Directions: Read carefully each item.
Write only the letter of the correct
answer for each question. Use a
separate sheet of paper for your answer.
A chemical reaction is in which the
bonds are broken within reactant
molecules, and new bonds are formed
within product molecules in order to form
a new substance. Due to the vast amounts of
chemical reactions happening around us, a
nomenclature was developed to simplify how we
express a chemical reaction in the form of a chemical
equation. A chemical equation is nothing but a
mathematical statement which symbolizes the
product formation from reactants while stating certain
condition for which how the reaction has been
conducted.The reactants are on the left-hand side
whereas the products formed are on the right-hand
side. The reactants and products are connected by a
one-headed or two-headed arrows. For example, a
reaction A + B → C + D.Here, A and B are the
reactants, which react to form the products
C and D. In an actual chemical equation, reactants
are denoted by their chemical formula. In order to
assure the law of conservation of mass, a chemical
equation must be balanced i.e. the number of atoms
on both sides must be equal. This is the balancing of
the equation.
For questions 1 and two, refer to the
equation given below:
Sucrose (C12H22O11)
+ oxygen → carbon dioxide + water +
heat
\
1. What are the reactants in the given
equation? a. carbon dioxide and oxygen
c. oxygen and water b. carbon dioxide
and water d. sucrose and oxygen
2. What are the products in the
equation? a. carbon dioxide and oxygen
c. oxygen and water b. carbon dioxide,
water and heat d. sucrose and oxygen
3. What do you refer to the substance
that is produced from chemical
reactions? a. mole c. product b. letter d.
reactant
4. What do you refer to the substance
that is used up during a chemical
reactions? a. letter c. product b. mole d.
reactant
5. How will the reactants and products
be presented in a given chemical
equation? a. Products are written on the
left while reactants are on the right b.
Products and reactants are both written
on the left and the right. c. Reactants
are written on the left and products are
on the right d. All the given choices are
correct. It depends on the chemical
reaction.
6. How many atoms of hydrogen (H),
sulfur (S), and oxygen (O) are there in
sulfuric acid (H2SO4)?
a. H-1, S-2, O-8 c. H-2, S-4, O-4
b. H-2, S-1, O-4 d. H-6, S-4, O -4
7. Which statement explains the Law of
Conservation of Matter?
a. In a chemical reaction, matter can
only be created.
b. In a chemical reaction, matter can
only be destroyed.
c. Matter can neither be created nor
destroyed in a chemical reaction.
d. Matter can either be created or
destroyed in a chemical reaction.
8. In the given chemical reaction, what
will be the correct count for the atoms of
the reactants?
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l),
a. 1 carbon atom, 4 hydrogen atoms,
and 2 oxygen atoms
b. 1 carbon atom, 4 hydrogen atoms,
and 4 oxygen atoms
c. 4 carbon atoms, 4 hydrogen atoms,
and 2 oxygen atoms
d. 4 carbon atoms, 4 hydrogen atoms,
and 4 oxygen atoms
9.According to the Law of Conservation
of Mass, what is the total mass of the
reacting substances?
a. always equal to the total mass of the
products.
b. always less than the total mass of the
products.
c. always more than the total mass of
the products.
d. sometimes more and sometimes less
than the total mass of the products.
10.In a chemical reaction, what is the
relationship between the total mass of
the reactants and the total mass of the
products? a. The mass of the products
must be greater. b. The mass of the
reactants must be greater. c. They must
be equal. d. There is no general
relationship between the two.
TYPES of CHEMICAL REACTION 1.
Combination or Synthesis - a reaction
when two or more elements combine to
form a single product. General equation:
A + B → AB
2. Decomposition - a single reactant
breaks down into simpler ones. It is the
opposite of combination reaction.
General equation: AB → A + B
3. Single Displacement (Replacement) –
A substance; it can be an element or a
compound; capable of replacing one of
the atoms of a given compound.
General equation: AB + C → AC + B
4. Double Displacement (Replacement)
– a reaction in which ions get
exchanged between two reactants,
resulting to the formation of a new
compound. General equation: AB + CD
→ AD + CB
5. Combustion (Burning) Reaction – a
reaction wherein oxygen gas combines
with a hydrocarbon; a compound
containing carbon and hydrogen atoms;
forming carbon dioxide and water as the
products. General equation: CnHn + O2
→ CO2 + H2 O
6. Acid-Base Reaction or Neutralization
Reaction - special kind of double
displacement reaction that takes place
when an acid and a base react. In
general, the products of this reaction are
salt and water. General equation: Acid +
Base → Salt + Water
Directions: Classify the following
unbalanced chemical equations
according to the different types of
reactions. Use the given code below to
classify each reaction.
Code: CR = Combination, DR =
Decomposition ,SRR = Single
Replacement, DRR = Double
Replacement, CoR = Combustion ,ABR
= Acid-Base .
11. O2 + N2 → NO2
1
2. HBr + NaOH → NaBr + H2O
13.
MgI2 + Mn(SO3)2 → MgSO3 + MnI4
14. AgNO3 + Cu → CuNO3 + Ag
15. CaSO4 + Mg(OH)2 → Ca(OH)2 +
MgSO4
16. FeBr3 + Na
→ NaBr + Fe
17. Li + F2 → LiF
18. KClO3 → KCl + O2 19. H2 O →
H2 + O2 20. CaCO3 → CaO + CO2
23. Who was the English scientist who
made accurate observations on the
relationship of pressure and volume? a.
Amedeo Avogadro b. Gay-Lussac c.
Jacques Charles d. Robert Boyle
24. Which of the following is constant
when using the Boyle’s Law? a. energy
b. pressure c. temperature d. volume
25. When pressure on a gas goes
down, what happens to its volume? a.
goes down then rises c. rises then falls
b. rises d. stays the same
26. In the equation for Boyle’s Law, P1
stands for: a. difference in pressure c.
new pressure b. initial pressure d.
standard pressure, 1 atm
27. In the equation for Boyle’s Law, V2
stands for: a. difference in volume c.
initial volume b. final volume d. standard
volume
21. Based on the table, what
relationship can be derived between
pressure (P) and volume (V) at constant
temperature?
a. The volume
is directly proportional to its pressure. b.
The volume is insignificantly related to
its pressure.
c. The volume is
inversely proportional to its pressure.
d. The volume is inversely proportional
to the square of its pressure.
\ 22. Which of the following illustrates
the mathematical statement of Boyle’s
Law?
a. P1V1 = P2V2 b. _____=
T1 V2 T2
c. P1T1 = P2 T2 d.
V1 P1 V2P2 T1 = T2only
In 1787, the French inventor Jacques
Charles, while investigating the inflation
of his manned hydrogen balloon,
discovered that the volume of a gas
varied directly with temperature.
Charles's Law states that the volume of
a given mass of gas varies directly with
the absolute temperature of the gas
when pressure is kept constant. The
temperatures are conventionally
measured in Kelvin, the SI unit of
temperature. Since the volume of a gas
decreases with falling temperature,
scientists realized that a natural zeropoint for temperature could be defined
as the temperature at which the volume
of a gas theoretically becomes zero.
The absolute temperature scale was
devised by the English physicist Kelvin,
so temperatures on this scale are called
Kelvin (K) temperatures. The Kelvin
scale must be used because zero on the
Kelvin scale corresponds to a complete
stoppage of molecular motion.
28Who was the French scientist who
made accurate observations on how
the volume of the gas is related to
temperature? a. Amedeo Avogadro
c. Jacques Charles b. Gay-Lussac d.
Robert Boyle
29. Which of the following is
constant when using the Charles’
Law? a. energy c. temperature b.
pressure d. volume 3. When
temperature of a gas goes down,
what happens to its volume? a. goes
down c. rises b. goes down then
rises d. rises then falls
30.Which of the following quantities
are directly proportional in Charles’
Law? a. number of moles and
volume c. volume and pressure b.
pressure and temperature d. volume
and temperature
31. What is the value of “k” in
Charles’ Law? a. 𝑉� 𝑛� b. 𝑉� 𝑃� c. 𝑉� 𝑇�
d. 𝑉� 𝑉� 7. What temperature scale
must be used when applying
Charles' law? a. Celsius c. Kelvin b.
Fahrenheit d. Both a & b
32. How will you convert Celsius
temperature to Kevin? a. add 273to
Celsius temperature b. divide Celsius
temperature by 273 c. multiply
Celsius temperature and 273 d.
subtract 273from Celsius
temperature
The Kinetic Molecular Theory (KMT)
consists of several postulates. A. A
gas is composed of large number of
particles, either atoms or molecules.
They are so small compared to the
distance separating them that their
own size can be considered
negligible. Compared to the total gas
volume, the particles occupy
negligible volume. A considerable
empty space exists between
particles. B. Gas particles move
randomly in straight line motion and
collide with each other and the
container frequently. The force of
collisions of the gas particles with the
walls of the container causes
pressure. C. Collisions of gas
molecules are perfectly elastic. This
means no energy is lost as friction
when molecules collide. D. Gas
particles exhibit almost negligible
attractions and repulsions for each
other. The molecules thus, move
freely as far as space will allow. E.
The average kinetic energy of gas
molecules is directly proportional to
the absolute temperature (Kelvin). At
the same temperature, the molecules
of all gases will have the same
average kinetic energy
33. How do gas molecules move?
a. constantly and randomly b. in a
circular motion c. in an orderly fashion
d. in straight-line paths
34. Why do gases differ from solids?
a. They can be compressed. b. They
have a definite volume.
c. They have a higher amount of kinetic
energy. d. They have collisions with
close neighbors.
35 Which of the following is true about
most gases?
a. All of the particles are of the same
size. b. They cannot be compressed.
c. They expand to completely fill their
container. d. Their particles are very
close together.
36. Which of the following assumptions
of the kinetic molecular theory of gases
explains that gas molecules after
colliding with one another simply bounce
off in different directions?
a. Gases are made up of tiny particles.
b. Gas molecules move randomly in
different directions.
c. Gas molecules show no attraction for
one another.
d. Gases undergo elastic collisions.
37. Which of the following is the best
place to store compressed gases?
a. areas where there is heat; b.
confined or closed vessel;
c. corridors or stairways; d. secured
areas where there is a proper
ventilation.
38. At which of the following
temperatures will a gas diffuse through a
room most rapidly?
a. 0 ⁰C b. 10 ⁰C c. 20 ⁰C d. 30 ⁰C
39. Last summer vacation, the Cruz
family decided to go to Pagudpod, Ilocos
Norte to have a beach party. On their
way to Ilocos, all of them were surprised
when the tire suddenly exploded. What
is the probable explanation for the
blown-out tire during a long summer
drive?
a. High temperature causes a decrease
in volume.
b. The amount of the gases inside the
tire is increased.
c. The mass of the gases inside the tire
increases causing a blown-up tire.
d. The volume of gases increases as the
temperature increases, causing a blownup tire.
40.Jane can still pump air in the party
balloon even though it is already
inflated. What explains this
phenomenon?