Download Science Module 3 (1) PDF

TitleScience Module 3 (1)
Tags Proton Chemical Bond Carbon Neutron
File Size120.8 KB
Total Pages5
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SCIENCE PROFICIENCY
(Chemistry)












BEGIN HERE:

1. A gas measures 100 mL at 26 C and 1atm. What will be its volume at 13 C and 0.5 atm?

a. 50 b. 100 c. 150 d. 200


2. Given the following electron configuration, determine the group number and period number of
the element.

1s
2
2s

2
2p

6
3s

2
3p

6
4s

2
3d

10
4p

5



a. Period 4, Group 5 c. Period 3, Group 7

b. Period 5, Group 4 d. Period 7, Group 3


3. Balance the following chemical equations:
C6H12O4 + O2 � CO2 + H2O


a. C6H12O4 + 15/2O2 � 6 CO2 + 7H2O

b. 2C6H12O4 + 15 O2 � 12CO2 + 14H2O

c. 4C6H12O4 + 30 O2 � 24CO2 + 26H2O
d. C6H12O4 + 15 O2 � 6 CO2 + 7 H2O


4. Cyanogen (C2N2) can be prepared by a catalyzed phase reaction between HCN and NO2. The

products of the reaction are C2N2, NO, and H2O. What is the balanced chemical reaction?


a. 4 HCN + 2 NO2 � 2 C2N2 + 4NO + 2H2O
b. 2 HCN + NO2 � C2N2 + NO + H2O

Directions: For each statement or question, choose the letter of the word or expression
that, of those given, best completes or answers the question. Then on your answer sheet,

blacken the circle that corresponds to your final answer.
Notes:
► Calculators of any kind are not permitted. All numbers used are real numbers.

Page 2

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c. 4 HCN + NO3 � 2 C2N2 + NO + 2H2O

d. 2 HCN + 3 NO2 � C2N2 + 3NO + H2O



5. A chemical bond is an attractive force that holds atoms together. What type of chemical bond

which refers to the electrovalent or electrostatic attraction between positive and negative
ions?

a. Ionic Bond

b. Crystal Lattice
c. Covalent Bond

d. Polar Covalent Bond








For nos 6- 8, Fill the table below.



Element Mass # Atomic # Proton # Electron # Neutron #

Radon (6) 53 (7) (8) 74



a. 53 b. 74 c. 106 d. 127


For nos. 9 – 12 refer to the choices below
a. Combination c. Single Replacement

b. Decomposition d. Double Replacement


9. FeCl 2 + Na3PO4 � Fe (PO4)2 + NaCl


10. CaCO3 � CaO + CO2

11. Mg + N2 � Mg3N2

12. Zn + H2SO4 � ZnSO4 + H2



13. What volume of HCl is neeed to prepare 3L of 3 molar hydrochloric acid from 6 molar
solution?

a. 1.0 L c. 2.0 L

b. 1.5 L d. 2.5 L


Nitrogen gas reacts with hydrogen gas to produce ammonia as shown in the following equation:

Page 3

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Science III - 3 -

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N2 + 3H2 � 2NH3


14. How many moles of H2 are needed to react with 2.5 mole N2?

a. 2.5 c. 7.5

b. 5.0 d. 10.0


15. From the answer in no. 14, how many grams of H2 will be produced?

a. 2.5 c. 7.5

b. 5.0 d. 10.0


16. A gas measures 450 mL at a temp of 30C, what will be its volume at 50 C?

a. 250 mL c. 750mL

b. 500 mL d. 1000mL


17. A mixture shows the following properties: Its particles do not settle down, can not be

filtered, and cannot be seen by the naked eye. The mixture does not show the Tyndall
effect. Which of the following best describe this mixture?

a. homogeneous c. colloid
b. solution d. suspension


18. If the volume of one mole of gas molecules remains constant, lowering the temperature will

make the pressure
a. increase c. increase then decrease

b. decrease d. decrease then increase


19. What happens to the volume of a confined gas if its pressure is doubled and its temperature

remains constant?
a. increase c. will remain the same

b. decrease d. all of the above





20. The formula that indicates the local number of atoms of the elements in a compound is the

a. empirical formula c. structural formula
b. molecular formula d. simplest formula


21. What chemical equation will represent the reaction of MgCl2 and KOH?

a. MgK + HCl

b. Mg + KCl2 + H2O
c. MgO + K + HCl

d. Mg(OH)2 + KCl

Page 4

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Science III - 4 -

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22. Which of the following statement is true?
a. Orbitals make up a subshell; subshells make up a shell.

b. Subshells make up a shell; shells make up an orbital.

c. Shells make up an orbital; orbitals make up a subshelll.

d. None of the above.


23. Which of the following does not belong to the group?

a. Molarity
b. Molality

c. Normality

d. Acidity


24. If 50 g of reactants are used up in a reaction, what will be the mass of the products?

a. 25 c. 45

b. 30 d. 50


25. Which of the following is not a chemical reaction?

a. burning paper

b. rusting of metal
c. ripening of fruit

d. freezing carbon dioxide


26. Which of the following is true about sub atomic particles, mass number and atomic number?

a. mass number is equal to the number of neutron
b. proton plus electron is equal to the mass number

c. atomic number is equal to the number of protons
d. neutron number can be calculated given only the mass number


27. In a compound, the sum of the total positive oxidation numbers and negative oxidation

numbers must be equal to _____________.

a. 0 b. 1 c. 2 d. 3


28. Atoms of the same elements having the same atomic number can have different mass
number due to differences in their number of neutrons. These atoms are _______.

a. neutrons b. protons c. isotopes d. isomers


29. Random movement of particles is least observable in what phase of matter?

a. gas b. plasma c. solid d. liquid


30. What are electrons found in an incomplete outer shell of an atom called?

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