What type of change involves changing the appearance of a substance?
Physical Change
100
What is the density of water?
1.0 g/ml3
100
When a reaction releases heat energy that is called an:
exothermic reaction
100
What pH must a substance be to be considered an ACID?
0-6
100
Name two examples of an acid.
battery acid, soda, lemon juice
200
What type of change involves changing the substance into new substances?
Chemical Changes
200
Put these in order from most dense to least dense:
lead ball 3.5
water 1.0
rubber band 0.8
corn syrup 2.3
from the BOTTOM: lead ball, corn syrup, water, rubber band
200
When a reaction absorbs heat energy and uses it up that is called an:
endothermic reaction
200
What pH must a substance be to be considered a base?
8-14
200
If I am using litmus paper to find the pH of a substance, am I testing a physical property or chemical property?
chemical property
300
Name two examples of a chemical change
possible answers: burning something, cooking something, ph indicator, mixing two chemicals that react
300
What is the formula for density?
Density = mass / volume
300
You mixed two substances together and the temperature increased, this is an example of an:
exothermic reaction
300
What is the pH of pure water? Is it considered an acid, base, or neutral?
7
300
How would you find the volume of an object that could not be measure with a ruler? (an irregular shaped object)
use a graduated cylinder, use water displacement
400
Which of the following are physical properties of matter?
A. size, shape and color
B. density, hardness, texture
C. phase of matter (solid, liquid gas)
D. all of the above
D. All of the above
400
What two things must you know about something to find it's density?
It's volume and mass
400
You mix two substances together and the temperature decreased:
endothermic reaction
400
Which of these substances is the MOST BASIC?
Ammonia pH 11.6
Apple Juice pH 3.0
Baking Soda pH 8.0
Grapes pH 4.0
Lye pH 14
LYE, pH of 14
400
When you are gathering information for an experiment how much information should you gather?
As much as possible!!
500
Jenny uses a strip of litmus paper to find out the pH of a substance. Is this a physical or chemical change?
Chemical Change
500
Sally placed two liquids in a column (liquid A and then liquid B).
Sally also placed a piece of plastic in the column and it settled between Liquid A and Liquid B.
What can we conclude about the density of the plastic?
The plastic is less dense that Liquid A, but more dense than Liquid B.
500
To prove an endothermic and exothermic reaction you should:
take the temperature before and after the reaction
500
If an unknown chemical spilled on our classroom floor, what would be the safest way to determine if it is an acid or base? Be specific.
Use a pH indicator such as cabbage juice or litmus paper.
500
What do physical and chemical properties have in common?