Intro to Chemistry

Question 1

Why do we study chemistry?

Answer 1

• Chem. affects all aspects of life and most natural events.
• Chem. helps explain natural world.
• Studying chem. makes you an informed citizen.
• Connects inanimate world (physics) to the living world (biology)

Question 2

What is chemistry?

Answer 2

The study of composition (the makeup), structure, and properties of matter and the changes matter undergoes during chemical reactions.

Question 3

What is matter?

Answer 3

Anything that has mass and takes up space.

Question 4

What are some examples of matter?

Answer 4

A person, air, blood, a pencil, etc.

Question 5

What are some examples of things that aren’t matter?

Answer 5

Heat, light, energy, etc.

Question 6

What are the states of matter?

Answer 6

Solid, liquid, gas, (also plasma)

Question 7

What measurement system is used in Science?

Answer 7

Metric system

Question 8

Whats the base unit for mass?

Answer 8

gram (g)

Question 9

Whats the base unit for volume?

Answer 9

Liter (l)

Question 10

Whats the base unit for length?

Answer 10

Meter (m)

Question 11

How do you change a metric system unit?

Answer 11

Multiply or divide by 10.

Question 12

What is density?

Answer 12

The substance’s mass per unit of volume. The symbol most often used for density is ρ.

Question 13

How to you calculate Density (g/Ml)?

Answer 13

Density (g/Ml) = mass (g) / volume (Ml)

hint: you can use triangle with mass on top.

Question 14

What things describe chemisty?

Answer 14

Time, Energy, Temperature, Mole

Question 15

What is time?

Answer 15

Duration of a process (seconds (s))

Question 16

What is energy?

Answer 16

Capacity to do work. (Joule (J) or Calories (cal))

Question 17

What is temperature?

Answer 17

Measure of kinetic energy in particles. (Celcius 0c or Kelvin 273k)

Question 18

What is mole?

Answer 18

Substance that contains 6.02 * 10^23 particles. (mol)

The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.

Question 19

What is the scientific method?

Answer 19

A logical systematic approach to the solution of a scientific problem.

Question 20

What are the steps of the scientific method?

Answer 20

1. Observation of nature (problem)
2. Form a hypothesis ( a proposed explanation)
3. Experiment and collection of Observations (IV, DV, constants, control)
4. Writing conclusion (Summary of results explained)
5. Developing theory (Well tested with Repeated trials for broad observations)
6. Scientific law (More experiments leading to description of relationships without explanation)

Question 21

What are the 2 relationships?

Answer 21

Direct and indirect

Question 22

Whats a direct relationship?

Answer 22

The values increase together

Question 23

Whats the inverse relationship?

Answer 23

The values negate each other.

Question 24

What is the independent variable?

Answer 24

Variable changed

Question 25

Whats the dependent variable?

Answer 25

Variable measured

Question 26

Whats the controls (constants)?

Answer 26

Things that stay the same in the experiment.

Question 27

Whats the control group (control)?

Answer 27

The normal IV/ standard not effected by IV