Question 1

Which statement about atomic theory is incorrect?

Accepted Answer

A pure substance will have a varying relative number of atom types.

Question 2

Which statement about ionic compounds is NOT correct?

Accepted Answer

Ionic compounds are charged, they are not electrically neutral.

Question 3

Given the formula $$\mathrm{C_4H_8O_2}$$, what is the correct ratio of carbon to hydrogen to oxygen atoms?

Accepted Answer

2:4:1

Question 4

Which formula correctly represents a molecule with 4 phosphorus atoms and 10 oxygen atoms?

Accepted Answer

$$\mathrm{P_4O_{10}}$$

Question 5

Which pair of subatomic particles have charges of equal magnitude but opposite sign?

Accepted Answer

proton and electron

Question 6

The nucleus of an atom is:

Accepted Answer

about $$\frac{1}{10,000}$$ the size of the atom

Question 7

Why are atoms electrically neutral?

Accepted Answer

the atomic number equals the number of electrons

Question 8

For potassium ($$\mathrm{K}$$), which statement is correct?

Accepted Answer

contains more neutrons than electrons

Question 9

How many electrons and neutrons are present in $$\mathrm{^{25}Mg}$$?

Accepted Answer

12 electrons, 13 neutrons

Question 10

Isotopes of a given element:

Accepted Answer

have the same number of protons, but different mass numbers

Question 11

Iron is element number 26. What does this mean?

Accepted Answer

It has 26 protons inside its nucleus

Question 12

Which of the following was NOT a conclusion from the gold foil-alpha particle scattering experiment?

Accepted Answer

An atom's nucleus contains protons and neutrons.

Question 13

Which option correctly defines the octet rule? Atoms will ________ electrons so each atom involved will have a noble gas configuration.

Accepted Answer

lose, gain or share

Question 14

Which compound contains ions with a $$3+$$ charge?

Accepted Answer

$$\mathrm{AlP}$$

Question 15

What behavior is expected from an atom with the electronic configuration $$1s^22s^22$p^63s^23$p^6$$?

Accepted Answer

loss of 2 electrons

Question 16

Which of the following statements is NOT true of a redox reaction?

Accepted Answer

The reducing agent gains electrons.

Question 17

What is the oxidation number of Mn in $$\mathrm{$$KMnO_4$$}$$?

Accepted Answer

+7

Question 18

In which compound does Cl have an oxidation number of +7?

Accepted Answer

$$\mathrm{Al($$ClO_4$$)_3}$$

Question 19

In a redox reaction, the substance reduced:

Accepted Answer

always gains electrons

Question 20

In the redox reaction $$\mathrm{Al + $$MnO_2$$ \rightarrow Al_2O_3 + Mn}$$, what is the oxidizing agent?

Accepted Answer

Mn in $$\mathrm{$$MnO_2$$}$$

CHM 1025 Test 2 Review – Step-by-Step Chemistry Guidance

Study Guide - Practice Questions