Chem unit 2

Question 1

What is matter

Answer 1

Anything that has mass and takes up space

Question 2

What law is this: Matter CAN NOT be created or destoryed by a chemical change, it only changes form

Answer 2

The law of conservation of matter (lavoisier)

Question 3

Quantitative

Answer 3

can be measured

Question 4

Qualitative

Answer 4

Qualitys: observations

Question 5

What is a Physical property

Answer 5

1. Observed with sences
2. determined without** destorying matter**
3. Measurable

Question 6

Chemical property

Answer 6

1. Indicates how a substance reacts with something else
2. Matter will be changed into a new substance after the reaction.

Question 7

Density, Melting point and boiling point are all what kind of property

Answer 7

Physical Property

Question 8

Physical Change

Answer 8

1. A change in size, shape, or state
2. No new substance is formed
3. Reversable

Question 9

Chemical change

Answer 9

1. A change in the physical and chemical properties
2. New substance is formed
3. Not reversable

Question 10

Chemical change (5)

Answer 10

1. Light produced
2. Heat produced
3. Gasses are released
4. Precipitates (solid) -> Insoluble (cant disolve)
5. Color change

Question 11

Matter breaks up into what

Answer 11

Pure substances and Mixtures

Question 12

Pure substances are what

Answer 12

• Chemical reaction
• fixed ratio

Question 13

Mixtures are what

Answer 13

• Physical reaction
  ratio varrys

Question 14

Pure substances break up into what

Answer 14

Elements and compounds

Question 15

Mixtures break up into what

Answer 15

Homogeneous (same) and Heterogeneous (diffrent)

Question 16

Examples of homogeneous mixtures

Answer 16

Brass (cooper and zinc)

Question 17

Examples of Heterogeneous mixtures

Answer 17

Water and copper

Question 18

Pure substances go into what two catigorys

Answer 18

Elements and compounds

Question 19

Examples of a element

Answer 19

Copper

Question 20

Example of a compound

Answer 20

water

Question 21

Homogeneous mixtures

Answer 21

• cannot see diffrent parts
• uniform mixture (looks throighout) -* particles easily distributing *
• no fixed ratio
• Aqueous solution (disolved in water) Exp: salt water & air

Question 22

Heterogeneous Mixtures

Answer 22

• can see diffrent parts
• not uniform
• no fixed ratio
• Examples: salad dressing & sand

Question 23

Types of mixture: Filteration

Answer 23

• Heterogeneous
• not disolved n water
• sand + water

Question 24

Types of mixtures: Evaporation

Answer 24

• Homogeneous
• used when something is disolved in water
• NacI (aq)

Question 25

Tyoes of mixtures: Distillation

Answer 25

- Distillation is a purification process that separates components of a liquid mixture by heating it to boiling and then cooling the resulting vapors to condense them back into liquid form. - Homogeneous - Liquids by diffrent boiling points - Exp: water + alcohol

Question 26

Chromatography

Answer 26

- Homogeneous - Pigments by size

Question 27

Mixtures are separated (blank) - There are (blank) present in a mixture

Answer 27

Mixtures are separated **Physically** - There are **no chemical bonds** present in a mixture

Question 28

What are elements

Answer 28

*table S* - Contains only one type of atom - **Cannot be broken down into a simpler type of matter ** chemically or physically - Can exist as atoms or molecules - One type of atom only

Question 29

What is a compound

Answer 29

- contains atoms of **two or more diffrent elements **bonded together - **Can be chemically broken down into elements** - Typically has diffrent properties to the elements it made of

Question 30

What are diatomic elements

Answer 30

elements that always come in pairs, bonded together as two identical atoms

Question 31

What are the diatomic elements

Answer 31

Brother = Bromine (Br₂) H - Hydrogen (H₂) O - Oxygen (O₂) N - Nitrogen (N₂) Cl - Chlorine (Cl₂) I - Iodine (I₂) F - Florine (F₂)

Question 32

Properties of metals

Answer 32

- Luster (shine) - good conductors - high density + high melting point - Melleable - Ductile (Can be drawn into wires) - Ussually solid at room temp - opaque (thin sheets)

Question 33

Non metals

Answer 33

- dull - poor conductors - nonductile - *brittle* - may be solids, liquids, or gasses at room temp - Transparent as thin sheets - not sonorous

Question 34

Metalloids

Answer 34

- Look like metals, behave like non-metals - are all solid at room temp - brittle. Hard and somewhat reactive - intermediate to fairly strong electrical conductivity (semi conductors) - Have the ability to form metalic alloys

Question 35

MUST KNOW WHERE METALS, NON MEYALS AND METALLOIDS ARE ON PERIODIC TABLE

Answer 35

MUST KNOW WHERE METALS, NON MEYALS AND METALLOIDS ARE ON PERIODIC TABLE

Question 36

what do attomic number and mass represent

Answer 36

the atomic number is the number of protons in an atom's nucleus, which uniquely identifies the element. The atomic mass (often listed as mass number or atomic weight on a periodic table) represents the total number of protons and neutrons in an atom's nucleus and is a weighted average of all naturally occurring isotopes of that element