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4 years ago

If you pump air into cycle tyre a slight warming effect is noticed at valve stem why

1 answer:

6 0

As the air molecules move through the valve they have friction as they hit the walls, and its this friction that causes it to heat up.

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Why is drinking urine unhealthy?<br> whats in it?

Kryger [21]

This is by far probably the best question I've answered all day.
It's not unhealthy to drink it.
Urine consists of 95% water and 5% nutrients

7 0

3 years ago

Read 2 more answers

0.65 moles of O2 originally at 85°C is cooled

soldier1979 [14.2K]

Answer:

2.09 atm

Explanation:

We can solve this problem by using the equation of state for an ideal gas, which relates the pressure, the volume and the temperature of an ideal gas:

$pV=nRT$

where

p is the pressure of the gas

V is its volume

n is the number of moles

R is the gas constant

T is the absolute temperature

In this problem we have:

n = 0.65 mol is the number of moles of the gas

V = 8.0 L is the final volume of the gas

$T=40C+273=313 K$ is the temperature of the gas

$R=0.082 atm L mol^{-1} K^{-1}$ is the gas constant

Solving for p, we find the final pressure of the gas:

$p=\frac{nRT}{V}=\frac{(0.65)(0.082)(313)}{8.0}=2.09 atm$

8 0

4 years ago

The four major attractive forces between particles are ionic bonds, dipole-dipole attractions, hydrogen bonds, and dispersion fo

natima [27]

Answer with Explanation:

Ionic bond:It is that type of bond which formed between negative and positive ions.

Hydrogen bonding:Hydrogen bonding formed between hydrogen and high electronegative elements.

Dispersion force:It is weakest intermolecular force.It is temporary attractive force.When electrons of two adjacent atoms occupy positions that make the atoms temporary dipoles.

NaCl: In which Na is positive ion and Cl is negative ion.

Therefore, NaCl is ionic.

HF:F is highest electronegativ elements.

HF:Hydrogen bonding

HCl: Hydrogen bonding

$F_2$ :Dispersion

4 0

3 years ago

6. A fellow chemist in your research group made 2.4 moles of gas held at a

Whitepunk [10]

Ignore this its not the anwser 2.7g

7 0

3 years ago

If you hadn't added quite enough hydrochloric acid to consume all the magnesium metal, what would be the effect of this error on

sweet-ann [11.9K]

If enough HCl is not added, the percent yield will be lower as all the magnesium metal has not reacted with HCl.

<h3>What is percent yield of a reaction?</h3>

The percent yield of a reaction is the ratio of the actual yield and the expected yield expressed as a percentage.

Percent yield = actual yield/expected yield × 100%

The reaction between magnesium metal and HCl liberates hydrogen gas and forms magnesium chloride salt.

If enough HCl was not added to react with all the magnesium metal, the actual yield will be lower.

Hence, percent yield will be lower as well.

Therefore, the percent yield will be lower if all the magnesium metal has not reacted with HCl.

Learn more about percent yield at: brainly.com/question/10046114

8 0

2 years ago