Chemistry Unit 2- Mathematical Relationships in Chemistry

Question 1

The Mg should weigh 50g. Tania weighs it 3 times & gets 23g, 24g, 22g. Precise or accurate?

Accepted Answer

Precise

Question 2

If you have a 40.5 mL sample of acetic acid with mass 0.005640 kg, what is the density?

Accepted Answer

0.139 g/ml

Question 3

Calculate the percent composition of Ba in Ba(OH)2.

Accepted Answer

80.2%

Question 4

How many significant figures does 0.004 g have?

Accepted Answer

1

Question 5

What is the mass of a 450.0 cm³ block of silicon if the density of silicon is 2.336 g/cm³?

Accepted Answer

1051 g

Question 6

How many miles will Gi run in two hours if her speed is 15 km/h?

Accepted Answer

18.6 miles

Question 7

What is the density (g/ml) of a sample of oil if 540 cm3 has a mass of 0.23 kg?

Accepted Answer

0.43 g/ml

Question 8

Liquids A & B, have densities 0.75g/ml & 1.14g/ml. Both are in a cup, which floats to the top?

Accepted Answer

Liquid A

Question 9

Convert 0.002 kg into g.

Accepted Answer

2 g

Question 10

If a can has 22.0 oz of soup, how many grams of soup is that? (1 lb = 16 oz, 1 lb = 454 g)

Accepted Answer

624 g

Question 11

3.56 cm+ 2.6 cm+ 6.12 cm= ?

Accepted Answer

12.3 cm

Question 12

How many sig figs does 6000 kg have?

Accepted Answer

1

Question 13

I measure the mass of Ti to be 5.51 g. The actual mass= 5.80 g. Calculate experimental error.

Accepted Answer

5.00 %

Question 14

Convert 23 degrees Celsius to Kelvin.

Accepted Answer

296.15 K

Question 15

Which compound has the largest molar mass?

Accepted Answer

CO2

Question 16

The number 535.602 written in scientific notation is...

Accepted Answer

5.35602×102

Question 17

What is the mass in grams of 5.90 mol C8H18?

Accepted Answer

673 g

Question 18

A student should get 6.7 g of Mg. He actually gets 5.3 g of Mg. Calculate the percent yield.

Accepted Answer

79%

Question 19

How many hydrogen atoms are in 8.46 moles of methane, CH4?

Accepted Answer

2.04 x 10^25 atoms

Question 20

Mass is an example of....

Accepted Answer

quantitative data

Questions 20