Ion Quiz
Questions: 16 · 10 minutes
1. Aluminum ions have a charge of 3+, and oxide ions have a charge of 2−. Which formula represents a neutral compound made from these ions?
AlO, with one aluminum ion and one oxide ion
Al₃O₂, with three aluminum ions and two oxide ions
Al₂O₃, with two aluminum ions and three oxide ions
AlO₃, with one aluminum ion and three oxide ions
2. In FeCl₃, each chloride ion has a charge of 1−. What is the charge on the iron ion?
A positive-one charge, written Fe⁺
A positive-three charge, written Fe³⁺
A positive-two charge, written Fe²⁺
A negative-three charge, written Fe³⁻
3. Calcium ions are Ca²⁺ and phosphate ions are PO₄³⁻. Which formula has an overall charge of zero?
Ca₃(PO₄)₂, with three calcium ions and two phosphate ions
Ca₂PO₄, with two calcium ions and one phosphate ion
Ca₃PO₄, with three calcium ions and one phosphate ion
CaPO₄, with one calcium ion and one phosphate ion
4. A neutral chlorine atom has 17 electrons. How many electrons are in a chloride ion, Cl⁻?
18 electrons
17 electrons
16 electrons
19 electrons
5. An oxygen atom has six valence electrons. Which change usually gives it a full outer shell when forming a monatomic ion?
Losing one electron to form O⁺
Gaining two electrons to form O²⁻
Losing two electrons to form O²⁺
Gaining one electron to form O⁻
6. During electrolysis, where do positively charged ions move?
Toward the positive electrode, called the anode
Toward both electrodes equally
Toward the negative electrode, called the cathode
Away from both electrodes and into the center
7. Calcium forms Ca²⁺ ions and fluorine forms F⁻ ions. What is the neutral formula for calcium fluoride?
CaF₂, containing one calcium ion for every two fluoride ions
Ca₂F, containing two calcium ions for every fluoride ion
CaF, containing equal numbers of calcium and fluoride ions
Ca₂F₂, an unreduced two-to-two ratio of calcium and fluoride ions
8. A neutral sodium atom has 11 protons and 11 electrons. After it forms Na⁺, how many electrons does it have?
9 electrons
10 electrons
11 electrons
12 electrons
9. Which change turns a neutral atom into an ion without changing which element it is?
Changing its number of protons
Changing its atomic number
Changing the identity of its nucleus
Changing its number of electrons
10. When an acid transfers a proton to water, which positive ion is produced directly?
H₃O⁺, the hydronium ion
OH⁻, the hydroxide ion
O²⁻, the oxide ion
H₂⁻, a negatively charged hydrogen species
11. Which statement best defines an ion?
An atom whose nucleus contains equal numbers of protons and neutrons
An atom or group of atoms with a net electric charge
A substance composed only of metallic atoms
A molecule that cannot participate in chemical reactions
12. Why can a molten ionic compound conduct electricity?
Its nuclei move freely from one atom to another
Its atoms become radioactive when heated
Its ions lose all charge when the solid melts
Its ions can move and carry charge through the liquid
13. How does a neutral magnesium atom usually form Mg²⁺?
It gains two protons
It gains two electrons
It loses two protons
It loses two electrons
14. Which pair has the same number of electrons?
A neutral sodium atom and a sodium ion, Na and Na⁺
A chloride ion and an argon ion, Cl⁻ and Ar⁺
A neutral neon atom and a sodium ion, Ne and Na⁺
A magnesium ion and a neon ion, Mg²⁺ and Ne⁻
15. What is a cation?
An ion with more electrons than protons
An ion formed only from a nonmetal
A neutral group of covalently bonded atoms
A positively charged ion
16. Which notation represents the nitrate ion?
NO₂⁻, the nitrite ion
NH₄⁺, the ammonium ion
NO₃⁻, the nitrate ion
SO₄²⁻, the sulfate ion