Q: Which of the following is the correct formula for density?

$$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

A process that alters the composition of a substance, resulting in the formation of new materials with different properties.

Question 2

A student mixes two clear liquids and observes the formation of a solid precipitate. Which type of property or change is being observed?

Accepted Answer

Chemical change

Question 3

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

Accepted Answer

Density

Question 4

A sample of water is heated from $$25 \, ^\circ\mathrm{C} to$$ $$75 \, ^\circ\mathrm{C}. $$What is the temperature change in Kelvin?

Accepted Answer

$$50 \, \mathrm{K}$$

Question 5

Which of the following best describes a scientific law?

Accepted Answer

A summary of past observations that predicts future ones and cannot be broken.

Question 6

Which of the following is the correct formula to convert a temperature from degrees Fahrenheit to degrees Celsius?

Accepted Answer

$$^\circ\mathrm{C} = \frac{(^\circ\mathrm{F} - 32)}{1.8}$$

Question 7

A mixture of sand and salt is separated by adding water, stirring, and then filtering. Which type of mixture is being separated and what property is used?

Accepted Answer

Heterogeneous mixture; solubility

Question 8

Which of the following statements about scientific theories is correct?

Accepted Answer

They are general explanations for characteristics and behavior of nature that can never be conclusively proven.

Question 9

A student measures the mass of a metal sample as $$12.345 g$$, $$12.346 g$$, and $$12.344 g in $$three trials. The true mass is $$12.500 g. $$Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 10

Which of the following is a correct example of a physical property?

Accepted Answer

Boiling point

Question 11

A solution is made by dissolving $$10.0 g of $$NaCl in $$90.0 g of $$water. Which term best describes this mixture?

Accepted Answer

Homogeneous mixture

Question 12

Which of the following is the correct SI base unit for mass?

Accepted Answer

Kilogram ($$\mathrm{kg})$$

Question 13

Which of the following is an example of a derived unit?

Accepted Answer

Liter ($$\mathrm{L})$$

Question 14

A student records a measurement as $$0.004560 m. $$How many significant figures does this value have?

Accepted Answer

4

Question 15

Which of the following best describes the difference between an element and a compound?

Accepted Answer

An element cannot be chemically broken down into simpler substances, while a compound is composed of two or more elements in a fixed ratio.

Question 16

Which of the following is the correct formula for density?

Accepted Answer

$$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}$$

Question 17

A chemical reaction is represented by the following equation:

$$\mathrm{CH_4$(g) + 2\ O_2$(g) \rightarrow 3\ CO_2$(g) + 4\ H_2O(g)}$$

Which of the following statements is true about this reaction?

Accepted Answer

It is a chemical change because new substances with different properties are formed.

Question 18

Which of the following is the correct metric prefix and multiplier for 'micro-'?

Accepted Answer

Prefix: $$\mu$$; Multiplier: $$10^{-6}$$

Question 19

A student needs to convert $$250$$ milliliters ($$\mathrm{mL}) to $$liters ($$\mathrm{L}). $$Which of the following is the correct conversion and answer?

Accepted Answer

$$250\ \mathrm{mL} 	imes \frac{1\ \mathrm{L}}{1000\ \mathrm{mL}} = 0.250\ \mathrm{L}$$

Question 20

Which of the following best describes the difference between qualitative and quantitative data?

Accepted Answer

Qualitative data is descriptive, while quantitative data is numerical.

Matter, Measurement, and Problem Solving: Foundations of General Chemistry

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