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grandymaker [24]
3 years ago
11

What happens when an electron absorbs energy?

Chemistry
1 answer:
OLga [1]3 years ago
4 0
The correct answer is A I believe
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What is the number of moles of solute in a 0.3 molal solution containing 0.10 kg of solvent? Don't forget the unit.
timurjin [86]
Molality is one way of expressing concentration for solutions. It has units of moles of solute per kg of solvent. From the given values, we easily calculate for the moles of solute by multiplying the mass of solvent to the molality. We do as follows:

moles solute = 0.3 (10) = 3 mol solute


5 0
3 years ago
Read 2 more answers
Phosphine, an extremely poisonous and highly reactive gas, reacts with oxygen gas to form tetraphosphorus decaoxide and water. p
Andreas93 [3]

The molar mass of PH3 is 34 g/mol, therefore the moles is:

moles PH3 = 225 g / (34 g/mol)

moles PH3 = 6.62 mol

 

The balanced equation is:

4PH3(g) + 8O2(g) → P4O10(g) + 6H2O

 

We see that 4 mol of PH3 is required for every mol of P4O10, therefore the number of moles of P4O10 is:

moles P4O10 = 6.62 mol * (1/4)

moles P4O10 = 1.65 mol

 

The molar mass of P4O10 is 283.89 g/mol, so the mass is:

mass P4O10 = 1.65 mol * 283.89 g/mol

mass P4O10 = 469.67 grams ~ 470 grams

8 0
3 years ago
What name is given to substances that resist changes in ph?
nignag [31]
These are buffer systems (solutions of substances) with a steady concentration of hydrogenium ions. At addition to such solution of a small amount of acid or alkali does not change рН.
For example:
CH₃COOH + CH₃COONa    acetate buffer
KH₂PO₄ + K₂HPO₄  potassium phosphate buffer
4 0
3 years ago
Where does oxidation occur in an electrochemical cell?
AlladinOne [14]
Option No. 1 at the cathode in both an electrolytic cell and a voltaic cell

Negative ion arrives at the anode, attracted by electrostatic forces, where they lose electrons. Loss of electrons is defined as oxidation.

The reverse process occur at the negative electrode, where positive ions pick up electrons. They are reduced.
8 0
3 years ago
Read 2 more answers
So anyone know the answer to this
abruzzese [7]

Answer:

Exosphere

Explanation:

it’s the furthest away from the earths surfest which would make it furthest away from earths center.

4 0
3 years ago
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