Chem Unit 1 Test

Question 1

Law vs theory

Answer 1

Law- statement known to be true, not modified ever, can be added to
Theory- has been tested many times, can be modified

Question 2

Base metric units

Answer 2

Length: meter (m)
Mass: kilogram (kg)
Time: second (s)
Temperature: kelvin (K)
Electric current: ampere (A/amp)
Amount of substance: mole (mol)

Question 3

Prefix going up

Answer 3

Tera- T (10 twelfth)
Giga- G (10 ninth)
Mega- M (10 sixth)
Kilo- k (10 third)
Hecto- h (10 second)
Deka- da (10 first)

Question 4

Prefix going down

Answer 4

Deci- d (10 negative first)
Centi- c (10 negative second)
Milli- m (10 negative third)
Micro- u (10 negative sixth)
Nano- n (10 negative ninth)
Pico- p (10 negative twelfth)

Question 5

Accuracy vs. precision

Answer 5

Accuracy- close to the actual value

Precision- close together

Question 6

Sig fig rules

Answer 6

1) Nonzero numbers
2) Sandwiched zeroes
3) Zeroes after a nonzero and decimal
4) Underlined and sandwiched from
5) Decimal places at end makes all zeroes from before significant

Question 7

Multiply sig fig

Answer 7

Same number of sig figs as least one

Question 8

Adding

Answer 8

Round off answer to the last number place with a significant number for every place

Question 9

Known equipment

Answer 9

Beaker
Graduated cylinder
Balance beam
Funnel
Test tube clamp
Test tube rack
Erlenmeyer flask (triangle)
Bunsen burner 
Tongs
Googles
Mortal and pestle

Question 10

Unknown equipment

Answer 10

Buret (delivers exact mL)
Wire gauze (suspends over Bunsen)
Well plate (mixes small amounts of chemicals together)
Wire brush (cleans inside)

Question 11

Scientific method steps

Answer 11

Ask a question
Make a hypothesis
Design & conduct experiment 
Collect & analyze data
Make a tentative conclusion 
Test conclusion, refine question