Class 1 Chemistry

Question 1

Matter is?

Answer 1

Another word for all substances that make up our world.

Question 2

Chemical is?

Answer 2

Substance that has the same composition and properties whatever it is found.

Question 3

Observation

Answer 3

Observe, describe, measure

Question 4

Hypothesis

Answer 4

Possible interpretation of observation

Question 5

Experiment

Answer 5

Test to determine validate of hypothesis

Question 6

Metric system

Answer 6

Measurement based on 10

Prefix attached to any unit increases or increases its size by a factor of 10.

Question 7

Scientific notation

Answer 7

Consists of part: a Coefficient, a power of 10 and a unit of measurement.

Question 8

Length

Answer 8

Centimeters, millimeters

Question 9

Volume

Answer 9

Space Occupied by a substance

Question 10

Mass

Answer 10

Amount of matter in an object

Question 11

Density

Answer 11

Mass per unit volume, how much Volume a mass displaces

Measured in g/ml

Question 12

Matter

Answer 12

Matter is everything that has mass and occupies space.
Matter is everywhere.
A substance is matter that has a fixed composition

Question 13

Two types of pure substances

Answer 13

Element

Compound

Question 14

Mixtures

Answer 14

Consisting of two or more different substances mixed together but not chemically combined

Question 15

Homogeneous mixture

Answer 15

Solution composition of the substances are uniform

Question 16

Heterogeneous mixture

Answer 16

Components are visible without uniform composition

Question 17

Mixtures can be physically separated

Answer 17

.

Question 18

States of matter

Answer 18

Solid-definite shape and volume particles are close together and rigid
Liquid-definite volume, no definite shape, particle slowly and randomly. Take shape of container
Gas- no shape or volume, particle are far away, have no attraction to each other, take shape of container

Question 19

Physical

Answer 19

Characteristics that measured or observed without affecting the identity of the substance

Question 20

Chemical

Answer 20

Does that describe the ability of a substance to change into a new substance

Question 21

Physical change

Answer 21

Appearance changes but composition stays the same. Melting, boiling, freezing, condensing (all are water)

Question 22

Temperature conversion

Answer 22

T(f)=1.8xT(c)+32

T(c)= T(f)-32/1.8

Question 23

Element

Answer 23

Pure substance from which all other things are built. Elements cannot be broken down into simpler substances.

Question 24

The Atom

Answer 24

All elements in the periodic table are made up of Atoms.

Adams are the smallest particle of an element

Question 25

Electrical charges

Answer 25

Subatomic particles make up Atoms. Protons, neutrons, electrons Electrons are negatively charged outside the nucleus Protons are positively charged inside the nucleus Neutrons are neutral and inside the nucleus

Question 26

Atoms and elements

Answer 26

Opposites Attract

Question 27

Chemistry is?

Answer 27

The study of composition, structure, Properties and reactions of matter.