Ch 1: Chemistry

Question 1

Define: Hypothesis

Answer 1

A statement that explains or describes an observation

Question 2

Define: Experimenr

Answer 2

A controlled testing of a substance or system’s properties by carefully recording measurements.

Question 3

Define: Theory

Answer 3

The result of thorough testing and the confirmation of a hypothesis.

Question 4

Define: Scientific Law

Answer 4

A hypothesis or theory that is tested time after time with the same resulting data & thought to be without exception.

Question 5

Define: Scientific Notation

Answer 5

A measurement system based on a decimal system with calculations written in groups of 10s.

Question 6

T (give prefix and value)

Answer 6

tera - 10 to the 12th

Question 7

G (give prefix and value)

Answer 7

giga - 10 to the 9th

Question 8

M (give prefix and value)

Answer 8

mega - 10 to the 6th

Question 9

k (give prefix and value)

Answer 9

kilo - 10 to the 3rd

Question 10

da (give prefix and value)

Answer 10

deca - 10 to the 1

Question 11

d (give prefix and value)

Answer 11

deci - 10 to the -1

Question 12

c (give prefix and value)

Answer 12

centi - 10 to the -2

Question 13

m (give prefix and value)

Answer 13

milli - 10 to the -3

Question 14

μ (give prefix and value)

Answer 14

micro - 10 to the -6

Question 15

n (give prefix and value)

Answer 15

nano - 10 to the -9

Question 16

p (give prefix and value)

Answer 16

pico - 10 to the -12

Question 17

Explain Significant Figures

Answer 17

1. All nonzero digits (1, 2, 3, ect) = significant
2. Zeroes between nonzeroes = “
3. Zeroes to the right of nonzeroes = “ with decimal, not without
4. Zeroes on left of first nonzero = not

Question 18

Precision vs Accuracy

Answer 18

Precision is ability to reproduce measurement.

Accuracy describes closeness of a measurement to its true value.

Question 19

What are the 4 steps of the scientific method?

Answer 19

• Observation
• Hypothesis
• Prediction
• Experimentation