Solubility — Unit test

Question 1

Which statement best describes the difference between endothermic and exothermic reactions?

Revolt · Accepted Answer

They are opposites because endothermic reactions require energy and exothermic reactions release energy.

Question 2

Which is a pure substance?

Revolt · Accepted Answer

nitrogen

Question 3

Rolf prepares four solutions using different solutes as shown in the table below.Which solution is unsaturated?

Revolt · Accepted Answer

Solution A

Question 4

In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?

Revolt · Accepted Answer

54 g

Question 5

Which describes how a centrifuge separates a mixture?

Revolt · Accepted Answer

It spins a sample to separate based on density.

Question 6

Zora wants to dissolve a solute in a solvent quickly. Which best describes what she should do?

Revolt · Accepted Answer

shake it repeatedly

Question 7

Which best represents the reaction of calcium and zinc carbonate (ZnCO3) to form calcium carbonate (CaCO3) and zinc?

Revolt · Accepted Answer

Ca + ZnCO3 → CaCO3 + Zn

Question 8

Which separation procedure is most likely to happen?

Revolt · Accepted Answer

Filtering a mixture will separate it into substances.

Question 9

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

Revolt · Accepted Answer

MgCl2

Question 10

Which statement best describes balancing equations and the law of conservation of mass?

Revolt · Accepted Answer

The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.

Solubility — Unit test Answers

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