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Matter with fixed composition and distinct proportion (definite composition).

Pure substances

1

What is the opposite of compound formation?

Decomposition

2

A compound always consists of the same combination of elements (ex: water is always 11% H and 89% O)

Law of Constant (definite) proportions.

3

Combination of two or more pure substances (in definite or variable composition).

Mixtures

4

Do not have uniform composition, properties and appearance. (example:sand)

Heterogeneous mixture

5

Uniform throughout (example: air)

Homogeneous mixture

6

Measured without changing the identity of the substance.

physical properties
(example: color, density, odor, melting point, solubility etc.)

7

Properties that describe how substances react or change to form different substances.

Chemical properties
( example hydrogen burns in oxygen).

8

*do not depend on amount of substance present (example: temperature, melting point ect.)
*They give an idea of the composition of a substance.

Intensive properties

9

*Properties that Depend on quantity of substance present (example mass, volume etc.)
*They give an indication of the quantity of a substance present

Extensive property

10

Substance changes physical appearance without altering its identity (example: changes of state).

Physical change

11

Senses transform into chemically different substances (example: Identity changes, decomposition of water, explosion of nitrogen triiodide)

Chemical changes

12

Type of technique to separate mixtures in which you remove solid from liquid

Filtration

13

Type of technique to separate mixtures in which you boil one or more components of the Mixture.

Distillation

14

Type of technique to separate mixtures in which you exploit solubility of components

Chromatography

15

Distance traveled per unit time

Velocity

16

Equation for density

Density= m/v

17

How well measured quantities agree with each other

Precision

18

How well measured quantities agree with the "true value".

Accuracy

19

In dimensional analysis always ask three questions:

1.What data units are we given?
2.What units do we need in our answer?
3.what conversion factors are available to take us from what we are given to what we need?