Question 1

A chemist reacts 178 g of chlorine with 124 g of phosphorus. After reaction, 124 g of phosphorus remains unreacted. What is the percent yield for the reaction:

$$\mathrm{P}_4 + 6\mathrm{Cl}_2 \rightarrow 4\mathrm{PCl}_3$$

Accepted Answer

$$87.5\%$$

Question 2

Read the length of the metal bar with the correct number of significant figures (see ruler image).

Accepted Answer

$$10.24\ \mathrm{cm}$$

Question 3

The combustion of hydrogen reacts $$2.0\ \mathrm{g} of $$hydrogen with $$16.0\ \mathrm{g} of $$oxygen to form a product with $$18.0\ \mathrm{g} of $$mass. Which law does this observation best illustrate?

Accepted Answer

Law of Conservation of Mass

Question 4

The temperature scale K (Kelvin), Celsius, and Fahrenheit are widely used. Which of the following correctly relates the temperature scales?

Accepted Answer

$$T_\mathrm{K} = T_\mathrm{C} + 273.15$$

Question 5

If a sample is uniform throughout, cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical processes, it is called a(n):

Accepted Answer

Compound

Question 6

What group of elements does the shaded area in the following periodic table indicate? (see image)

Accepted Answer

Metals

Question 7

The law of constant composition applies to:

Accepted Answer

Compounds

Question 8

The density of silver is $$10.5\ \mathrm{g/cm}^3. A $$piece of silver with a mass of $$52.5\ \mathrm{g}$$ would occupy a volume of:

Accepted Answer

$$5.00\ \mathrm{cm}^3$$

Question 9

The number $$1.4060 	imes 10^4$ has how many significant figures?

Accepted Answer

5

Question 10

Which of the following are chemical processes?
1. Peeling of a nail
2. Freezing of water
3. Decomposition of sodium hydrogen carbonate
4. Consumption of oxygen gas

Accepted Answer

3 and 4

Question 11

Which of the following is an intensive property?

Accepted Answer

Density

Question 12

Accuracy refers to:

Accepted Answer

How close a measured number is to the true value

Question 13

Elements in Group 7A are known as the:

Accepted Answer

Halogens

Question 14

Which pair of atoms constitutes a pair of isotopes?

Accepted Answer

$$^{12}_6\mathrm{C}$$ and $$^{14}_6\mathrm{C}$$

Question 15

The chemical formula for stannous nitride is:

Accepted Answer

$$\mathrm{Sn}_3\mathrm{N}_2$$

Question 16

The correct name for $$\mathrm{Al}_2(\mathrm{SO}_4)_3 is$$:

Accepted Answer

Aluminum sulfate

Question 17

The correct name for $$\mathrm{HClO}_3 is$$:

Accepted Answer

Chloric acid

Question 18

What is the formula for carbon disulfide?

Accepted Answer

$$\mathrm{CS}_2$$

Question 19

The element X has three naturally occurring isotopes. The isotopes have the following masses and abundances:

Isotope 1: $$10.0129\ \mathrm{amu}$$, $$19.91\%$$
Isotope 2: $$11.0093\ \mathrm{amu}$$, $$80.09\%$$

What is the average atomic mass of element X?

Accepted Answer

$$10.81\ \mathrm{amu}$$

Question 20

Which combination of protons, neutrons, and electrons is correct for the isotope of element K, $$^{39}_{19}\mathrm{K}$$?

Accepted Answer

19 protons, 20 neutrons, 19 electrons

General Chemistry Fundamentals: Concepts, Calculations, and Applications

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