Chemical Reactions

Front

What are the products of the combustion of hydrocarbons?

Back

The products are typically carbon dioxide (CO2) and water (H2O).

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What are the reactants in a combustion reaction involving carbon?

Back

The reactants are molecular oxygen (O2) and carbon (C) or hydrocarbons.

Front

What does it mean when a chemical reaction is endothermic?

Back

An endothermic reaction is one that absorbs heat from its surroundings, resulting in a decrease in temperature.

Front

What are some signs of a chemical change?

Back

Signs of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

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; it is conserved.

Front

What is the difference between an exothermic and an endothermic reaction?

Back

An exothermic reaction releases heat to the surroundings, while an endothermic reaction absorbs heat.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is a catalyst?

Back

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.

Front

What is the role of activation energy in a chemical reaction?

Back

Activation energy is the minimum energy required for a chemical reaction to occur.