Answer:
13) between the nucleus, there is a proton and electron number given, (looking at the periodic table, it gives you the name of the element)
14) an ion, in any element has a POSITIVE charge no matter what.. the numbers depend on what it element the ion is with..
Answer:
They all have about the same vapor pressure.
Explanation:
The elevation of the vapor pressure is related to the elevation of the boiling point: for higher vapor pressure, the liquid will boils at a low temperature.
When a nonvolatile compound is added to the liquid, the boiling temperature increases, in an effect called ebullioscopy, and that difference of temperature can be calculated by:
ΔT = K*W*i
Where K is a constant for the liquid, W is the molality, and i is the van't Hoff factor, which depends on the dissociation of the compound.
i = dissociated particles/total particles
For the molecules compounds given, the ideal van't Hoff factor is 1.
The molality can be calculated by:
W = n1/m2
Where n1 is the number of moles of the solute and m2 is the mass of the solvent. In this case, all the solutes have the same number of moles for the same volume of the solution because they have the same concentration, so the change in temperature is the same for all of them.
Then, they all have about the same vapor pressure.
write an equation to represent the oxidation of an alcohol.
identify the reagents that may be used to oxidize a given alcohol.
identify the specific reagent that is used to oxidize primary alcohols to aldehydes rather than to carboxylic acids.
identify the product formed from the oxidation of a given alcohol with a specified oxidizing agent.
identify the alcohol needed to prepare a given aldehyde, ketone or carboxylic acid by simple oxidation.
write a mechanism for the oxidation of an alcohol using a chromium(VI) reagent.
The reading mentions that pyridinium chlorochromate (PCC) is a milder version of chromic acid that is suitable for converting a primary alcohol into an aldehyde without oxidizing it all the way to a carboxylic acid. This reagent is being replaced in laboratories by Dess‑Martin periodinane (DMP), which has several practical advantages over PCC, such as producing higher yields and requiring less rigorous reaction conditions. DMP is named after Daniel Dess and James Martin, who developed it in 1983.
This page looks at the oxidation of alcohols using acidified sodium or potassium dichromate(VI) solution. This reaction is used to make aldehydes, ketones and carboxylic acids, and as a way of distinguishing between primary, secondary and tertiary alcohols.
Oxidizing the different types of alcohols
The oxidizing agent used in these reactions is normally a solution of sodium or potassium dichromate(VI) acidified with dilute sulfuric acid. If oxidation occurs, the orange solution containing the dichromate(VI) ions is reduced to a green solution containing chromium(III) ions. The electron-half-equation for this reaction is
Cr2O2−7+14H++6e−→2Cr3++7H2O
Answer : The pressure of hydrogen gas is 8.96 atm.
Explanation :
The given balanced chemical reaction is:
From the balanced chemical reaction we conclude that,
As, 2 moles of Al react to give 3 moles of 
gas
So, 4.50 moles of Al react to give 
moles of gas
Now we have to calculate the moles of gas when percent yield is 75.4.
Now we have to calculate the pressure of gas.
Using ideal gas equation :
PV = nRT
where,
P = Pressure of hydrogen gas = ?
V = Volume of the hydrogen gas = 14.0 L
n = number of moles of hydrogen gas = 5.09 moles
R = Gas constant = 
T = Temperature of hydrogen gas = 300 K
Putting values in above equation, we get:
Therefore, the pressure of hydrogen gas is 8.96 atm.
