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Chem Review

Total questions: 43

Worksheet time: 59mins

Name
Class
Date
1.
In a chemical equation, is it true that -
a)
the reactant side and product side can have different numbers of atoms for each element
b)
there can be different elements on the reactant side and the product side
c)
an element or compound must be accompanied by a phase change
d)
the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made
2.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
3.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
4.

How many atoms in all are in a molecule of serotonin?

C10H12N2O

a)
22
b)
24
c)
25
d)
4
5.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
6.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
7.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
8.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
9.
Is a a rusting bicycle a chemical or physical change?
a)
chemcial
b)
physical
10.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
11.
Is melting ice a chemical or physical change?
a)
chemical
b)
physical
12.
Is spoiling food a physical or chemical change?
a)
phyiscal
b)
chemical
13.
Is mixing lemonade powder with water a physical or chemical change?
a)
physical
b)
chemical
14.
Is mowing the lawn a phyiscal or chemical change?
a)
physical
b)
chemical
15.
Which of the following equations demonstrates an actual chemical reaction that forms a new substance? (HINT: it must follow the Law of Conservation of Mass)
a)
A
b)
B
c)
C
d)
D
16.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
17.
Is this balanced?
2HgO → 2Hg + O2
a)
Yes
b)
No
18.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
19.
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
20.
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
21.

Which is NOT an example of chemical change?

a)

production of gas.

b)

change in color.

c)

change in size.

d)

transfer of energy.

22.

For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and wrote down the changes. Which change shows that a CHEMICAL REACTION took place?

a)

A dark solid (precipitate) formed on the zinc metal.

b)

The zinc metal stayed silver-colored and shiny

c)

The CuSO4 solution evaporated after the zinc metal was added.

d)

None of these

23.

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

a)

The shape of the coal changes

b)

Oxygen is present

c)

A new substance is produced

d)

Coal is made up of more than one element

24.
How is a physical change different from a chemical change?
a)
There is absolutely no difference
b)
Chemical changes produce a new substance, physical changes stay the same substance
c)
Chemical changes create and destroy matter, physical changes don't
d)
Physical changes create and destroy matter, chemical changes dont
25.

A student listed how different parts of the body work to aid in the digestion of food.

Which of the following is a chemical change that occurs to the food?

a)

The food particles break into smaller pieces as food is chewed

b)

The movement of food to the stomach after food is swallowed

c)

The breakdown of molecules of food by enzymes and acid in the stomach to form new substances

d)

None of the above

26.

what is an atom

a)

smallest part of the universe

b)

smallest part of a substance

c)

smallest part of anything

d)

smallest part of water

27.

protons

a)

negative charge, nucleus

b)

positive charge, shells

c)

positive charge , nucleus

d)

neutral charge, nucleus

28.

electrons

a)

no charge, nucleus

b)

positive charge, nucleus

c)

negative charge, shells

d)

negative charge, nucleus

29.

How many atoms of sodium (Na) are in one molecule of baking soda?

a)

1

b)

2

c)

3

d)

4

30.

How many atoms make up one molecule of laughing gas?

a)

1

b)

2

c)

3

d)

4

31.

Pure substance that consists entirely of one type of atom.

a)

Solution

b)

Mixture

c)

Compound

d)

Element

32.

Elements have the most similar properties if they are in the same _______?

a)

Periods

b)

Groups

c)

Rows

d)

Blocks

33.
Gold is an example of a(n) 
a)
pure element
b)
pure compound
c)
pure mixture
34.
Which of the following has a full valence shell?
a)
Oxygen
b)
Neon
c)
Barium
d)
Carbon
35.

If a chemical reaction ends up with 6 hydrogen atoms, how many hydrogen atoms were present at the start of this chemical reaction.

a)

1

b)

12

c)

6

d)

3

36.

Horizonal rows (left and right) in the periodic table are called?

a)

Group

b)

Period

37.

Vertical columns (up and down) in the periodic table are called?

a)

Group

b)

Period

38.

What is the name of the Family in Group 1? (Lithium is at the top)

a)

Alkline Earth Metal Family

b)

Alkali Metal Family

c)

Noble Gasses Family

39.

The periodic table is organized alphabetically?

a)

True

b)

False

40.

Which is an uncharged subatomic particle present in the nucleus of atoms?

a)

Proton

b)

Neutron

c)

Electron

d)

Substance

41.

Which is a homogeneous mixture?

a)

pizza

b)

vinegar

c)

concrete

d)

woven fabric

42.
A copper penny turning greenish after a few years is an example of ...
a)
Chemical Change
b)
Physical Change
43.

In this chemical equation, the elements in red are the_______.

a)

Products

b)

Reactants

c)

Subscripts

d)

Coefficients

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