Science - Chemical Reactions
What is a catalyst?
A catalyst is neither a reactant nor product since it is not consumed or produced in a chemical reaction. It is used to affect the rate of a reaction.
Why do some reactions happen quickly while others take time?
Because it might take longer for the complete consumption of some reactants.
What are three signs of a chemical reaction?
Color change, temperature change and, formation of gas.
What are reactants?
Elements or compounds that enter into a chemical reaction. The reactants make up the products.
True or False: Not all chemical reactions can be written as equations.
False
What happens when you increase or decrease the catalyst?
Increasing or decreasing the amount of a catalyst will change the rate of a reaction.
Are reactants always completely used up in a chemical reaction?
No, the reactants aren't always used up in a chemical reaction.
What happens if there is more of reactant A than reactant B? What is the limiting reactant?
Reactant B is completely consumed, while a portion of reactant A remaining reactant. Reactant B is the limiting reactant because not all of it is bonding with reactant A.
What happens to reacting chemicals in a chemical reaction?
Reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
What does the arrow mean? (Reactant + Reactant ----> Product)
The arrow represents an equals sign.
What are products?
The elements or compounds produced by a chemical reaction.
Explain the law of conservation of matter.
The law of conservation of matter states that matter cannot be created or destroyed, but changed only in form.
How does the Law of Conservation of Matter relate to chemical reactions?
The mass of the products in a chemical reaction must equal the mass of the reactants. We can change or alter chemicals but we cannot destroy them. We also cannot create them.
What happens when all reactants are consumed in a chemical reaction?
They no longer exist in their original form.
True or False? Mg + 2 HCI ---> MgCI2 + H2
True
In a chemical reaction, do the amounts of the reactants affect the amounts of the products produced? Explain.
Yes. The greater the amount of reactants, the greater the chemical reaction or products produced.
How do you measure the chemical reactions?
You can measure color with the spectrophotometer which measure the light waves that traveled through the chemical. We measured temperature with a thermometer, and gas formation with the balloon expanding.
