Q: Using dimensional analysis, how many centimeters are in 294.5 nm? (Use $$1\ \text{cm} = 10^7$\ \text{nm})$$

$$2.945 \times 10$$^{-5}$$\ \text{cm}$$

Question 1

Which of the following statements best explains why the Kelvin scale is considered an absolute temperature scale?

Accepted Answer

Because 0 K corresponds to zero thermal energy, making it impossible to have negative values.

Question 2

Convert the record high temperature for DFW (113 °F) to Kelvin. Use the following equations:
$$
T_C = \frac{5}{9}(T_F - 32)
$$
$$
T_K = T_C + 273.15
$$

Accepted Answer

$$318.7\ K$$

Question 3

Which temperature scale can never produce a reading below zero, and why?

Accepted Answer

Kelvin, because zero Kelvin represents absolute zero, the lowest possible thermal energy.

Question 4

How many significant figures are in the measurement 0.0003200 g?

Accepted Answer

4

Question 5

A student measures a temperature as 152 °C using the oven thermometer shown. If the smallest increment on the thermometer is 2 °C, what is the estimated digit in the measurement?

Accepted Answer

The units place is certain, the estimated digit is in the tenths place

Question 6

Evaluate $$1013\ 	ext{cm} - 955.12\ 	ext{cm} + 6.485\ 	ext{cm}$$ and report the answer with the correct number of significant figures.

Accepted Answer

$$64.4\ 	ext{cm}$$

Question 7

A measurement is recorded as 40.0 g. According to the rules for significant figures, how many significant figures does this value have?

Accepted Answer

3

Question 8

A graduated cylinder contains 32.0 mL of water, which is also measured as 1.08 fluid ounces. How many milliliters are in 1 fluid ounce?

Accepted Answer

$$29.6\ 	ext{mL}$$

Question 9

Using dimensional analysis, how many centimeters are in 294.5 nm? (Use $$1\ 	ext{cm} = 10^7$\ 	ext{nm})$$

Accepted Answer

$$2.945 	imes 10$$^{-5}$$\ 	ext{cm}$$

Question 10

A rectangular ingot of gold has a mass of 3380 g and dimensions $$3.78\ 	ext{cm} 	imes 7.20\ 	ext{cm} 	imes 6.43\ 	ext{cm}. $$What is the density of gold in $$	ext{g/cm}^3$$?

Accepted Answer

$$11.3\ 	ext{g/cm}^3$$

Question 11

How many square millimeters are in $$1\ 	ext{cm}^2$$?

Accepted Answer

$$100\ 	ext{mm}^2$$

Question 12

A recipe calls for 8.0 fluid ounces of milk. Using the conversion $$1\ 	ext{quart} = 32\ 	ext{fl. oz.}$$ and $$1\ 	ext{quart} = 0.94633\ 	ext{L}$$, what is the volume in liters?

Accepted Answer

$$0.2366\ 	ext{L}$$

Question 13

Convert $$0.12\ 	ext{km/min} to $$miles per hour. (Use $$1\ 	ext{mile} = 1.6093\ 	ext{km})$$

Accepted Answer

$$4.5\ 	ext{mi/hr}$$

Question 14

Which of the following best describes why the Fahrenheit scale is not considered an absolute scale?

Accepted Answer

Because 0 °F is not the lowest possible temperature.

Question 15

If you have 47712 grams of a substance, how many kilograms is this? (Use dimensional analysis and $$1\ 	ext{kg} = 1000\ 	ext{g})$$

Accepted Answer

$$47.712\ 	ext{kg}$$

Question 16

A cube of gold has a volume of $$1.50\ 	ext{in}^3. If $$the density of gold is $$11.3\ 	ext{g/cm}^3$$ and $$1\ 	ext{in} = 2.54\ 	ext{cm}$$, what is the mass of the cube in grams?

Accepted Answer

$$278\ 	ext{g}$$

Question 17

Which of the following is an example of an exact number?

Accepted Answer

1 inch = 2.54 cm (exactly)

Question 18

When performing the calculation $$(4.8 - 4.32)/4.32 	imes 100.0\%$$, what is the correct answer with the proper number of significant figures?

Accepted Answer

$$11\%$$

Question 19

How many cubic feet are in 1 cubic yard? (Use $$1\ 	ext{yd} = 3\ 	ext{ft})$$

Accepted Answer

$$27\ 	ext{ft}^3$$

General Chemistry Study Guidance: Temperature, Significant Figures, Measurement, and Unit Conversions

Study Guide - Practice Questions

Study Guide - Flashcards