What is a Chemical Reaction?
True or False: New product(s) are formed in a chemical reaction
True
If you reduce the amount of reactants, will the amount of products increase or decrease?
The amount of product will decrease.
What is a precipitate?
A precipitate is an insoluble solid that forms when two solutions are combined and react chemically.
If there are two sets of reactants, a hot set and a cold set, which will produce the quicker reaction?
The warmer set of reactants will produce the quicker reaction.
What are the two types of energy changes names in a chemical reaction?
Endothermic and exothermic reactions.
The two substances that react to make a chemical reaction
What are reactants
If you are trying to make more product, what will you do to the reactants?
You will add more reactants.
What does insoluble mean?
Insoluble means a solid that will not dissolve.
What is a catalyst?
A catalyst is a substance that speeds up a chemical reaction, but is not consumed by the reaction.
In an endothermic reaction, does the temperature increase or decrease?
The temperature in an endothermic reaction decreases.
What happens if you run out of one of the reactants in a chemical reaction?
The reaction will stop because there is nothing for the other reactant to react with.
If you put a lid over a candle so no more oxygen can get through, what will happen to the fire in the candle?
The fire will go out because one of the reactants, oxygen, has run out so the other reactant has nothing to react with to make the product.
Can you have a precipitate that is a liquid or a gas?
No, because precipitates are only insoluble solids.
If you want your chemical reaction to occur faster, will you want your reactants hot or cold?
You will want them hot.
If during a chemical reaction, the product heats up, is this an endothermic or exothermic reaction?
This is an exothermic reaction.
Is this an example of conservation of mass?:
CH4 + 2O2 = CO2 + 2H2O
Yes
If you have seven total reactant atoms, how many product atoms will you have?
You will have seven product atoms.
Is salt a precipitate?
No, because salt dissolves in water.
What does it look like on the molecular level when a reactant is hot?
The atoms of a hot reactant are moving around more and faster than the atoms of a cooler reactant.
When more energy is used to break apart bonds, what does this tell me about the energy released?
There will be less energy released
What is the law of conservation?
When no new atoms are created and no atoms are destroyed.
If you keep adding to one of the reactants in a chemical reaction but not the other, what will happen?
The one that is not being added to will eventually run out and there will not be a chemical reaction anymore because there is not any reactant to react with.
How do you test if the substance that was produced in a chemical reaction is a precipitate or not?
You take the solid out of the two liquids using a filter. After you filter out the solid, you mix it with a liquid like water and see if it will dissolve.
If you add yeast to hydrogen peroxide, how do you know that the yeast is the catalyst?
You know it is the catalyst because it speeds up the decomposing process of the hydrogen peroxide. The bubbles form faster when the yeast is added.
Besides the heat produced, what is another way you know that the hot hands is an example of an exothermic reaction?
The hot hands takes a while to heat up. This tells me that less energy is used to break apart bonds making the reaction occur slower.