Q: Calculate the frequency of visible light having a wavelength of $$486\ \mathrm{nm} ($$speed of light $$c = 3.0 \times 10^8$\ \mathrm{m/s}).$$

$$6.17 \times 10$$^{14}$$\ \mathrm{Hz}$$

Question 1

Which of the following is a chemical property of tin (Sn)?

Accepted Answer

Tin dissolves slowly in cold, dilute hydrochloric acid, but it dissolves readily in concentrated hydrochloric acid.

Question 2

How many micrometers are in 6.0 kilometers?

Accepted Answer

$$6.0 	imes 10^9$ micrometers

Question 3

Dry ice (solid CO$$_2) $$sublimes at $$-78.5\ ^\circ \mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$194.65\ \mathrm{K}$$

Question 4

A piece of metal with a mass of 114 g was placed into a graduated cylinder that contained 25.00 mL of water, raising the water level to 42.50 mL. What is the density of the metal?

Accepted Answer

$$6.51\ \mathrm{g/cm^3$}$$

Question 5

Radio waves travel at the speed of light, which is $$3.0 	imes 10^8$\ \mathrm{m/s}. $$How many minutes does it take for a radio message to reach Earth from Mars if Mars is $$9.9 	imes 10^7$\ \mathrm{km}$$ from Earth?

Accepted Answer

$$5.5$$ minutes

Question 6

Which is the correct formula for copper (II) phosphate?

Accepted Answer

$$\mathrm{Cu_3$(PO_4$)_2}$$

Question 7

The chemical name for ClO$$_2^- is $$chlorite ion. Therefore, the name of HClO$$_2 is$$:

Accepted Answer

Chlorous acid

Question 8

Which of the following is the formula for hydrobromic acid?

Accepted Answer

$$\mathrm{HBr}$$

Question 9

Calculate the frequency of visible light having a wavelength of $$486\ \mathrm{nm} ($$speed of light $$c = 3.0 	imes 10^8$\ \mathrm{m/s}).$$

Accepted Answer

$$6.17 	imes 10$$^{14}$$\ \mathrm{Hz}$$

Question 10

The number of orbitals in a d subshell is:

Accepted Answer

5

Question 11

Which element has the following ground-state electron configuration: $$[\mathrm{Kr}]4d$$^{10}$$5s^25p^4$?

Accepted Answer

Te

Question 12

How many electrons are there in the 2nd principal energy level ($$n=2) of a $$phosphorus atom?

Accepted Answer

8

Question 13

Which of the following is most likely to be a covalent compound?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 14

A compound contains 48.65% carbon, 8.108% hydrogen, and the remainder oxygen. The molecular mass of this compound is approximately 74.00 g/mol. What is the empirical formula?

Accepted Answer

$$\mathrm{C_3H_6O_2}$$

Question 15

Arrange the following in order of increasing first ionization energy: Na, Cl, Al, S, Cs.

Accepted Answer

Cs \u003c Na \u003c Al \u003c S \u003c Cl

Question 16

Which of the following best explains why the second ionization energy of sodium is much greater than the first?

Accepted Answer

The second electron is removed from a stable, noble gas configuration.

Question 17

Which of the following pairs of elements would you expect to have the most similar chemical properties?

Accepted Answer

Na and K

Question 18

What is the ground-state electron configuration for chlorine?

Accepted Answer

$$1s^22s^22$p^63s^23$p^5$$

Question 19

Which of the following ions has the largest ionic radius?

Accepted Answer

$$\mathrm{O$$^{2-}$$}$$

Question 20

A radioisotope of gallium, $$^{71}\mathrm{Ga}$$, has a natural abundance of 37.0%. $$^{69}\mathrm{Ga}$$ has an abundance of 62.1%. Calculate the average atomic mass of gallium.

Accepted Answer

$$69.72\ \mathrm{amu}$$

General Chemistry: Atomic Structure, Periodicity, Compounds, and Calculations – Study Guide

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