pH Levels
A pH of 7 indicates this type of substance.
Neutral
What are two ways you can test pH levels?
pH strips, Litmus papers, cabbage juice
What is a mixture called when you can see the different parts?
Heterogeneous mixture
Name the three most common states of matter.
solid, liquid, and gas
What element is Pb?
Lead
Which has a lower pH: lemon juice or baking soda?
Lemon Juice
How does an acid taste?
Sour
Which of the following is a mixture: Titanium, Gold, Concrete, or Silver
Concrete
In which state do particles have the most freedom to move?
What element is Na?
Sodium
On the pH scale, acids have pH values less than this number.
7
How does a base taste?
bitter
What is the difference between an element and a compound?
Element has one type of atom. Compound is two or more elements combined.
What change of state is happening when a liquid becomes a gas?
Evaporation
What temperature does water boil at?
212 degrees Fahrenheit
Name one household substance that is a base and one that is an acid (two answers).
Windex, Lemon Juice (Answers will vary)
Which feels slippery - an acid, base, or neutral?
Base
What is the difference between a compound and a mixture?
A compound is chemically combined. A mixture is not.
Describe how particle arrangement differs between solids and gases (briefly).
Solids touching right next to each other and vibrate in place. Liquids further apart, slide past each other. Gases very far apart, move quickly, and bounce off each other.
Is rusting of iron a physical or chemical change?
Chemical
The pH scale is between which numbers?
0-14
Which acid is stronger- one with a pH level of 2 or one with a pH level of 5?
pH level of 2
Give me an example of a suspension and a colloid.
Snow globe
Gelatin or milk
Give an example of a change of state caused by adding heat and explain what happens to particle motion (two-sentence answer).
Answers may vary- Example Answer
When heat is added to a solid the particles begin to move faster and spread apart. The solid eventually melts to a liquid.
Is cutting a vegetable into pieces a physical or chemical change?
Physical