Review Unit 5 Chemical Reactions

Front

What is a combustion reaction?

Back

A combustion reaction is a chemical reaction that typically involves the reaction of a substance with oxygen, resulting in the release of heat and light.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is the oxidation number of hydrogen in H2O?

Back

The oxidation number of hydrogen in H2O is +1.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides of the equation.

Front

What is the oxidation number of carbon in CH4?

Back

The oxidation number of carbon in CH4 is -4.

Front

What is a decomposition reaction?

Back

A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is an example of a gas formation in a chemical reaction?

Back

An example of gas formation is the reaction of baking soda (sodium bicarbonate) with vinegar (acetic acid), which produces carbon dioxide gas.

Front

What is the significance of heat release in combustion reactions?

Back

The release of heat in combustion reactions is significant because it indicates that the reaction is exothermic, providing energy that can be harnessed for various applications.

Front

What is the role of oxygen in combustion reactions?

Back

Oxygen acts as a reactant in combustion reactions, allowing the fuel to oxidize and release energy in the form of heat and light.