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Flashcards in Vocabulary Deck (35)
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1

Scientific method

An organized approach to solve problems

2

Observe

Use your five senses

3

Hypothesis

Educated guess

4

Experiments

Tests hypothesis in order to prove/disprove them.

5

Analysis

Compares the results from the experiment to the original hypothesis

6

Conclusion (theory)

A hypothesis supported by experimental evidence

7

Law

Used to describe a natural phenomenon which has been tested over a long period of time under different conditions

8

Chemistry

The study of matter and the changes it undergoes

9

Matter

Anything that has mass and volume (everything)

10

Mass

The amount of matter in an object (how much “stuff”)

11

Energy

Anything that can do work or produce heat

12

Weight

The force of gravity acting on an object’s mass

13

Solids

Definite shape, definite volume, not compressible, high density

14

Liquid

Indefinite shape, definite volume, not compressible, less dense than solid

15

Gas

Indefinite shape, indefinite volume, are compressible, very low density

16

Matter classified into

Pure substances and mixtures

17

Pure substances

Have uniform and definite composition

18

Elements

Found on the periodic table

19

Compounds

Formed when elements chemically combine, are bonded together

20

Mixtures

Two or more pure substances physically mixed together, no definite composition, are blended

21

Heterogeneous mixtures

Do not have a uniform composition, mixtures can be physically seen and “picked out” of the mixture

22

Homogeneous mixtures

Has a uniform composition, parts of the mixture cannot be picked out

23

Physical properties

Properties that can be measured or observed without changing the identity (or composition) of a substance

24

Chemical properties

Properties that indicate how a substance reacts with other substances

25

Physical changes

Changes in appearance without changing composition

26

Chemical changes

One or more substances react to form new substances with different chemical and physical properties

27

Law of conservation of mass

In any chemical or physical change matter cannot be created or destroyed

28

Measurement

a type of observation

29

Qualitative measurements

descriptive

30

Quantitative measurements

observation made with a measuring instrument and includes both a number and a unit