chem test 1

what is a theory?

• an explanation that has been repeatedly supported by many experiments

• an educated guess based on prior knowledge

• a thought that has been proven scientifically

what is the SI base unit for distance?

• kilograms

• seconds

• mole

• meter

what is the SI base unit for amount of a substance?

• mole

• kilogram

• seconds

• meter

what is the SI base unit for mass?

• meter

• kilogram

• seconds

• mole

what is the SI base unit for time?

• seconds

• kilogram

• mole

• meter

why is the SI base unit for temperature kelvin?

• there is virtually no kinetic energy/particle motion

• it sounds smarter

• there is too much kinetic energy/particle motion

put into scientific notation: 0.0008

• 8.0 x 10^-5

• 8.0 x 10^3

• 8.0 x 10^-4

put into standard notation: 2.2 x 10^5

• 2,200

• 0.000022

• 220,000

what is the sum of (1.23 x 10^5) + (5.35 x 10^6)?

• 5,473,000

• 123,000

• 5,350,000

what is the product of (1.5 x 10^-2) • (8.0 x 10^-1)?

• 0.015

• 0.8

• 0.012