مصطلحات التشابتر الاول والثاني

Question 1

is the study of matter and the changes it undergoes

Answer 1

Chemistry

Question 2

is anything that occupies space and had mass.

Answer 2

Matter

Question 3

is a form of matter that has definite
composition and distinct properties.

Answer 3

Substance

Question 4

is a combination if two or more substance in which the substances retain their distinct identities.

Answer 4

Mixture

Question 5

composition of the mixture is the same throughout.

Answer 5

Homogenous mixture

Question 6

composition is not uniform throughout.

Answer 6

Heterogeneous mixture

Question 7

can be used to separate a mixture into its pure components without changing the identities of the
components.

Answer 7

Physical means



Question 8

is a substance that cannot be separated into simpler substances by physical or chemical means.

Answer 8

Element

Question 9

is a substance composed of atoms of two or more elements chemically united in fixed proportions.

Answer 9

Compound

Question 10

can be measured and observed without changing the composition or identity of a substance.

Answer 10

Physical property

Question 11

is a property that requires carrying out a chemical change in order to be observed.

Answer 11

Chemical property

Question 12

does not alter the composition or identity of a substance.

Answer 12

Physical change

Question 13

alters the composition or identity of the substance(s) involved.

Answer 13

Chemical change

Question 14

a material depends on how much matter is being considered.

Answer 14

Extensive property

Question 15

a material does not depend upon how much matter is being considered.

Answer 15

Intensive property

Question 16

international system of units.

Answer 16

SI

Question 17

SI derived unit for it is cubic meter (m3).

Answer 17

Volume

Question 18

SI derived unit for it is the kilogram per cubic meter (kg/m3).

Answer 18

Density

Question 19

are composed of atoms of more than one element.

Answer 19

Compound

Question 20

is the basic unit of an element that can enter into
chemical combination

Answer 20

Atom

Question 21

number of protons in nucleus

Answer 21

Atomic number (Z)

Question 22

number of protons + number of neutrons
= atomic number (Z) + number of neutrons

Answer 22

Mass number (A)

Question 23

are atoms of the same element (X) with different numbers of neutrons in their nuclei

Answer 23

Isotopes

Question 24

noble gases exists as single atoms

Answer 24

monoatomic

Question 25

is an aggregate of two or more atoms in a definite arrangement held together by chemical forces

Answer 25

Molecule

Question 26

contains only two atoms

Answer 26

diatomic molecule

Question 27

contains more than two atoms

Answer 27

polyatomic molecule

Question 28

is an atom, or group of atoms, that has a net positive or negative charge.

Answer 28

Ion

Question 29

ion with a positive charge, loses one or more electrons

Answer 29

Cation

Question 30

ion with a negative charge, gains one or more electrons

Answer 30

Anion

Question 31

contains only one atom

Answer 31

Monatomic ion

Question 32

contains more than one atom

Answer 32

polyatomic ion

Question 33

shows the exact number of atoms of each element in the smallest unit of a substance

Answer 33

Molecular formula

Question 34

shows the simplest whole-number ratio of the atoms in a substance

Answer 34

Empirical formula

Question 35

consist of a combination of cations and an anions

Answer 35

ionic compounds

Question 36

Indicate charge on metal with Roman numerals (I, II, III, ..)

Answer 36

Transition metal ionic compounds

Question 37

a substance that yields hydrogen ions (H+) when dissolved in water.

Answer 37

Acid

Question 38

acid that contains hydrogen, oxygen, and another element.

Answer 38

Oxoacid

Question 39

a substance that yields hydroxide ions (OH-) when dissolved in water.

Answer 39

Base

Question 40

are compounds that have a specific number of water molecules attached to them.

Answer 40

Hydrates