Chemestry

Question 1

How are elements classified?

Answer 1

Based on the atomic number of their atoms

Question 2

Elements are listed in order of…

Answer 2

Their atomic number

Question 3

How many columns are there?

Answer 3

18

Question 4

What are the two types of properties?

Answer 4

Observable and measurable

Question 5

Define observable properties

Answer 5

Properties that you can touch, feel, taste, smell, and see.

Question 6

Define measurable properties

Answer 6

Properties that include numbers and measurement

Question 7

Define pure substance

Answer 7

Only 1 particle, but can have multiple atoms. They only have one set if properties.

Question 8

What are the two sub categories of pure substances

Answer 8

Elements and compounds

Question 9

Define elements

Answer 9

Made of only one type of atom and can’t be broken down into simpler subtenses by chemical reactions.

Question 10

Define compounds

Answer 10

Made of two or more elements that have been chemically combined into one.

Question 11

Define a particle

Answer 11

two or more atoms chemically connected together

Question 12

Define molecule

Answer 12

a particle made of two or more atoms chemically connected together

Question 13

Compounds are..

Answer 13

pure substances made of two or more elements that have been chemically combined into molecules

Question 14

Hydrogen and oxygen are ________ gasses

Answer 14

Flammable

Question 15

Define mixture

Answer 15

A (non chemical) combination of two or more pure substances

Question 16

Define mechanical mixture

Answer 16

A rough mixture where the individual components can be distinguished by eye

Question 17

Define suspension

Answer 17

A cloudy mixture in which clumps of a solid or droplets of a liquid are scattered throughout a liquid or gas

Question 18

define solution

Answer 18

A uniform mixture where any given part of it contains the same ratio of ingredients

Question 19

Name three properties of a physical change.

Answer 19

1. Reversible
2. no chemicals are changed
3. The substance doesn’t change

Question 20

Name three properties of a chemical change.

Answer 20

1. often irreversible
2. Chemical bonds have changed
3. The substance changes into something else