Chemistry Ch 3 Review

non-math content

100

What SI unit/dimension measured the amounts of particles of a substance?

moles

200

If a measuring device is not digital, it is called

analog

300

What is the official SI unit for mass?

kg

not g

400

Which metric prefix refers to a billionth of the base unit (10^-9)

nano-

500

Units of measurement that come from basic SI units are called

derived units

simple conversions

100

convert 1.35 km to mm

1,350,000 mm

200

Write 0.00000540 m in scientific notation with correct SD

5.40 x 10^-6 m

300

A fraction equal to 1 that contains both the original unit and its equivalent value in a new unit is called a(n)

conversion factor

400

Convert 0.00052 mm to nm

520 nm

500

What is the product of (15.0 cm)(0.460 m)

3SD

690. cm² or 0.0690 m²

Funner Math

100

What is the sum of 36.4 km + 1400 m?

37.8 km

200

Find the sum of 38.4 g +40.26 g +18 g

precise to the ones place

97 g

300

What is the percent error if you measure a sample to be 38.6 g where it should have been 40.0 g?

(|40.0-38.6|/40.0) x 100% = 3.5%

400

Find the sum of 36.4 m + 1400 m with correct SD

precise to the nearest hundred meters

therefore, 1436.4 = 1400 m :)

500

convert 135 mph to m/s if 1.6 km = 1 mi

3SD

60.4 m/s

Math with significance

100

Find the area of a rectangle with a length of 4.5 m and a width of 0.8 m

3.6 m², but because 0.8 m has 1SD

 = 4 m²

200

What volume does a cube with a length of 3.0 cm, width of 1.08 cm and a height of 15.3 cm?

2 SD

50. cm²

300

If a single book measures 35.4 cm long, how long would 6 books back to back be? (in correct SD)

6 is a pure number, so the answer maintains the original precision

212.4 cm

400

What is the volume of a 35.4 g sample of iron with a density of 7.62 g/mL (hint: use the bridge notation and take note of where the units are)

4.65 mL

500

solve this problem with correct SD

(26.3 g - 14.05 g)/(0.058 mL + 1.15 mL)

10.1666 g/mL

but, 3 SD on top and bottom,

=10.2 g/mL

How many SD's?

100

1.003 m

4 SD

200

4600 L

2 SD

300

0.00450 kg

3 SD

400

3600. g

4 SD

500

If you have a device that is precise to the nearest 100 g and you get a measurement of 10,000 g, how would you write this value in correct SD's?

1.00 x 10⁴