Unit 2 Lesson 6: Chemical Reactions Flashcards
What is rusting?
Rusting is a chemical reaction that occurs between iron and oxygen in the presence of water.
What is the exact defintion of a chemical reaction?
a process in which the chemical arrangement of a substance changes
What happens during a chemical reaction?
During a chemical reaction, a new substance forms from the reacting substances. Bonds between atoms break and atoms are rearranged to form new substances.
What happens during rusting?
During rusting, iron and oxygen elements combine to form iron oxide, which is commonly known as rust.
What is a chemical equation?
A chemical equation is a model of a chemical reaction. It shows the reacting chemicals and the chemicals that form during a reaction. The arrow in a chemical equation means “yields.”
What are reactants?
Reactants are substances that enter a chemical equation.
What are products?
The substances that form during the chemical reaction are called the products.
What are the inputs and outputs of a chemical equation?
The reactants are the inputs and the products are the outputs.
What is the chemical equation for rust?
iron + oxygen → iron oxide
What is the balanced chemical equation?
4Fe + 3O2 → 2Fe2O3
What does the word exothermic mean using terminology?
The word part exo means “out” so, during an exothermic reaction, more energy is released into the environment than is absorbed.
Is cellular resipiation a exothermic reaction if so explain why
Cellular respiration is an exothermic reaction. The body uses some energy during cellular respiration, but a lot more energy is produced in the form of ATP.
What is the exact defintion of an exothermic reacion?
occurs when more energy is released by the substance than is absorbed by the substance
When does an exothermic reaction occur?
Breaking bonds and forming new bonds requires a change in energy. If the energy required to break the bonds is greater than the energy required to form new bonds, an exothermic reaction occurs.
What is the chemical equation for cellular respiration?
glucose+oxygen→carbon dioxide+water+energy=(ATP)
Give an example of a endothermic reaction?
When the substances inside a cold pack mix and bind together more energy is absorbed than is released. This causes a drop in temperature in the surrounding environment.
What is a endothermic reaction?
An endothermic reaction occurs when more energy is absorbed by the substance than is released into the environment. The word part endo means “inward.”
What is the chemical equation for photosynthesis?
carbon dioxide+water+light energy→glucose+oxygen
How much energy does exothermic reacions need?
Exothermic reactions need a small amount of energy to activate the reaction but a lot more energy is released in the process.
What is activation energy?
Activation energy is the minimum amount of energy the reactants need for a chemical reaction to occur.
How much energy does an endothermic reaction need?
During an endothermic reaction the products are at a higher energy state than the reactants.
How much energy does activation energy need
Therefore, the activation energy needs to be high for the reaction to occur.
What happens to the energy during a chemical reaction?
The total amount of energy gained or lost during reaction is equal to the difference in energy between the reactants and the products.
The light and colors produced by fireworks are the result of chemical reactions. Do you think the reactions that produce these lights are exothermic or endothermic? Explain your reasoning.
They are exothermic because light and heat are released during the reaction.
The student wants to determine whether an exothermic or endothermic process occurs when a salt is mixed into water. Explain a process the student could use to determine whether an exothermic or an endothermic process takes place.
Answer
The student could use a thermometer to measure whether there is a temperature change when the salt mixes into the water. If the temperature increases, it is an exothermic process. If the temperature decreases, it is an endothermic process.
What do enzymes do?
human body has enzymes which are specialized proteins that catalyze or speed up chemical reactions.
What can changes to enviroment do to enzymes?
Changes to the environment can denature enzymes. A denatured enzyme can no longer perform its function.
What do enzymes do to the bonds between the reactants?
Like most catalysts, enzymes weaken the bonds between the reactants which lower the activation energy of a chemical reaction.
