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Chemical Reactions

8th Grade Describing and Controlling Chemical Reactions

What is a chemical equation? A short easy way to show a chemical equation
If a molecule of carbon dioxide is involved in a chemical reaction, how is it represented in the chemical equation for the reaction? CO2
The substance you have at the beginning of a chemical reaction are called the ... Reactant
The substance you have when a chemical reaction is complete are called the ... Products
What do you read the arrow in a chemical equation as meaning? Yeild
At the end of a chemical reaction, what is the total mass of the reactants compared to the total massof the products? All of the reactants mass added together gives you the products mass.
What is the principle called the conservation of mass? During a chemical reaction, matter is not created or destroyed. All atoms present at the beginning of the reaction are there in the end.
Describe and open system. An open system is where matter can enter or escape, there for the mass won't be the same.
What is an example of a closed system? A pear is sealed in a container and it decays over time.
When is a chemical equation balenced? A chemical equation is balenced when all atoms are equal.
A number placed in front of a chemical formula in a chemical equationos called a ... Coeffiecent
What does a coefficient tell you? How many atoms of an element there are in a reaction.
In what 3 catagories can chemical reactions be classified? Synthesis, Decomposition, Replacement
Which catagory of chemical reactions comes froma term that means "to put things together?" Synthesis
The ... is the minimum amount of energy needed to start a chemical reaction. Activation energy
In a reaction that makes water from hydrogen gas and oxygen gas, where does the activation energy come from? Have to have a spark or heat
A reaction that releases energy is ... exothermic
A reaction that absorbs energy is ... endothermic
Why does an exothermic reaction need activation energy? It needs it to start the reaction
What are five factors that affect the rate of a chemical reaction? Surface area, tempature, concentration, catalyst, inhabitors
Why does surface area of a reactant influence the rate of the reaction? IF you have a bigger surface area then there will be more particles to react.
In what way is temperature related to chemical reaction rates? The higher the temperture the faster the reaction. The lower the temperature the slower the reaction.
The amount of substance in a given volume is called ... Concentration
To increase the rate of a reaction, why would you increase the concentration of the reactants? You would increase it because there would be more paticles to react.
What is a catlyst? A material that increases the rate of a reaction by lowering the activation energy.
A biological catalyst is a ... enzyme
Why must living things rely on thousands of catalyst for chemical reactions necessary for life? They break down food.
What is an inhibitor? A material used to decrease the rate of a reaction.
How do most inhibitors work? They prevent reactants fcrom comeing together
Created by: Music1741