Test - Unit 2 Matter

Question 1

16. Increasing the surface area of a solid _______.

Answer 1

A. Increases the speed of dissolving

U2 C4- notes: Solutions

Question 2

21. A type of matter formed by chemically joining two or more elements is known as a ______.

Answer 2

A. Compound

U2 C1- notes: Classification of Matter

Question 3

22. Which shows Tyndall effect?

Answer 3

A. Colloids

U2 C1- notes: Classification of Matter

Question 4

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

Answer 4

B. Evaporation

U2 C3- notes: States of Matter

Question 5

Label the mixtures as homogeneous (HO) or heterogeneous (HE).

33. Salad dressing

Answer 5

33. HE

U2 C1- notes: Classification of Matter

Question 6

Label the mixtures as homogeneous (HO) or heterogeneous (HE).

35. Peanut Butter

Answer 6

35. HE

U2 C1- notes: Classification of Matter

Question 7

Part 3 Graphical Analysis: Use the solubility curve pictured to the right to answer numbers 44 - 48 below.

44. How many grams of NaClO3 are needed to make a saturated solution in 100 g of water at 90°C

Answer 7

44. 180g

U2 C4- notes: Solutions

Question 8

Part 3 Graphical Analysis: Use the solubility curve pictured to the right to answer numbers 44 - 48 below.

45. In terms of saturation, how would you classify a KBr solution with a concentration of 90 g in 100 g of water at 10°C?

Answer 8

45. Supersaturated

U2 C4- notes: Solutions

Question 9

Part 3 Graphical Analysis: Use the solubility curve pictured to the right to answer numbers 44 - 48 below.

47. At what temperature is the solubility of which salt is the least affected by temperature?

Answer 9

47. 35 degrees.

U2 C4- notes: Solutions

Question 10

54. List the three points of the kinetic-molecular theory.
55. Particles are always moving.
56. Particles always bounce off of each other.

Answer 10

3. All matter is made out of those particles.

U2 C3- notes: States of Matter

Question 11

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

Answer 11

1. Smaller solute seize- increases the surface area on the solute so the solvent has more places for contact.
2. Heating the solvent- increasing the temperature increases the kinetic energy of the particles, therefore more collisions
3. Stirring the solution- brings fresh solvent into contact with undissolved solute.
   U2 C4- notes: Solutions