Test - Unit 2 matter Flashcards
1
Q
- Three examples of physical changes are
A
B. Burning of gasoline, rotting an egg, and exploding of fireworks
U2 C4 matter pg-1
2
Q
- Matter in which the particles are free to move in all directions until they have spread evenly throughout their container is a
A
C. Gas
U2 C4 matter pg-1
3
Q
- Which term describes when particles escape from the surface of a liquid and become gaseous?
A
B. Evaporation
U2 C4 matter pg-2
4
Q
- The particles in a liquid are usually
A
D. Closer together and lower in energy than in a gas
U2 C4 matter pg-2
5
Q
- How many grams of sodium chlorate are needed to make a saturated solution in 100g of water at 90 degrees Celsius?
A
180g
U2 C4 matter pg-3
6
Q
- In terms of saturation, how would you classify a KBR solution with a concentration of 90g in 100g of water at 10 degrees Celsius?
A
Supersaturated
U2 C4 matter pg-3
7
Q
- In terms of saturation, how would you classify a potassium nitrate solution of 30g in 100g of water at 40 degrees Celsius?
A
Unsaturated
U2 C4 matter pg-3
8
Q
- Bose-Einstein condensates are used to simulate conditions in
A
A black hole
U2 C4 matter pg-4
9
Q
- Iron and oxygen react to form rust. What will happen to the mass of the rust compared to the mass of the iron and oxygen before the reaction? Explain why this will occur
A
It will stay the same because law of conservation of mass says no matter can be created or destroyed, even in a Chemical change
U2 C4 matter pg-4
10
Q
- List and explain the three factors that increase the solubility rate of a substance
A
- smaller solute size and higher rate because more surface area
- heating the solvent and higher rate because more kinetic energy / particles collide more
- stirring up solution and higher rate because it brings fresh solvent in contact with solute
U2 C4 matter pg-5
11
Q
- Explain how salt dissolves in water.
A
- positive H of water attracts negative Cl
- negative O2 of water attracts positive Na
- attractive force pulls ions away from crystal
- water surrounds each ion and continues until all ions are separated
U2 C4 matter pg-6
