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61.
What is the BEST reason why the atmospheric

pressure in Baguio city is lower than the atmospheric
pressure at sea level?
a. Because there are more gas particles at higher altitudes.
b. Because there are less gas particles at higher altitudes.
c. Because there are greater temperature at higher altitudes.
d. Because there are lesser temperature at higher altitudes.
ANSWER:
B. Because there are less gas particles at higher altitudes.
-At high altitudes like baguio, the atmospheric pressure is
lower because of lesser gaseous particles above it that
exerts pressure
-At sea level lower than the location of the baguio city there
is higher column of gaseous particles above it that makes
the atmospheric pressure higher
62. Which of the following correctly describe the
process of exhalation (air goes out of the lungs)
a. The lungs decrease in volume, causing the internal
pressure to increase
b.The lungs decrease in volume, causing the internal
pressure to decrease
c. The lungs increase in volume, causing the internal
d.The lungs increase in volume, causing the internal
pressure to decrease
During the process of INHALATION, the lung volume expand
due to the result of the contraction of the diaphragm and
intercostal muscles, thus expanding the thoracic cavity. Due to
this increase in volume, the pressure decreased, based on the
principles of Boyle's law.
ANSWER:
a. The lungs decrease in volume, causing the internal
-As the diaphragm and intercostal muscles relax, the lungs
and thoracic tissues recoil, and the volume of the lungs
decreases. This causes the pressure within the lungs to
increase above that of the atmosphere, causing air to leave
the lungs.
63. The balloon is put into a chamber whose
pressure is less than the atmospheric pressure.
Which balloon diagram corresponds to the given
change in condition?
a. A
b. B
c. C
d. A and B
ANSWER:
c. C
-Balloon C is bigger than the initial balloon
-Pressure is detened by the flow of a mass from a high
pressure region to a low pressure region. Pressure
measurements are made on the fluid states--liquids and
gasses.
Balloon A is smaller than the initial balloon.
Balloon B is the same size as the innitial balloon.
64. The temperature is changed from 50degree
Celsius to 150degree Celsius at constant pressure.
Which balloon diagram corresponds to the given
changed in condition?
a. A
b. B
c. C
d. A and B
Helium is less the tess densed than air.When you increase
the temperature of a gas in balloon, the pressure increases,
but this only serves to stretch the balloon and increase the
volume.
ANSWER:
c. C
65. How is food cooked faster using pressure
cooker?
a. The accumulated steam increases the pressure and
decreases the boiling point of the liquid.
b. The accumulated steam increases the pressure and
increases the boiling point of the liquid.
c.The accumulated steam decreases the pressure and
increases the boiling point of the liquid.
d. The accumulated steam decreases the pressure and
decreases the boiling point of the liquid.
ANSWER:
b. The accumulated steam increases the pressure and increases
the boiling point of the liquid.
-Pressure cooker cooks food faster by increasing the
temperature of boiling water. It does by trapping steam thereby
increasing the pressure on the boiling water.
-Inside a pressure cooker , once the water (liquid) is boiling
and the steam is trapped, the pressure from the steam increases
and pushes on the liquid, which increses its boiling point.
66. Which of the following is NOT a charactiristic
of a base?
a. Bitter taste
b. Slippery feeling
c. Able to change litmus from red to blue
d. Reacts with carbonate to produce carbon dioxide
BASE :
a. Bitter taste-There are very few food materials that are
alkaline but those that are taste bitter.
b.Slippery feeling-Bases denature protein , this accounts
for the 'slippery' feeeling on hands when exposed to base.
Strong bases that dissolved in water well, such as sodium
or potassium lye are very dangerous because of the
structural material of human beings is made of protein.
c. Able to change litmus from red to blue-it is the oldest
one base indicator.
ANSWER:
d. Reacts with carbonate to produce carbon dioxide
-it is a charactiristic of an Acid
67. Which of the following stattements about acid
and base is TRUE?
a. Baking soda is acidic
b. Both acids and bases conduct electricity
c. The concept of H3O+ introduced by Arrhenius
d. The end point is reached when the color of the indicator
in titration changes
a. Baking soda is acidic
-Baking soda is an alkaline subtance.
c. The concept of H3O+ was introduced by Arrhenius
-Arrhenius theory defined an acid is a compound that
increases the concentration of H+ ions form the hydronium
ion (H30+) when they combine with water molecules.
d. The end point is reached when the color of the indicator
in titration changes
-A subtance that changes in color in response to a
chemical change is called INDICATOR
ANSWER:
b. Bases conduct electricity
-Using Arrhenius' definition, acids are those that are produce
the hydrogen ion when dissolved in water while bases produce
the hydroxide ion. These ions, when in water, acts as charge
carriers and can hence conduct electricity.
68. What is the pH of the solution with an [H+] of
1.00×10-¹¹?
a. 1
b. 3
c. 7
d.11
-pH is a measure of how acidic or basic a metal is. Normally
pH runs from 0 to 14.
-The formula for pH is pH=-log[H+]
pH=-LOG10(1.00×10-¹¹)
pH=11
ANSWER:
d. 11
69. Which of the following is the most acidic?
a. Calamansi juice
b. Carbonated drink
c. Urine
d. Vinegar
a. Calamansi juice-it has a pH level of 3 or more likelly 2.5
b. Carbonateed drink-pH range of 2.32 to 5.24 and a mean
value of 3.12
c.Urine-the average value for urine pH is 6.0, but it can
range from 4.5 to 8.0
ANSWER:
d. Vinegar-The pH of vinegar is typically in the range of 2
to 3.5, depending on the concentration of acetic acid.
70. Acid rain is formed when sulfur oxides react with
water in air. It causes lakes and streams decrease in pH
which makes it unable to support fish and plant life.
Which is the LEAST means of solving this problem?
a. Limestone maybe added to the water basins
b. Neutralize sulfur oxides with basics compounds
c. Reduction of sulfur emmisions from the industrial
establishments
d. Providing absorbent colloidal materials to screen acid
rain before hitting the water
b. Neutralize sulfur oxides with basics compounds
-Sulfur oxides emissions cause adverse impacts to vegetation,
including forests and agricultural crops.
c. Reduction of sulfur emmisions from the industrial
establishments
-reducing the sulfur content of fuel is called Benefication. Up to
70% of the sulfur in high-sulfur coils in pyritic or mineral sulfate
form. Coal beneficiation can remove 50% of pyritic sulfur and 20-
30% of total sulfur.
d. Providing absorbent colloidal materials to screen acid rain
before hitting the water
-Colloidal materialas are used to incorporate ational properties
to a solution. Colloidal materials can remain evenly
distributed in the solution without settling to the bottom or
becoming dissolved.
ANSWER
a. Limestone maybe added to the water basins
-Lakes and rivers can have powdered limestone added to
them to neutralize the water-this is callled 'liming'. Liming
however is expensive aits effects are only temporary, it
needs to be continued until the acid rain stops.

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61.

What is the BEST reason why the atmospheric

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