Test - Unit 2 Matter Flashcards
1
Q
- Increasing the surface area of a solid
A
Increases the speed of dissolving.
U2 C4 page 3 of notes
2
Q
- Which term best describes when particles escape from the surface of a liquid and become gaseous?
A
Evaporation
U2 C3 page 3 of notes
3
Q
- The particles in a liquid are usually
A
Closer together and lower in energy than in a gas.
U2 C3 page 3 of notes
4
Q
- Burning popcorn and making water
A
Chemical change
U2 C2 page 3 of notes
5
Q
- Boiling water
A
Physical change
U2 C2 page 3 of notes
6
Q
- How many grams of NaClO3 are needed to make a saturated solution in 100g of water at 90 degrees Celsius?
A
180g - Line up where the 90 degree Celsius mark is to where the NaClO3 line is.
U2 C4 page 2 of notes
7
Q
- The solubility of which salt is the least affected by temperature?
A
NaCl - the temperature doesn’t make the solubility go up
U2 C4 page 2 of notes
8
Q
- Name one similarity between compounds and homogeneous mixtures.
A
Both involve >1 element
U2 C1 page 2 of notes
9
Q
- Explain how salt dissolves in water.
A
H+ of water attracts to Cl- and the O-2 of water attracts to Na+.
The attractive force pulls ions away from crystal until all the ions are separated because opposites attract.
U2 C4 page 3 of notes
