire.
b)
a campfire
c)
acid rain turning a copper roof green.
d)
Dissolving red Koolaid in water.
15.
Which of the following is a chemical reaction?
a)
Burning bread in the toaster.
b)
melting wax in a microwave.
c)
dissolving salt in water
d)
boiling water to make steam.
16.
What chart should you reference to lookup information about elements?
a)
Elemental map
b)
Periodic Table of Elements
c)
Table of atoms
d)
None of the above
17.
Protons and neutrons clump together to form the __________ of an atom.
a)
nucleus
b)
centrosome
c)
outer shell
d)
orbital
18.
This subatomic particle of an atom has a POSITIVE charge.
a)
Electron
b)
Neutron
c)
Proton
d)
Betatron
19.
This subatomic particle of an atom has NO charge.
a)
Electron
b)
Proton
c)
Atom
d)
Neutron
20.
This subatomic particle of an atom has a NEGATIVE charge.
a)
Electron
b)
Proton
c)
Atom
d)
Neutron
21.
A molecule is made up of ____ or more atoms.
a)
1
b)
2
c)
3
d)
4
22.
The number of atoms it would take to make a molecule of water.
a)
1
b)
2
c)
3
d)
4
23.

What does conservation of matter mean?

a)

Matter cycles through an ecosystem and 10% is lost as you move through each trophic level.

b)

Matter cannot be created, but can be destroyed.

c)

Matter cannot be created nor destroyed, and cycles through ecosystems.

d)

Matter and energy both move through ecosystems with 100% efficiency.

24.

What is an element?

a)

A pure substance that cannot be broken down.

b)

Two atoms bonded together.

c)

Two or more different types of atoms bonded together.

d)

An molecule with an unequal distribution of charge.

25.

What are atoms composed of?

a)

Protons and electrons.

b)

Protons, neutrons, and electrons.

c)

Neutrons and electrons.

d)

Ions, elements, and compounds.

26.
The beginning substances in a chemical reaction are called...
a)
reactants
b)
products
27.

How many H atoms are in H2O?

a)

1

b)

2

28.
Carbon dioxide (CO2) contains how many atoms of oxygen?
a)
0
b)
1
c)
2
d)
3
29.
The amount of matter in an object is a measure of the object's ________________.
a)
volume
b)
density
c)
mass
d)
solubility
30.
What is the formula for calculating density?
a)
Mass ∗ Volume
b)
Volume ∗ Mass
c)
Mass ÷ Volume
d)
Volume ÷ Mass
31.
Which statement is true?
a)
Oil is the most dense substance.
b)
Corn syrup is less dense than water.
c)
Oil is less dense than water.
d)
Oil and corn syrup have the same density but different masses.
32.
In which state does matter completely fill its closed container?
a)
Gas
b)
Liquid
c)
Solid
d)
Ice
33.
Which state of matter has a fixed shape and volume and it's molecules move very slowly?
a)
Liquid
b)
Gas
c)
Solid
d)
Plasma
34.
When a gas turns into a liquid, it is called ___________________.
a)
Condensation
b)
Evaporation
c)
Melting
d)
Freezing
35.

Which of these pH values represent an acid?

a)

4

b)

8

c)

10

d)

12

36.

Milk is a very weak acid. What might its pH value be?

a)

6.5

b)

7.8

c)

4.2

d)

12.2

37.

When an acid is dissolved in water, it turns red litmus paper blue.

a)

True

b)

False

38.

Which of the following are properties of acids?

a)

They conduct electricity when dissolved in water

b)

They taste sour

c)

They react with metals to produce hydrogen gas

d)

All of the answer choices are correct

39.

Which of the following is a property of a base?

a)

bitter taste

b)

reacts with metals

c)

salty

d)

sour taste

40.

Which of the following pH values represents a base?

a)

2.1

b)

4.6

c)

6.8

d)

8.1

41.

The strongest bases have pH values close to

a)

0

b)

14

c)

7

d)

5

42.
Which of the following statements is correct?
a)
Blue litmus paper turns red when placed in a base.
b)
Red litmus paper turns blue when placed in a base.
c)
Blue litmus paper stays blue when placed in an acid.
d)
Red litmus paper stays red when placed in a base.
43.

HNO3 + H2O → H3O+ + NO31-

NO31- is the conjugate base of

a)

H2O

b)

HNO3

c)

H3O+

d)

none of the above

44.

What does pH measure?

a)

strength of an acid

b)

strength of a base

c)

strength of both acids and bases

d)

concentration of H+ ions

45.

As the pH of a solution gets lower, the solution becomes more _____.

a)

acidic

b)

basic (or alkaline)

c)

neutral

d)

ionic

46.

The pH of 4 solutions were measured in a lab. Which solution is the most acidic?

a)
b)
c)
d)
47.

NH3 + H2O → NH4+ + OH-

NH3 is a Bronsted Lowry

a)

Acid

b)

Base

c)

conjugate acid

d)

conjugate base

48.
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
49.
The number to the lower side of an element is a 
a)
Subscript
b)
Superscript
c)
Coefficient
d)
Charge
50.
The number in front of a compound or element is a 
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
51.
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
52.
Which of these is not a chemical reaction?
a)
Burning of wood
b)
Milk going bad
c)
Mixing vinegar and baking soda
d)
Melting of ice
53.
The coefficient in  3H2O is
a)
6
b)
2
c)
3
d)
5
54.
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
55.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g
56.
What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
57.
Measure of the amount of matter 
a)
mass
b)
volume
c)
weight
d)
density
58.
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
59.

A chemical change is different than a physical change because in a chemical change

a)

chemicals are used

b)

molecules do not physically touch

c)

a new substance is formed and in a physical no new substance is formed

d)

the change can be seen but in a physical change it cannot

60.

How many Carbons are present on the reactant side?

a)

1

b)

2

c)

3

d)

4

61.

How many Hydrogens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

62.

How many Oxygens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

63.

Why are chemical equations always balanced? Select ALL that apply.

a)

Matter cannot be created.

b)

Matter cannot be destroyed.

c)

Matter can only be rearranged/conserved.

d)

Matter doesn't matter.

64.

What does it mean for a reaction to be endothermic? Choose 2 of the following.

a)

When two substances react, the temperature of the mixture decreases.

b)

When two substances react, the temperature of the mixture increases.

c)

There is less energy going into the reactant to break the bond than there is energy leaving the product.

d)

There is more energy going into the reactant to break the bond than there is energy leaving the product.

e)

The amount of energy entering and leaving is the same.

65.

What does it mean for a reaction to be exothermic? Choose 2 of the following.

a)

When two substances react, the temperature of the mixture decreases.

b)

When two substances react, the temperature of the mixture increases.

c)

There is less energy going into the reactant to break the bond than there is energy leaving the product.

d)

There is more energy going into the reactant to break the bond than there is energy leaving the product.

e)

The amount of energy entering and leaving is the same.

66.

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

a)

Yes, the amount of atoms for each element are equal on both the reactant and product side.

b)

No, the carbons are not the same number on both the reactant and product side.

c)

No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

d)

No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

67.

Which of the following is a common sign that a chemical change has occurred?

a)

A chemical has turned a different color, bubbled, and/or changed temperature.

b)

A chemical has changed to a different state of matter, such as a liquid to a solid.

c)

A chemical has changed size.

d)

A chemical has become a different shape.

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