Chem Test #1

Question 1

When adding or subtracting…

Answer 1

Round the answer to the LEAST number of decimal places

Question 2

When multiplying or dividing…

Answer 2

Round the answer to the LEAST number of significant places

Question 3

Sig fig rules

Answer 3

• all non zero digits in a measurement are significant
• leading zeros are not significant
• trailing zeroes after the decimal and preceded by a non zero digit are significant
• Assume trailing zeros before the decimal are not significant

Question 4

Chemistry

Answer 4

The COMPOSITION, PROPERTIES, and REACTIONS of matter, using MICROscopic and MACROscopic perspectives

Question 5

Composition

Answer 5

Something created by arranging several things to form a unified whole

Question 6

Properties

Answer 6

Physical

Chemical

Question 7

Physical properties

Answer 7

Characteristics of a substance that can be found without altering the chemical composition
Eg.) mass, volume, density

Question 8

Chemical properties

Answer 8

Characteristics of a substance that determines how it will react with other substances
Eg.) flash point, whether it’s an acid base or salt

Question 9

Reactions

Answer 9

Change that takes place when 2 or more substances interact to form new substances with new properties

Question 10

MACROscopic perspective

Answer 10

Perspective that examines the situation as it is observed in real life

Question 11

MICROscopic perspective

Answer 11

Perspective that examines the situation from the atomic level

Question 12

3 main branches of chemistry:

Answer 12

• Physical
• Inorganic
• Organic

Question 13

Physical chemistry

Answer 13

Study of the physical basis of chemical systems and processes

Question 14

Inorganic chemistry

Answer 14

Study of inorganic compounds, specifically their structure, catalysis, and mechanism of action

Question 15

Organic chemistry

Answer 15

Study of the chemistry of carbon compounds with a few exceptions like carbon monoxide and carbon dioxide

Question 16

Scientific method

Answer 16

1. Question ( based on curiosity, observations, problems)
2. Hypothesis (research, prior knowledge)
3. Design experiment (input/output variable, control variable)
4. Experiment (multiple trials, varying the input variable)
5. Observations (qualitative, quantitive)
6. Analysis (find the pattern)
7. Conclusion (reflect, what was learned?)

Question 17

Why is creativity important in the scientific process?

Answer 17

Creativity is important in the question/problem stage, hypothesis stage, pattern finding and conclusion stage

Question 18

2 main types of observations

Answer 18

• Qualitative

- Quantitive

Question 19

Qualitative observations

Answer 19

Involve observations that are NOT quantified such as….

Sight
Smell
Feel
Sound

Question 20

Quantitive observations

Answer 20

Observations that ARE quantified, and measured, such as…

Height
Volume
Mass

Question 21

7 fundamental measure able quantities

Answer 21

• mass
• length
• time
• temperature
• electric current
• amount of substances
• luminous intensity

Question 22

Derived units

Answer 22

Units formed by the combination of one or more fundamental units

Eg.) volume- cm3
Density- g/mL
Force- kgms-2

Question 23

Capacity units

Answer 23

Units of volume used to measure FLUIDS such as gasses or liquids

Question 24

Cubic units

Answer 24

Units of volume used to measure solids

Eg.) cm3, dm3, m3