The tendency of molecules to move toward areas of lower concentration is called ____.
Answer: diffusion
The tendency of molecules to move toward areas of lower concentration is called ____.
Answer: diffusion
Answer: diffusion
A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. What is the partial pressure of oxygen at 101.4 kPa if PHe = 82.5 kPa and PCO2 = 0.4 kPa?
A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. What is the partial pressure of oxygen at 101.4 kPa if PHe = 82.5 kPa and PCO2 = 0.4 kPa?
Answer: 18.5 kPa
If a balloon containing 3000 L of gas at 39°C and 99 kPa rises to an altitude where the pressure is 45.5 kPa and the temperature is 16°C, the volume of the balloon under these new conditions would be calculated using the following conversion factor ratios: ____.
If a balloon containing 3000 L of gas at 39°C and 99 kPa rises to an altitude where the pressure is 45.5 kPa and the temperature is 16°C, the volume of the balloon under these new conditions would be calculated using the following conversion factor ratios: ____.
Answer: 3000 L x (289 / 312) x (99 / 45.5)
A sample of gas occupies 17 mL at -112°C. What volume does the sample occupy at 70°C?
A sample of gas occupies 17 mL at -112°C. What volume does the sample occupy at 70°C?
Answer: 36 mL
A gas occupies a volume of 2.4 L at 14.1 kPa. What volume will the gas occupy at 84.6 kPa?
A gas occupies a volume of 2.4 L at 14.1 kPa. What volume will the gas occupy at 84.6 kPa?
Answer: 0.40 L
As the temperature of a fixed volume of a gas increases, the pressure will ____.
As the temperature of a fixed volume of a gas increases, the pressure will ____.
Answer: increase
Which of the following gases is the best choice for inflating a balloon that must remain inflated for a long period of time?
Which of the following gases is the best choice for inflating a balloon that must remain inflated for a long period of time?
Answer: argon
Which of the following gases will effuse the most rapidly?
Which of the following gases will effuse the most rapidly?
Answer: hydrogen
If the volume of a container of air is reduced by one-half, what happens to the partial pressure of oxygen within the container?
If the volume of a container of air is reduced by one-half, what happens to the partial pressure of oxygen within the container?
Answer: It is doubled.
What happens to the partial pressure of oxygen in a sample of air if the temperature is increased?
What happens to the partial pressure of oxygen in a sample of air if the temperature is increased?
Answer: It increases.
Under what conditions of temperature and pressure is the behavior of real gases most like that of ideal gases?
Under what conditions of temperature and pressure is the behavior of real gases most like that of ideal gases?
Answer: low temperature and high pressure
Which of the following is constant for 1 mole of any ideal gas?
Which of the following is constant for 1 mole of any ideal gas?
Answer: PV / T
Which law can be used to calculate the number of moles of a contained gas?
Which law can be used to calculate the number of moles of a contained gas?
Answer: ideal gas law
At a certain temperature and pressure, 0.20 mol of carbon dioxide has a volume of 3.1 L. A 3.1-L sample of hydrogen at the same temperature and pressure ____.
At a certain temperature and pressure, 0.20 mol of carbon dioxide has a volume of 3.1 L. A 3.1-L sample of hydrogen at the same temperature and pressure ____.
Answer: contains the same number of molecules
What does the ideal gas law allow a scientist to calculate that the other gas laws do not?
What does the ideal gas law allow a scientist to calculate that the other gas laws do not?
Answer: number of moles
The combined gas law relates which of the following?
The combined gas law relates which of the following?
Answer: temperature, pressure, and volume
What happens when a piston is used to decrease the volume of a contained gas?
What happens when a piston is used to decrease the volume of a contained gas?
Answer: Gas particles become compressed.
When the volume and number of particles of a gas are constant, which of the following is also constant?
When the volume and number of particles of a gas are constant, which of the following is also constant?
Answer: the ratio of the pressure and temperature in kelvins
If a balloon is heated, what happens to the pressure of the air inside the balloon if the volume remains constant?
If a balloon is heated, what happens to the pressure of the air inside the balloon if the volume remains constant?
Answer: It increases.
If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant?
If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant?
Answer: It increases.
When the temperature and number of particles of a gas are constant, which of the following is also constant?
When the temperature and number of particles of a gas are constant, which of the following is also constant?
Answer: the product of the pressure and volume
The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change?
The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change?
Answer: It is reduced by one half.
When the Kelvin temperature of an enclosed gas doubles, the particles of the gas ____.
When the Kelvin temperature of an enclosed gas doubles, the particles of the gas ____.
Answer: move faster
Which of these changes would NOT cause an increase in the pressure of a contained gas?
Which of these changes would NOT cause an increase in the pressure of a contained gas?
Answer: The volume of the container is increased.
Why does air escape from a tire when the tire valve is opened?
Why does air escape from a tire when the tire valve is opened?
Answer: The pressure outside the tire is lower than the pressure inside the tire.
If 4 moles of gas are added to a container that already holds 1 mole of gas, how will the pressure change inside the container?
If 4 moles of gas are added to a container that already holds 1 mole of gas, how will the pressure change inside the container?
Answer: The pressure will be five times higher.
What happens to the pressure of a gas inside a container if the temperature of the gas decreases?
What happens to the pressure of a gas inside a container if the temperature of the gas decreases?
Answer: The pressure decreases.
As the temperature of the gas in a balloon decreases, which of the following occurs?
As the temperature of the gas in a balloon decreases, which of the following occurs?
Answer: The volume of the balloon increases.
What happens to the temperature of a gas when it is compressed?
What happens to the temperature of a gas when it is compressed?
Answer: The temperature increases.
If a balloon is squeezed, what happens to the pressure of the gas inside the balloon?
If a balloon is squeezed, what happens to the pressure of the gas inside the balloon?
Answer: It increases.
If the volume of a container of gas is reduced, what will happen to the pressure inside the container?
If the volume of a container of gas is reduced, what will happen to the pressure inside the container?
Answer: The pressure will increase.
Why does the pressure inside a container of gas increase if more gas is added to the container?
Why does the pressure inside a container of gas increase if more gas is added to the container?
Answer: There is an increase in the number of collisions between particles and the walls of the container.
Why is a gas easier to compress than a liquid or a solid?
Why is a gas easier to compress than a liquid or a solid?
Answer: The volume of a gas's particles is small compared to the overall volume of the gas.
If the temperature changes by 100K, by how much does it change in degrees Celsius?
If the temperature changes by 100K, by how much does it change in degrees Celsius?
Answer: 100 Celsius
What is the temperature -34celcius expressed in kelvin?
What is the temperature -34celcius expressed in kelvin?
Answer: 239K
Which temperature scale has no negative temperatures?
Which temperature scale has no negative temperatures?
Answer: Kelvin
What is the temperature scale of absolute zero measured in degrees Celsius?
What is the temperature scale of absolute zero measured in degrees Celsius?
Answer: -273 Celsius
The chief advantage of the metric system over other system of measurement is that it
The chief advantage of the metric system over other system of measurement is that it
Answer: is in multiples of 10
What is the metric system prefix for the quantity 0.000 001?
What is the metric system prefix for the quantity 0.000 001?
Answer: micro-
What quantity is represented by the metric system prefix deci-?
What quantity is represented by the metric system prefix deci-?
Answer: 0.1
What is the volume of a salt crystal measuring 2.44x10-2m by 1.4x10--3. by 8.4x10--3 m?
What is the volume of a salt crystal measuring 2.44x10-2m by 1.4x10--3. by 8.4x10--3 m?
Answer: 2.9x10--7m(3)c
When multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number of significant figures in
When multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number of significant figures in
Answer: The least precise measurement
Express the product of 4.0x10--2 and 8.1x10-2 m using the correct number of significant digits
Express the product of 4.0x10--2 and 8.1x10-2 m using the correct number of significant digits
Answer: 3.2x10-1
What is the measurement 1042L rounded off to two significant digits?
What is the measurement 1042L rounded off to two significant digits?
Answer: 1.0x10-3 L
What is the measurement 111.009mm rounded off to four significant digits?
What is the measurement 111.009mm rounded off to four significant digits?
Answer: 111.0mm
Express the product of 2.2mm and 5.00mm using the correct number of significant digits
Express the product of 2.2mm and 5.00mm using the correct number of significant digits
Answer: 11mm(2)
Express the sum of 7.68m and 5.0m using the correct number of significant digits
Express the sum of 7.68m and 5.0m using the correct number of significant digits
Answer: 12.7m
Express the sum of 1111km and 222km using the correct number of significant digits
Express the sum of 1111km and 222km using the correct number of significant digits
Answer: 1333km
How many significant figures are in the measurement 811.40 grams?
How many significant figures are in the measurement 811.40 grams?
Answer: five
How many significant figures are in the measurement 40,500 mg?
How many significant figures are in the measurement 40,500 mg?
Answer: three
How many significant figures are in the measurement 0.0034 kg?
How many significant figures are in the measurement 0.0034 kg?
Answer: two
In the measurement 0.503 L, which digit is the estimated digit?
In the measurement 0.503 L, which digit is the estimated digit?
Answer: 3
Which of the following measurements is expresses to three significant figures?
Which of the following measurements is expresses to three significant figures?
Answer: 7.30x10--7km
Three different people weigh a standard mass of 2.00g on the same balance. Each person obtains a reading of 7.32g for the mass of the standard. These result imply that the balance that was used is
Three different people weigh a standard mass of 2.00g on the same balance. Each person obtains a reading of 7.32g for the mass of the standard. These result imply that the balance that was used is
Answer: precise
Which group of measurements is the most precise? (Each group of measurements is for a different object.)
Which group of measurements is the most precise? (Each group of measurements is for a different object.)
Answer: 2g, 2.5g, 3g
Which of the following measurements (of different masses) is the most accurate?
Which of the following measurements (of different masses) is the most accurate?
Answer: 3.000000g
When a test instrument is calibrated, does its accuracy, precision, or reliability improve?
When a test instrument is calibrated, does its accuracy, precision, or reliability improve?
Answer: accuracy
Which of the following measurements contains two significant figures?
Which of the following measurements contains two significant figures?
Answer: 0.00044L
The closeness of a measurement to its true value is a measure of its
The closeness of a measurement to its true value is a measure of its
Answer: accuracy
The expression of 5008 km in scientific notation is
The expression of 5008 km in scientific notation is
Answer: 5.008x 10-3 km
The diameter of a carbon atom is 0.000 000 000 154 m. what us this number expressed in scientific notation?
The diameter of a carbon atom is 0.000 000 000 154 m. what us this number expressed in scientific notation?
Answer: 1.54x10-10 m
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