Q: Which of the following answers for the following conversions contains the correct number of significant figures? $$2.54 \times 3 \ m = 394.1 \ in$$

$$24.9 \ min \times \frac{1 \ hr}{60 \ min} = 0.415 \ hr$$

Question 1

Which of the following best describes the unit of density in the metric system?

Accepted Answer

gram/mL

Question 2

A sample of medication is measured as 45.00 mm. How many significant figures are in this measurement?

Accepted Answer

four

Question 3

Which of the following conversions is correctly rounded to four significant figures?

Accepted Answer

$$40.0332 \ g to$$ $$40.03 \ g$$

Question 4

What is the correct answer for the calculation of a volume (in mL) with measured numbers $$2.54 \ cm$$, $$2.53 \ cm$$, and $$0.14 \ cm$$?

Accepted Answer

$$0.22 \ mL$$

Question 5

Which of the following is the largest unit?

Accepted Answer

kilogram

Question 6

Which of the following answers for the following conversions contains the correct number of significant figures? $$2.54 	imes 3 \ m = 394.1 \ in$$

Accepted Answer

$$24.9 \ min 	imes \frac{1 \ hr}{60 \ min} = 0.415 \ hr$$

Question 7

A value of $$36 \ mL is a $$measure of ________.

Accepted Answer

volume

Question 8

If the dosage for medication is $$225 \ mg/kg$$, how many grams should a $$2.5 \ kg$$ child be given?

Accepted Answer

$$5.6 \ g$$

Question 9

The distance between two cities is $$1100 \ km. $$How long will it take, in hours, to drive from one city to the other if your average speed is $$68 \ miles/hr$$? ($$1 \ km = 0.621 \ miles)$$

Accepted Answer

$$10 \ h$$

Question 10

Which of the following substances will float in gasoline, which has a density of $$0.94 \ g/mL$$? The density of each substance is shown in parentheses.

Accepted Answer

cork ($$D = 0.16 \ g/mL)$$

Question 11

What is the mass in kilograms of $$300. \ mL of an $$intravenous glucose solution with a density of $$2.15 \ g/mL$$?

Accepted Answer

$$0.645 \ kg$$

Question 12

Oxygen ($$O_2) is an $$example of a(n) ________.

Accepted Answer

element

Question 13

Which of the following is a heterogeneous mixture?

Accepted Answer

chicken soup

Question 14

Which of the following statements about liquids is TRUE?

Accepted Answer

liquids have mass and occupy space (have volume)

Question 15

The temperature of liquid helium is $$-180 ^\circ C. $$What is the corresponding reading on the Kelvin scale?

Accepted Answer

$$93 \ K$$

Question 16

If the temperature is $$25 ^\circ C$$, what is the corresponding temperature on the Fahrenheit scale?

Accepted Answer

$$77 ^\circ F$$

Question 17

Which of the following is an example of potential energy?

Accepted Answer

water stored in a reservoir

Question 18

3.25 kcal is the same amount of energy as ________.

Accepted Answer

$$13600 \ J$$

Question 19

A serving of fish contains $$50 \ g of $$protein and $$4 \ g of $$fat. How many kcal are in the serving? (Use $$4 \ kcal/g$$ for protein and $$9 \ kcal/g$$ for fat. Report the answer in two significant figures.)

Accepted Answer

$$240 \ kcal$$

Question 20

The specific heat of ethanol is $$0.59 \ cal/g ^\circ C. $$Calculate the amount of heat (in cal) required to raise the temperature of $$10.0 \ g of $$ethanol from $$13 ^\circ C to$$ $$23 ^\circ C.$$

Accepted Answer

$$59 \ cal$$

Question 21

Which of the following physical changes require the release of heat for the process to occur?

Accepted Answer

deposition (cooling vapor to solid)

Fundamental Concepts and Calculations in GOB Chemistry: Study Guide

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