General Chemistry

Which of the following statements is true?

Choose the homogeneous mixture from the list below.

Classify each of the following as an element, compound or mixture.

a) Ammonia, NH3

b) Gold bar

c) Orange juice

d) Wine

e) Saline solution

Which of the following is a physical change?

Which of the following represents a reversible change?

Which of the following represents a chemical property of hydrogen gas?

Which of the following is not a physical property?

Which of the following is not an example of an intensive property?

Which of the following is not an example of an extensive property?

Which of the following is an extensive property of a nitrogen molecule?

Which of the following containers would have the greatest flow of thermal energy in the form of heat?

At what temperature is the temperature in degrees Fahrenheit equal to the temperature in degrees Celsius?

Convert the following scientific notation values into standard notation.

a) 1.25 x 10^-4

b) 3.20 x 10^-9

c) 1.6100 x 10⁴

Convert the following standard notation values into scientific notation.

a) 377,000

b) 0.000101

c) 707.82

Based on your knowledge of the SI base units, determine the units for the area of a typical chemistry laboratory.

Which quantity in the following pair is smaller?

Use the prefix multipliers to express each measurement without any exponents.

a) 32 x 10-13 L

b) 7.3 x 106 g 

c) 18.5 x 1011 s

Use scientific notation to express each quantity with only the base unit. 

a) 83 µm

b) 193 kg

c) 2.7 mmol

If a room has a volume of 1.15 x 10⁸ cm³, what is the volume in km³?

How many sig figs does each number contain?

a) 100. min                             

b) 17.3 x 103 mL

c) 10 apples

Indicate the number of significant figures in the following: 

A liter is equivalent to 1.059 qt. 

How many significant figures are contained in the following measurement? 

3,482,005 mg 

What answer should be reported, with the correct number of significant figures, for the following calculation?
[(42.00 − 40.914) ⋅ (25.739 − 25.729)] / [(11.50⋅1.001) + (0.00710 ⋅ 700.)]

For 7 hours, an intravenous bag delivers medication to a patient at a rate of 2.75 drops a second with a mass of 42 mg per drop. Identify the given amount and all conversion factors.

During World War II in the US, nickel metal was in short supply and needed for the war effort. So from 1942 to 1945 the government replaced the nickel in the five-cent coin with silver until it was 35 grams of silver per 100 grams. Today the mass of the coin is 5.0 grams with a value of approximately $28.40 per ounce. Identify the given amount and all the conversion factors from the presented information.