Q: Which of the following is a correct conversion factor for length?

$$1 \text{ in} = 2.54 \text{ cm}$$

Question 1

Which of the following best describes a scientific law?

Accepted Answer

A mathematical statement that describes a relationship between phenomena under certain conditions.

Question 2

Which of the following is a chemical property?

Accepted Answer

Reactivity with hydrochloric acid

Question 3

A mixture of sand and salt can be separated by:

Accepted Answer

Filtration followed by evaporation

Question 4

Which of the following is a correct example of a polyatomic ion?

Accepted Answer

SO$$_4^{2-}$$

Question 5

Which statement about significant figures is correct?

Accepted Answer

Zeros to the right of the last nonzero digit are significant if the number has a decimal point.

Question 6

What is the correct answer to $$4.56 	imes 10^3$ 	imes 2.3 	imes 10^2$ using scientific notation and significant figures?

Accepted Answer

$$1.05 	imes 10^6$

Question 7

Which of the following is a physical change?

Accepted Answer

Melting of ice

Question 8

A student measures the mass of a solution as 14.32 g and its density as 1.345 g/mL. What is the volume of the solution, reported to the correct number of significant figures?

Accepted Answer

$$10.6 mL$$

Question 9

Which of the following is NOT a compound?

Accepted Answer

O$$_2$$

Question 10

Which group contains only elements that are classified as metals?

Accepted Answer

Group 2: Be, Mg, Ca, Sr

Question 11

Which of the following ions is a cation?

Accepted Answer

Fe$$^{3+}$$

Question 12

Which of the following is the correct formula for ammonium ion?

Accepted Answer

NH$$_4^{+}$$

Question 13

Which of the following is a correct statement about compounds?

Accepted Answer

Compounds have fixed proportions of their constituent elements.

Question 14

Which of the following is a correct conversion factor for length?

Accepted Answer

$$1 	ext{ in} = 2.54 	ext{ cm}$$

Question 15

Which of the following is a correct statement about ions?

Accepted Answer

Cations are positively charged.

Question 16

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

Accepted Answer

Melting point

Question 17

Which of the following is the correct formula for the chromate ion?

Accepted Answer

CrO$$_4^{2-}$$

Question 18

Which of the following is the correct scientific notation for 0.000123?

Accepted Answer

$$1.23 	imes 10$$^{-4}$$

Question 19

Which of the following is a correct statement about the scientific method?

Accepted Answer

It involves making observations, forming hypotheses, and testing them.

Question 20

Which of the following is the correct formula for the sulfate ion?

Accepted Answer

SO$$_4^{2-}$$

Matter and Measurements: Foundations of General Chemistry

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