Ap Chem. Ch.1

Question 0

What is the opposite of compound formation?

Answer 0

Decomposition

Question 1

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

Answer 1

Pure substances

Question 2

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

Answer 2

Law of Constant (definite) proportions.

Question 3

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

Answer 3

Mixtures

Question 4

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

Answer 4

Heterogeneous mixture

Question 5

Uniform throughout (example: air)

Answer 5

Homogeneous mixture

Question 6

Measured without changing the identity of the substance.

Answer 6

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

Question 7

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

Answer 7

Chemical properties

example hydrogen burns in oxygen

Question 8

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

Answer 8

Intensive properties

Question 9

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

Answer 9

Extensive property

Question 10

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

Answer 10

Physical change

Question 11

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

Answer 11

Chemical changes

Question 12

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

Answer 12

Filtration

Question 13

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

Answer 13

Distillation

Question 14

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

Answer 14

Chromatography

Question 15

Distance traveled per unit time

Answer 15

Velocity

Question 16

Equation for density

Answer 16

Density= m/v

Question 17

How well measured quantities agree with each other

Answer 17

Precision

Question 18

How well measured quantities agree with the “true value”.

Answer 18

Accuracy

Question 19

In dimensional analysis always ask three questions:

Answer 19

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?