Chemical reactions

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

• Product

• Reactant

• Starters

• Enders

Which of the following is an example of a chemical change?

• water freezes to form ice

• sugar dissolves in water

• gasoline burns in a car engine

• a piece of metal expands when it is heated

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

• Reactants
• Products 
• Yields 
• Chemical Equation 

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

• Reactants
• Products 
• Yields 
• Chemical Equation 

Which of the following reactions is balanced?

• 2CH₄ + O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + 2H₂O
• None of the chemical equations are balanced.

Which one shows that a chemical reaction has occurred?

• dissolving

• melting

• formation of a gas

• bending

True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.

• True

• False

Look at the chemical equation.

Is it written correctly to show the Law of Conservation of Mass?

• Yes

• No

Look at the chemical equation.

Is it written correctly to show the Law of Conservation of Mass?

• Yes

• No

According to the law of conservation of mass, how does the amount of each element on the product side compare to each element on the reactant side?

• The amount of atoms on each side is equal

• The amount of atoms on the product side is greater

• The amount of atoms on the reactant side is greater

• Depends on the reaction