Chemical Reactions
In an exothermic reaction, is energy released or absorbed?
released
A ___________________ is a mixture of two or more substances that are uniform at molecular level
solution
If something has a pH less than 7, it is a
acid
This describes the speed at which reactants are converted into products.
reaction rate
Name one way to increase the reaction rate of a chemical reaction.
answers will vary
1. increase molecule collision (adding heat & increasing concentration)
2. add catalyst
In an endothermic reaction, is there an increase or decrease in temperature?
decrease
The substance being dissolved in a solution is a called the
solute
If something has a pH more than 7, it is a
base
This substance speeds up a chemical reaction.
catalyst
What role does energy play in chemical reactions?
They break bonds.
The dissolving medium in a solution is called the
solvent
If something has a pH equal to 7, it is
water
or
neutral
During a chemical reaction, 10 g of product is made. The maximum calculated yield is 11 g. What is the percent yield of this reaction?
90%-91%
What is needed to begin a chemical reaction?
activation energy
In a ______________, the particles are large, do not dissolve, and will separate.
suspension
Give one property of acids.
create the sour taste in food, like lemons.
can be very corrosive
Water is a polar molecule because ....
1. has an unequal sharing of electrons
2. tetrahedron shape
In a chemical reaction, this is used up first and affects the amount of product formed.
limiting reactant
Give an example of a suspension.
answers will vary
Give one property of a base
bitter taste
have a slippery feel, like soap
doesn’t react with metals
Do catalysts increase the activation energy or lower the activation energy in a chemical reaction?
lower the activation energy