5 Written Questions

1. the reactant that is used up first in a chemical reaction
2. a number placed in front of a chemical formula to make the number of atoms on each side of a chemical equation equal
3. a highly acidic substance your stomach normally produces to help you break down food
4. substance formed when one of the compounds in a double-displacement is insoluble, or doesnt dissolve in water
5. the breaking of bonds to form new substances

5 Matching Questions

1. atomic theory
2. valence shell electrons
3. single-displacement
4. malleability
5. insoluble

1. a a term to describe a substance that does not dissolve in water
2. b a reaction in which one element replaces a similar element in a compound
3. c states that all matter is composed of tiny particles called atoms
4. d the electrons in an atom that are involved in the formation of chemical bonds
5. e a solid's ability to be pounded into thin sheets

5 Multiple Choice Questions

1. a subatomic particle in an atom that is negatively charged and that occupies the energy levels in an atom; they are involved in chemical bonds and reactions
   1. elements
   2. electrons
   3. neutron
   4. proton
2. a type of chemical bond between atoms that gained or lost electrons
   1. neutron
   2. ionic bond
   3. covalent bond
   4. chemical bond
3. forms of the same element that have different numbers of neutrons and different mass numbers
   1. isotopes
   2. proton
   3. octet
   4. ion
4. a measure of how much pulling or tension a material can withstand before breaking
   1. neutron
   2. elasticity
   3. electrons
   4. tensile strength
5. a reaction in which a substance combines with oxygen releasing large amounts of energy in the form of heat and light
   1. addition
   2. combustion
   3. decomposition
   4. neutron

5 True/False Questions

1. react → describes how atoms interact when forming a chemical bond with another atom

   True        False

2. mass number → occurs when the number and type of atoms on the reactant's and product's sides of a chemical reaction are equal

   True        False

3. addition → a subatomic particle identical with the nucleus of the hydrogen atom

   True        False

4. heterogeneous mixture → a mixture in which every sample of it has the same composition

   True        False

5. chemical equation → chemical formulas and symbols that represent a chemical reaction

   True        False