Physical Science mid term vocab (matching/fill in the blank/true or false)

Question 1

ion

Answer 1

atom or group of atoms that has an electric charge

Question 2

ionic bond

Answer 2

the attraction between positive and negative ions

Question 3

matter

Answer 3

anything that has mass and takes up space

Question 4

elements

Answer 4

simplest pure substances and they cant be broken down into any other substances.

Question 5

compound

Answer 5

pure substance made of two or more elements that are combined chemically in a specific ratio ie. sodium chloride

Question 6

mixture

Answer 6

two or more substances-elements, compounds, or both- that are in the same place, but are not chemically combined. examples- air, soil, wood

Question 7

atom

Answer 7

smalllest particle of an element

Question 8

valence electrons

Answer 8

highest energy level and are held most loosley

Question 9

motion

Answer 9

state in which one’s distance from another is changing

Question 10

reference point

Answer 10

a place or object used for comparison to determine if an object is in motion

Question 11

international system of units

Answer 11

a system of measurement based on multiples of ten and on established measures of mass, length, and time

Question 12

slope

Answer 12

steepness of a line on a graph, equal to its vertical change divided by its horizontal change

Question 13

precipitate

Answer 13

A solid that forms from a solution during a chemical reaction.

Question 14

molecule

Answer 14

A group of atoms bonded together

Question 15

endothermic reaction

Answer 15

A reaction in which energy is absorbed in the form of heat

Question 16

exothermic reaction

Answer 16

A reaction that releases energy in the form of heat

Question 17

covalent bond

Answer 17

A chemical bond formed when two atoms share electrons

Question 18

Law of Conservation of Mass

Answer 18

Matter is not created nor destroyed in any chemical or physical change

Question 19

balanced force

Answer 19

The forces pushing (or pulling) an object in one direction are the same size as the forces acting in the opposite direction –> the object will not move

Question 20

unbalanced force

Answer 20

The forces on an object are pushing harder in one direction than in another, causing movement

Question 21

net force

Answer 21

The total (or sum) of all forces acting on an object

Question 22

Newton

Answer 22

The unit of measurement for force

Question 23

force

Answer 23

Something that does work or causes a change (basically, a push or a pull)

Question 24

energy level

Answer 24

the specific amount of energy an electron has

Question 25

polyatomic ion

Answer 25

an ion that is made of more than one atom

Question 26

open system

Answer 26

a system in which matter can enter from or escape to the surrounding

Question 27

closed system

Answer 27

a system in which not matter is allowed to enter or leave

Question 28

activation energy

Answer 28

the minimum amount of energy needed to get a chemical reaction started

Question 29

concentration

Answer 29

the amount of one material in a certain volume of another material.