7/27/2019 2nd Periodical Test III-Bright 2013-2014

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Republic of the PhilippinesDepartment of Education

Region IV A CALABARZONDivision of Rizal

DON JOSE YNARES SR. MEMORIAL NATIONAL HIGH SCHOOL

SECOND PERIODICAL EXAMINATION, SY 2013-2014Advanced Chemistry

NAME: ____________________________________ DATE: _______________YEAR & SECTION: III-BRIGHT SCORE: _____________

MULTIPLE CHOICE

DIRECTIONS: Each of the statement is fol low ed by four choic es.

Select the one that best answ ers the quest ions and ENCIRCLE

the let ter of the correct answ er.

1. Which of the following is NOT TRUE about the particles in gas?A. They are moving at high velocities.B. They are arranged in regular patterns.C. Their collisions with the walls of the vessel result in pressure.D. They can spread out from the vessel in which they are

contained.2. An enclosed cylinder is filled with helium gas. Which of thefollowing diagrams shows the arrangement of the helium atoms?

3. An inflated balloon will shrink when it is placed in a freezer. This isbecause at a lower temperature, the air particles

A. travel at slower velocity and move closer together.B. travel at slower velocity and move further apart.C. travel faster and move closer together.D. travel faster and move further apart.

4. The boiling point of carbon tetrachloride is 76C. Which of thefollowing statements is TRUE about the molecules of carbontetrachloride at 80C?

A. The carbon tetrachloride molecules become lighter.B. The kinetic energy of the carbon tetrachloride molecules is

lower.C. The forces of attraction of the carbon tetrachloride molecules

become weaker.D. The distance between the carbon tetrachloride molecules

decreases.5. If the gas in a container occupies a volume of 40 cc underatmospheric pressure,

the volume of the same gas will be reduced to 20 cc byA. reducing the pressure by .B. keeping the pressure constant.C. increasing the pressure 2 times.D. increasing the temperature 2 times.

6. It takes shorter time to cook food in a pressure cooker becauseA. the amount of vapor inside decreases.B. the pressure is proportional to the volume of gas.C. foods are kept in a container with an airtight cover.D. the pressure inside increases as the temperature increases.

7. Given the table below, which gas molecules travel fastest?

NH3 NO2 O2 HCl

Temperature (C) 25 25 25 25

Volume (L) 5.00 5.00 5.00 5.00

Molecular Mass (a.m.u.) 17 46 32 36

A. NH3 B. NO2 C. O2 D. HCl

8. Initially, the balloons shown below have the same volume. After afew hours, the same balloons have different volumes. Whatexplanation best fits this condition?

A. H2 is denser than He and O2.B. He is the most dense and diffuses slower than H2 and O2.C. He and O2 have similar densities and diffuse at the same rate.D. H2 is the least dense and diffuses through the balloon faster thaneither He and O2.9. A sample of gas in a cylinder has a 10-L volume and a pressure of1 atm. Suppose the gas is to be transferred to a 4.5-L cylinder at thesame temperature, the new pressure of the gas will be

A. lower than the original pressure.B. higher than the original pressure.C. two time the original pressure.D. the same as the original pressure.

10. A gas at 25C in a 10.0 L sealed stainless steel tank has apressure of 1.00 atm. When the temperature in the tank is doubled to50C

A. the volume of the tank doubles.B. the pressure of the tank doubles.C. the number of moles of gas doubles.D. the kinetic energy of the molecules increases.

11. A mixture of oxygen, nitrogen, and hydrogen gases exerts a totalpressure of 740. mmHg at 0C. The partial pressure of the oxygen is

200. mmHg and the partial pressure of the nitrogen is 400. mmHg.What is the partial pressure of the hydrogen gas in this mixture?

A. 140. mmHg B. 200. mmHgC. 400. mmHg D. 740. mmHg

12. Charless Law states that if a given quantity of gas is held at aconstant pressure, then its volume is directly proportional to theabsolute temperature. This law explains why --

A. the pressure of a gas increases when volume decreases.B. a gas-filled balloon expands when it is heated.C. solids require heat in order to change into gases.D. some gases only react with each other at high temperatures.13. The volume of 400 mL of chlorine gas at 400 mm Hg is decreasedto 200 mL at constant temperature. What is the new gas pressure?

A. 400 mm Hg C. 300 mm HgB. 800 mm Hg D. 650 mm Hg

13. Standard temperature and pressure (STP) are defined as

A. 0C and 1.0 atm pressure.B. 0C and 273 mm Hg pressure.C. 0 K and 1.0 atm pressure.D. 0 K and 1.0 760 mm Hg pressure.

14. The total pressure of an O2-Ar-He gas mixture is 755 mm Hg. Ifthe partial pressure of Ar is 174 mm Hg and the partial pressure of Heis 389 mm Hg, then the partial pressure of O2 is --

A. 192 mm Hg. C. 282 mm Hg.B. 366 mm Hg. D. 563 mm Hg.

15. Industrial deep-sea divers must breathe a mixture of helium andoxygen to prevent a disorienting condition known as nitrogen narcosis.If a divers tank is filled with a helium-oxygen mixture to a pressure of170 atmospheres and the partial pressure of helium is 110atmospheres, the partial pressure of the oxygen is--

A. 60 atm C. 110 atmB. 140 atm D. 280 atm

16. A sample of nitrogen occupies 10.0 liters at 25C and 98.7 kPa.

What would be the volume at 20C and 102.7 kPa?A. 7.87 L C. 9.45 LB. 10.2 L D. 10.6 L

17. Why does the pressure build up in a tire on a hot day? (Assumethat tire volume is constant.)

A. As temperature increases, kinetic energy increases.B. As temperature increases, kinetic energy decreases.C. As temperature increases, pressure also increases.D. Both A and C

18. Results of Firing Alpha Particles at Gold Foil

OBSERVATION PROPORTIONAlpha particles went straight through gold foil. >98%Alpha particles went through gold foil but weredeflected at large angles.

2%

Alpha particles bounced off gold foil. 0.01%

What information do the experimental results above reveal about thenucleus of the gold atom?

A. The nucleus contains less than half the mass of the atom.B. The nucleus is small and is the densest part of the atom.C. The nucleus contains small positive and negative particles.D. The nucleus is large and occupies most of the atoms space.19. Which of these statements resulting to Daltons atomic theory arestill true today?I All atoms of an element are identical in mass.II Atoms are indivisible and indestructible.III Atoms of elements combine in the ratios of small whole numbers to

form compounds.A. I and II B. I only C. II and III D. III only

7/27/2019 2nd Periodical Test III-Bright 2013-2014

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20. Which of the following groupings of scientists with their discoveriesis correct?The scientist who discovered the

electron proton neutronA Ernest Rutherford J.J. Thomson James ChadwickB J.J. Thomson Ernest Rutherford James ChadwickC J.J. Thomson Ernest Rutherford Niels BohrD J.J. Thomson James Chadwick Ernest Rutherford21. An atom of hydrogen emits a photon when its electron

A. jumps from a lower-energy orbit to a higher-energy orbit.B. jumps from a higher-energy orbit to a lower-energy orbit.C. combines with a proton.

D. combines with a neutron.22. The negatively charged particles moving about in the outer part ofthe atom are

A. neutrons C. electronsB. shells D. protons

23. What particle(s) account(s) for most of the mass of an atom?A. proton C. neutron and protonB. electron and proton D. neutron

24. Rutherfords gold foil experiments showed that ____I the raisin bread or plum-pudding model of the atom was

incorrect.II most of the mass of an atom is concentrated in a tiny portion of

its total volume.III the positively charged particles within an atom are

concentrated in a tiny portion of its volumeIV alpha particles are less massive than gold nuclei.

A. I, II and III onlyB. II, III and IV onlyC. I, III and IV onlyD. I, II, III and IV

25. In the experiment done by JJ Thomson, cathode rays weredeflected away from a negatively charged plate. Why?

A. Cathode rays are not particles.B. Cathode rays are positively charged particles.C. Cathode rays are negatively charged particles.D. Cathode rays are neutral particles.

26. Which drawing best illustrates the phenomenon responsible for thecolors of the

elements?

27. Which of the following statement is NOT true of the atomic modelproposed by Bohr?

A. The hydrogen atom is made up of a positively chargednucleus.

B. The electron revolves around the nucleus in a circular orbit.C. The energy of the electron in a give orbit is not fixed.D. An electron may absorb or emit a quantity of radiation.

PROBLEM SOLVINGDirections: Compute for the following problems. Write the given andshow your computations. The answer should be to the correct

significant figures (when necessary). You can use the periodic tableand calculator.

1. A chemist dissolves 98.4 g of FeSO4 in enough water to make2.000 L of solution. What is the molarity of the solution?

2. Calculate the % composition of the elements in the compoundCuSO4.

3. Find the empirical formula for a compound containing 10.4 % C,61.7 % Cl, and 27.8 % S by mass.

4. A compound has an empirical formula of CH2 and a molecular massof 42 g. Determine its molecular formula.