Q: Which of the following is a correct statement about scientific notation?

$$0.00056$$ written in scientific notation is $$5.6 \times 10$$^{-4}$$

Question 1

Which of the following best describes a physical change?

Accepted Answer

Dissolving table salt in water

Question 2

A student separates a mixture of sand and salt by first adding water, then filtering, and finally evaporating the filtrate. Which separation techniques are used in this process?

Accepted Answer

Filtration and evaporation

Question 3

Which statement about Dalton’s Atomic Theory is NOT correct according to modern understanding?

Accepted Answer

Atoms of the same element have identical properties

Question 4

A sample contains 60% $$^{35}\mathrm{Cl}$$ and 40% $$^{37}\mathrm{Cl}. $$What is the average atomic mass of chlorine? ($$^{35}\mathrm{Cl} = 34.97 $$amu, $$^{37}\mathrm{Cl} = 36.97 $$amu)

Accepted Answer

$$35.57\ \mathrm{amu}$$

Question 5

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

Question 6

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 7

Which of the following pairs of elements are both diatomic in their natural state?

Accepted Answer

Nitrogen and Oxygen

Question 8

A student measures the mass of a liquid as $$12.5\ \mathrm{g}$$ and its volume as $$8.0\ \mathrm{mL}. $$What is the density of the liquid?

Accepted Answer

$$1.56\ \mathrm{g/mL}$$

Question 9

Which of the following is NOT a correct statement about ions?

Accepted Answer

An atom that gains electrons becomes a cation

Question 10

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

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 11

A sample contains $$2.0\ \mathrm{mol} of$$ $$\mathrm{NaCl}. $$How many formula units of $$\mathrm{NaCl}$$ are present? ($$N_A = 6.022 	imes 10$$^{23}$$\ \mathrm{mol}^{-1})$$

Accepted Answer

$$1.204 	imes 10$$^{24}$$

Question 12

Which of the following best explains the result of Rutherford’s gold foil experiment?

Accepted Answer

Atoms are mostly empty space with a small, dense nucleus

Question 13

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons

Question 14

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 15

A student needs to convert $$25.0\ \mathrm{cm} to $$inches. (Given: $$1\ \mathrm{in} = 2.54\ \mathrm{cm}) $$What is the correct value in inches?

Accepted Answer

$$9.84\ \mathrm{in}$$

Question 16

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

Accepted Answer

$$0.00056$$ written in scientific notation is $$5.6 	imes 10$$^{-4}$$

Question 17

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 18

A $$5.00\ \mathrm{g}$$ sample of methane ($$\mathrm{CH_4$}) is $$burned in excess oxygen. How many grams of $$\mathrm{CO_2$}$$ are produced? ($$\mathrm{CH_4$} + 2\mathrm{O_2$} \rightarrow \mathrm{CO_2$} + 2\mathrm{H_2O}$$; molar masses: $$\mathrm{CH_4$} = 16.0\ \mathrm{g/mol}$$, $$\mathrm{CO_2$} = 44.0\ \mathrm{g/mol})$$

Accepted Answer

$$13.8\ \mathrm{g}$$

Question 19

Which of the following is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 20

Which of the following is NOT a diatomic element?

Accepted Answer

Sulfur

General Chemistry Exam Study Guide: Chapters 1–3

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드