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2 years ago

Question 14 of 25

2 answers:

5 0

A. Areas within an energy level that are occupied by electrons

There are different energy levels where electrons (probably) are, they are hanging out in the orbitals, or energy levels around the nucleus.

We know the other options are wrong because protons are in the nucleus of an atom, neutrons have a neutral charge, and although B sounds right, A is the more accurate choice

algol132 years ago

3 0

Answer:

describes properties characteristic of no more than two electrons in the vicinity of an atomic nucleus or of a system of nuclei as in a molecule

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3 common uses for salt

icang [17]

Answer:

Salt has long been used for flavoring and for preserving food. It has also been used in tanning, dyeing and bleaching, and the production of pottery, soap, and chlorine. Today, it is widely used in the chemical industry.

7 0

2 years ago

Identify the mole ratio of water to sodium metal? Determine the number of moles of Sodium that reacted and determine the number

frozen [14]

Number of moles of sodium reacted is 2 moles. 0.04598 Kg is the mass of sodium that reacted.

Mole fraction is 1 mole ratio is 1:1

Explanation:

Balanced chemical reaction:

2 Na + 2H20 ⇒ 2NaOH + H2 (gas)

atomic mass of sodium = 22.99 g/mol

from the reaction it can be seen that 2 moles of sodium reacted to form 2 moles of sodium hydroxide soluition.

The mass of sodium reacted can be calculated from the formula:

mass = atomic mass of one mole x number of moles

mass = 22.99 x 2

= 45.98 grams is the mass of sodium, to convert it into kilograms it is divided by 1000

= 0.04598 Kg is the mass of sodium that reacted.

Mole fraction formula is:

$\frac{moles of solute}{moles of solution}$ = mole fraction ( solute Na = 2 moles, solution is NaOH =2 moles)

putting the values:

$\frac{2}{2}$

= 1 mole ratio is 1:1

7 0

3 years ago

What species is undergoing reduction in the following reaction? NO3-(aq) + 4Zn(s) + 7OH-(aq) + 6H2O(l) → 4Zn(OH)42-(aq) + NH3(aq

RUDIKE [14]

Zn because it gains electrons

4 0

3 years ago

Choose the correct statement.

nata0808 [166]

Answer:

Explanation:

single displacement replaces one element with another and it's product is a pure element.

4 0

3 years ago

A gas mixture contains rn, he and n2. what is the total pressure of the mixture, if the mole fraction of n2 is 0.350 and the pre

Rufina [12.5K]

We can solve this problem using Raoults law. The formula for Raoults law is:

P_a = X_a * P

where,

P_a = the partial pressure of substance A

X_a = the mole fraction of substance A

P = total pressure

Therefore calculating for P:

P = P_a / X_a

P = 0.580 atm / 0.35

8 0

3 years ago