Free Printable Chemical Reactions Review

Worksheets

Chemical Reactions Review

Total questions: 25

Worksheet time: 27mins

Name

Class

Date

An oreo cookie has a mass of 20 grams. It gets crushed into crumbs for a recipe. What is the mass of the crumbs?

15 grams

25 grams

20 grams

If reaction starts with 20g of reactants, it will produce ---

a total of 40g of product

a total of 10g of product

a total of 80 g of product

a total of 20g of product

How many of each type of atom are in the formula NH₃?

1 nitrogen, 3 hydrogen

3 nitrogen, 3 hydrogen

1 neon, 3 hydrogen

1 nitrogen, 3 helium

How many molecules are represented in the formula 3CO₂?

3 carbon, 2 oxygen

6 carbon dioxide

3 carbon dioxide

3 carbon, 6 oxygen

In a reaction A + B ----> C.

Reactant A has 5g and product C has 9g.

How many grams does reactant B should have?

14g

If there are 4 H atoms on the reactant side, how many H atoms will be on the product side?

You need more information to answer this question

Water is heated and changed to steam ________________

Physical Change

Chemical Change

Which of the following is a sign that a chemical reaction has occurred?

change in shape

melting

formation of a gas

dissolving

Is melting butter for popcorn a chemical or physical change?

chemical

physical

10.

Which of the following is NOT an example of a physical change?

crumpled paper

pencil sharpening

shrunken clothing

rust

11.

A change where one or more new substances are created.

Physical Change

Chemical Change

12.

Change in color is a physical change.

True

False

13.

A copper penny turning greenish after a few years is an example of ...

Chemical Change

Physical Change

14.

Which of the following is NOT an example of chemical change?

sour milk

burning wood

breaking a pencil

rust

15.

Which of the following is NOT an example of a physical change?

crumpled paper

pencil sharpening

shrunken clothing

sour milk

16.

What is a coefficient?

The small number on the right of the chemical symbol.

The large number to the left of a formula.

17.

Which side of a chemical equation is the product side?

Left (before the arrow)

Right (after the arrow)

18.

Which side of a chemical equation is the reactant side?

Left (before the arrow)

Right (after the arrow)

19.

Which problem is balanced?

PbO₂ + 2H₂

SO₂ + H₂0 --> H₂SO₄

2Na + 2H₂O --> 2NaOH + H₂

20.

Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

Yes

21.

What is the little number after an element in a chemical equation called.
Example: H₂

Coefficient

Subscript

Atom

Equation

22.

Balance this equation
_Zn+_HCl-->_ZnCl₂+_H₂

1,1,2,1

1,1,1,2

1,2,1,1

2,1,1,1

23.

Balance this equation.
_Mg + _Cl₂--> _MgCl₂

1, 2,1

already balanced

2,1,1

1,1,2

24.

What does the Law of Conservation of Mass state?

Matter cannot be gained or lost in a chemical reaction.

Matter can only be lost in a chemical reaction.

Matter can only be gained in a chemical reaction.

Matter can be gained and lost in a chemical reaction.

25.

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

2, 2, 1

2, 3, 2

1, 2, 2

1, 3, 1

100 %

Chemical Reactions Review

Total questions: 25

Worksheet time: 27mins

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