Test - Unit 2 Matter

Question 1

Which term best describes when particles escape from the surface of a liquid and become gaseous?

Answer 1

B. evaporation

Question 2

How many grams of NaClO3 are needed to make a saturated solution in 100g of water at 90 degrees Celsius?

Answer 2

180g.

Question 3

List and EXPLAIN the three factors that increase the solubility (dissolving) rate of a substance.

Answer 3

a. smaller solute size - increases rate b/c of more surface area
2. heating the solvent - increases rate b/c it makes the kinetic energy go up which makes the particles collide more
3. stirring the solution - increases rate b/c it brings fresh solvent in contact w/ solute

Question 4

forgot units on this density calculations problem: A piece of wood that measures 3 cm by 6 cm by 4 cm has a mass of 80g. A) What is the density of the wood? B) If the density of water is 1 g/mL, then would the wood float in water?

Answer 4

the volume for the calculation would be 72 cm cubed