Chemistry - Module 6

Choose the reactions that are NOT double-replacement reactions.

- NH4Cl+ KOH --> KCl + NH3 + H2O - Zn + Cu (CH3COO)2 --> Zn(CH3COO)2 + Cu

Which of the following factors can impact reaction rates: (Choose all the apply)

- Presence of a catalyst - Temperature of reactants - Concentration of reactants - Surface area of the reactants

When the equation below is balanced using the smallest whole number coefficients, the coefficient of the O2 is ____. ____H2 + _____O2 --> _____ H2O

1

Please define the following three reactions, providing at least 1-2 sentences for each. Combustion Reaction Decomposition Reaction Synthesis Reaction

1. A combustion reaction involves oxygen gas and oftentimes produces water and carbon dioxide. They release energy as a product in the form of heat or light. 2. A decomposition reaction involves a compound splitting apart in two simpler substances. Energy from either heat, electricity, or light must be supplied to the reaction. 2. A synthesis reaction involves small, simple substances to form together into a larger substance.

Identify the balanced decomposition reaction for silver oxide:

2 Ag2O (s) --->4 Ag (s) + O2 (g)

Identify the spectator ion(s) in the ionic equation below. 2K+ (aq) +CO32- (aq)+Ba2+ (aq)+2NO3- (aq)→2K+ (aq) +2NO3- (aq)+BaCO3 (s)

2K+; 2NO3 -

Which of the equations is the reverse reaction of N2(g) + 3 H2(g) --> 2NH3 (g)

2NH3(g) → N2(g) + 3H2(g)

Which of the following is the balanced double replacement reaction that occurs when aqueous sodium hydroxide reacts with aqueous strontium chloride, producing a precipitate of strontium hydroxide?

2NaOH (aq) + SrCl2 (aq) --> 2NaCl (aq) + Sr(OH)2 (s)

Which of the following is the balanced double replacement reaction that occurs when an aqueous solution of copper(II) nitrate combines with an aqueous potassium phosphate?

3Cu(NO3)2(aq) + 2K3PO4(aq) --> Cu3(PO4)2(s) +6KNO3 (aq)

What is the net ionic equation that occurs when zinc nitrate and lithium phosphate are mixed together in water? A precipitate of zinc phosphate is formed.

3Zn2+ + 2PO43- → Zn3(PO4)2 (s)

When the equation below is balanced using the smallest whole number coefficients, what is the coefficient in front of Cr? _____Cr + _____ O2 --> ______Cr2O3

4

Which of the following is the balanced synthesis equation if copper has a charge of +1?

4Cu + O2 → 2Cu2O

How many Hydrogen atoms are below? 3H20

6

Two reactants are separated by a _____.

A plus sign

What does dynamic equilibrium mean?

A state where no net change is taking place, despite the fact that both reactions are still occurring

Identify the reaction that is NOT a decomposition reaction?

Al (s) + HCL (aq) -->AlCl3 (ag) + H2 (g)

Which statement about the solubility rules is NOT true?

All acetate compounds are soluble.

Which of the following is a synthesis reaction?

All of the answers are correct. (Two elements combining to form a compound, The reaction of an element with oxygen to form an oxide, and Two compounds combining to form another more complex compound)

Which symbol separates the reactants from the products?

An arrow

What is a diatomic element?

An element that comes in pairs such as Cl2 , N2 , O2

Increasing concentration means an increase in the reaction because of ______________________

An increase in the frequency of collisions between reactant molecules

The least reactive metals are found _____ of the activity series, while the most reactive metals are found _____.

At the bottom; at the top

Increasing the temperature:

Both are true

Select the reaction that is NOT a synthesis reaction?

CH4 + O2 --> CO2 + H2O

Write a skeleton equation for this reaction. A piece of calcium metal is placed into a solution of copper (II) nitrate. A reaction occurs, forming calcium nitrate and copper metal.

Ca (s) + Cu(NO3)2 (aq) ==> Ca(NO3)2 (aq) + Cu (s)

Write a skeleton equation for this reaction. When calcium carbonate is heated, it decomposes into calcium oxide and carbon dioxide gas.

CaCo3 (s) --> CaO (s) + CO2 (g)

Which of the equations represents a reversible reaction? Hint: Remember the delta symbol (triangle) under the arrow means heat is added

CaO(s) + CO2 == CaCO3(g)

When a hydrocarbon undergoes combustion, what are the products?

Carbon dioxide and water

State whether each reaction listed below is a synthesis, decomposition, combustion, single or double replacement reaction. C4H10(g) + O2(g) --> CO2 + H2O (l)

Combustion

Which is the correct dissociation equation for cesium bromide?

CsBr(s)-->Cs+(aq) + Br-(aq)

What type of equation is seen below: Energy + nitrogen + oxygen --> nitrogen monoxide

Endothermic reaction

Which of the following is the best description of the energy in a chemical reaction?

Energy may be either absorbed or released during a reaction.

What type of reaction is identified by the pattern below? CH4 + O2 --> CO2 +H2O + Energy

Exothermic reaction

Identify the balanced equation?

Fe(NO3) 2 + 2KF --> FeF2 + 2K(NO3)

What do we call a reaction that goes to completion?

Irreversible reaction

Which ions are present in a solution of potassium nitrate, KNO3?

K+, NO3−

Which combination below will NOT result in a chemical reaction?

K2SO4 (aq) + NH4Cl (aq) →

Antoine Lavoisier developed which of the following laws:

Law of Conservation of Mass

In at least 2-3 sentences, explain Le Châtelier's Principle regarding equilibrium and provide an example of "stress".

Le Châtelier's Principle regarding equilibrium states that the equilibrium will shift in the direction that counteracts the stress when it is added to the system. An example of "stress" include a change in volume, pressure, temperature, or concentration.

Which ions are present in a solution of lithium hydroxide, LiOH

Li+, OH−

What are the three general types of single-replacement reactions? (Select all that apply)

Metal, Hydrogen, Halogen

Which equation is balanced?

Mg + 2HCl → MgCl2 + H2

Write a skeleton equation for this reaction. A piece of magnesium metal is placed into a solution of copper (II) nitrate. A reaction occurs, forming magnesium nitrate and copper metal.

Mg(s) + Cu(NO3)2 (aq) ---> Cu(s) + Mg(NO3)2 (aq)

Identify the product of a synthesis reaction between magnesium metal and nitrogen gas?

Mg3N2

Nitrogen gas reacts with hydrogen gas to form ammonia, a common cleaning liquid when diluted with water. Which equation is correct for this reaction?

N2 + 3H2 → 2NH3

Identify the reaction that is NOT a combustion reaction:

NO(g) +O3(g) --> NO2 (g) + O2 (g)

Which of these is NOT required for equilibrium?

NOT Reaction occurs at a constant temperature

Choose the correct formula for reaction rate.

NOT distance / time

If reaction A occurs quickly at room temperature and reaction B will not occur unless heated to 500°C, which statement is true?

Reaction B has a higher activation energy than reaction A.

What is a reaction where the forward and reverse reactions occur at the same time?

Reversible Reaction

State whether each reaction listed below is a synthesis, decomposition, combustion, single or double replacement reaction. Cu(s) + AgNO3 (aq) --> Cu (NO3)2 (aq) + Aq (s)

Single Replacement

Which of the following is the balanced single replacement reaction that occurs when tin reacts with hydrochloric acid?

Sn(s) + 2HCl (aq) --> SnCl2 (aq) + H2(g)

Select the balanced equation for the decomposition of strontium hydroxide.

Sr(OH)2 → SrO + H2O

State whether each reaction listed below is a synthesis, decomposition, combustion, single or double replacement reaction. Fe(s) + Br2 (g) --> FeBr3 (s)

Synthesis

If a reaction has a low activation energy, what is true about the rate of reaction?

The rate of reaction will decrease as the temperature is increased.

Which of the following describes what occurs when a system is in balance between the forward and reverse reactions?

When the rate of the forward reaction is equal to the rate of the reverse reaction

Which is NOT a single-replacement reaction?

Zn(NO3)2 + NaOH --> NaNO3 + Zn(OH)2

What is the best description of the symbol NaCl (aq)

a solution of sodium chloride dissolved in water.

What is the highlighted 3 in this portion of a chemical reaction called? 3H2O

coefficient

What is changed to balance equations?

coefficients

As the concentration of a reactant decreases, the rate of reaction ________.

decreases

Oxygen is what type of molecule?

diatomic

A catalyst used in your body is called a(n) ______.

enzyme

Use the potential energy diagram to answer the question. Is the reaction endothermic or exothermic? (starts at 55 going straight, goes uphill to 95, then decreases to 20.)

exothermic reaction

What type of reaction is identified by the pattern below? Reactants --> Products + Energy

exothermic reaction

Which molecules are diatomic? (Choose all that apply)

hydrogen, bromine, nitrogen

As the number of effective collisions increases, the rate of reaction _____.

increases

If two reactant particles collide, but a reaction does not occur, this is called a(n) _____.

ineffective collision

A precipitate is defined as a (n) _____________

insoluble ionic compound

When a binary compound decomposes what are the products?

its component elements

In a chemical reaction lithium metal is placed in water, and lithium hydroxide is produced along with hydrogen gas. What are the reactants?

lithium and H2O

In a chemical reaction lithium metal is placed in water, and lithium hydroxide is produced along with hydrogen gas. What are the products?

lithium hydroxide and hydrogen gas

All net ionic equations must be balanced by both _____ and _____.

mass and charge

Choose the metal that can displace hydrogen in an acid

nickle

Compounds containing which polyatomic anion are all soluble?

nitrate

A solid that forms when two or more aqueous solutions are mixed is called a _____.

precipitate

The solid silver chloride formed when solutions of NaCl and AgNO3 are mixed is called a _____.

precipitate

What are the compounds or elements on the right side of a chemical reaction?

products

What are the compounds or elements on the left side of a reaction called?

reactants

In a chemical reaction sodium metal is placed in water, and sodium hydroxide is produced along with hydrogen gas. What are the products?

sodium hydroxide and hydrogen gas

A precipitate is what state of matter?

solid

A species that is dissolved in a solution, but does not take part in the chemical reaction is a(n)...

spectator ion

The 2 in the portion of a chemical reaction below is called a(n) 3H20

subscript

The symbol (s) tells us ______.

the physical state of the substance

Which change is NOT a chemical reaction?

water seeping through a pot of soil

What is the name of this type of equation? Sodium and water are combined to produce sodium hydroxide and hydrogen

word equation

What does the arrow in a chemical reaction mean?

yields

In a chemical reaction, zinc metal is placed into a solution of hydrochloric acid, and zinc chloride is produced along with hydrogen gas. What are the reactants?

zinc and hydrochloric acid

In a chemical reaction, zinc metal is placed into a solution of hydrochloric acid, and zinc chloride is produced along with hydrogen gas. What are the products?

zinc chloride and hydrogen gas