Matter Changes

Question 0

Convection

Answer 0

• Transfer of thermal energy via particle movement

- boiling water. Warm, less dense water expands to top and cool dense water falls. Cycle continues until evap

Question 1

Covalent bond

Answer 1

• strong bond. Atoms share electron pairs

-

Question 2

Conduction

Answer 2

Thermal energy transfer via particle collision

Question 3

Radiation

Answer 3

thermal energy transfer via elecmag waves

Question 4

Most abundant elements in atmosphere

Answer 4

Nitrogen

Oxygen

Question 5

Most abundant in Earths crust

Answer 5

Oxygen
Silicon
Alum
Iron
Cal

Question 6

Most abundant ocean minerals

Answer 6

Chlorine
Sodium
Mag
Sulfur
Other
Cal

Question 7

Most abundant elements in Humans

Answer 7

Oxygen
Carbon
Hydrogen
Nitrogen
Calcium 
Other
Phosphorus

Question 8

Heterogenous Mixture

Answer 8

Substances are not evenly mixed eg two bowls of trail mix. One with more berries than the other

Can be separated physically

Question 9

Homogenous Mixture

Aka solution

Answer 9

Brass is a homo bc you cannot see the copper and zinc atoms even under most microscopes
But these are still not bonded together

Question 10

Solution

Answer 10

Solvent
Solute
All three states of matter can be either of these in a solution

Question 11

Solvent

Answer 11

Present in large amounts

Question 12

Solute

Answer 12

Break apart or mix evenly

Question 13

Compound

Answer 13

The properties of a compound are different than the properties of the atoms that make it up

Question 14

Two classifications of matter

Answer 14

Substance

Mixture

Question 15

Substance

Answer 15

Composition is always the same

Question 16

Chemical property

Chemical change

Answer 16

A substances ability inability to combine with or change into one more new substances.

Formation of a new substance

Question 17

Physical change

Answer 17

Melting
Boiling
Changing shape
Mixing
Dissolved
Temp var

Question 18

Chemical change

Answer 18

Change in color
Burning
Rusting
Formation of gas
Precipitate (2liqds form a solid)
Spoiling food
Tarnishing silver
Digesting food

Question 19

Particle attraction strength in solid

Answer 19

Close together causing a solid and preventing movement along particles

Question 20

Particle attraction strength in liquid

Answer 20

Weak allowing the particles to slide freely past one another as with marbles in a bag

Question 21

Particle attraction strength in gas

Answer 21

Particles move freely bc they are spread apart and so not held together by attractive forces

Question 22

Identifying unknown substances via physical properties

Answer 22

Melting point and density are most useful

These are constant regardless of the size or vol

Question 23

Nonmetals

Answer 23

brittle as a solid
Most are gases at room temp
Poor conductors

Question 24

Metalloids

Answer 24

Properties in common with both metals and non
Good conductors at hi temps
Groups 13-17 in stair step formation
Eight total

Question 25

Metals

Answer 25

All transition elements r metals
Ductile (ability to be pulled into wire)
Hg not solid at room
Metallic properties increase left to bottom of p table

Question 26

Alkali metals

Answer 26

Group one
Unstable as lone elements
Lowest density of all metals
Soft cut with knife

Question 27

Name the two types if substances

Answer 27

Elements

Compounds