Chemistry

Question 1

Molecules

Answer 1

A group of atoms joined together to act as a single unit

Question 2

Heterogeneous mixture/suspension

Answer 2

You can see the different parts

Question 3

Homogeneous mixture/ solution

Answer 3

You can’t see the different parts

Question 4

Weight

Answer 4

The measure of the force of gravity on an object

Question 5

Mass

Answer 5

The measurement of an amount of matter in an object

Question 6

Volume

Answer 6

The amount of space that matter occupies

Question 7

Volume formula

Answer 7

Length x width x height= volume

Question 8

Density

Answer 8

The mass of a material in a given volume

Question 9

Density formula

Answer 9

Mass
_____ = density

Volume

Question 10

Physical change

Answer 10

A change that alters the form or appearance of the matter (but no substance in the matter becomes a different substance)

Question 11

Chemical change

Answer 11

A change in matter that produces one or more new substances

Question 12

Atom

Answer 12

The basic particle from which all elements are made

Question 13

Characteristic properties

Answer 13

State at different temps, boiling, melting, freezing point, hardness, texture, flammability, size, color, density

Question 14

4 signs of a chemical change

Answer 14

Bubbles, precipitate, color change, temp change

Question 15

Pure substances

Answer 15

Made of only one kind of matter, has definite properties

Question 16

Element

Answer 16

A pure substance that cannot be broken down into other substances

Question 17

Compound

Answer 17

Pure substance, made of 2 or more elements that are chemically combined

Question 18

Mixtures

Answer 18

Consists of 2 or more substances that are in the same place but not chemically combined

Question 19

Solvent

Answer 19

The part of the solution present in the largest amount

Question 20

Solute

Answer 20

part in the smaller amount

Question 21

Saturated

Answer 21

Where so much solute has been added that no more dissolves

Question 22

Concentrated

Answer 22

More of the solute is dissolved into the solution

Question 23

Weight formula

Answer 23

Mass in kg x 9.8 m/s2= N

Question 24

Chemical equation

Answer 24

A shorter easier way to show chemical reactions using symbols

Question 25

Symbol

Answer 25

A 1-2 letter set of characters used to identify an element

Question 26

Chemical formula

Answer 26

Represent compounds

Question 27

Subscript

Answer 27

Used to represent the number of atoms of each kind in a compound

Question 28

Chemical reaction

Answer 28

when a chemical change takes place

Question 29

Chemical bond

Answer 29

force of attraction between two atoms

Question 30

Reactant

Answer 30

the materials you have in the beginning (of a chemical equation)

Question 31

Product

Answer 31

what you have after the chemical reaction takes place

Question 32

Electrolysis

Answer 32

the chemical reaction commonly used to break down a copper compound 1. Copper compound is dissolved in water to form a solution 2. Two metal strips called electrodes are placed in the copper compound solution 3. Each electrode is attached to a wire, which is connected to a battery 4. When the current is turned on, one elctrde attracts copper and one attracts the other materials 5. the first electrode will become coated with copper

Question 33

Solid

Answer 33

a substance with particles that are tightly packed together and stay in fixed positions, has definite shape and volume, particles vibrate in place

Question 34

Liquid

Answer 34

substance in which particles are free to move, has no definite shape, but definite volume

Question 35

Gas

Answer 35

A substance whose particles spread apart, filling all the space available to them, can be easily compressed and has no definite shape or volume

Question 36

Fluid

Answer 36

a substance that can flow (liquid and gas)

Question 37

Changes of state

Answer 37

Melting, freezing, vaporization(evaporation and boiling, lower air pressure, less energy need to boil), condensation, sublimation(when a solid changes directly into a gas, no liquid state)

Question 38

Endothermic reaction

Answer 38

absorbs energy in the form of heat

Question 39

Exothermic reaction

Answer 39

releases energy in the form of heat

Question 40

Activation energy

Answer 40

the minimum amount of energy needed to start a chemical reaction

Question 41

Amorphous solid

Answer 41

solid in which the particles are not arranged in a regular pattern, does not have a distinct melting point, gradually gets softer and softer

Question 42

Crystalline solid

Answer 42

solid made of particles that form regular repeating patterns, creating crystals, has a distinct melting point

Question 43

Surface tension

Answer 43

the result of the inward pull among the molecules of a liquid that brings the molecules on the surface closer

Question 44

Viscosity

Answer 44

the resistance of a liquid to flowing

Question 45

Chemistry

Answer 45

the study of the properties of matter and how matter changes