Lifepac Grade 10 Unit 2 Science

Front 1

Atoms are composed of ____, ________, and _______

Back 1

protons neutrons and electrons

Front 2

The smallest particle of an element is an

Back 2

atom

Front 3

Atomic mass is determined by the ________ plus ________

Back 3

protons plus neutrons

Front 4

Atomic number is the number of an atom's _______

Back 4

protons

Front 5

What is the formula to find the amount of neutrons in an atom?

Back 5

mass number minus atomic number

Front 6

The smallest unit of a compound is a

Back 6

molecule

Front 7

A molecule of one atom of carbon and two atoms of oxygen would be written

Back 7

CO2

Front 8

water is an example of a

Back 8

compound

Front 9

Few elements exist as free

Back 9

atoms

Front 10

The 3 subatomic particles are

Back 10

electrons protons and neutrons

Front 11

Of the 3 parts of the atom, the _______ carries no electrical charge

Back 11

neutron

Front 12

The part of the atom that carries a negative charge is the

Back 12

electron

Front 13

The part of the atom that carries a positive charge is the

Back 13

proton

Front 14

The mass of an atom is contained primarily in its

Back 14

nucleas

Front 15

Atomic mass is determined by the ________ plus _______

Back 15

protons plus neutrons

Front 16

The number of protons determines the

Back 16

atomic number

Front 17

Atoms are electrically neutral because they have the same number of ____________ as ___________

Back 17

protons as electrons

Front 18

The principal elements in living things are ______, _______, _______, and ________

Back 18

hydrogen, carbon, nitrogen, and oxygen

Front 19

The number of hydrogen atoms in a molecule of NH3 is

Back 19

3

Front 20

define compound

Back 20

A chemical substance composed of atoms of 2 or more elements chemically bonded to one another

Front 21

define molecule

Back 21

A unit of matter composed of 2 or more atoms held together by chemical bonds

Front 22

define energy level

Back 22

The path surrounding the nucleus of an atom in which electrons are normally located

Front 23

define element

Back 23

Building blocks of matter

Front 24

define mixture

Back 24

2 or more substances mixed together but not chemically combined

Front 25

Atoms of different elements may have identical

Back 25

charges

Front 26

Under what condition of its outer energy level will an atom give up electrons?

Back 26

When it has less than half of an energy level full

Front 27

define hydrogen bond

Back 27

weak chemical bond when a hydrogen atom is shared by 2 adjacent molecules

Front 28

define covalent bond

Back 28

chemical bond formed between 2 atoms by sharing electrons

Front 29

define ionic bond

Back 29

bond formed by electrical attraction between 2 oppositely changed ions

Front 30

Atoms with 3,4, or 5 electrons in their outer energy levels have ______(little/great) tendency to form ions

Back 30

little

Front 31

Atoms with the greatest tendency to form negative ions have _____ electrons in their outer shells.

Back 31

7

Front 32

The first energy level of an atom contains a maximum of _____ electrons

Back 32

8