CHEM REV 1 - ATOMIC STRUCTURE AND PERIODIC TABLE

Magnesium is a metal in Group 2. What is the charge of a magnesium ion?

• One positive

• Two positive

• One negative

• Two negative

How many atoms of oxygen are there in one molecule of carbon dioxide?

• 1

• 2

• 3

• 4

What does the word equation for the reaction between potassium hydroxide and sulfuric acid produce?

• Potassium hydroxide + sulfuric acid → sulfuric acid + water

• Potassium hydroxide + sulfuric acid → potassium sulfate + hydrogen

• Potassium hydroxide + sulfuric acid → potassium sulfate + water

• Potassium hydroxide + sulfuric acid → potassium chloride + water

What does the state symbol (s) indicate in a chemical equation?

• Science

• Solution

• Solid

• Several

According to the law of conservation of mass, what must be true about a chemical reaction?

• The total mass of the reactants is less than the total mass of the products.

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is equal to the total mass of the products.

• The total mass of the reactants and products is not conserved.

What does a balanced symbol equation have an equal number of on both sides of the arrow?

• Molecules

• Atoms of each element

• Compounds

• Mixtures

What is a pure substance in chemistry?

• A substance consisting of two or more elements chemically joined together

• A substance consisting of two or more different substances not chemically joined together

• A substance consisting of only one element or one compound

• A substance that can be separated by physical processes

What is a mixture in chemistry?

• A substance consisting of only one element or one compound

• A substance that changes the chemical properties of the substances that are in it

• A substance consisting of two or more different substances, not chemically joined together

• A substance that can only be separated by chemical reactions

What is the purpose of filtration in chemistry?

• To separate a soluble solid from a liquid

• To separate an insoluble solid from a liquid

• To produce solid crystals from a solution

• To change the chemical properties of a substance

What is the purpose of simple distillation?

• To separate a solute from a solvent

• To separate different liquids from a mixture of liquids

• To separate different fractions from crude oil

• To separate a solvent from a solute