quizizz review 1 (chem)

When 12 moles of O2 reacts with 1.1 mole of C10H8 what is the limiting reactant? C10H8 + 12 O2 --> 10 CO2 + 4 H2O

Oxygen

What is the measured amount of a product obtained from a chemical reaction?

actual yield

Balance this equation. _Mg + _Cl2 --> _MgCl2

already balanced

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

10.1 mol

Fe (s) + S (l) --> FeS (s) In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.How much FeS is formed?

12.2 g

B2H6 + 3O2 -->2 HBO2 + 2 H2O What mass of O2 will be needed to burn 36.1 g of B2H6?

124 g O2

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

2, 2, 1

Balance this equation _Al +_HCl --> _H2 +_AlCl3

2, 6, 3, 2

Cl2 + 2 KBr → Br2 + 2 KCl How many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?

223 g

O2 + CS2 --> CO2 + SO2 What coefficient would go in front of the O2?

3

WO3 + H2 --> W + H2O What coefficient goes in front of H2?

3

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

3 mol MgO / 2 mol Fe

2H2 + O2 → 2H2O How many moles of oxygen are consumed if 8 moles H2 are used?

4

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

5.2 g

2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g) 12.00 moles of NaClO3 will produce how many grams of O2?

576 g of O2

What is the percent yield of the following reaction if 145g of P2O5 reacts with 40 grams of water, but you only collected 112 grams of phosphoric acid? 3 H2O + P2O5 -> 2H3PO4

77%

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

82%

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl2.Mg + 2HCl --> MgCl2 + H2

HCl

When does a chemical reaction stop?

When the limiting reactant is used up

What is the first thing you must do to solve a stoichiometry problem?

Write a Balanced Equation

A chemist interested in the efficiency of a chemical reaction would calculate the

percent yield

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

What is a Excess Reagent?

what you have left over

WO3 + H2 --> W + H2O What coefficient goes in front of H2?

yes