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WorksheetsReview of Chemistry Unit
Total questions: 32
Worksheet time: 1hrs 15mins
Name
Class
Date
1.
How many valence electrons does Krypton have?
a)
36
b)
18
c)
8
d)
4
2.
How many valence electrons does Sulfur
a)
16
b)
32
c)
6
d)
3
3.
How many valence electrons does sodium have?
a)
1, stable
b)
11, reactive
c)
1, reactive
d)
11, stable
4.
How many valence electrons does magnesium have?
a)
12, stable
b)
2, reactive
c)
12, reactive
d)
2, stable
5.
Most of the elements to the LEFT of the zig-zag line are:
a)
metals
b)
metalloids
c)
non-metals
d)
noble gases
6.
Which element is a metalloid?
a)
Aluminum
b)
Silicon
c)
Nitrogen
d)
Lead
7.
Elements in the same ________ are more chemically similar.
a)
group
b)
period
c)
club
d)
table
8.
Which of the following is not a property of metals?
a)
brittle
b)
malleable
c)
lustrous
d)
conductive
9.
Which elements have the most similar chemical properties?
a)
K and Na
b)
K and Ca
c)
K and Cl
d)
K and S
10.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
c)
liquid properties
d)
real properties
11.
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
12.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
13.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
14.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
15.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
16.
Photosynthesis is an example of a
a)
physical change
b)
chemical change
17.
When materials combine to form new compounds it is a chemical change. Which example is a chemical change?
a)
baking powder fizzing
b)
water boiling
c)
ice melting
d)
sugar cube dissolving
18.
If you break a piece of glass, the shape of the glass changes, but the properties in the fragments remain the same. Which of the following has occurred?
a)
A chemical change.
b)
A temperature change.
c)
A phase change.
d)
A physical change.
19.
Which process is a physical change?
a)
Rusting iron
b)
Burning coal
c)
Tarnishing silver
d)
Melting ice
20.
A group of students investigated physical and chemical changes using paper. The students recorded their observations in a table.
Which student correctly recorded all the changes that took place?
Which student correctly recorded all the changes that took place?
a)
Student 1
b)
Student 2
c)
Student 3
d)
Student 4
21.
The smell made from a decomposing fish.
a)
Chemical Change
b)
Physical Change
22.
Green bananas turning yellow on their own as they ripen.
a)
Chemical Change
b)
Physical Change
23.
An gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
24.
A copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
c)
Chemical Property
d)
Physical Property
25.
What is an example of a physical property?
a)
reactivity
b)
color
c)
flammability
d)
oxidation
26.
Which is an example of a chemical reaction?
a)
paper cut into small pieces
b)
chocolate melting in a pan
c)
flour and sugar mixed in a bowl
d)
cookies baking in an oven
27.
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
28.
Which of the following characteristics is shared by all chemical reactions?
a)
Produce a precipitate
b)
Show a color change
c)
Release heat energy
d)
Form new substances
29.
All of the following are evidence of a chemical change EXCEPT-
a)
change in state of matter
b)
formation of a gas
c)
color change
d)
precipitate forms
30.
Which of the following observations is the best indicator that a new substance has been formed?
a)
A solid has become a liquid.
b)
A substance has changed color.
c)
A solid has dissolved in a liquid.
d)
The volume of a substance increased.
31.
Looking at the periodic table what other element reacts in a similar way to Si?
a)
Al
b)
P
c)
C
d)
H
32.
The outer most negatively charged particles of an atom are known as what?
a)
electrons
b)
protons
c)
neutrons
d)
valance electrons
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