Q: Which pair of atoms constitutes a pair of isotopes?

$$^{12}_{6}\text{C}$$ and $$^{14}_{6}\text{C}$$

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 $$P_4 + 6Cl_2$$ \rightarrow 4PCl_3$$?

Accepted Answer

$$74.6\%$$

Question 2

Read the length of the metal bar with the correct number of significant figures from the provided ruler image.

Accepted Answer

$$10.2\ 	ext{cm}$$

Question 3

The reaction that binds 2 g of hydrogen with 16 g of oxygen to form a product with only one phase is an example of:

Accepted Answer

A compound

Question 4

The emergency uses of KClO$$_3 ($$potassium chlorate) include its use as an oxidizer. Which of the following correctly shows the temperature relationship for solubility?

Accepted Answer

As temperature increases, solubility increases.

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 periodic table indicate?

Accepted Answer

Metals

Question 7

The law of constant composition applies to:

Accepted Answer

Compounds

Question 8

The density of silver is $$10.5\ 	ext{g/cm}^3. A $$piece of silver with a mass of $$52.0\ 	ext{g}$$ would occupy a volume of:

Accepted Answer

$$4.95\ 	ext{cm}^3$$

Question 9

The number $$1.406\$$times10^3$$ has how many significant figures?

Accepted Answer

4

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

Temperature

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

$$^{12}_{6}	ext{C}$$ and $$^{14}_{6}	ext{C}$$

Question 15

The chemical formula for stannous nitride is:

Accepted Answer

$$Sn_3N_2$$

Question 16

The correct name for $$Al_2O_3 is$$:

Accepted Answer

Aluminum oxide

Question 17

The correct name for $$HClO_3 is$$:

Accepted Answer

Chloric acid

Question 18

What is the formula for carbon dioxide?

Accepted Answer

$$CO_2$$

Question 19

The element X has three naturally occurring isotopes. The isotopes have listed % abundances and masses in the table below. What is the average weighted atomic mass of element X?
Isotope | % Abundance | Mass (u)
A | 34.1 | 134.9
B | 42.3 | 136.9
C | 23.6 | 137.9

Accepted Answer

$$136.7\ 	ext{u}$$

Question 20

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

Accepted Answer

19 protons, 20 neutrons, 19 electrons

General Chemistry Fundamentals: Concepts, Calculations, and Applications

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