Chemistry and Measurement

Dimensional Analysis

100

A conversion factor is...

something used to convert between units/a relationship between units 

200

What needs to be on the bottom for a unit to cancel out? 

The same unit 

300

When numbers on are opposite sides, you...

Divide

400

When numbers are on the same side (both on top), you....

multiply 

500

If 2.54 cm = 1 inch, how many inches are in 543 cm? (INCLUDE UNIT) 

213.78 in 

Scientific Notation

100

The shortcut method for writing very small numbers or very large numbers.

Scientific Notation

200

Example of Scientific notation and Standard notation

229,000 (Standard) 4.73 x 10³ (Scientific)

300

245,860,000,000 Place in Scientific Notation

2.4586 x 10¹¹

400

2.65 x 10^-12 Standard Notation

.00000000000265

500

What does a negative exponent tell you about a number?

The number is very small.

The Mole

100

1 mole = ______ atoms/particles/molecules 

6.022 x 10²³

200

Does 1 mole water have the same mass of 1 mole iron? 

No- only same number of particles 

300

Why do we use the mole?

Makes counting large quainties like particles much easier

400

Is 1 mol water = 1 mol iron = 1 mol copper = 1 mol charcol in terms of particles? If so, how many particles do each have

Yes- each have 6.022 x 10²³ particles 

500

Another name for 6.022 x 10²³

Avagadro's Number/Constant 

Unit Conversions and Derived Units

100

Kilo- means...

1,000 times

200

500 mg = _____ g

0.5 grams

300

2.5 km = ______ cm

250,000 cm

400

Calculate the density of an object with the mass of 24.3 grams and the volume of 32.9 mL.

.739 g/mL

500

What is the volume of an object with the density if 1.25 g/mL and the mass of 281 grams?

225 mL

Units

100

Measurment system we use in science

The metric system or SI system 

200

Unit for measuring length 

meter

300

Unit for volume 

liter 

400

Units for density 

g/ml and cm3

500

Why do we use the metric system in science?

All numbers are multiples of 10