Question 1

A car travels at 3060 miles per hour. What is this speed in meters per second? (1 mi = 1.609 km)

Accepted Answer

1390 m/s

Question 2

What is the percent by mass of gold (Au) in $$Au_2I_3$$?

Accepted Answer

65.90%

Question 3

Which of the following oxyanions is incorrectly named?

Accepted Answer

$$SO_3$$^{2-}$$; sulfite

Question 4

Which of the following is an incorrect representation for a neutral atom?

Accepted Answer

$$^{40}_{29}Cu$$

Question 5

Which of the following acids is incorrectly named?

Accepted Answer

Perbromic Acid, HBrO$$_4$$

Question 6

How many total electrons are there in the chlorite anion?

Accepted Answer

20

Question 7

Which of the following must be present in an ion?

Accepted Answer

An electron

Question 8

What is the molar mass of potassium nitrite ($$KNO_2$$)?

Accepted Answer

93.0 g/mol

Question 9

For the reaction: $$CH_4(g$$) + $$Br_2(l$$) \rightarrow $$CBr_4(s) + $$HBr(g)$$, what is the coefficient for bromine (Br_2$) when the reaction is balanced?

Accepted Answer

4

Question 10

What is the percentage of nitrogen, by mass, in calcium nitrate ($$Ca(NO_3$)_2$$)?

Accepted Answer

17.1%

Question 11

Cyclohexane, a commonly used organic solvent, is 85.6% C and 14.4% H by mass. What is the empirical formula?

Accepted Answer

$$CH_2$$

Question 12

In the combustion of the hydrocarbon $$C_4H_{10}$$, what is the coefficient for $$O_2$$ when the reaction is balanced?

Accepted Answer

Question 13

Propane, $$C_3H_8$$, is a common fuel used for cooking and home heating. What mass of $$O_2 is $$consumed in the combustion of 1.00 g of propane?

Accepted Answer

3.63 g

Question 14

Molten gallium reacts with arsenic to form the semiconductor gallium arsenide, $$GaAs$$, used in light emitting diodes and solar cells: $$Ga(l) + As(s) \rightarrow GaAs(s). If 4.00 g of $$gallium is reacted with 5.50 g of arsenic, how many grams of the excess reactant are left at the end of the reaction?

Accepted Answer

1.20 g As

Question 15

Both titanium and lead have been used as whitening sources for paint. The density of titanium is 4.506 g/cm$$^3$$; the density of lead is 11.34 g/cm$$^3. $$How many times heavier would one expect 2 gallons of lead powder to be compared to 2 gallons of titanium powder?

Accepted Answer

2.517 times heavier

Question 16

An electron has a charge of $$1.602 	imes 10$$^{-19}$$ coulombs (C), a wire with a current of 4.0 amperes (C/s) moving through it has a frequency of how many Hz (s$$^{-1}$$)?

Accepted Answer

$$2.5 	imes 10$$^{19}$$ Hz

Question 17

In an alternate universe there are only two naturally occurring isotopes of iron: $$^{56}Fe (64.5$$% abundance) and $$^{62}Fe (35.5$$% abundance). Given this information, what is the atomic weight of iron in this alternate universe?

Accepted Answer

58.1 amu

Question 18

$$^{24}Mg is $$the most abundant isotope of Magnesium with 78.99% abundance. There are two additional naturally occurring Magnesium isotopes $$^{25}Mg$$ and $$^{26}Mg. $$What is the percent abundance of $$^{25}Mg$$? Assume the atomic masses are the mass numbers of each isotope.

Accepted Answer

11.5 %

Question 19

If 6.0 grams of Beryllium Fluoride is reacted with excess Aluminum Phosphate to give Beryllium Phosphate and AlF$$_3$$, how many grams of Beryllium Phosphate are produced?

Accepted Answer

9.2 grams

Question 20

How many moles are in 12.0 g of LiCl?

Accepted Answer

0.283 moles

General Chemistry 1201: Key Concepts and Problem-Solving Guide

Guida di studio - Domande di pratica

Study guide - Flashcard