Changes In Matter And Types Of Matter

Question 1

All elements and compounds are pure substances because

Answer 1

There is 1 kind of atom only and there is a common ratio throughout

Question 2

Mixtures can never be pure substances because

Answer 2

There are several kinds of atoms and no common ratio throughout

Question 3

Elements

Answer 3

Smallest unit: “Atom”
Orbital - elections (-) and protons (+), Nucleus - neutron (+-)

Question 4

Molecules

Answer 4

2 ore more atoms of the same element bonded together by a chemical bond (chemical energy)
Homogenous

Question 5

Compound

Answer 5

2 or more different atoms present and bonded together
Common ratio of atoms/molecules

Question 6

Pure substance

Answer 6

Can be broken down evenly or a single part of a mixture
Made of only one kind of particle, can be elements or compounds but same substance throughout

Question 7

Mixture

Answer 7

Some elements are chemically bonded and some aren’t, single atoms/molecules AND compounds are present
Arbitrary distribution
Do not bond chemically

Question 8

Chemical change

Answer 8

New product has been created
Irreversible

Question 9

Physical change

Answer 9

Shape, state of matter, 5 senses change
Reversible

Question 10

Homogenous

Answer 10

Contents uniformly distributed throughout mixture, 2 or more atoms from same elements

Question 11

Heterogenous

Answer 11

Contents not uniform or have localized regions, 2 or more atoms from different elements

Question 12

Solid, liquid, gas movement

Answer 12

Solid- move in place
Liquid- move around eachother
Gas- Freeform, high thermal E

Question 13

5 examples of homogenous mixtures

Answer 13

PURE air
Water
Steel
Salt
Detergent

Question 14

5 examples of heterogenous mixtures

Answer 14

Sand
Concrete
Oil and vinegar
Salad
Mud

Question 15

Laws of Chemical change

Answer 15

Color change, formation of precipitate, formation of gas, odor change, temp change, light is produced,