Unit 11

A 0.12M solution of an acid that ionizes only slightly in solution would be termed ____.

• strong base

• strong acid

• weak acid

• weak base

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?

• 1:3

• 2:3

• 1:2

• 3:2

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol

• 1.0 mol

• 10.1 mol

• 4.5 mol

Tags

NGSS.HS-PS1-7

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g

• 2.6 g

• 690 g

• 45 g

Tags

NGSS.HS-PS1-7

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield

• mole ratio

• actual yield

• percentage yield

Tags

NGSS.HS-PS1-7

When does a chemical reaction stop?

• When the lab is finished

• When the excess reactant is used up

• When the limiting reactant is used up

• Chemical reactions never stop

Tags

NGSS.HS-PS1-6

Complete the equation for the percent yield of a chemical reaction:

Percent yield=(________)÷(________)×100%

• experimental yield; theoretical yield

• theoretical yield; experimental yield

True or False. You must convert grams to moles in order to do stoichiometry.

• True

• False

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of Mg to moles Fe₂O₃?

• 1:3

• 2:3

• 1:2

• 3:1

Tags

NGSS.HS-PS1-7

O₂ −-> 2CO₂

How many liters of carbon dioxide at STP are produced from 10.0 L of carbon monoxide at STP?

• 10.0 L

• 20.0 L

• 5010 L

• 0.0199