Chemical Reactions

Chemical reactions

the breaking and rearranging of chemical bonds

Multiple Choice

How are ionic bonds formed?

• Transfer of electrons
• Sharing of electrons

Multiple Choice

How are covalent bonds formed?

• Sharing of electrons
• Transfer of electrons

Chemical reactions can

• change color

• produce a precipitate

• produce a gas

• exchange of heat

Chemical Equations

shorthand to express the chemical reaction

Reactants

the substance that undergoes the change in the reaction

The products

the resulting chemical compounds after the chemical reaction

Multiple Choice

the starting materials in a chemical reaction

• Products
• Reactants
• Starters
• Enders

Multiple Choice

the symbolic representation of a chemical reaction

• Long Hand
• Short Hand
• Electron Configuration
• Chemical Equation

Multiple Choice

a substance formed when two or more elements are chemically bonded together

• Element Soup
• Pure Element
• Ion
• Compound

Multiple Choice

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

• Product 
• Reactant
• Starters
• Enders

Multiple Choice

Provides evidence that a chemical reaction has occurred. 

• dissolving 
• melting
• formation of a gas
• bending

Types of Chemical Reactions

Synthesis

2 elements or compounds form another compound

Decomposition

A compound breaks to form 2 elements or more simple compounds

Multiple Choice

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

• combustion 
• synthesis 
• decomposition 
• single replacement 

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

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Multiple Choice

What is the left part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Multiple Choice

What is the type of chemical reaction?

2H_{2 +} O₂ --> 2H₂O

• synthesis

• decomposition

• Yields

• Chemical Equation

single replacement

a more reactive element replaces a less reactive element

Double replacement reaction

2 compounds break and form 2 new compounds

Combustion

oxygen reactant

products are carbon dioxide and water and heat

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

The chemical reaction Zn + H₂SO₄ --> ZnSO₄ + H₂ is a

• single displacement

• double displacement

• composition

• decomposition

Multiple Choice

The chemical reaction AgNO₃ + NaCl --> AgCl + NaNO₃ is a

• single displacement

• double displacement

• composition

• decomposition

Balancing Equations

reactant atoms=product atoms

Balancing Equations

only change coefficients not subscripts

Steps (fiddle with it)

• Write the equation

• write the number of reactant and product atoms

• each side of the equation has to contain the same number of atoms

• find the smallest coefficient possible

Multiple Choice

What are the larger numbers that you CAN CHANGE in a chemical equation? 

• Coefficient 
• Products
• Reactants
• Subscripts

Multiple Choice

What are the smaller numbers that you CANNOT change in a chemical equation? 

• Coefficient
• Products
• Reactants
• Subscript

Multiple Choice

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 
• Subscript
• Atom
• Equation

Multiple Choice

How many Oxygens are in this molecule? 
(OH)₂

• 4
• 1
• 2
• 3

Multiple Choice

What is the total number of atoms present in 5Na₃PO₄

• 5
• 40
• 55
• 8

Multiple Choice

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• No!

Multiple Choice

Is the following equation balanced?
2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

• yes
• no

Multiple Choice

Balance the following equation:

___ H₂+ ___ O₂→___ H₂O

• 1, 1, 3

• 2, 2, 2

• 1, 2, 1

• 2,1, 2