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Chemistry unit review

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.
Which of the following is true about elements?
a)
All chemicals are elements.
b)
Elements are pure substances that can't be broken down.
c)
Elements can be broken down chemically or electrically.
d)
Elements are made of more than one substance.
2.
The compound H2SO4 has how many elements?
a)
3
b)
4
c)
6
d)
7
3.
An unknown element is non-malleable, non-lustrous, and non-conductive.  This element is a...
a)
metal
b)
metalloid
c)
non-metal
d)
undetermined
4.
Cooking a steak represents a...
a)
physical change
b)
chemical change
5.
Dissolving Kool-Aid in water represents a...
a)
physical change
b)
chemical change
6.
Rusting is a chemical change because there is evidence of...
a)
state of matter change
b)
change in size
c)
color change
d)
production of a gas
7.
A gold-colored crown has a mass of 4491.1g and a volume of 232.7mL. What is its density?  Identify the material using this chart:
a)
0.052 g/mL, lithium
b)
19.3 g/mL, gold
c)
2.7 g/mL, aluminum
d)
can't be determined
8.
You measured the mass of a gummy bear to be 3.4g.  In 30.0mL of water, the gummy bear displaces the water to 33.5mL.  What is the density of the gummy bear, and will it sink or float?
a)
0.97 g/mL, sink
b)
0.97 g/mL, float
c)
1.03 g/mL, sink
d)
1.03 g/mL, float
9.
A change in temperature and color of a substance during a science experiment means that what took place?
a)
Physical Change
b)
Chemical Change
10.
When different elements combine to make a compound, what happens?
a)
The elements stay the same, just joined up.
b)
They become a new substance with new properties!
11.
Groups are vertical columns in the periodic table and share...
a)
the same number of protons
b)
similar physical and chemical properties
c)
the same number of neutrons
d)
the same atomic mass
12.
Given the following compound, how many oxygen atoms are there?  H2OAl3
a)
1
b)
2
c)
3
d)
6
13.
How many different elements are involved in this chemical reaction: Br4H2N + Al5 --> 2AlHBr2 + Al3N
a)
9
b)
4
c)
6
d)
1
14.
How many atoms of each element are found in this compound?  C2H3N5C
a)
2 Carbon, 3 Hydrogen, 5 Nitrogen
b)
1 Carbon, 2 Hydrogen, 3 Nitrogen
c)
3 Carbon, 3 Hydrogen, 5 Nitrogen
15.
Ice breaking, chocolate melting and sugar dissolving are examples of...
a)
chemical changes
b)
physical changes
16.
What has properties of both metals and nonmetals?
a)
Noble Gases
b)
Metalloids
c)
Halogens
d)
Acids
17.
When a gas is produced during a science experiment, which occurred?
a)
Physical change
b)
Chemical reaction
18.
Which of the following is a COMPOUND?
a)
CO2
b)
Na
c)
Br3
d)
Li2
19.
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
20.
Salt dissolves in water
a)
physical Change
b)
chemical change
21.
hydrochloric acid reacts with magnesium to produce hydrogen gass
a)
physical change
b)
chemical change
22.
a piece of copper is cut in half
a)
physical change
b)
chemical change
23.
iron pipe rusts
a)
physical change
b)
chemical change
24.
rubbing alcohol evaporates
a)
physical change
b)
chemical change
25.

Which statement does NOT apply to metals?

a)

They are ductile.

b)

They are brittle.

c)

They are malleable.

d)

They are good conductors.

26.

A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?

a)

Heat is added to the sugar crystals.

b)

The sugar melts and becomes a liquid.

c)

The temperature of the sugar increases.

d)

Gas is produced as the sugar turns black.

27.

Which of the following are physical properties of Metals?

a)

Luster

b)

Reactivity

c)

Ductile

d)

Malleable

e)

Gases at room temperature

28.

Which of the following are physical properties of Nonmetals?

a)

Dull

b)

Luster

c)

Brittle

d)

Good Conductors

e)

Gases at room temperature

29.

Which of the following are properties of Metalloids?

a)

Solids

b)

Semiconductors

c)

Brittle

d)

Hard

30.

Which class of elements best conducts heat and electricity?

a)

Nonmetals

b)

Metalloids

c)

Metals

31.

A(n) _______________________ cannot be broken down into any other substance.

a)

mixture

b)

atom

c)

element

d)

compound

32.

Which of the following are signs a chemical reaction has occurred?

a)

Color change

b)

Gas formation

c)

Precipitate Formation

d)

Temperature Change

33.

Two or more different elements chemically bonded together

a)

Element

b)

Mixture

c)

Compound

d)

Molecule

34.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
35.
Classify the picture with the correct label.
a)
Element
b)
Compound
c)
Mixture of Elements
d)
Mixture of Compounds
36.

Which of the following are examples of chemical properties?

a)

Reactivity

b)

Corrosion

c)

Density

d)

Flammability

37.
Which of the following is a compound?
a)
CO2
b)
H
c)
O
d)
Na
38.
What type of element usually has a dull appearance and is generally NOT a good conductor of heat or electricity?
a)
Metal
b)
Metalloid
c)
Nonmetal
d)
Solid
39.
Based on the descriptions from the chart, it is very likely that material A is which of the following? 
a)
Metal
b)
Metalloid
c)
Nonmetal
d)
Renewable Resource
40.
In the chart, material A is “small but heavy”.  What conclusion can be drawn from this?
a)
Material A is brittle
b)
Material A is not malleable
c)
Material A is high density
d)
Material A is a non-conductor
41.
In the chart, material B is not malleable.  How do we know this?
a)
It is dull and not shiny
b)
it breaks apart when hit by a hammer
c)
it changes shape when hit with a hammer
d)
It catches fire when held over a Bunsen burner.
42.
As seen in the chart, the observer noticed that material A was shiny, or that it reflected light.  This quality is known as
a)
Color
b)
Luster
c)
Contrast
d)
Malleability
43.
Which one of the following is a chemical property of matter?
a)
It's density
b)
It's boiling point
c)
It's melting point
d)
Whether it burns
44.
Water is an example of:
a)
Element
b)
Compound
c)
Solution
45.

Substances that can be hammered into thin sheets are:

a)

metals

b)

nonmetals

c)

both metals and nonmetals

46.
What is the volume of Object X?
a)
10.0 cm3
b)
15.0 cm3
c)
20.0 cm3
d)
25.0 cm3
47.
Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?
a)
7 mL
b)
7 g/cm3
c)
28 g/cm3
d)
1/7 g/cm3
48.

Properties that can be described when matter doesn't change are called _____________________ properties.

a)

chemical

b)

physical

49.

Properties that can be observed when matter DOES change composition are called __________________ properties.

a)

physical

b)

chemical

50.

All of the following are examples of physical properties, EXCEPT:

a)

Melting Point

b)

Flammability

c)

Freezing Point

d)

Density

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