Republic of the Philippines

Department of Education
Region V
Schools Division Office of Camarines Sur
MILAOR NATIONAL HIGH SCHOOL
San Jose, Milaor, Camarines Sur

FIRST QUARTER EXAMINATION

GENERAL CHEMISTRY 1
S/Y 2024 – 2025
Goodluck!
Test I. DIRECTION: Read and analyze the following questions. Choose the letter of the correct answer. Write the answer on the
space provided below each number.
_____1. It is called as the smallest particles of a matter that is capable of independent existence?
A. atoms B. molecules C. electron D. proton
_____2. Which of the following sub-atomic particles is found outside the nucleus of an atom?
A. electron B. neutron C. positron D. proton
_____3. The diagram shows particle in container. Which two diagrams show the process of evaporation?
A. 1-2
B. 1-3
C. 2-3
D. 3-1
_____4. What Law states that the total mass of reactants is equal to the mass of the products?
a. Law of definite proportion c. Law of conservation of mass
b. Law of multiple proportion d. Law of indefinite proportion
_____5. What do you call the term referred to anything that occupies space and has mass?
a. chemical Change b. matter c. physical Change d. properties of matter
_____6. Which statement best explains the fact that gases can be compressed?
A. The particles in a gas do not have a fixed volume.
B. The particles in a gas are very far apart.
C. The particles in a gas have no force of attraction (bonds) between them.
D. The particles in a gas are constantly moving very rapidly.
_____7. When an iron bar is heated it gets longer. This is because the particles in the bar
A. Change shape B. get bigger C. get close together D. move further apart
_____8. Which of the following property of matter depends on the amount of substance present?
a. chemical Property b. extensive Property c. intensive Property d. physical Property
_____9. A process in which one or more substances are changed into new substance with different physical and chemical
properties.
A. Physical Properties B. Physical Reaction C. Chemical Properties D. Chemical Reaction
____10. If you leave a piece of iron in the open for a few days, It acquires a film of brownish substance called rust.
A. There's no actual difference between them, it is still the same.
B. No, we cannot change rust back into iron because it's a chemical change and the properties of a chemical change are
I irreversible and give a new object.
C. Yes, rusting of iron is a chemical change because a new substance is produced.
D. Burning of wood and Wood oxidation
f you leave a piece of iron in the open for a few days, It acquires a film of brownish
substance called rust.
A. There's no actual difference between them, it is still the same.
B. No, we cannot change rust back into iron because it's a chemical change and the
properties of a chemical change are irreversible and give a new object.
C. Yes, rusting of iron is a chemical change because a new substance is produced.
D. Burning of wood and Wood oxidation
f you leave a piece of iron in the open for a few days, It acquires a film of brownish
substance called rust.
A. There's no actual difference between them, it is still the same.
B. No, we cannot change rust back into iron because it's a chemical change and the
properties of a chemical change are irreversible and give a new object.
C. Yes, rusting of iron is a chemical change because a new substance is produced.
D. Burning of wood and Wood oxidation
_____11. What is the density of ice if it has a volume of 150 cm3 and has a mass of 20g?
a. 0.10 g/cm3 b. 0.11 g/cm3 c. 0.12 g/cm3 d. 0.13 g/cm3
_____12. It is the ability of substance to be hammered or transformed into thin sheet. This
can be seen among metals like bracelet, tin cans and metallic roofs of our houses.
A. Extensive Physical Property B. Ductility
B. Intensive Physical Property D. Malleability
_____13. It is the process of separating the insoluble solid from the liquid substance by allowing the liquid to pass through a
porous material called filtering agent.
A. Decantation B. Mechanical Separation C. Filtration D. Centrifugation
_____14. What is the correct order for obtaining salt from a mixture of salt and sand?
A. Filtration –Dissolving in water – Evaporation B. Evaporation – Filtration – Dissolving in water
C. Dissolving in water – Filtration –Evaporation D. Dissolving in water – Evaporation -Filtration
_____15. A substance that can't be chemically broken down into simpler substances is
A. a homogeneous mixture. B. an element. C. a heterogeneous mixture. D. a compound.
_____16. Identify the pure substance from the list below.
A. lemonade B. salt C. air D. wine
_____17. What criteria would you use to assess to differentiate pure substance from mixture?
A. A pure substance consists only of one element or one compound, a mixture consists of two or more different
substances, not chemically joined together.
B. A mixture consists only of one element or one compound, a pure substance consists of two or more different
substances, not chemically joined together.
C. A mixture is composed of at least one kind of particles.
D. None of these
_____18. Distinguish the element from the list below. A. sodium chloride B. table salt C. hydrogen peroxide D. iron
_____19. Which two of the following statements are correct?
A. An element is always represented by a symbol consisting of two letters such as He.
B. Elements consist of only one type of atom.
C. A compound can easily be split up into its different elements.
D. Compounds consist of two or more different types of atom.
_____20. This separates heterogeneous mixtures by spinning them at very high speeds, which forces components to
separate into layers.
A. Magnetism B. separating funnel C. Distillation D. centrifugation
_____21. A magnet could be used to separate
A. Sand and salt B. colors in a food dye C. Sand and iron filings D. water and sand
_____22. The formula of Sodium Acetate is_____________
_____23. Which combination of atoms is most likely to produce a compound with ionic bonds?
A. Al and F B. P and H C. C and O D. Na and Cl
_____24. Which of these common substances is a homogeneous mixture?
A. table salt B. pure water C.whole milk D. maple syrup
_____25. The diagram below shows a magnet near a pile of particles of iron and sulfur. The magnet attracts the iron,
separating it from the mixture. Based on the diagram, which statement is true?
A. The parts of a mixture keep their own properties.
B. The elements in a compound keep their own properties.
C. The properties of a mixture are different from the properties of its parts.
D. The properties of a compound are different from the properties of its elements.
____26. The element is an essential mineral for the diet. It is the mineral that makes up bones and teeth.
A. Cost B. Produced Product C. Average consumer D. Consumer Products
____27. Designer’s clothes is an example of what consumer product?
A. Convenience product B. Shopping product C. Specialty product D. Unsought product
____28. Give the number of significant digits in the following measurements: 1278.50
____29. Round off the following numbers to three significant digits: 5.457
____30. Which of the following statements best defines the law of conservation of mass?
A. Mass cannot be created but it can be destroyed under extreme pressures.
B. Mass cannot be conserved during a chemical reaction; a little bit of mass is always lost.
C. The mass of a closed system cannot change over time; mass cannot be created nor destroyed.
D. When added to a system, energy can destroy mass.
____31. This refers to the ratio of the elements present in a compound.
a. Empirical Formula b. Molecular Formula c. Structural Formula d. Condensed Structural Form
____32. John Dalton taught that atoms;
A. contain molecules B. cannot be broken down into simpler forms
C. are all composed of carbon D. have no mass
____33. In 1808, John Dalton established his atomic theory . Which of the following is not part of Dalton’s atomic theory?
a. All matter is composed of atoms
b. An atom is composed of a nucleus and a cloud of electrons
c. Atoms cannot be created nor destroyed
d. In chemical reactions, atoms are combined, separated or rearranged
34-37. Here are three isotopes of an element :

____34. The element is __________________

____35. Differentiate each isotope______________________________________
____36. What are your criteria to be called as isotopes depend your answer_____________________________________
____37. How many protons and neutrons in the first, second and third isotope___________________________________
____38. Write the symbol for the isotope with 8 protons and 8 neutrons ________________________________________
____39. Write the symbol for the isotope with 28 protons and 30 neutrons_______________________________________
____40. Atoms of the same element that have the same number of protons but different
in the number of neutrons.
A. Isotopes B. Mesotopes C. Neutron D. Proton
____41. Which of the following is the correct statement of (i) Atomic number, (ii) Mass number, (iii) Isotopes
A. Atomic number: The atomic number is the total number of protons present in the atom.
B. Mass number: It is the sum of the number of neutrons and the number of protons.
C. Isotopes are the elements having same atomic number but different mass number.
D. All of these are correct
____42. Which of the following is a binary compound?
a. NaCl b. C6H12O6 c. K2SO4 d. Iron (III) Sulfate
____43. Name the following binary molecular compound: N2O2
A. dinitrogen tetraoxygen B. dinitrogen tetraoxide C. 2 nitrogenoxide D tetraoxygen dinitride
____44. Which of the following reasons best explains the significance of writing formulas of compounds?
a. To give a design to chemical compounds or substances.
b. To know if the substance is made of 2 or more element.
c. To give information about chemical proportion of atoms.
d. To give students a hard time in writing it.
____45. What shows the number and kind of atoms present in one molecule?
A. Chemical formula C. Molecular composition B. Empirical formula D. Percentage composition
Test II. 46-55. Write the name and the chemical formula of the following;
1. BeBr2 = ________________________________ 6. Co (NO2)3 = ____________________________
2. Na2O = ________________________________ 7. Potassium perchlorate = ___________________
3. OsO4 = ________________________________ 8. Aluminum sulfate = _______________________
4. XeO3 = ________________________________ 9. Dinitrogen pentasulfide = __________________
5. Krypton difluoride = _______________________ 10. Sulfur trioxide = _________________________

Test III. 56-65. Write the Molar mass and percent composition of the following;
1. C6H12O6
2. C9O10
3. Jose has a compound consist of 43.64% P and 56.36% O. What is the empirical formula of this compound?

-End of exam-