$$(0.75 \times 35) + (0.25 \times 37) = 35.5$$ amu

Question 1

Which of the following best describes the scientific method?

Accepted Answer

A process involving observation, hypothesis, experimentation, and conclusion.

Question 2

Which of the following is NOT considered a chemical?

Accepted Answer

Heat from a flame

Question 3

Which element is a representative element on the periodic table?

Accepted Answer

Sodium (Na)

Question 4

Where are the transition metals located on the periodic table?

Accepted Answer

In the center block, groups 3-12

Question 5

Which of the following statements about metals is TRUE?

Accepted Answer

Metals are generally good conductors of electricity.

Question 6

Which group on the periodic table contains the most reactive nonmetals?

Accepted Answer

Group 17 (Halogens)

Question 7

An atom of chlorine has an atomic number of 17 and a mass number of 35. How many neutrons does it have?

Accepted Answer

$$35 - 17 = 18$$ neutrons

Question 8

Which of the following isotopes of magnesium is most abundant if the atomic mass of magnesium is 24.3 amu?

Accepted Answer

$$^{24}\mathrm{Mg}$$

Question 9

A neutral atom of calcium has 20 protons. How many electrons does it have?

Accepted Answer

20 electrons

Question 10

Which of the following ions is formed when an atom loses two electrons?

Accepted Answer

$$\mathrm{Ca}^{2+}$$

Question 11

What is the correct formula for the ionic compound formed between magnesium and nitrate?

Accepted Answer

$$\mathrm{Mg(NO_3$)_2}$$

Question 12

Which of the following is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 13

A patient is given a medication containing $$\mathrm{K^+}$$ ions. What type of ion is $$\mathrm{K^+}$$?

Accepted Answer

A cation formed by losing one electron

Question 14

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{Na_2SO_4}$$

Question 15

If an atom has 15 protons, 16 neutrons, and 18 electrons, what is its atomic symbol with charge?

Accepted Answer

$$^{31}\mathrm{P}^{3-}$$

Question 16

Which of the following statements about ionic compounds is TRUE?

Accepted Answer

The net charge of an ionic compound is zero.

Question 17

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 18

Which of the following is the correct formula for the compound formed between aluminum and sulfate?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 19

A sample contains two isotopes of chlorine: $$^{35}\mathrm{Cl} (75$$%) and $$^{37}\mathrm{Cl} (25$$%). What is the average atomic mass?

Accepted Answer

$$(0.75 	imes 35) + (0.25 	imes 37) = 35.5$$ amu

Question 20

Which of the following is the correct name for $$\mathrm{$$CuSO_4$$}$$?

Accepted Answer

Copper(II) sulfate

Exam #1 Review: Chemistry Fundamentals, Atoms & Elements, Ionic Compounds

Guida di studio - Domande di pratica