Chemistry Final Exam

Chemistry Final Review 6: Chemical Reactions

By William Lovering

Coefficients

This is the big number in front of a chemical formula. This number tells how many groups of that formula you have.

3 CO₂

The THREE in front of CO₂ is the coefficient.

Subscripts

The small number after the chemical formula. It only belongs to the element that it immediately follows and counts the amount of that element.

3 CO₂

The TWO after the chemical formula is the subscript.

Types of Chemical Reactions

Attempt writing the products for the first reaction

H₂SO₄ + BaCl₂ ----> ???

In double replacement reactions, elements trade places to form new products. Sometimes they form what is called a precipitate

HCl and BaSO4 are the products! But does it form a precipitate?

Using the solubility chart, does a precipitate form?

Your turn! Look at the following reaction and predict the precipitate

AgNO3 + KCl → AgCl + KNO3

H2SO4+BaCl2​→HCl+BaSO4
​
 

Precipitates are marked as (s) for solid. This shows that Silver Chloride (AgCl) is solid once the reaction takes place.

AgNO₃ (aq) + KCl (aq) → AgCl (s) + KNO₃(aq)

When compounds are soluble or dissolved in water, then they are aqueous (aq)

AgNO₃ (aq) + KCl (aq) → AgCl (s) + KNO₃(aq)

Multiple Choice

the starting materials in a chemical reaction

• Products
• Reactants
• Starters
• Enders

Multiple Choice

a substance that is formed as the result of a chemical reaction

• Product 
• Reactant
• Starters
• Enders

Multiple Choice

Which is the name of the kind of solid substance formed in this figure?  

• aqueous 
• precipitate
• acid
• synthesis 

Multiple Choice

An element plus additional element reacts to form one product is an example of which type of chemical reaction? 

• combustion
• decomposition 
• synthesis 
• single replacement

Multiple Choice

Which of the following compounds will not disassociate in water? 

• NaCl
• PbCl₂
• MgNO₃
• Na₂SO₄

Multiple Choice

What type of chemical reaction takes place when fluorine reacts with sodium bromide?

• single replacement 
• double replacement 
• combustion
• synthesis 

Multiple Choice

Which reaction between halogens and halide salts will occur?

• F₂(g)  +  FeI₂(aq) → FeF₂(aq)  +  I₂ (g)
• Cl₂(g) + SrF₂(aq)  → SrCl₂(aq)  +  F₂(g)  
• I₂(g)  + MgBr₂(aq)  → MnI₂(aq)  + Br₂(g)
• Br₂(l)  +  CoCl₂(aq) → CoBr₂(aq)  +  Cl₂(g)

Multiple Choice

Predict the following reaction 
NaCl   +   Ca(NO₃)₂ --> 

• no reaction both products are aqueous 
• Calcium chloride and sodium nitrate are produced  
• sodium nitrate is a solid formed 
• calcium chloride is the solid formed

Multiple Choice

A compound is reacted and forms two new substances. What type of reaction is this? 

• combustion 
• synthesis 
• decomposition 
• single replacement 

Multiple Choice

Describes the number of atoms in a compound of each element. 

• coefficient 
• superscript 
• subscript 
• SI unit 

Multiple Choice

What are the correct coefficients when this equation is balanced?
KClO₃  --> KCl  +  O₂

• 2,2,2
• 2,2,3
• 1,2,3
• 3,3,3

Multiple Choice

A metal is reacted with an acid to produce a salt and a hydrogen gas. What type of reaction has occurred? 

• neutralization 
• double replacement 
• single replacement 
• synthesis 

Multiple Choice

_AgNO₃ + _Cu →_Cu(NO₃)₂ + _Ag

• 2 AgNO₃ + 2 Cu → 3 Cu(NO₃)₂ + 1 Ag
• 2 AgNO₃ + 1 Cu → 1 Cu(NO₃)₂ + 2 Ag
• 1 AgNO₃ + 2 Cu → 2 Cu(NO₃)₂ + 1 Ag
• 3 AgNO₃ + 2 Cu → 3 Cu(NO₃)₂ + 2 Ag

Multiple Choice

How many Al atoms are in this compound? 4Al₂O₃

• 2

• 8

• 6

• 4

Multiple Choice

What is the formula for sodium bromide?

• NaBr

• NaBr₂

• Na₂Br

• SoBr

Multiple Choice

What is the formula for diphosphorus pentoxide?

• P₂O₅

• PO₅

• P₅O₂

• Po₂O₅

Multiple Choice

What is the chemical formula of sulfur hexabromide?

• SBr₆

• S₆Br

• S(VI)Br

• SBr₄

Multiple Choice

What is the name of the compound with the formula Ba₃P₂?

• barium phosphide

• barium diphosphide

• tribarium diphosphide

• barium phosphorous

Multiple Choice

What is the formula for magnesium chloride?

• MgCl
• Mg₂Cl
• MgCl₂
• Mg(ClO₃)₂

Multiple Choice

What is the chemical formula for an ionic compound of potassium and oxygen?

• KO

• K₂O

• K₂O₂

• KO₂

Multiple Choice

What is the name of Cu₃N₂?

• copper (III) nitride

• copper (II) nitride

• copper nitride

• tricopper dinitride

Multiple Choice

What's the formula for iron (II) nitride?

• Fe₃N₂

• Fe₂N₃

• Fe₂NO₂

• FeN

Multiple Choice

What is the formula for mercury (I) oxide?

• HgO

• Hg₂O

• HgO₂

• Hg₂O₂

Multiple Choice

What is the name of P₄S₁₀?

• phosphorous sulfide

• phosphorus sulfite

• tetraphosphorus decasulfide

• tetraphosphide decasulfide

Multiple Choice

What is the correct name for the compound with the formula (NH₄)₃PO₄

• Ammonium Pyrophosphite

• Ammonium Phoporylate

• Ammonium Phosphite

• Ammonium Phosphate

Multiple Choice

What is the correct formula for aluminum nitrate

• Al₂(NO₃)₃

• Al(NO₃)₃

• Al(NO₃)₂

• Al₂(NO₃)₄