PS Ch. 7 Chemical Reactions Flashcard

Front

What is oxidation in chemical reactions?

Back

Oxidation refers to any reaction where electrons are lost.

Front

How many moles of hydrogen gas are needed for the reaction: 2H₂ + O₂ → 2H₂O?

Back

2 moles of hydrogen gas are needed.

Front

In a reaction energy graph, which portion represents the energy of the reactants?

Back

The energy of the reactants is shown in portion 1 of the graph.

Front

What is not part of the collision model for affecting reaction rates?

Back

Catalysts must be present to increase the reaction rate.

Front

Which of the following is not evidence of a chemical change?

Back

A change in size is not evidence of a chemical change.

Front

Define 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 law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings.