Chemical Equations and Endo/Exo Reactions Study Guide

These flashcards cover key concepts from chemical equations, the Law of Conservation of Mass, and definitions of endothermic and exothermic reactions.

What are reactants in a chemical equation?

Substances that undergo a chemical change in a reaction.

What are products in a chemical equation?

Substances formed as a result of a chemical reaction.

What does the arrow (yields) represent in a chemical equation?

It indicates the direction of the reaction, separating reactants from products.

What is the Law of Conservation of Mass?

Mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

In the equation 2KClO3 -> 2KCl + 3O2, how many grams of O2 are produced if 500 grams of KClO3 decomposes yielding 303 grams of KCl?

197 grams of O2 are produced.

How many grams of oxygen are needed to react with 350 grams of iron to produce 500 grams of FeO3 based on the equation 4Fe + 3O2 -> 2FeO3?

525 grams of O2 are needed.

What is an endothermic reaction?

A chemical reaction that absorbs heat from its surroundings.

What is an example of an endothermic reaction?

Photosynthesis is an example of an endothermic reaction.

What is an exothermic reaction?

A chemical reaction that releases heat to its surroundings.

What is an example of an exothermic reaction?

Combustion of fuels is an example of an exothermic reaction.

Which reaction from the study guide is endothermic?

Photosynthesis can be an example of an endothermic reaction.

Which reaction from the study guide is exothermic?

Combustion of methane (CH4) is an exothermic reaction.

What happens to the temperature of both reactions if left alone for 24 hours?

The temperature will stabilize and remain constant if no energy is added or removed.

What is the temperature change in Reaction 2?

To determine the temperature change, calculate using the specific heat formula.