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3 years ago

A decrease in height of a column in a mercury barometer means that

Chemistry

1 answer:

insens350 [35]3 years ago

5 0

Answer:

increase in the air pressure

Explanation:

The barometer is a device that is used for measuring the air pressure. It is a device that uses mercury in order to show the air pressure. The mercury reacts easily to the changes in the air pressure, so it is a nice indicator for it. The air pressure can simply be defined as the weight of the air masses, and the pressure they make it because of it on the objects. The lower the air pressure, the higher up the mercury will go, as it will experience less pressure from the air, and the higher the air pressure, the lower the mercury will drop, as it will experience more pressure from the air.

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3. What is the atomic mass of phosphorous if phosphorous-29 has a percent abundance of 35.5%, phosphorous-30 has a percent abund

daser333 [38]

Answer:

The atomic mass of phosphorus is 29.864 amu.

Explanation:

Given data:

Atomic mass of phosphorus = ?

Percent abundance of P-29 = 35.5%

percent abundance of P-30 = 42.6%

Percent abundance of P-31 = 21.9%

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass / 100

Average atomic mass = (29×35.5)+(30×42.6) + (31×21.9) /100

Average atomic mass = 1029.5 + 1278 + 678.9/ 100

Average atomic mass = 2986.4 / 100

Average atomic mass = 29.864 amu.

The atomic mass of phosphorus is 29.864 amu.

5 0

3 years ago

True or false climatologist use weather balloon stethoscope and satellite

Alona [7]

False I think because they don't use balloons to check the weather

5 0

3 years ago

Read 2 more answers

Two sealed, rigid 5.0L containers each contain a gas at the same temperature but at a different pressure, as shown above. Also s

Elodia [21]

Answer:

The question with options are

Two sealed, rigid 5.0L containers each contain a gas at the same temperature but at a different pressure, as shown above. Also shown are the results of transferring the entire contents of container 1 to container 2. No gases escape during the transfer. Assuming ideal behavior, which statement is correct regarding the total pressure of the gases after they are combined?

A) The total pressure of the gases in the mixture is the sum of the initial pressures of oxygen gas and nitrogen gas because pressure only depends on the total amount of gas when volume and temperature are held constant.

B) The total pressure of the gases in the mixture is lower than the sum of the initial pressures of oxygen and nitrogen because some of the energy of the particles will be lost due to an increase in the number of collisions.

C) The total pressure of the gases in the mixture is higher than the sum of the initial pressures of oxygen and nitrogen because of the inter molecular forces that develop between oxygen and nitrogen molecules.

D) The total pressure of the gases in the mixture cannot be determined because the actual value of the temperature is not given.

The correct answer to the question is (A), a representation of Dalton's Law of Partial pressure

Explanation:

The above solution can be explained by Dalton's law of partial pressures which states that at constant temperature and pressure, the pressure of a given mass gas is equal to the sum of the partial pressures of the individual gases that make up the mixture :

$P_{Total}$ = $P_{gas in container 1}$ + $P_{gas in container 2}$

The partial pressure of a gas is the pressure exerted by the gas if the gas is the only constituent of the container

Dalton's Law is used to

Calculate the gas partial pressure given the mole ratio and total pressure

Determine the number of moles of a gas present in a mixture given the partial pressure and total pressure

Calculate the pressure exerted by a mixture of gases given the partial pressures of the individual gases at constant temperature and pressure

7 0

3 years ago

General properties of matter include all but which of the following.

nevsk [136]

General properties of matrer include all but color. Mass, density and Volume are tbe intensive properties of matter.

4 0

3 years ago

Read 2 more answers

When alkali metals are heated in an excess of oxygen, the primary product formed depends on the metal itself. Match the metal wi

stealth61 [152]

Answer:

Li = M₂O

Na = M₂O₂

K = MO₂

Rb = MO₂

Cs = MO₂

Explanation:

Since the reactivity of alkali metals increases on moving down the group with the increase in atomic size, their reactivity towards oxygen increases on going down the from lithium to caesium.

Lithium being the least reactive reacts with oxygen in the air to give white lithium oxide, LiO₂.

Sodium reacts with excess oxygen when heated to form sodium peroxide, Na₂O₂

Potassium reacts with excess oxygen when heated to form potassium superoxide, KO₂

Rubidium reacts with excess oxygen when heated to form rubidium suproxide, RbO₂

Caesium reacts with excess oxygen when heated to form caesium superoxide, CsO₂

4 0

3 years ago