Question 1

Which of the following represents the balanced nuclear equation for the beta plus decay (positron emission) of $$^{11}\mathrm{C}$$?

Accepted Answer

$$^{11}\mathrm{C} \$$rightarrow ^{11}$$\mathrm{B} $$+ ^{0}$$_{+1}\mathrm{e}$$

Question 2

Which class of organic compound is least likely to be used as an organic solvent?

Accepted Answer

Carboxylic acid

Question 3

Which type of radiation do people try to protect themselves from by wearing protective clothing that is made of lead?

Accepted Answer

Gamma radiation

Question 4

Which of the following is NOT a benefit of drawing Lewis structures?

Accepted Answer

They help determine the atomic masses in molecules.

Question 5

Which of the following best describes sodium hydroxide according to the MSDS if it has a health rating of 3, a flammability rating of 0, and a reactivity rating of 1?

Accepted Answer

Highly corrosive but not highly flammable

Question 6

Which element has an ion that is smaller than an ion of calcium?

Accepted Answer

Magnesium

Question 7

What is the electron configuration for the helium (He) atom?

Accepted Answer

$$1s^2$$

Question 8

A hydrocarbon has a molar mass of 180 g/mol and its empirical formula is $$CH_2. $$What is its molecular formula?

Accepted Answer

$$C_{12}H$$_{24}$$

Question 9

Which compound most likely contains polar covalent bonds?

Accepted Answer

$$NH_3$$

Question 10

Which best describes fission nuclear reactions?

Accepted Answer

They involve the splitting of heavy atomic nuclei into smaller fragments.

Question 11

Which statement describes heterogeneous mixtures?

Accepted Answer

They are made up of two or more pure substances that are not chemically bonded together and appear non-uniform.

Question 12

Which radiation detection method creates visible trails that can show the direction of ionizing particles?

Accepted Answer

Cloud chamber

Question 13

A sample of sodium metal can be described as:

Accepted Answer

A pure substance that is an element.

Question 14

Which property is the best one to use for the identification of an element?

Accepted Answer

The number of protons in the nucleus

Question 15

Based on its location in the periodic table, what can most likely be predicted about sulfur?

Accepted Answer

It has six valence electrons available for bonding.

Question 16

The independent variable is typically placed on the ____ axis of a graph.

Accepted Answer

x

Question 17

What is the value of $$x in$$ $$CH_3$$($$CH_2)_$$xCH_3$$ if the name of the hydrocarbon is heptane?

Accepted Answer

5

Question 18

Which of the following is a mathematical way of showing accuracy?

Accepted Answer

Percent error

Question 19

A radioactive decay of a radium-226 nucleus ($$^{226}\mathrm{Ra}) $$emits an alpha particle and produces an isotope of radon ($$^{222}\mathrm{Rn}). $$What is the balanced nuclear equation for this reaction?

Accepted Answer

$$^{226}\mathrm{Ra} \$$rightarrow ^{222}$$\mathrm{Rn} $$+ ^{4}$$_{2}\mathrm{He}$$

General Chemistry Cumulative Exam Study Guide

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