Chemistry Reactions Test

Write the net ionic equation for this molecular equation and name the spectator ion(s): Mg(s) + ZnCl2(aq) = MgCl2(aq) + Zn(s)

Mg + Zn^+2 = Mg^+2 + Zn Cl^-

Classify the reaction: HCl (aq) + NaOH = NaCl (aq) + H2O

Neutralization

Find the charge of O2

No charge

Predict if the following reaction will occur: Cu + FeNO3 = ...

No, bc the less reactive metal is an atom.

Find the charge of each element in SO4^2-

S = +6 O = -8

Classify the reaction: 2HCl + Zn = H2 + ZnCl2

Single Displacement

Precipitation Reaction

The formation of an insoluble solid when two solutions are combined. Redox always occurs.

Reduction

The gain of electrons during a reaction by a molecule, atom or ion. (ion reacts and becomes an atom(-))

Oxidation

The loss of electrons during a reaction by a molecule, atom or ion. (atom reacts and becomes an ion(+))

Double displacement reaction

Two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products. Redox can never occur.

Combination synthesis reaction

Two or more elements or compounds combine to form a single compound. Redox always occurs.

Combustion reaction

When oxygen reacts with another substance and gives off heat and light. When organic molecules combust the reaction products are carbon dioxide and water (as well as heat). Redox always occurs.

Predict if the following reaction will occur: Mg (s) + CuSO4 (aq) = ...

Yes: Mg(s) + CuSO4(aq) = Cu(s) + MgSO4(aq)

Find the charge of each element in CuNO3

[x is nitrogen] 1 + x + 3(-2) = 0 1 + x - 6 = 0 x = 5 Cu = +1 N = +5 O = -2

Translate this word equation into a molecular equation, then balance it: Hydrogen chloride + Magnesium = Magnesium Chloride + Hydrogen

2HCl + Mg = MgCl2 + H2

Write the net ionic equation for this molecular equation and name the spectator ion(s): AgNO3(aq) + KI(aq) = AgI(s) + NaNO3(aq)

Ag^+ (aq) + I^- (aq) = AgI(s) NO3^- & K^+

Neutralization Reaction

Also double displacement reactions, are when an acid and a base are mixed to create salt and water. Redox reaction doesn't occur.

Single displacement reaction

An element reacts with a compound and takes the place of another element in that compound. Redox always occurs.

Reactive metals in equations rules

1. The more reactive metal (initially) must be an atom for the reaction to occur 2. The less reactive metal (initially) must be an ion for the reaction to occur

Redox

A process where one substance or molecule is reduced and another oxidized.

Decomposition reaction

A single compound breaks down into two or more elements or new compounds. Redox always occurs.

Write balanced chemical equations with state symbols for the following, then classify each equation: Propane gas (C3H8) reacts with oxygen in the air to form carbon dioxide and water vapor

Balanced equation: C3H8(g) + 5O2(g) = 3CO2(g) + 4H2O(g) Classification: Redox and combustion

Write balanced chemical equations with state symbols for the following, then classify each equation: Iron (II) sulfide reacts with hydrochloric acid to form iron (II) chloride and hydrogen sulfide

Balanced equation: FeS(s) + 2HCl(aq) = FeCl2(aq) + H2S(aq) Classification: Double displacement

Write balanced chemical equations with state symbols for the following, then classify each equation: Hydrogen bromide reacts with potassium hydroxide to form salt/potassium bromide and water/dihydrogen oxide

Balanced equation: HBr (aq) + KOH (aq) = KBr (aq) + H2O (l) Classification: Neutralization

Write balanced chemical equations with state symbols for the following, then classify each equation: When magnesium metal is added to water, hydrogen gas is produced along with a solution of magnesium hydroxide

Balanced equation: Mg(s) + 2H2O(l) = Mg(OH)2(aq) + H2(g) Classification: Single Displacement & Redox

Write balanced chemical equations with state symbols for the following, then classify each equation: Aqueous hydrogen peroxide breaks down to form liquid water and gaseous oxygen

Balanced equation: 2H2O2(aq) = 2H2O(l) + O2(g) Classification: Redox and decomposition

Balance the equation then translate it into a word equation: C3H8 + O2 = CO2 + H2O

C3H8 + 5O2 = 3CO2 + 4H2O Propane + Oxygen = Carbon dioxide + Dihydrogen oxide

Classify the reaction: 2Na + Cl2 = 2NaCl

Combination synthesis

Classify the reaction: CH3OH + O2 = CO2 + 2H20

Combustion

Classify the reaction: 2H2O = 2H + O2

Decomposition

Classify the following equation (What is being reduced/oxidized, type of reaction): 2HCl(g) = H2(g) + Cl2(g)

Decomposition Redox H is being reduced Cl is being oxidized

Classify the reaction: AgNO3 + NaCl = AgCl + NaNO3

Double displacement

Reactivity series

From most to least reactive: K, Na, Mg, Al, C, Zn, Fe, Pb, Cu, Ag, Au