Chemical Reactions Flashcard Review

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during the reaction.

Front

What does it mean if a reaction is endothermic?

Back

An endothermic reaction absorbs heat from its surroundings, resulting in a decrease in temperature of the surroundings.

Front

What does it mean if a reaction is exothermic?

Back

An exothermic reaction releases heat to its surroundings, resulting in an increase in temperature of the surroundings.

Front

How do you determine if a chemical equation is balanced?

Back

Count the number of atoms of each element on both sides of the equation; if they are equal, the equation is balanced.

Front

What is the significance of the coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of each reactant and product involved in the reaction.

Front

What happens to the temperature of the surroundings during an endothermic reaction?

Back

The temperature of the surroundings decreases because heat is absorbed by the reaction.

Front

What happens to the temperature of the surroundings during an exothermic reaction?

Back

The temperature of the surroundings increases because heat is released by the reaction.

Front

How many hydrogen atoms are in the formula 3C2H6?

Back

There are 18 hydrogen atoms (3 x 6 = 18) in the formula 3C2H6.

Front

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

Back

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

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction; it can only change forms.