Q: Convert 3.4 hours to seconds using dimensional analysis.

$$1.22 \\ \times 10^4$ \\ sec$$

Q: Convert 800 nm to Mm and report the answer in scientific notation.

$$8.00 \\ \times 10$$^{-13}$$ \\ Mm$$

Question 1

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture that is not consistent throughout, such as oil and vinegar salad dressing.

Question 2

Which of the following is an example of a physical change?

Accepted Answer

Ice melting to form liquid water.

Question 3

A student measures the mass of a stone as 28.4 g and its volume as 10.3 mL. What is the density of the stone?

Accepted Answer

$$2.76 \ \frac{g}{mL}$$

Question 4

Which of the following statements about significant figures is TRUE?

Accepted Answer

Trailing zeros in a number with a decimal point are significant.

Question 5

Convert 3.4 hours to seconds using dimensional analysis.

Accepted Answer

$$1.22 \ 	imes 10^4$ \ sec$$

Question 6

Which of the following is the correct scientific notation for 0.00254?

Accepted Answer

$$2.54 \ 	imes 10$$^{-3}$$

Question 7

A solution contains 10% ethanol by mass. If you have 25.0 L of this solution (density = $$0.71 \ \frac{kg}{L}$$), how many kilograms of ethanol are present?

Accepted Answer

$$1.78 \ kg$$

Question 8

Which of the following is an example of a chemical property?

Accepted Answer

Toxicity

Question 9

What is the correct conversion factor to use when converting from centimeters to meters?

Accepted Answer

$$1 \ m = 100 \ cm$$

Question 10

Which of the following best describes a homonuclear molecule?

Accepted Answer

A molecule comprised of two or more identical atoms.

Question 11

Convert 800 nm to Mm and report the answer in scientific notation.

Accepted Answer

$$8.00 \ 	imes 10$$^{-13}$$ \ Mm$$

Question 12

Which of the following is an intensive property?

Accepted Answer

Density

Question 13

A student records the following densities for water: 0.578, 0.579, 0.577. The true value is 1.000 g/mL. Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 14

Which of the following is the correct formula for converting Celsius to Fahrenheit?

Accepted Answer

$$^\circ F = \frac{9}{5}C + 32$$

Question 15

Which prefix represents $$10^{-9}$$?

Accepted Answer

nano

Question 16

A 3.00 L bottle weighs 1.70 kg when empty and 4.72 kg when filled with wine. The wine contains 11.5% ethanol by mass. How many grams of ethanol are present in 2.50 L of this wine?

Accepted Answer

$$28.75 \ g$$

Question 17

Which of the following is a correct statement about chemical compounds?

Accepted Answer

They are substances comprising two or more atoms, typically from different elements, joined by chemical bonds.

Question 18

Which of the following is the correct SI unit for temperature?

Accepted Answer

Kelvin

Question 19

What is the correct number of significant figures in the measurement 0.00270?

Accepted Answer

3

Question 20

Which of the following best describes a chemical change?

Accepted Answer

A change in chemical properties, such as combustion.

Fundamental Concepts and Measurements in General Chemistry

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