Q: Which of the following is a correct example of dimensional analysis for converting 25.0 cm to meters?

$$25.0\ \mathrm{cm} \times \frac{1\ \mathrm{m}}{100\ \mathrm{cm}} = 0.250\ \mathrm{m}$$

Q: Which of the following is the correct dimensional analysis setup to convert 5.0 km to meters?

$$5.0\ \mathrm{km} \times \frac{1000\ \mathrm{m}}{1\ \mathrm{km}}$$

Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in fixed proportions.

Question 2

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

Accepted Answer

Flammability

Question 3

A student measures the mass of a sample as 12.30 g and its volume as 4.10 mL. What is the density of the sample, and how many significant figures should the answer have?

Accepted Answer

$$3.00\ \mathrm{g/mL}$$, 3 significant figures

Question 4

Which of the following statements about mixtures is correct?

Accepted Answer

Mixtures can be separated into their components by physical means.

Question 5

Which SI base unit is correctly matched with its quantity?

Accepted Answer

Meter (m) – length

Question 6

A balloon is filled with 2.50 L of helium gas at room temperature. If the temperature is increased and the volume expands to 3.00 L, which type of property is being observed?

Accepted Answer

Extensive physical property

Question 7

Which of the following is a correct example of dimensional analysis for converting 25.0 cm to meters?

Accepted Answer

$$25.0\ \mathrm{cm} 	imes \frac{1\ \mathrm{m}}{100\ \mathrm{cm}} = 0.250\ \mathrm{m}$$

Question 8

Which of the following best describes the scientific method?

Accepted Answer

A systematic approach involving observation, hypothesis, experimentation, and theory development.

Question 9

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 10

A sample of acetic acid has a mass of 10.0 g and a volume of 9.52 mL. What is its density?

Accepted Answer

$$1.05\ \mathrm{g/mL}$$

Question 11

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 12

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 13

Which of the following is the correct SI prefix for $$10^{-6}$$?

Accepted Answer

Micro-

Question 14

Which of the following best explains why chemistry is important in medicine?

Accepted Answer

It helps us understand the chemical processes in the human body and develop pharmaceuticals.

Question 15

Which of the following is a correct statement about energy changes in chemical reactions?

Accepted Answer

Energy can be either absorbed or released during chemical changes.

Question 16

A student records the temperature of a solution as 25.0 $$^0C. $$What is this temperature in Kelvin?

Accepted Answer

$$298.15\ \mathrm{K}$$

Question 17

Which of the following is a qualitative observation?

Accepted Answer

The liquid turned blue.

Question 18

Which of the following is the correct number of significant figures in the measurement 0.00450 g?

Accepted Answer

3

Question 19

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with uniform composition throughout.

Question 20

Which of the following is the correct dimensional analysis setup to convert 5.0 km to meters?

Accepted Answer

$$5.0\ \mathrm{km} 	imes \frac{1000\ \mathrm{m}}{1\ \mathrm{km}}$$

Essential Ideas in General Chemistry: Matter, Measurement, and Scientific Method

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