Q: Convert 0.00056 meters to scientific notation.

$$5.6 \times 10$$^{-4}$$\ \mathrm{m}$$

Q: Which of the following is the correct scientific notation for 0.000 000 486 m?

$$4.86 \times 10$$^{-7}$$\ \mathrm{m}$$

Q: Which of the following is a correct conversion for 1 kilometer to meters using SI prefixes?

$$1\ \mathrm{km} = 1 \times 10$$^{3}$$\ \mathrm{m}$$

Q: A laboratory experiment requires you to convert 2.45 L to mL. Which of the following is the correct conversion?

$$2.45\ \mathrm{L} \times \frac{1000\ \mathrm{mL}}{1\ \mathrm{L}} = 2450\ \mathrm{mL}$$

Question 1

Which of the following best describes the law of conservation of mass?

Accepted Answer

The total mass of a system remains constant during any process.

Question 2

A 2.50 g sample of magnesium reacts with 2.00 g of oxygen to form magnesium oxide. After the reaction, 0.30 g of oxygen remains unreacted. According to the law of conservation of mass, what is the mass of magnesium oxide formed?

Accepted Answer

$$2.50\ \mathrm{g} + 2.00\ \mathrm{g} - 0.30\ \mathrm{g} = 4.20\ \mathrm{g}$$

Question 3

Which of the following is a chemical change?

Accepted Answer

Burning wood in a fireplace

Question 4

Which of the following is a physical property?

Accepted Answer

Density of sodium metal

Question 5

Which of the following is a derived SI unit?

Accepted Answer

$$\mathrm{kg/m^3$} ($$density)

Question 6

Convert 0.00056 meters to scientific notation.

Accepted Answer

$$5.6 	imes 10$$^{-4}$$\ \mathrm{m}$$

Question 7

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with uniform composition throughout

Question 8

Which SI prefix corresponds to $$10^{-6}$$?

Accepted Answer

Micro ($$\mu)$$

Question 9

A student measures the length of a table as 1.250 m. How many significant figures are in this measurement?

Accepted Answer

4

Question 10

Which of the following is an exact number?

Accepted Answer

1 dozen = 12

Question 11

A sample has a mass of 12.0 g and a volume of 8.0 cm$$^3. $$What is its density in g/cm$$^3$$?

Accepted Answer

$$\frac{12.0\ \mathrm{g}}{8.0\ \mathrm{cm}^3} = 1.5\ \mathrm{g/cm}^3$$

Question 12

Which of the following is the correct scientific notation for 0.000 000 486 m?

Accepted Answer

$$4.86 	imes 10$$^{-7}$$\ \mathrm{m}$$

Question 13

A measurement is recorded as 0.02050 g. How many significant figures does this value have?

Accepted Answer

4

Question 14

Which of the following is a correct conversion for 1 kilometer to meters using SI prefixes?

Accepted Answer

$$1\ \mathrm{km} = 1 	imes 10$$^{3}$$\ \mathrm{m}$$

Question 15

A laboratory experiment requires you to convert 2.45 L to mL. Which of the following is the correct conversion?

Accepted Answer

$$2.45\ \mathrm{L} 	imes \frac{1000\ \mathrm{mL}}{1\ \mathrm{L}} = 2450\ \mathrm{mL}$$

Question 16

Which of the following statements about the states of matter is correct?

Accepted Answer

Liquids have a definite volume but no definite shape.

Question 17

A student adds 2.50 g of sodium metal to water and observes a vigorous reaction. Which type of property is being observed?

Accepted Answer

Chemical property

Question 18

Which of the following is the correct way to round the result of $$3.2903 	imes 3.1 to $$the correct number of significant figures?

Accepted Answer

$$3.3 (2 $$significant figures, because 3.1 has 2 sig figs)

Question 19

A space shuttle uses 227,641 lb of liquid hydrogen during takeoff. The density of liquid hydrogen is $$0.07085\ \mathrm{g/cm}^3. $$What is the volume of liquid hydrogen in liters? (1 lb = 453.59237 g, 1 L = 1000 cm$$^3)$$

Accepted Answer

$$\frac{227641\ \mathrm{lb} 	imes 453.59237\ \mathrm{g/lb}}{0.07085\ \mathrm{g/cm}^3} 	imes \frac{1\ \mathrm{cm}^3}{1\ \mathrm{mL}} 	imes \frac{1\ \mathrm{mL}}{0.001\ \mathrm{L}} = 1.46 	imes 10^9$\ \mathrm{L}$$

Fundamental Concepts and Measurements in General Chemistry

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