WorksheetsElements, Compounds, and Reactions Review
Total questions: 54
Worksheet time: 43mins
Name
Class
Date
1.
Carbon is considered an element, while carbon dioxide is considered a compound. This is because carbon dioxide is ---
a)
a gas at room temperature.
b)
made of two different elements.
c)
given off by green plants.
d)
useful to human beings
2.
What is this element...Au
a)
Iron
b)
Titanium
c)
Gold
d)
Flourine
3.
What is the symbol for Calcium
a)
Cl
b)
Ca
c)
Cm
d)
ca
4.
What does the element AI stand for ?
a)
Gold
b)
Actinium
c)
Iron
d)
Aluminum
5.
which one can be found on the periodic table
a)
Compound
b)
Element
6.
Element is a
a)
pure substance
b)
compound
c)
mixture
d)
molecule
7.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
8.
Is salt (NaCI) a compound or a element
a)
Compound
b)
element
9.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
10.
Which of the following could be a symbol on he periodic table of elements?
a)
JZ
b)
jz
c)
Jz
d)
JZa
11.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
12.
What is made up two or more elements that are chemically combined?
a)
Element
b)
Mixture
c)
Compound
d)
Solids
13.
Which of the following an element?
a)
Carbonic Acid
b)
Copper
c)
Iron and Copper
d)
Water
14.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
15.
Is sugar (C12H22O11) an element or a compound?
a)
Element
b)
Compound
16.
Is water an element or a compound?
a)
Element
b)
Compound
17.
The properties of the elements that make up a compound are usually very similar to the compound itself.
a)
True
b)
False
18.
Is Iron (Fe) an element or a compound?
a)
Element
b)
Compound
19.
A pure substance...
a)
is an element or a compound
b)
is an element or a mixture
c)
is a compound or a mixture
d)
is a mixture
20.
NaHCO3 is an example of —
a)
an abbreviation
b)
a compound
c)
a mixture
d)
an element
21.
Which contains only elements?
a)
A
b)
B
c)
C
d)
D
22.
Which contains a pure substance? (Choose all)
a)
A
b)
B
c)
C
d)
D
23.
Which contains a mixture? (Choose all)
a)
A
b)
B
24.
Which contains a solid? (Choose all)
a)
A
b)
B
c)
C
d)
D
25.
Which contains only elements (no compounds)? (Choose all)
a)
A
b)
B
c)
C
26.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
27.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
28.
What makes elements and compounds different from mixtures? Elements & compounds-
a)
have a constant composition (pure substances)
b)
are made of gases
c)
Will not change when heated
d)
conduct electric current
29.
In the diagrams provided, the circles of different colors represent the atoms of different elements. Which diagram represents a mixture?
a)
I
b)
II
c)
III
d)
IV
30.
Which of these is true of fruits blended together?
a)
chemical change
b)
physical change
c)
both types of changes
d)
none of these
31.
Changes between states of matter are often which?
a)
chemical changes
b)
physical changes
c)
both
d)
neither
32.
what is the definition of physical change?
a)
any change that results in the formation of new chemical substances.
b)
rusting
c)
changes affecting the form of a chemical substance, but not its chemical composition.
d)
any property that is measurable, whose value describes a state of a physical system
33.
what is burning?
a)
physical change
b)
physical property
c)
chemical change
d)
chemical property
34.
which one is a chemical property?
a)
odor
b)
combustibility
c)
solubility
d)
all of the above
35.
what is condensing?
a)
physical property
b)
chemical property
c)
chemical change
d)
physical change
36.
One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?
a)
evaporation; chemical change
b)
condensation; physical change
c)
evaporation; physical change
d)
condensation; chemical change
37.
When you break a cracker into pieces it is a
a)
Chemical change
b)
Physical change
c)
Chemical Weathering
d)
Physical Weathering
38.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
39.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
40.
What is the definition of chemical change?
a)
any change that results in the formation of new chemical substances.
b)
changing clothes
c)
matter cannot be created or destroyed, only change form
d)
changes affecting the form of a chemical substance, but not its chemical composition.
41.
Is spoiled meat a chemical or physical change?
a)
chemical
b)
physical
42.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
43.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
44.
Which is NOT an indication of a chemical change?
a)
temperature change
b)
formation of a precipitate
c)
shape change
d)
production of light
45.
You know you a chemical reaction has occurred if
a)
there is a precipitate.
b)
there is a color change.
c)
there is a temperature change.
d)
All of these answers are evidence.
46.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
d)
The mass of the combined liquids is greater than either original liquid.
47.
What type of change do we see in when we melt ice?
a)
Physical Change
b)
Chemical Change
48.
Which of the following is an example of a chemical change?
a)
rusting of a bicycle
b)
painting a house
c)
washing a dog
d)
tearing up a newspaper
49.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
50.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
51.
Which of the following is a chemical change rather than a physical change
a)
boiling water at 100 C
b)
chopping up a piece of wood.
c)
cooking a cake
d)
ice carbon dioxide sublimating to gas
52.
A Precipitate forms
a)
when a gas is bubble through a liquid
b)
a lighter taper causes a gas to burn
c)
in a liquid or gas after a reaction and causes cloudiness (caused by a solid forming)
53.
An gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
54.
Which is the name of the kind of solid substance formed in this figure?
a)
aqueous
b)
precipitate
c)
acid
d)
synthesis
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