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3 years ago

How do you think Oxygen can be in the crust when it is a gas at room temperature in the atmosphere?

Chemistry

1 answer:

otez555 [7]3 years ago

5 0

Answer: Through diffusion

Explanation:

Oxygen can be defined as the most abundant element on earth. It is a gas at room temperature. It becomes the part of the earth crust by the process of diffusion.

Diffusion is a process of movement of molecules from a region of high concentration to the low concentration. The oxygen remains in high concentration in the atmosphere diffuses into earth crust at low concentration.

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Is there a way to turn crystallized honey back into liquid honey?

Charra [1.4K]

Yes, you can. If you heat it in the microwave (make sure not to put thin plastic in there, as the plastic will melt), or add hot water (steaming, not boiling) to it, it will turn back into liquid. For the microwave, make sure you have the lid of the honey jar off, and check it every 10-15 seconds in the microwave until it turns back to liquid. Make sure to not put it in there for too long; it will boil over if you heat it too much!

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4 years ago

If a sealed syringe that contains some gas is plunged into cold water, in which direction will the syringe piston slide?

Anton [14]

If the piston is facing towards the bottom of the container holding the cold water, the piston will not move. It will move wherever it is facing.

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4 years ago

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When a student mixes 50 mL of 1.0 M HCl and 50 mL of 1.0 M NaOH in a coffee-cup calorimeter, the temperature of the resultant so

zmey [24]

Answer: 54.4 kJ/mol

Explanation:

First we have to calculate the moles of HCl and NaOH.

$\text{Moles of HCl}=\text{Concentration of HCl}\times \text{Volume of solution}=1.0M\times 0.05=0.05mole$

$\text{Moles of NaOH}=\text{Concentration of NaOH}\times \text{Volume of solution}=1.0\times 0.05L=0.05mole$

The balanced chemical reaction will be,

$HCl+NaOH\rightarrow NaCl+H_2O$

From the balanced reaction we conclude that,

As, 1 mole of HCl neutralizes by 1 mole of NaOH

So, 0.05 mole of HCl neutralizes by 0.05 mole of NaOH

Thus, the number of neutralized moles = 0.05 mole

Now we have to calculate the mass of water:

As we know that the density of water is 1 g/ml. So, the mass of water will be:

The volume of water = $50ml+50ml=100ml$

$\text{Mass of water}=\text{Density of water}\times \text{Volume of water}=1g/ml\times 100ml=100g$

Now we have to calculate the heat absorbed during the reaction.

$q=m\times c\times (T_{final}-T_{initial})$

where,

q = heat absorbed = ?

$c$ = specific heat of water = $4.18J/g^oC$

m = mass of water = 100 g

$T_{final}$ = final temperature of water = $27.5^0C$

$T_{initial}$ = initial temperature of metal = $21.0^0C$

Now put all the given values in the above formula, we get:

$q=100g\times 4.18J/g^oC\times (27.5-21.0)^0C$

$q=2719.6J=2.72kJ$

Thus, the heat released during the neutralization = 2.72 KJ

Now we have to calculate the enthalpy of neutralization per mole of $HCl$ :

0.05 moles of $HCl$ releases heat = 2.72 KJ

1 mole of $HCl$ releases heat = $\frac{2.72}{0.05}\times 1=54.4KJ$

Thus the enthalpy change for the reaction in kJ per mol of HCl is 54.4 kJ

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3 years ago

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All phosphorus (p) atoms have 15 protons in their nucleus. 32p is a radioisotope. how many neutrons does 32p have in it's nucleu

Brut [27]

The correct answer to your question is 17 neutrons.

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Which volcanoes on pasific ring of fire are familiar to you

REY [17]

Answer:

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