Ch.3: Chemical Reactions (Part I)

A chemical equation is

• the representation of a chemical change by using symbols and formulae

• the representation of a physical change

• the representation of an element

• the representation of a compound

• N₂ and H₂ are the reactants

• NH₃ is the product

• The equation is balanced

• Two molecules of NH₃ can be formed when three molecules of H₂ are consumed in this reaction.

• All the above.

• 2, 2, 2

• 2, 1, 2

• 1, 1, 1

• 1, 2, 3

• combination

• decomposition

• combustion

• all of the above

One mole of water is equivalent to

• 18.0 g water

• All of the above.

How many moles of carbon dioxide, CO₂ are produced when 10 moles of methane, CH₄ are consumed?

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

• 5

• 2

• 10

• 1

• 4

What is the molar mass (in g/mol) of glucose, C₆H₁₂O₆?

Atomic masses (g/mol): C 12.01, H 1.01, O 16.00

• 116.08

• 58.04

• 29.02

• 180.18

How many moles of water are present in 1.0 mL of water?

molar mass of water = 18.02 g/mol

density of water = 1.0 g/mL

• 1.5

• 1

• 55

• 5.5

• 0.055

• 1100

How many oxygen atoms are present in 0.10 moles of glucose, C₆H₁₂O₆?