Chemical Reactions

Chemical Reactions

Balancing

Multiple Choice

Which of the following is a neutralization reaction?

• 2Na + Cl₂ → 2NaCl

• CH₄ + 2O₂ → CO₂ + 2H₂O

• HCl + KOH → KCl + H₂O

• CaCO₃ → CO₂ + CaO

Multiple Choice

The numbers needed to balance the equation are:

• 2, 7, 6, 4

• 2, 1, 1, 2

• 3, 1, 1, 3

• 1, 6, 2, 6

Multiple Choice

The numbers needed to balance the equation are:

• 2, 7, 6, 4

• 2, 1, 3, 2

• 1, 1, 3, 2

• 2, 3, 1, 3

Multiple Choice

How many Mn atoms are found in the following compound?

3Cr(MnO₄)₆

• 3

• 4

• 6

• 18

Multiple Choice

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.

• Matter can only be lost in a chemical reaction.

• Matter can only be gained in a chemical reaction.

• Matter can be gained and lost in a chemical reaction.

Multiple Choice

What is the right part of a chemical equation called...

2H_{2 +} O₂ --> 2H₂O

• Reactants

• Products

• Yields

• Chemical Equation

Multiple Choice

How many HCl molecules do you need to balance this equation?

Mg + __HCl ---> MgCl₂ + H₂

• 1

• 2

• 3

• 4

Multiple Choice

Element or compound?

H₂O

• element

• compound

Multiple Choice

Balance the following equation:

___ SeCl₆+ ___ O₂→___ SeO_{2+____}Cl₂

• 1, 1, 1, 3

• 2, 1, 2, 1

• 1, 2, 1, 2

• 2, 2, 2, 4

Multiple Choice

What is the coefficient? 3H₂O

• 6

• 5

• 2

• 3

Multiple Choice

Balance the the following equation.

__Zn+__HCl -->__ZnCl₂ +__H₂

• 1,1,2,1

• 1,1,1,2

• 1,2,1,1

• 2,1,1,1

Multiple Choice

What are the coefficients that would properly balance this equation?

__AgNO₃ + __H₂S --> __Ag₂S+ __HNO₃

• 2,1 --> 1,2

• 1,2 --> 1,1

• 1,2 --> 1,2

• 1,2 --> 2,1

Multiple Choice

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe₂O₃--> __Fe + __CO₂

• 3,1 --> 2,3

• 3,2 --> 1,1

• 3,2 --> 2,4

• 3,2 --> 2,1

Multiple Choice

Balance this equation

_Al +_HCl --> _H₂ +_AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Multiple Choice

What law governs the balancing of chemical equations?

• Law of Energy

• Law of Conservation of Matter/Mass

• Law of Gravity

• Law of Matter Movement

Multiple Choice

What is the total number of atoms present in 5Na₃PO₄

• 5

• 40

• 55

• 8

Multiple Choice

Which equation is balanced?

• PbO₂ + 2H₂

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

Multiple Choice

What coefficient should be used to make the following equation balanced?

N₂+O₂--> _NO

• 1

• 2

• 3

• 4

Multiple Choice

Which problem is balanced?
(Check ALL answers)

• PbO₂ + 2H₂
• SO₂ + H₂0 --> H₂SO₄
• 2Na + 2H₂O --> 2NaOH + H₂

Multiple Choice

What is the little number after an element in a chemical equation called.

Example: H₂

• Coefficient

• Subscript

• Atom

• Equation

Multiple Choice

Balance this equation:

H₂ + Cl₂ ---> HCl

• It is balanced.

• H₂ + Cl₂ ---> 2HCl

• 3H₂ + Cl₂ ---> 6HCl

• H₂ + 3Cl₂ ---> 6HCl

Multiple Choice

Which of the following equations are correctly balanced?

• 12CO₂ + H₂O ---> C₆H₁₂O₆ + O₂

• CO₂ + H₂O ---> 3C₆H₁₂O₆ + O₂

• CO₂ + 9H₂O ---> C₆H₁₂O₆ + O₂

• 6CO₂ + 6H₂O ---> C₆H₁₂O₆ + 6O₂

Multiple Choice

What is the part of the chemical equation in green called?

Fe + S --> FeS

• products

• reactants

• yield

• chemical formula

Multiple Choice

What is a coefficient?

• The small number on the right of the chemical symbol.

• The large number in front of a chemical formula.

• The number in between the chemical symbols.

• The number behind a chemical formula.

Multiple Choice

What is the Law of Conservation of Mass?

• It states that matter cannot be created or destroyed.

• It states that energy cannot be created or destroyed.

• It states that matter can be created or destroyed.

• It states that sound can be created or destroyed.

Multiple Choice

The number of atoms of oxygen in 
Cu(NO₃)₂ is ...

• 2
• 5
• 6
• zero 

Multiple Choice

A metal like copper is said to be ductile. This means it can be ...

• corroded easily

• bent into wires

• heat up and conduct heat

• bent into sheets

Multiple Choice

The toxicity of a substance refers to ..

• its ability to burn ie catch on fire

• its ability to react quickly with other substances

• how its affects your health

• its ability to explode

Multiple Choice

Chemical properties of a substance include all of the following except..

• its boiling point 
• its toxicity 
• its flammability 
• its reactivity 

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

Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?

• double replacement

• decomposition

• combustion

• single replacement

Multiple Choice

Describes the number of molecules in a compound and is used to balance a chemical reaction.

• coefficient

• subscript

• superscript

• SI unit

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

tells us the number of atoms of each element in a compound

• Coeffecient

• Exponent

• Chemical Formula

• Calculator

Multiple Choice

bond in which one or more electrons from one atom are removed and attached to another atom, resulting in positive and negative ions which attract each other

• Covalent Bond
• Ionic Bond
• Reaction Bond
• Null Bond