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Chemistry/Chemical Reactions & Per Table

Total questions: 38

Worksheet time: 1hrs 7mins

Name
Class
Date
1.
How many atoms of chlorine are in Sn(ClO3)2?
a)
1
b)
2
c)
3
d)
6
2.
How many total atoms are in Sn(ClO3)2?
a)
1
b)
3
c)
6
d)
9
3.
Which type of evidence of a chemical reaction is best shown in the picture?
a)
Production of precipitate
b)
Production of gas
c)
Color change of a liquid
d)
Temperature change
4.
Which type of evidence of a chemical reaction is best shown in the picture?
a)
Production of precipitate
b)
Production of gas
c)
Color change of a liquid
d)
Temperature change
5.
Which would best be evidence a chemical reaction happened?
a)
The chemical you put in the refrigerator got colder 
b)
The two liquids you combined formed a solid
c)
The water you put in the freezer formed a solid
d)
The water you added green food coloring to turned green.
6.
Which one of these is a physical change?
a)
Ice melting
b)
Precipitate forming
c)
Burning a match
d)
Unexpected change in temperature
7.
Which describes a chemical reaction?
a)
A new substance is produced with different physical properties
b)
The same substances are present with different physical properties
8.
True or False: The products of a chemical reaction have the SAME physical properties as the reactants
a)
True
b)
False
9.
What is the coefficient in the following: 3Cl2
a)
3
b)
2
c)
6
d)
1
10.
How many atoms are in the products of this equation?
a)
1
b)
2
c)
3
d)
4
11.
How many atoms are in the reactants?
a)
6
b)
8
c)
2
d)
3
12.
According to the Law of Conservation of Mass, the mass of the reactants ___ the mass of the products
a)
equals
b)
is greater than
c)
is less than
d)
cannot equal
13.
How will the mass at the beginning of the experiment compare with the mass at the end of the experiment, assuming the system (flask) is CLOSED?
a)
Masses will be the same
b)
Masses will be different
14.
Burning paper is a -
a)
physical change
b)
chemical change
15.
When chemical bonds are broken and rearranged, you have seen a -
a)
physical change
b)
chemical change
16.
When salt dissolves in water, you have seen a -
a)
physical change
b)
chemical change
17.
When substances with different chemical properties are formed, you have seen a -
a)
physical change
b)
chemical change
18.
CO2 is a(n) - 
a)
element
b)
compound
19.
O2 is a(n) - 
a)
element
b)
compound
20.
We knew a precipitate formed in our lab, because we observed- 
a)
bubbles/fizzing
b)
color change
c)
a solid that sank to the bottom
d)
a temperature change
21.
Which is evidence of chemical change that happens in the candle?
a)
The burning wick
b)
The melted wax
22.

How many carbon atoms in Fe(HCO3)3

a)

1

b)

2

c)

3

d)

9

23.
When you add vinegar to baking soda, gas is produced and bubbles up. The mass AFTER all the bubbles stop will be - 
a)
less because some of the mass escaped the open system
b)
the same because the system was open
24.
How many atoms of tin are in Sn(ClO3)2?
a)
1
b)
2
c)
3
d)
6
25.
Which type of evidence of a chemical reaction is best shown in the picture?
a)
Production of precipitate
b)
Production of gas
c)
Color change of a liquid
d)
Temperature change
26.
Which type of evidence of a chemical reaction is best shown in the picture?
a)
Production of precipitate
b)
Production of gas
c)
Color change of a liquid
d)
Temperature change
27.

Q. From a laboratory process designed to separate water into hydrogen and oxygen gas, a student collected 10.0g of hydrogen and 80.0g of oxygen. How much water was originally involved in the process?

a)

60.0g

b)

70.0g

c)

80.0g

d)

90.0g

28.
4 grams of hydrogen and 32 grams of oxygen will combine to form:
a)
36 grams of water
b)
28 grams of hydroxide
c)
32 grams of oxygen
29.

In the equation, 46 grams of sodium (Na) reacted with 36 grams of water (H2O). If 2 grams of hydrogen gas (H2) are produced by this reaction, what is the mass of sodium hydroxide (NaOH) produced?

a)

10 grams

b)

44 grams

c)

80 grams

d)

82 grams

30.

In this chemical equation , CH4 and 2O2 are called the...

a)

Products

b)

Reactants

c)

Coefficient

d)

Subscript

31.

There are 4 hydrogens in the products of the equation. How many hydrogens would you expect in the reactants?

a)

1

b)

3

c)

4

d)

5

32.
The following chemical reaction occurs:
2S + 3O2 -> 2SO3
How many atoms of oxygen are there in the reactant?
a)
2 atoms of oxygen
b)
3 atoms of oxygen
c)
6 atoms of oxygen
d)
1 atom of oxygen
33.

What happens to the number of atoms as it goes through a chemical reaction

a)

Doubles

b)

Changes

c)

Stays the same

34.
Atoms with similar properties are most likely located...
a)
in the same period.
b)
in the same group.
c)
in different periods.
d)
to the right and left of each other.
35.

If an atom had the same chemical properties (reactivity) as fluorine (F), it would probably be located in

a)

period 1.

b)

period 2.

c)

group 2.

d)

group 17.

36.

Elements in the same period have the --

a)

same number valence electrons

b)

same number energy levels

c)

same chemical properties

d)

same colors

37.

Which element would have 1 valence electron? USE Periodic Table!!

a)

Cs

b)

He

c)

Si

d)

I

38.

How many valence electrons would an element in group 13 (3A) have?

a)

13

b)

3

c)

1

d)

can't tell from this information

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