Random #1
What is an acid?
Substance that releases hydrogen when added to water. 0-6 on the Ph scale.
What is a reversible change?
A change that can be changed back to its original state.
When blue litmus paper turns red, it's a...
Acid
What is chemistry?
The study of matter and how it changes.
Is colour changing a sign of a chemical change?
True or False:
Sand and rocks are a solid-solid mixture.
True
When we crack a glowstick, and it lights up, what type of change is that?
Chemical change
When both the red and blue litmus papers stay the same, the substance is a...
Neutral
What type of mixture is water and vinegar?
liquid-liquid
What is a base?
A substance that releases hydroxide when added to water. 8-14 on the Ph scale.
True or False:
Sugar and salt will dissolve in water.
True
What is cohesion?
The sticking together of particles of the same substance.
True or False:
You can tell something is an acid by only testing with a red litmus paper?
False
What type of mixture is salt and water?
Solid-liquid
What is a solution?
A mixture where the particles have completly dissolved.
What is a suspension?
A mixture where some particles do not dissolve.
What is a physical change?
A change that does not create a new substance.
What is a heterogenious mixture?
unevenly mixed. You can see all the parts.
Is producing heat a sign of a chemical change?
Yes
What technique would you use to separate rocks and sand?
Sieve
What is decanting?
Using an eyedropper to separate liquid-liquid mixtures.
When red litmus paper turns blue, the substance is a...
Base
What is a homogenious mixture?
Evenly mixed. You cannot see the separate parts.
Is taste changing a sign of a chemical change?
No
Is burning wood a reversible change?
No