Answer:
Explanation:
1 ) Which of these is a unit of pressure?
Answer:
Option B = I and II
Torr and mmHg both are units of pressure.
While litter (L) is unit of volume.
Torr:
Torr is the measure of pressure produced by one mmHg equal to the 1/760 of standard pressure used to the pressure of vacuum system.
Millimeter mercury mmHg:
It is the manometric pressure unit. It is defined as, the pressure exerted by column of mercury one millimeter high. it is represented by mmHg.
Torr to mmHg conversion:
Both are equal to each other.
1 torr = 1 mmHg
Torr to atm:
Torr is converted into atm by dividing the torr value 760.
mmHg to atm.
mmHg is converted into atm by dividing the torr value 760.
2) Decreasing the temperature of a gas will....
Answer:
option B = Decrease the collision rate between gas particles
when the temperature of gas is increased the average kinetic energy of gas molecules will increased and gas particles moves fast. Thus because of high velocity gas molecules colloid with each other and also with the wall of container. We can say that collision between gas molecules increased by increasing the temperature. The pressure will also goes to increase.
But when the temperature is decreased the kinetic energy of gas molecules goes to decrease and collision will also decreased because of smaller velocity of gas molecules.
3) Which of the following pressure is equal to 2.0 atm.
Answer:
B) 202.6 KPa
In order to convert the pascal to atm we will divide the given value by 101325.
In order to convert the KPa into atm we will divide the value by 101.325.
A) 202.6 pa
202.6/101325
0.002 atm
B) 202.6 KPa
202.6/101.325
2 atm
C) 202,600 kpa
202,600/101.325
1999.5 atm
D) 202,600 Pa
202,600/101325
1.9995 atm
The option b is correct because 202.6 Kpa is equal to 2.0 atm.
4) What is the correct calculation when converting the 4.1 atm to kilopascal?
Answer:
Kilopascal and atm both are units of pressure. They can be converted into one another.
KPa can be converted into atm by dividing the giving KPa value 101.325.
atm can be converted into KPa by multiplying the given atm value with 101.325.
For example:
4.1 atm × 101.325 kpa/ 1 atm
415.432 atm. kpa / 1atm
415.432 kpa
Kpa to atm:
415.432 kpa/101.325 kpa × 1 atm
4.1 × 1 atm
4.1 atm
5) Decreasing the temperature of gas decreases the pressure because
Answer:
option b= The collision rate between gas particles decreased.
when the temperature of gas is increased the average kinetic energy of gas molecules will increased and gas particles moves fast. Thus because of high velocity gas molecules colloid with each other and also with the wall of container. We can say that collision between gas molecules increased by increasing the temperature. The pressure will also goes to increase.
But when the temperature is decreased the kinetic energy of gas molecules goes to decrease and collision will also decreased because of smaller velocity of gas molecules. Thus slow moving particles exerted low pressure.
Temperature and pressure are also directly related to each other. When temperature is high pressure will also high and when temperature is low pressure will also low.
6) Which of these is a unit of pressure?
KPa
Torr
g
Answer:
option B = I and ii
Explanation:
Kpa and torr both are pressure units.
Gram (g) is the unit of mass.
Torr:
Torr is the measure of pressure produced by one mmHg equal to the 1/760 of standard pressure used to the pressure of vacuum system.
Kilopascal:
The kilopascal is the unit of pressure. It is represented by KPa.
it is the pressure generated by 10 g mass of substance on area of 1 cm².
There are 1000 pascal in one kilopasca.
one atm = 101.325 KPa
one atm = 101325 Pa
7) How many mmHg is 2.64 atmosphere equivalent to ?
2.01 × 10³ mmHg
3.47 × 10⁻³ mmHg
2.88 × 10² mmHg
2.64 mmHg
Answer:
A) 2.0× 10³ mmHg
Explanation:
Millimeter mercury mmHg:
It is the manometric pressure unit. It is defined as, the pressure exerted by column of mercury one millimeter high. it is represented by mmHg.
mmHg to atm.
mmHg is converted into atm by dividing the torr value 760.
atm to mmHg
atm is converted into mmHg by multiplying the given value with 760.
2.64 atm × 760 mmHg / 1 atm
2006.4 mmHg .atm /1 atm
2.0× 10³ mmHg .atm /1 atm
2.0× 10³ mmHg
8) Which of these quantities are equal to 303900 Pa?
303.9 atm
3.0 atm
44.1 psi
1520 mmHg
Answer:
option b = 3.0 atm
it is almost equal to 303,900 Pa but not exactly. because
3.0 atm = 303975 Pa
Explanation:
A) 1 atm = 101325 Pa
303.9 atm × 101325 Pa / 1 atm
30792667.5 Pa .atm / 1 atm
30792667.5 Pa
b) 3.0 atm
3.0 atm × 101325 Pa / 1 atm
303975 Pa .atm / 1 atm
303975 Pa
C) 44.1 Psi
44.1 × 6894.757
304058.8 Pa
D) 1520 mmHg
1520 × 133.322
202650 Pa
B. 0.588 mol Ba
C. 68.4 mil Xe
D. 1.57 mol S
Answer:
Mass (m) = Number of moles(n) × Molar mass (M)
A. 6.65 mol W
M (W) = 184 g/mol
n = 6.65mol
mass of W = 6.65 × 184 = 1223.6g
B. 0.588 mol Ba
M(Ba) = 137g/mol
n = 0.588 mol
mass of Ba = 0.588 × 137 = 80.556g
C. 68.4 mol Xe
M(Xe) = 131g/mol
n = 68.4 mol
mass of Xe = 68.4 × 131 = 8960.4g
D. 1.57 mol S
M(S) = 32.1 g/mol
n= 1.57 mol
mass of S = 1.57 × 32.1 = 50.397g
Hope this helps
Molar mass is used to calculate the mass of an elemental sample. For the elements Tungsten (W), Barium (Ba), Xenon (Xe), and Sulphur (S), the masses are 1221.53 grams, 80.7 grams, 8982.216 grams, and 50.35 grams respectively.
The mass of an elemental sample can be calculated by multiplying the number of moles by the molar mass of the element. Molar mass, measured in grams/mole, represents the mass of one mole of a given substance.
#SPJ3
Answer:
Clouds generally form within the troposphere.
Explanation:
A cloud is a mass of water droplets, ice crystals or both at the same time, which remains in suspension in the atmosphere, and whose formation is due to the condensation of water vapor in the sky.
Clouds form when the air is saturated and can no longer contain water vapor, this can happen in two ways:
1. The amount of water in the air has increased.
2. The air cools to its dew point.
Clouds generally form within the troposphere.
B)protons and neutrons.
C)protons and electrons.
D)protons, neutrons, and electrons.
Answer:
B)protons and neutrons.
Answer:
The correc answer is C. greenhouse gases.
Explanation:
The atmosphere is a layer of gases that surrounds our planet and is one of the essential elements for life on it.
The atmosphere protects us from harmful solar radiation from the Sun. The Sun, in addition to light and heat (infrared radiation), emits other radiation such as gamma rays, X-rays and ultraviolet rays that are harmful to life. These harmful radiations are absorbed by the atmosphere.
The atmosphere also protects us from the impacts of meteorites. These are from outer space are attracted by gravity and fall on the earth's surface. Upon coming into contact with the gases of the atmosphere, at high speed, the friction causes them to heat up so much that they become incandescent and end up disintegrating, avoiding reaching the ground. Only the largest (rare) can pass through the atmosphere and reach the ground.
Something similar happens that with meteorites occurs with the dangerous particles of space.
Greenhouse gases contribute, to a greater or lesser extent, to the increase of the greenhouse effect, since they are capable of absorbing the heat energy carried by long-wave radiations that are reflected by the Earth's surface.This phenomenon prevents the solar energy constantly received by the Earth from returning immediately to space and causing the temperature of the air near the ground to rise. Then there are changes in the climate such as sea level rise, changes in rainfall, disappearance of forests, extinction of organisms and problems for agriculture.
So the correc answer is C. greenhouse gases.