Unit 2 Chemistry RO

Question 1

Atoms

Answer 1

the basic unit of a chemical element.

Question 2

Molecules

Answer 2

a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

Question 3

Substances

Answer 3

a particular kind of matter with uniform properties.

Question 4

Homogenous mixtures

Answer 4

a gaseous, liquid or solid mixture that has the same proportions of its components throughout a given sample.

Question 5

Heterogeneous Mixtures

Answer 5

a mixture in which the composition is not uniform throughout the mixture.

Question 6

Chemical properties

Answer 6

a characteristic of a particular substance that can be observed in a chemical reaction.

Question 7

Physical properties

Answer 7

a characteristic of a substance that can be observed or measured without changing the identity of the substance.

Question 8

Isotopes

Answer 8

Atoms with the same number of protons but different numbers of neutrons.

Question 9

Compounds

Answer 9

a thing that is composed of two or more separate elements; a mixture.

Question 9

Elements

Answer 9

a substance made up of only one type of atom, each with the same number of protons.

Question 10

Reactants

Answer 10

the starting materials in a reaction that undergo a chemical change to form a product

Question 11

Products

Answer 11

the species formed from chemical reactions.

Question 12

Hydrogen Bonds

Answer 12

The hydrogen bond is the eminently electrostatic attractive force between an electronegative atom and a hydrogen atom.

Question 13

Covalent Bonds

Answer 13

Is the interatomic linkage that results from the sharing of an electron pair between two atoms.

Question 14

Cation

Answer 14

a positively charged ion.

Question 14

Ionic Bonds

Answer 14

formed between two or more atoms by the transfer of one or more electrons between atoms.

Question 15

Periodic Table- Groups

Answer 15

a column in the periodic table of the chemical elements.

Question 16

Anion

Answer 16

an atom that has more electrons than protons.

Question 17

Periodic Table Rows

Answer 17

periods or series.

Question 18

Valence Electrons

Answer 18

a single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom.

Question 19

PH Scale

Answer 19

a measure of how acidic/basic water is.

Question 20

Acids

Answer 20

a chemical substance, usually a liquid, which contains hydrogen and can react with other substances to form salts.

Question 21

Bases

Answer 21

a substance that reacts with an acid in an acid-base reaction.