1. Chemistry is primarily concerned with the composition and changes of?

a. nature

b. matter

c. man

d. earth

Ans: b

2. A scientific theory is?

a. a hypothesis not yet subjected to experimental test

b. an idea that correctly predicts the results

c. an imagination

d. a guess

Ans: a

3. Which of the following units of measurement is equivalent to cubic centimeter?

a. milligram

b. milliliter

c. millimeter

d. centiliter

Ans: b

4. Which of the following is NOT a compound?

a. acetic acid

b. alcohol

c. magnesium

d. zinc oxide

Ans: c

5. The easier the atom loses its electrons, the less its?

a. electro – negativity

b. atomic radius

c. number of shells

d. valence electrons

Ans: d

6. The willingness of atom to received electrons is measured by its?

a. electro – negativity

b. ionization potential

c. atomic size

d. electron affinity

Ans: d

7. A molecule is said to be polar or dipolar if?

a. its’ positive and negative charge are at different places

b. it possesses polar bonds

c. its’ polar bond has unsymmetrical charge distribution

d. all of the above

Ans: d

8. Which of the following is NOT a physical property of water?

a. freezing point at 0 degrees C

b. boiling point at 100 degrees

c. its’ heat of fusion at 80 cal/g.

d. its’ density at 4 degrees at 1 lb/cu. ft

Ans: d

9. which of the following is NOT a physical property of water?

a. molecular weight does not influence boiling and melting point of a substance

b. boiling and melting point tend to increase with molecular weight

c. boiling and melting point tend to decrease with molecular weight

d. none of the above

Ans: b

10. A mole is the amount of substance or the mass of a substance that contains?

a. 6.02 x 1023 particles

b. 60.2 x 1023 particles

c. 6.02 x 1032 particles

d. 60.2 x 1032 particles

Ans: a

11. Which of the following statement is TRUE?

a. hydroxide is present in all bases

b. hydroxide is present in both

c. hydroxide is present in all acids

d. none of the above

Ans: a

12. Instrument which measures the specific gravity of liquids.

a. hygrometer

b. synchro meter

c. hydrometer

d. cyclotron

Ans: c

13. Which property does NOT identify a chemical system?

a. melting point

b. boiling point

c. taste

d. shape

Ans: c

14. The process of spreading out spontaneously to occupy a space uniformly.

a. compression

b. diffusion

c. expansion

d. pressure

Ans: b

15. It is the complex mixture of pollutants.

a. acid rain

b. particulates

c. oxides

d. oxidants

Ans: d

16. Energy removal is best illustrated in?

a. boiling of liquid substances

b. changing water to ice

c. changing water to steam

d. none of the above

Ans: b

17. Refers to the maximum amount of solute expressed in grams that can be dissolved in 100 grams of water at a specific temperature.

a. solubility

b. stability

c. molarity

d. polarity

Ans: a

18. Compounds with the same molecular formula but with different structural formulas.

a. cellulose

b. isomers

c. polymers

d. monomers

Ans: b

19. The most penetrating type of radiation given off by radioactive elements.

a. alpha particle

b. beta particle

c. gamma radiation

d. none of the above

Ans: c

20. The best unit for expressing the masses of individual atoms.

a. atomic number

b. atomic mass unit

c. nucleus

d. atomic weight

Ans: b

21. A substance that speeds up a chemical reaction without itself undergoing a chemical change.

a. catalyst

b. enhancer

c. electrolytes

d. ionizer

Ans: a

22. The temperature at which the vapor pressure of the liquid is equal to the pressure of the surrounding atmosphere.

a. melting point

b. critical point

c. boiling point

d. freezing point

Ans: c

23. The warming of the earth’s surface due to an increase in atmospheric carbon dioxide.

a. “greenhouse effect”

b. ozone

c. atmospheric pressure

d. El Nino phenomena

Ans: a

24. Describes the force of the gravity on an object.

a. mass

b. weight

c. capacity

d. pressure

Ans: b

25. When gaseous molecules are compressed, they tend to?

a. increase in volume

b. decrease in volume

c. repel each other

d. attract and liquefy

Ans: a

26. Chemical reaction always goes to completion if

a. the molarity of reacting solution is increased

b. water is produced

c. the pressures of the reacting substances are increased

d. the weak base is added to a weak acid

Ans: d

27. A compound was found to contain 15g. of carbon and 5g. of oxygen. What is the mass ratio of carbon to oxygen?

a. 4:1

b. 3:2

c. 3:1

d. 5:3

Ans: c

28. An atom is ionized negatively by:

a. sharing with another atom

b. combining with another atom

c. acquiring an election

d. mixing with molecules

Ans: c

29. The average temperature was recorded at 35-degree C. What is the equivalent in Kelvin?

a. 308

b. 300

c. 273

d. 360

Ans: a

30. When gaseous substance is compressed, the result is a decrease in the _______________________

a. size of the particle

b. temperature

c. pressure exerted by the particles

d. distance between the particles

Ans: d

31. An acid substance ________________________

a. denotes proton

b. accepts proton

c. neither donates nor accepts

d. none of the above

Ans: a

32. The separation of substance by the diffusion at different rates through differentially permeable membranes is?

a. diffusion

b. dissociation

c. dialysis

d. distillation

Ans: c

33. What property shows that the water is a compound and not a solution?

a. it is colorless

b. it cannot be filtered

c. it is tasteless

d. it boils at a definite temperature

Ans: d

34. Which of the following is the best technique to loosen two tumblers that are stuck one inside the other?

a. pouring cold water on the outside tumbler after filling the inside tumbler with cold water.

b. pouring hot water on the outside tumbler after filling the inside tumbler with cold water.

c. pouring cold water on the outside tumbler after filling the inside tumbler with hot water.

d. pouring hot water on the outside tumbler after filling the inside tumbler with hot water.

Ans: b

35. Which of the following statement is TRUE of nuclear fission?

a. lighter atoms can be combined to form heaver atoms

b. nucleus of the atoms can be broken or split to produce energy

c. atoms can gain or lose electrons without changing its charge

d. the energy process is identical to that which occurs in the sun.

Ans: b

36. The property of a solution that depends principally upon the concentration of dissolved particles rather than on its nature.

a. chemical property

b. physical property

c. mechanical property

d. colligative property

Ans: d

37. The ability of an atom to attract an electron in a bond.

a. formal change

b. electrons affinity

c. resonance

d. electronegativity

Ans: d

38. Which of the ff. describes an electron.

a. mass of an electron is 1.67 x 1024 grams

b. represents the atomic number.

c. cathode rays are emitted when electricity is passed in an evacuated tube.

d. electrons are positively charged and are massive.

Ans: c

39. The total mass of all substances entering into a chemical reaction is equal to the total mass of all the products of the reaction.

a. Law of Conservation of Mass

b. Law of Definite Proportion

c. Law of Multiple Proportion

d. Boyle’s Law

Ans: a

40. Ano ang tawag sa solusyon kung saan mas marami ans solute kaysa solvent?

a. saturation

b. supersaturated

c. unsaturated

d. diluted

Ans: b

41. Ayon sa “Avogadro’s Law”, kapag ang moles ng isang gas ay nadoble at ang temperature at pressure nito ay pareho parin , ang volume ng gas ay ___________________

a. mahahati sa apat

b. mahahati sa dalawa

c. madodoble

d. matritriple

Ans: b

42. The standard temperature of a gas in 00 and its standard pressure is ____________________

a. 101.3 atm

b. 22.4 atm

c. 1 atm

d. 273 atm

Ans: c

43. The temperature at which the vapor pressure of the liquid is equal to the external pressure.

a. boiling point

b. melting point

c. freezing point

d. balance point

Ans: a

44. This theory states that the tiny particles in all forms of matter are in constant motion.

a. Kinetic Theory

b. Molecular Theory

c. Constant Speed Theory

d. Law of Conservation of Energy

Ans: a

45. A 1-liter sample of gas is at temperature of 3000K; When the temperature is increased to 6000K, the volume_______________

a. increases to 2 L

b. decreases to 0 L

c. increases to 30 L

d. decreases to .5 L

Ans: a