Chapter 2 (Review)
A. Read the sentences carefully. Then choose the best answer.

1. A violet, solid material was heated. A gas was released and a white crystalline solid was produced. How do we classify the original

substance?
a. An element
b. A compound
c. A metal d. A nonmetal

2. Sunlight passing through a window is scattered by dust particles. What kind of mixture is dust in air?

a. Solution
b. Colloid
c. Emulsion
d. Coarse mixture

3. Which of the following statements shows an extensive property?

a. Iron nails conduct heat
b. Sampaguita flowers smell sweet
c. Alcohol boils at 80.5 degrees Celsius

d. A pinch of sugar weighs about 2.3 grams

4. Which of the following is a physical property?
a. Decaying of fruit
b. Freezing of water
c. Corroding of metal d. Healing of wound

B. Read the sentences carefully. Then answer them briefly.

1. Given an unknown substance, find a way by which you can identify whether it is a metal or nonmetal.

2. Recommend something to take for someone who has an acidic stomach. Give your reasons.

3. Given a homogenous system, state what you can use to check if it is a pure material or mixture.

Chapter 9 (Review)
A. Read the sentences carefully. Then choose the correct answer.

1. Water in rivers and lakes contains a sufficient amount of dissolved oxygen to support aquatic life.

This amount of dissolved oxygen should be at least
a. 5 ppm
b. 10 ppm
c. 15 ppm d. 20 ppm

2. Which is the most concentrated solution?
a. 2 x 10 (raised to the negative 3 power) mole solute / 100 mL solvent

b. 0.04 mole solute / 10 litres of solution
c. 0.3 mole solute/ litre of solution

d. 4 x 10(raised to the negative 4 power) mole solute/ 10 mL solvent

3. Crystals of a solute were dissolved in warm water until most of them disappeared.

Then the solution was cooled with ice water crystals reformed. What factor/s affected the solubility of the substance?

a. Nature of solvent
b. Nature of solvent and solute
c. Nature of solvent and solute, and temperature

d. Nature of solvent and solute, and pressure

4. An electrolyte lowers the freezing point of water by 5.58 degrees Celsius. Which statement about the crystal is true?

a. It ionizes completely into two particles per molecule
b. It ionizes partially into three particles per molecule

c. It does not dissociate
d. It dissociates partially into four particles per molecule

5. Which of the following will have the lowest vapor pressure?

a. A solution of 1 M NaCl
b. A solution of 1 M NH3
c. A solution of 2 M MgCl2
d. H2O

6. A substance has a pH of 6. It is said to be
a. Very basic
b. Slightly acidic
c. Slightly basic d. Neutral

7. A solution contains 0.001 M HCl. Its pH is
a. 2
b. 3
c. 4 d. 11

8. Hydrolysis of this salt will yield an acidic solution:
a. Na2CO3
b. FeCl3
c. NaCl

d. NH4CH3COO

9. Which of the following solutions is not an electrolyte?
a. NaNO3
b. KOH
c. C2H5OH

d. HCl

10. A medicine dropper is calibrated by counting the number of drops that deliver 1

mL, the volume of a drop is:
a. 0.5 mL
b. 0.05 mL
c. 0.005 mL d. 0.25 mL

11. Some acid-base reactions are given below. In which case, is there a complete neutralization using equal volumes of the acid and base?

a. ½ mole H2SO4 + 1 mole NaOH
b. 1 mole H2SO4 + 1 mole NaOH
c. 2 moles H2SO4 + 1 mole NaOH
d. 1 mole H2SO4 + 2 moles NaOH

12. To neutralize basic soils that may contain insoluble hydroxides or carbonates, you may add

a. Phosphorus
b. Nitrogen
c. Limestone
d. Sulfur compounds

B. Answer the following briefly.
1. A common way of peddling ice cream in small towns is in carts containing the ice cream in gallons packed

with ice and salt. Why is salt added to the ice?
2. Why can you dissolve sugar faster in hot tea than in iced tea?

3. To prepare 100 mL of 5 M HCl from 36 M HCl, how many milliliters of concentrated HCl will you use?

Chapter 10 (Review)
A. Choose the correct answer.

1. Which of the following is NOT a colloid?
a. Cloud
b. Rubbing alcohol
c. Blood

d. Smoke

2. Which of the following is a dispersion of a solid in a liquid?
a. Alloy
b. Blood
c. Cooked starch

d. smog

3. A colloidal system consisting of a gas mixture suspended in a very viscous liquid is a/an:
a. Aerosol
b. Emulsion
c. Foam

d. Gel

4. Soap-making involves the process called:
a. Saponification
b. Sulfonation
c. Hybridization

d. Polymerization

5. Which of these properties best explains why charcoal is used in gas masks?
a. Tyndall effect
b. Surface tension
c. Brownian method

d. adsorption

6. This material is added to ice cream to prevent large crystals of ice from forming during the freezing process:
a. Sugar

b. Nonfat milk
c. Carrageenan
d. butterfat

B. Answer the following briefly.
1. Describe the principle behind dialysis.

2. Name at least five household products made by colloids.
3. What are the characteristics of a good jelly?

mk.

hahaha.

bkt importane ang chem sa sales agent? x

xD

ohh

xD

ahm... kc... pra mas ma-explain nila ung mga products n binebenta nila? xD hahaha

ay mk! ung chapter 2 b, another paper let?

hmmm... tuloy tuloy nln kya an gawin mu... lagyan mu nln ng labels

ukii.

hmm cge gwa k n muna... sbihin mu ln pag may tnong k ha? ccmulan q n dn yan xD

okii. thaaaanks

mkkk! tpos kn?

mk. pssssssst!

tulog nko mk. tinapos mu n pla ibay sakin upto chapter 10. thank you! thank you tlg! an effort mo

Goo night my love! Sleep tight. See you ttom. 6 labas nten. I love you

!!!!!!!!!!!!!!!!!!!! :*

yea.. inuna q n muna ikaw e... mas kelangan mu kc.. aun kktpos ln s chapter 1 xD

ahm.. cge cge... goo night :* & yer welcome

see yah... & i love yah more!