Test- Unit 2 Matter Flashcards
1
Q
- Three examples of physical changes are
A
D. boiling of water, blowing up a balloon, and melting a candle
Unit 2 Concept 2 pg. 10
2
Q
- Increasing the surface area of a solid _________.
A
A. increases the speed of dissolving
Unit 2 Concept 4 pg. 33
3
Q
- Which term best describes when particles escape from the surface of a liquid and become gaseous?
A
B. evaporation
Unit 2 Concept 3 pg. 28
4
Q
- Which of the following liquids would be the most viscous?
A
A. syrup
Unit 2 Concept 2 pg. 8
5
Q
- Fragrance of a flower
A
PP
Unit 2 Concept 2 pg. 8
6
Q
- Burning popcorn and making water
A
CC
Unit 2 Concept 2 pg. 10
7
Q
- Boiling water
A
PC
Unit 2 Concept 2 pg. 10
8
Q
- How many grams of NaClO3 are needed to make a saturated solution in 100g of water at 90°C?
A
180 g
Unit 2 Concept 4 pg. 32
9
Q
- List and explain the three factors that increase the solubility ( dissolving) rate of a substance.
A
- ⬇️ solute size ⬆️ rate because more surface area
- ⬆️ temperature ⬆️ rate because more
- stirring ⬆️ rate because because it brings fresh solvent in contact with solute
Unit 2 Concept 4 pg. 33
10
Q
- Name one similarity between compounds and homogeneous mixtures and one difference.
A
similarity- both involve >1 element
Unit 2 Concept 1 pg. 3
11
Q
- Explain how salt dissociates ( dissolves) in water. Be specific.
A
- H+ of water attract Cl-
- O -2 of water attract Na+
- Attractive forcé pulls ions away from crystal
- water surrounds each ion and continues until ions are separated.
Unit 2 Concept 4 pg. 33
