Question 1

A hospital stores oxygen gas in large steel cylinders. If a cylinder is only partially filled, which statement best describes the volume and shape of the oxygen gas inside?

Accepted Answer

Its volume and shape are both determined by the container.

Question 2

Which of the following is an example of a pure compound used in everyday life?

Accepted Answer

Sugar, $$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$

Question 3

A patient receives 1.20 pounds of a medication intravenously. How many grams of medication did the patient receive? ($$1\ \mathrm{lb} = 454\ \mathrm{g})$$

Accepted Answer

$$378\ \mathrm{g}$$

Question 4

Which of the following measurements contains exactly three significant figures?

Accepted Answer

$$0.0250\ \mathrm{g}$$

Question 5

A laboratory technician subtracts $$115.972\ \mathrm{g}$$ from $$123.6\ \mathrm{g}. $$What is the result, expressed with the correct number of significant figures?

Accepted Answer

$$7.6\ \mathrm{g}$$

Question 6

A student multiplies $$1.2 by$$ $$1.222 on a $$calculator. What is the answer, reported with the correct number of significant figures?

Accepted Answer

$$1.5$$

Question 7

A sample of an imaginary element Xq contains $$20.0\%$$ $$^{100}\mathrm{Xq}$$ and $$80.0\%$$ $$^{102}\mathrm{Xq}. $$What is the atomic weight of Xq?

Accepted Answer

$$101.6\ \mathrm{amu}$$

Question 8

Which of the following best describes a neutron?

Accepted Answer

Approximate mass $$1\ \mathrm{amu}$$; charge $$0$$; inside nucleus

Question 9

A radioactive isotope of phosphorus, $$^{32}_{15}\mathrm{P}$$, undergoes beta emission. What is the product of this nuclear reaction?

Accepted Answer

$$^{32}_{16}\mathrm{S}$$

Question 10

A $$50.0\ \mathrm{g}$$ piece of metal requires $$26.5$$ calories to increase its temperature by $$5.00\ ^\circ\mathrm{C}. $$What is the specific heat of the metal?

Accepted Answer

$$0.106\ \mathrm{cal}/\mathrm{g}\ ^\circ\mathrm{C}$$

Question 11

Which of the following nuclear reactions is an example of alpha emission?

Accepted Answer

$$^{235}_{92}\mathrm{U} \$$rightarrow ^{4}$$_{2}\mathrm{He} $$+ ^{231}$$_{90}\mathrm{Th}$$

Question 12

A $$100.\ \mathrm{g}$$ sample of nickel-65 (half-life $$2.50$$ days) is left for $$7.50$$ days. How much remains?

Accepted Answer

$$12.5\ \mathrm{g}$$

Question 13

Which of the following elements is a noble gas?

Accepted Answer

Ne

Question 14

Which of the following best describes the process of nuclear fusion?

Accepted Answer

Several small nuclei combine to form an atom of greater atomic number.

Question 15

A solution has a density of $$1.60\ \mathrm{g}/\mathrm{mL}. $$What is the mass of $$30.0\ \mathrm{mL} of $$this solution?

Accepted Answer

$$48.0\ \mathrm{g}$$

Question 16

Which of the following elements all belong to the same group in the periodic table?

Accepted Answer

F, Cl, Br

Question 17

Which of the following best describes an alpha particle?

Accepted Answer

Charge $$+2$$; mass $$4\ \mathrm{amu}$$; low penetrating power

Question 18

Which part of the atom is most directly associated with radioactivity?

Accepted Answer

Nucleus

Question 19

What is the temperature $$-10.\ ^\circ\mathrm{C} in $$degrees Fahrenheit?

Accepted Answer

$$14\ ^\circ\mathrm{F}$$

Question 20

Which of the following statements about the maximum number of electrons in any orbital is correct?

Accepted Answer

2

General Chemistry Practice Exam 1 (Chapters 1-2, 11) – Guided Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard