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4TH PERIODICAL EXAMINATION > Science Part 1 > Flashcards

Science Part 1 Flashcards

Situational Problems and Facts

1
Q
  1. Which example has particles that can be drawn closer to occupy smaller volume?

Fruit juice
Air inside the syringe
Block of wood
Ice cube

A

Air inside the syringe

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2
Q
  1. Which of the following phenomena does NOT involve the application of gas pressure?

Burning fuels
Vulcanizing tire
Falling leaves
Rising hot air balloons

A

Burning fuels

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3
Q

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

A

D. The volume of gases increases as the temperature increases

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4
Q

How can you possibly prove that gases have negligible mass?

A. Put a ballon in a digital balance
before and after you fill it with air.
B. Feel the weight of the samples on both hands.
C. Ask two persons to hold a box filled with air.
D. Support your claim of through equation

A

A. Put a ballon in a digital balance
before and after you fill it with air.

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5
Q

What is pressure?

A

Pressure is the force applied per unit surface area.

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6
Q

What happens to the density of a gas as its volume decreases at a constant pressure and temperature?

A

Increases

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7
Q

What kind of movement is exhibited by gas molecules?

a. Vibrational movement
b. Transitional movement
c. Rotational movement
d. Irrational Movement

A

a. Vibrational movement
b. Transitional movement
c. Rotational movement

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8
Q

How does the temperature affect the average kinetic energy of gas molecules?

A

As the temperature decreases the
average kinetic energy of gas molecules decreases

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9
Q

The temperature of a gas is often expressed which unit?

A

Kelvin

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10
Q

The volume of ammonia is changed 6.1 L. the change occurred when the pressure was changed from 520 mmHg to 790 mmHg. What was the original volume?

A

9.3 L

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11
Q

What gas law states that the volume of a fixed amount of gas is inversely proportional to its pressure at constant temperature?

A

Boyle’s Law

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12
Q

Jane can still pump air in the party balloon even though it is already inflated. What explains this phenomenon?

A

Air molecules can be compressed

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13
Q

What is most likely to happen when an aerosol can is heated?

A

The can will eventually explode

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14
Q

This gas law states that at constant pressure, the volume of a fixed amount of gas is directly proportional to the Kelvin (K) temperature.

A

Charles’ Law

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15
Q

Which of the following expressions relates the kelvin and Celsius temperature scales?

A

K = 273.15 + °C

(273 talag when it comes to solving)

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16
Q

According to the kinetic molecular theory, temperature is directly proportional to

A

Average kinetic energy

17
Q

According to the kinetic-molecular theory, particles of an ideal gas can be?

A

Neither attract nor repel each other but collide.

18
Q

Why does a can collapse when a vacuum pump removes air from the can?

A

The unbalanced outside force from atmospheric pressure crushes the can.

19
Q

How are solids, liquids, and gases different from one another?

A

Their particles have different strengths of attraction.

20
Q

What happens to the volume of a gas if its temperature is increased? Assume that the pressure is constant.

A

Increases

21
Q

A hot air balloon is a real life example of

A

Charles’ Law

22
Q

In Boyle’s law: When _______ is held constant, the pressure and volume of a gas are _______ proportional

A

Temperature, Inversely

23
Q

According to the kinetic-molecular theory, how does a gas expand

A

Its particles move greater distances.

24
Q

According to the kinetic-molecular theory, how gas molecules move?

A

Constant Motion

25
Q

Suppose P, V, and T represent the gas’s pressure, volume, and temperature, then the correct representation of Boyle’s law is

A

V is inversely proportional to P (at constant T)

26
Q

Which of the following statements about bonds and energy is correct?

A

Bond breaking requires energy and bond formation releases bond energy

27
Q

What law states that matter cannot be destroyed or made during a chemical reaction?

A

Law of Conservation of Mass

27
Q

Which of the following is an example of a chemical reaction?

A. The breakdown of food into energy.
B. Metal rusting
C. Photosynthesis in plants
D. Cutting of paper

A

A. The breakdown of food into energy.
B. Metal rusting
C. Photosynthesis in plants

27
Q
  1. Which of the following is TRUE in a balanced equation?

A. The number of atoms per molecule remains the same.
B. The kinds of atom remain the same.
C. The total number of molecules remains the same.
D. The number of atoms of each element remains the same.

A

D. The number of atoms of each element remains the same.

28
Q

In a chemical reaction, what is the relationship between the total mass of the reactants and total must of the products?

A

They must be equal

29
Q

Which of the following statements is NOT true about hat happens in all chemical reactions?

A. The ways in which atoms are joined together are changed.
B. New atoms are formed as products.
C. The starting substances are called reactants.
D. The bonds of the reactants are broken and new bonds of the products are formed.

A

B. New atoms are formed as products.

30
Q

Some chemical reactions require a substance called a catalyst. The main purpose of a catalyst is

A

To speed up the reaction

31
Q

Which chemical reaction always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water

A

Combustion

32
Q

Which of the following statements about collisions is correct?

A. Reaction will occur even without collision of molecules.
B. All colliding particles have the same amount of energy.
C. Only fast-moving particles collide with each other.
D. Reactions can happen if the colliding particles have enough energy

A

D. Reactions can happen if the colliding particles have enough energy

33
Q

Which observation does NOT indicate that a chemical reaction has occurred?

A. formation of precipitate
B. evolution of heat and light
C. production of gas
D. change in the total mass of substances

A

D. change in the total mass of substances

34
Q

Quicklime (CaO) is used as a drying agent. When water is added to this, slaked lime Ca(OH)₂ is formed.

What type of reaction is this?

A

Combination

35
Q

This refers to the number written in the lower right side of the chemical formula that shows the number of atoms of type in the molecules

A

Subscript

4TH PERIODICAL EXAMINATION (6 decks)

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