Intro to Chem

Question 1

What are the two worldviews of chemistry? How do they differ? Which one will we focus on mainly during this course (!!) ?

Answer 1

Macroscopic Chemistry Worldview: objects we can see/touch/deal with daily
!! Microscopic Chemistry Worldview: atoms; molecules

Question 2

What are the two components of chemistry?

Answer 2

(nature of) Matter and Energy

Question 3

Name four types of scientific methods

Answer 3

• Hypothesis: formulate to provide tentative explanation of facts
• Observation and Experiment: observations made and info collected
• Law: large amount of data related to a certain phenomenon that have been collected
• Theory: unifying principle that explains large body of facts

Question 4

What are 6 ideas the word “chemistry” can be applied to?

Answer 4

CRAP FN

• Combustion
• Rusting
• Absorption/Emission of Energy
• Phase Changes (ex: liquid -> solid -> gas)
• Formation of Atom Molecules
• Nuclear Reactors (ex: bombs)

Question 5

Chemistry is the study of _______

Answer 5

change

Question 6

Chemistry is related to:
A) Bio
B) Physics
C) Geology
D) Nuclear Energy
E) All of the above

Answer 6

E) All of the above

Question 7

The principles of chemistry can be used to describe what 3 things/concepts?

Answer 7

The principles of chemistry are used to:

• Describe what changed
• Describe what happened to cause this change
• Describe why the sample has exhibited a specific change

Question 8

To avoid confusion with units, scientist agreed on a standard set of units. These standards are called the…

Answer 8

System Internationales (International System of Units)

Question 9

Name a few examples of the units used under the System Internationales

Answer 9

Kg (mass)
m (length)
K (temp)
s (time)
L (volume)

Question 10

How many grams are in 1kg?

Answer 10

1 kg = 1000g (base unit)

Question 11

How many centimeters are in 1 meter?

Answer 11

1m = 100cm

Question 12

How many millimeters are in 1 meter?

Answer 12

1 meter = 1000mm

Question 13

How many micrometers are in 1 meter?

Answer 13

1 meter = 10⁻⁶ (1,000,000) µm

Question 14

How many millimeters are in 1cm?

Answer 14

1cm = 10mm

Question 15

How many mL are there in 1cm³?

Answer 15

1cm³ = 1mL

Question 16

Understand conversions within the metric system

1. Convert 5.2kg to grams
2. Convert 25,000g to kg
3. Convert 70cm to m
4. Convert 8m to mm
5. Convert 49 cm to mm
6. Convert 6L to mL
7. Convert 576 cm³ ro mL

FOR EXTRA PRACTICE, WORK ON ASSIGNMENT 1.2

Answer 16

1. 5200g
2. 25kg
3. 0.7m
4. 8000mm
5. 490mm
6. 6000mL
7. 576mL

Question 17

Understand scientific notation

Convert each of the numbers form scientific notation to real:

1. 5.7067 x 10⁸
2. 7.1421 x 10⁰
3. 3.164 x 10¹
4. 7.3847 x 10⁻⁸

Convert each of the numbers from real to scientific notation:

5. 0.023862
6. 8,895.8
7. 26.617

FOR EXTRA PRACTICE, WORK ON ASSIGMENT 1.1

Answer 17

1. 570,670,000
2. 7.1421
3. 31.64
4. 0.000000073847
5. 2.3862 x 10⁻²
6. 8.8958 x 10³
7. 2.6617 x 10¹