Chemistry Test Review

Question 0

Physical Properties

Answer 0

Able to be usually observed with our senses, it allows us to distinguish one kind of matter from another. It is able to change, but not to make new substances. Breaking, grinding, splitting, crumbling, dissolving, eroding, cutting, drying, evaporating, melting, freezing and condensing are all physical properties

Question 1

Kinetic Molecular Theory of Matter

Answer 1

Motion of molecules that determines if the matter is a solid, liquid, or a gas. Solids move very little, gases move very quickly colliding into each other, and liquids move freely but in a defined space

Question 2

Physical change

Answer 2

Occurs when the appearance of matter changes, but in composition of the matter does not change. Changes in size, shape, color, odor, hardness, or gas, solid, or liquid are all physical changes. This can be done by cutting, dissolving, evaporating, and flattening

Question 3

Physical constants

Answer 3

Density, boiling, melting, and freezing points

Question 4

Chemical properties

Answer 4

Being only to be observed in a chemical reaction, it is a description of how one chemical reacts to another chemical. This is only recognized when chemicals react with one another. Color change, bubbles, gas, odor, new chemical, heat, light are all examples.

Question 5

Chemical change

Answer 5

Occurs when new kinds of matter are formed. The composition of the matter changes and the new kinds of matter have different properties from the old matter. The properties of the original substance can no longer be recognized.

Question 6

Pure substance

Answer 6

The same composition throughout and occurs naturally. They are called elements and compounds.

Question 7

Element

Answer 7

Cannot be broken down

Question 8

Compounds

Answer 8

Formed when the chemical combination of two or more elements. The elements cannot be separated physically. The properties of a compound are entirely different from the properties of each of the elements that make up the compound.

Question 9

Mixtures

Answer 9

Formed when two or more substances are physically combined. The parts of a mixture can be physically separated from each other. All of the substances in a mixture retain original properties

Question 10

Homogenous mixture

Answer 10

Parts of mixture are evenly distributed

Question 11

Heterogenous mixture

Answer 11

Parts of mixture are not evenly distributed

Question 12

Inertia

Answer 12

The resistance to change (inert)

Question 13

Solutions

Answer 13

Homogenous mixtures of two or more substances.

Question 14

Solute

Answer 14

Substance dissolved in a solution

Question 15

Solvent

Answer 15

Substance being dissolved in a solution

Question 16

Solubility

Answer 16

Amount of solute that can be dissolved in a certain amount of solvent at a given temperature

Question 17

Insoluble

Answer 17

Won’t dissolve solvent

Question 18

Dilute solution

Answer 18

Small amount of solute in solution

Question 19

Saturated

Answer 19

When a solution dissolves all of the solute it can dissolve

Question 20

Unsaturated

Answer 20

When more solute can be dissolved in a solution

Question 21

Supersaturated

Answer 21

When a solution dissolves more solute than usual

Question 22

Proton

Answer 22

Located inside nucleus and has a positive charge

Question 23

Neutrons

Answer 23

Has no charge and is found inside the nucleus

Question 24

Electrons

Answer 24

Has a negative charge and is found outside the nucleus

Question 25

Dmitri Mendeleev

Answer 25

Created the first modern periodic table in 1869

Question 26

Chemical bond

Answer 26

Force that holds atoms together

Question 27

Valence

Answer 27

A number with a plus or minus sign in front of it, which is written next to the atom

Question 28

Covalent bond

Answer 28

Formed when atoms share electrons to fill their outer shell (octet rule)

Question 29

Ionic bond

Answer 29

Formed when atoms transfer electrons. When an atom gains an electron, it becomes negatively charged and becomes a negative ion, same for losing and electron, it becomes a positive ion with a positive charge. Since positives and negatives attract, they create a bond

Question 30

Periods

Answer 30

Across

Question 31

Groups

Answer 31

Down

Question 32

Nucleus

Answer 32

Middle of the atom, where protons and electrons are