Physical and Chemical Changes
Law of Conservation
PH Scale
Opened and Closed Systems / Rate of Reaction
Random
100
Which is an example of one physical change and one chemical change
a. boiling water and melting wax
b. freezing water and burning wood
c. rusty nail and baking cookies
b. freezing water and burning wood
100
do the reactants come before or after
Reactants are before and products are after
100
What has a PH of 5
black coffee
100
Is this an open or closed system?
open
100
What number is missing?
1, 1, 2, 3, 5, 8, 13, ___, 34
21
200
Which of the following is NOT a sign of a chemical change?
a. the release of a new gas
b. the change of a liquid to a solid due to freezing
c. the release of heat energy
b. changing of a liquid to a solid
200
Does this follow the law of conservation? Why or why not.
Yes this follows the law of conservation because the reactants have the same number of atoms as the products
200
what is a substance with a Ph of 6 considers
a. acid
b. neutral
c. base
a. acid
200
4 chemicals are added to a test tube have a chemical reaction. If the container was closed and no matter could escape, how would the final mass of the contents of the test tube be compared to the starting mass?
they would be the same
200
what is the most played videogame of all time?
Fortnite
300
What is one example of a physical change and one example of a chemical change?
answers may vary
300
Does this follow the Law of conservation
Yes because the reactants have the same number of atoms as the products
300
What is an example of something that would have an ACID ph
answers may vary
300
A chemical reaction between two substances is conducted in a bottle without a cover. During the chemical reaction the temperature of the flask is observed to decrease. Which of the below best describes this experiment?
An exothermic reaction in an open system
An exothermic reaction in a closed system
An endothermic reaction in an open system
4. An endothermic reaction in a closed system
endothermic reaction in a closed system
300
In Monster's Inc, there is nothing more deadly or toxic than what?
a child
400
the shape, size, or state of the matter changes, but the substance is still essentially the same.
physical change
400
How does something have the law of conservation
There is an equal amount of atoms of each element in the reactants and products.
400
Fill in the PH Scale
400
Which of the following is NOT a factor in the rate of a reaction?
State of reactants (solid, liquid, gas)
Surface area
Temperature
catalyst
pressure
concentration
1. state of reactants
400
what is this slogan from?
What melts in your mouth, but not in your hands
M&Ms
500
What happens when chemical bonds break and new bonds form?
Chemical Change
500
What is the sentence we use when telling whether a substance has the law of conservation or not?
This is/is not the law of conservation because the reactants have the same/different number of atoms than the products
500
Which of the following properties does NOT apply to a base?
a. pH lower than 7
b. Bitter taste
c. Slippery
a. PH lower than 7
500
20 grams of ice in a beaker was heated on a hot plate. After 10 minutes the mass of the liquid left in the beaker was measured again, it was 10g. Does this experiment demonstrate an open or closed system? Why? Explain your answer.
open because the mass decreased (went down) after being measured again which means matter left the solution. Matter can only be transferred in an open system
500
name the seven dwarfs in snow white
- Dopey.
- Doc.
- Bashful.
- Sneezy.
- Happy.
- Grumpy.
- Sleepy.