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Chemical Reactions Quiz: MCQ Exam! 13

Chemical Reactions Quiz: MCQ Exam! 13

Chemical Reactions Quiz: MCQ Exam!

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{font-size:149%;} Balance the following equation: Ag + 02 --> Ag20

Put a 2 in front of Ag
Add a 4 in front of Ag and a 2 in front of Ag20
Add a subscript 2 to the end of Ag20
Add a 2 in front of Ag and a 1 in front of Ag20

{font-size:149%;} The reactants include 7 grams of C and 4 grams of O. What is the total amount of C and O in the products?

7gram
4gram
None
11 grams

{font-size:149%; } If iron combines with oxygen to make iron oxide, the reactants are...

Iron oxide
Iron and iron oxide
Iron and oxygen
Oxygen and iron oxide

{font-size:149%;} Which one of the following is a chemical equation?

Ice + heat --> water
water Iron + oxygen --> rust
C + 02 --> CO2
CO2

To balance a chemical equation, you should change only the...

Subscripts
Coefficients
Location of the arrow
Chemical formulas

Which one of the following represents a physical change?

Iron rusting
Paper burning
Dynamite exploding
Water freezing

How many carbon atoms are there in C12H22011?

6
12
45
18

{font-size:149%;} You can tell a chemical reaction because it always produces ...

A different substance
Reactants
A change of state
Water

How many oxygen atoms are in the product of this equation: 2H2 + 02 --> 2H2O

2
4
7
8

{font-size:149%;} In a chemical equation, the arrow means what?

A reaction is happening.
The two sides are equal.
The equation is balanced.
The products flow into reactants.
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