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3 years ago

Could somebody please give me an example of some physical properties for any substance?

Chemistry

1 answer:

KIM [24]3 years ago

6 0

Answer:

A physical property is a characteristic of matter that is not associated with a change in its chemical composition. Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity.

Explanation:

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A sample of oxygen gas is collected over water at 25°C and a total pressure of 644 torr. The volume of the gas collected is 500.

Mumz [18]

Answer:

0.544g

Explanation:

To calculate the mass of oxygen collected, we can calculate the number of moles of oxygen collected and multiply this by the molar mass of the oxygen molecule.

To calculate the number of moles of oxygen collected, we can use the ideal gas equation I.e PV = nRT

Rearranging the equation, n =PV/RT

We now identify each of the terms below before substituting and calculating.

n = number of moles, which we are calculating.

R = molar gas constant = 62.64 L.Torr. K^-1. mol^-1

V = volume = 500ml : 1000ml ÷ 1L, hence , 500ml = 500/1000 = 0.5L

T = temperature = 25 degrees Celsius = 273 + 25 = 298K

P = pressure. But since the gas was collected over water, we subtract the vapour pressure of water from the total pressure = 644 - 23.8 =620.2 torr

We substitute these values into the equation to yield the following:

n = (620.2× 0.5) ÷ ( 62.64 × 298)

n = apprx 0.017 moles

To calculate the mass of oxygen collected, we need the molar mass of oxygen. The molecular formula of oxygen is O2, atomic mass of oxygen= 32g/mol

Thus the mass of oxygen collected = 0.017 mole × 32g/mol = 0.544g

8 0

4 years ago

In which orbitals would the valence electrons for selenium (Se) be placed?

RSB [31]

Selenium falls in the same column with oxygen therefore it has the same number of valence electrons with oxygen which is 6. It fills the 3d orbital but only 4s and 4p are counted. The electronic configuration is [Ar]3d^10 4s^2.

8 0

3 years ago

Read 2 more answers

Which pair shares the same empirical formula?

kolezko [41]

Answer: A. $C_2H_2$ and $C_6H_6$

Explanation: Empirical formula is the formula which shows the elements of a compound in the simplest ratio of atoms and not the actual number of atoms as shown in molecular formula.

A) $C_2H_2$ and $C_6H_6$ : Empirical formula for $C_2H_2$ is $CH$ and $C_6H_6$ is $CH$

B) $C_2H_2$ and $C_2H_4$ : Empirical formula for $C_2H_2$ is $CH$ and $C_2H_4$ is $CH_2$

C) $CH_2$ and $C_6H_6$ : Empirical formula for $CH_2$ is $CH_2$ and $C_6H_6$ is $CH$

D) $CH$ and $C_2H_4$ : Empirical formula for $CH$ is $CH$ and $C_2H_4$ is $CH_2$

3 0

3 years ago

The diagram below shows four coastline locations on Earth with respect to the moon at a given time. Moon A B D C In this current

Alexxandr [17]

Answer: Only A

Explanation: The moon controls the tides because of its gravitational pull. The moon's gravitational pull is weaker than Earths that is why the moon's gravitational pull only effectts water on the earth.

5 0

3 years ago

It is expected that US forests will

rosijanka [135]

Answer:

be able to meet long term timber needs.

Explanation:

Forest Services has been indicated for a long time the exhaustion of timer in the United States. However, in the recent decade, this trend has shown a reverse. The creation of nuclear energy and other technological developments that bring about drastic changes in our way of life. Gradually, the forest has recovered its trees and plants, and it is anticipated that timber will be available to meet long-term wood needs.

6 0

3 years ago