Free Printable May 25, 2022

Worksheets

May 25, 2022 - Stoichiometry

Total questions: 21

Worksheet time: 29mins

Name

Class

Date

What is the percent by mass of sodium in NaCl?

39%

61%

35%

65%

What is the percent by mass of fluorine in CaF₂(gram-formula mass = 78 g/mol)?

24%

49%

51%

65%

Determine the number of moles of AlNO₃ that are in 264 g of the compound.

2.97 mol

3.45 mol

2.73 mol

1.86 mol

Determine the amount of moles in CuBr that are in 276.9 g of the compound.

3.2 mol

1.7 mol

2.1 mol

1.9 mol

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

Coefficient

Subscript

Atom

Equation

What is a coefficient?

The small number on the right of the chemical symbol.

The large number to the left of a formula.

ONE element replaces another in a compound.

Synthesis

Combustion

Single Replacement

Double Replacement

The red numbers in the image below represent ________

subscripts

coefficients

I don't know, and don't want to try

None of the answers are correct

The blue numbers in the image below represent ________

I don't know, and don't want to try

coefficients

subscripts

none of the answers are correct

10.

The substances at the beginning of a chemical equation are called the ____

product

yield

chemical symbol

reactants

11.

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂--> 2Al₂O₃

12.

What is the right part of a chemical equation called...

H_{2 +}O₂ --> H₂O

Reactants

Products

Yields

Chemical Equation

13.

Balance this equation
_N₂+ _H₂--> _NH₃

1,2,3

1,3,2

1,1,2

2,1,1

14.

Organic Compound +O₂--> H₂O + CO₂

Decomposition

Double replacement

Combustion

Single Replacement

15.

Find the percentage composition of Mg in Mg₃(PO₄)₂.

27.75% Mg

23.57% Mg

48.68% Mg

13.45% Mg

16.

What type of reaction is the equation C + O₂→ CO₂?

Synthesis Reaction

Decomposition Reaction

Single Displacement Reaction

Double Displacement Reaction

17.

Breaking down a substance into simpler substances

Displacement

Synthesis

Decomposition

Oxidation

18.

Si + S₈ --> Si₂S₄

Synthesis (combination)

Decomposition

Single replacement

Double replacement

19.

What is the left part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

Reactants

Yields

Products

Chemical equation

20.

Is the following equation balanced?

Al + O₂ ---> 2Al₂O₃

YES

21.

What type of reaction involves 2 substances combining to form 1 new compound?

Decomposition Reaction

Single Replacement Reaction

Double Replacement Reaction

Synthesis Reaction

Reset

May 25, 2022 - Stoichiometry

Total questions: 21

Worksheet time: 29mins

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