Question 1

Which of the following statements best describes a pure substance?

Accepted Answer

A material that contains only one type of atom or molecule throughout.

Question 2

Which element is represented by the symbol $$ \mathrm{Sn} $$?

Accepted Answer

Tin

Question 3

Which of the following best describes the arrangement of the periodic table?

Accepted Answer

Elements are arranged in order of increasing atomic number in rows (periods) and columns (groups) based on similar properties.

Question 4

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 5

Which of the following elements is a metalloid?

Accepted Answer

Silicon ($$ \mathrm{Si} )$$

Question 6

An atom has an atomic number of 17 and a mass number of 37. How many neutrons does it have?

Accepted Answer

$$ 20 $$

Question 7

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 8

Which of the following best describes the trend in atomic size across a period from left to right?

Accepted Answer

Atomic size decreases due to increasing nuclear charge.

Question 9

Which element would have the highest ionization energy among the following?

Accepted Answer

Neon ($$ \mathrm{Ne} )$$

Question 10

What is the charge on the ion formed by magnesium ($$ \mathrm{Mg} $$)?

Accepted Answer

$$ 2+ $$

Question 11

Which of the following compounds is formed from the ions $$ \mathrm{Na^+} $$ and $$ \mathrm{OH^-} $$?

Accepted Answer

Sodium hydroxide ($$ \mathrm{NaOH} )$$

Question 12

Which of the following best explains why ionic compounds have high melting points?

Accepted Answer

Strong electrostatic forces hold the ions together in a lattice.

Question 13

Which of the following is the correct electron dot structure for chlorine ($$ \mathrm{Cl} $$)?

Accepted Answer

$$ \mathrm{Cl} $$ with 7 dots around it

Question 14

Which of the following elements forms a diatomic molecule in its natural state?

Accepted Answer

Oxygen ($$ \mathrm{O_2$} )$$

Question 15

How many covalent bonds will nitrogen ($$ \mathrm{N} ) $$typically form?

Accepted Answer

$$ 3 $$

Question 16

Which of the following best describes a cation?

Accepted Answer

An ion with a positive charge formed by losing electrons.

Question 17

Given the electronegativity values $$ \mathrm{H} = 2.1 $$ and $$ \mathrm{O} = 3.5 $$, what type of bond is present in $$ \mathrm{H_2O} $$?

Accepted Answer

Polar covalent

Question 18

Which of the following is the correct formula for the compound formed between iron(III) and hydroxide ions?

Accepted Answer

$$ \mathrm{Fe(OH)_3} $$

Question 19

A patient is given a medication containing ammonium chloride. What is the formula and charge of the ammonium ion?

Accepted Answer

$$ \mathrm{NH_4$^+} $$

Question 20

Which of the following best explains why elements form chemical bonds?

Accepted Answer

To achieve a stable electron configuration, often an octet in their outer shell.

Atoms, Elements, and Chemical Bonding: Study Guide

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