Solid samples of the element phosphorus can be white, black, or red in color. The variations in color are due to different(1) atomic masses
(2) molecular structures
(3) ionization energies
(4) nuclear charges
Answers
Answer:
Due to molecular structures.
Explanation:
The different forms of phosphorus (white, black or red) are allotropes of phosphorus.
They differ in molecular structures.
White phosphorus: It has four phosphorus which form a tetrahedral shape.
Black phosphorus : It has orthorhombic structure and due to interlinked six membered rings, it is least reactive.
Red phosphorus: It is formed on heating white phosphorus. It is initially amorphus and turns crystalline on further heating.
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Na2CO3 + Ca(OH)2 --> 2NaOH + CaCO3
Now I know how to do equations like this, just a bit confused on how to use my conversion factors.
Do I need to use the 3.0 Molarity in this equation or can I just use Molar Volume of a gas (22.4L/1 mole)?
Answers
You would have to use the molarity of calcium hydroxide to find the moles of calcium hydroxide. Once you have moles, just convert using mole:mole ratio and find the grams of sodium hydroxide.
Answers
Answers
Answer:
The heat of vaporization relates the amount of heat required to transform a certain phase of a certain amount of substance from liquid to gas. The heat of vaporization of substances can be expressed in terms of joules per gram or joules per mole.
ExplanaDetermine the total amount of heat, q, that is required to evaporate the given amount of water at its boiling point. For this problem, we simply apply the equation,q
=
m
Δ
H
v
a
p
where m is the mass and
Δ
H
v
a
p
is the enthalpy of vaporization of water. We use the following values:
m
=
100
g
Δ
H
v
a
p
=
2.26
k
J
/
g
We proceed with the solution.
q
=
m
Δ
H
v
a
p
=
(
100
g
)
(
2.26
k
J
/
g
)
=
226 k
j tion:
B. a decrease in greenhouse gases
C. average decrease in the temperatures near Earth's surface
D. a decrease in carbon dioxide emissions
Answers
Answer: The correct answer is A. average increase in the temperatures near Earth's surface
Explanation: The reason this is correct is that global warming is it getting hotter, logically the temperatures near Earth's surface will be getting hotter as well. Hope this helps
B. The solute dissolves.
C. The solute remains intact.
D. The solute reacts to form a precipitate.
Answers
Answer: Option (B) is the correct answer.
Explanation:
An ionic solid is a substance which has ionic bonds, that is, formed by the transfer of electrons.
Ionic bonds have strong force of attraction because ionic solids have opposite charges which strongly attract each other.
When we dissolve ionic solid in a beaker of water, it completely dissociate into its ions because polar molecules or solutes dissolve in polar solvents.
For example, when NaCl is dissociated into ions then the reaction is as follows.
Thus, we can conclude that when an ionic solid is placed in a beaker of water then the solute dissolves in it.