Mixtures and Solutions
What is a mixture?
Water has a high or low surface tension?
High
Chemical changes are reversible or irreversible?
When baking soda and vinegar are mixed what gas is produced?
Carbon dioxide
On a pH chart 7 is considered what?
Neutral
What is a solution?
Type of mixture where one substance is dissolved into another.
The invisible film or skin that covers water is called what?
Surface tension
Cookie batter being baked is an example of what kind of change? (physical or chemical)
Chemical
True or False. Plants use carbon dioxide.
True. In photosynthesis
On a pH scale 1 is considered what?
Acidic
Is a solution a mixture?
Yes
Tell me 3 ways to separate different materials.
Cutting a cloth is an example of what kind of change? (physical or chemical)
Physical
When we breathe out we breathe out oxygen or carbon dioxide?
Carbon dioxide
True or False Cabbage juice can indicate pH level of a substance?
True
What is a solute?
Substance dissolved in another substance.
When insects appear to walk on water this is because of what?
Surface tension
Burning a log is an example of physical or chemical change?
Chemical
CO2 stands for what?
Carbon dioxide.
1 Carbon atom and 2 oxygen atoms
Something that has a low concentration of hydrogen, a bitter taste, and feels slippery is a what?
Base
What is a solvent?
Substance that dissolves the other substance.
If I had a glass of water and dissolved salt and iron, how would I separate all three mixtures?
magnet, filter, evaporation
Freezing water is an example of a physical or chemical change?
Physical
True or false. When you add carbon dioxide to a fire it will put out the fire.
True
What is the process called when I take an antacid tablet?
Neutralization