Reaction Pathways — Unit test

Question 1

What else is produced during the replacement reaction of magnesium and hydrochloric acid?Mg + 2HCl H2 + ________

Revolt · Accepted Answer

MgCl2

Question 2

An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below.BF3 + Li2SO3 B2(SO3)3 + LiFWhat is the coefficient of lithium fluoride in the balanced chemical reaction?

Revolt · Accepted Answer

6

Question 3

Which statement is usually true about the relationship between activation energy and reaction rates?

Revolt · Accepted Answer

High activation energy barriers result in low rates.

Question 4

Which type of reaction is Mg + S → MgS?

Revolt · Accepted Answer

synthesis

Question 5

Consider the reaction pathway graph below.Which of the following explains the importance of the activation energy acting as a barrier for reactants?

Revolt · Accepted Answer

It prevents most reactions from occurring spontaneously.

Question 6

Which statement is true about an empirical formula?

Revolt · Accepted Answer

It is the simplest ratio of atoms in a formula unit.

Question 7

Consider the reaction pathway graph below.What is represented by D in the graph?

Revolt · Accepted Answer

the activation energy

Question 8

What is the percent by mass of water in Na2SO4 • 10H2O?Use .

Revolt · Accepted Answer

55.92%

Question 9

The equation below shows a reaction that produces calcium carbonate.Ca(OH)2(s) + CO2(g) CaCO3(s) + H2O(l)Which describes a way to speed up the collisions between calcium hydroxide and carbon dioxide molecules to produce calcium carbonate faster?

Revolt · Accepted Answer

Reduce the volume of the container.

Question 10

Consider the equation for the formation of water.2H2 + O2 2H2OWhat is the theoretical yield of H2O if 130 g of H2O is produced from 18 g of H2 and an excess of O2?

Revolt · Accepted Answer

160 g

Reaction Pathways — Unit test Answers

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