If you look at the periodic table you’ll noticed a trend. Group one, sometimes called 1A, has hydrogen in it, it’s group (column) has a positive charge. The group (column) next to it Group 2 sometimes called 2A has twice the charge as group 1. Then you skip the transition metals, and then land on group (column) 13. These guys have a charge of +3 typically. Then you have group 14, sometimes called 4A, and it’s weird and it kind of breaks with this trend. Then you have group (column) 15 next to it, sometime called 5A, which now starts to count down in charge, it has a charge of -3.
And each group (column) after that countdown to zero charge, once you have zero charge you know that you’re in the noble gases.
So, nitrogen in group (column) 15, also know as column 5A. This column has for the most part a charge of -3.
Aluminum is in group (column) 13, they have a charge of +3 typically.
I hope that helps.
Answer:
grams of iron = 2262.4 g
Explanation:
The balanced chemical equation should be represented first.
2Al + Fe2O3 → Al2O3 + 2Fe
find the limiting reactants by converting to moles.
covert 1.64 kg to grams = 1640 g
moles = mass/molar mass = 1640/27 = 60.7407407407 moles
60.7407407407 × 1 mol-rxn /2 = 30.37 mol-rxn
The limiting reactant is Fe2O3 Therefore it will determine the yield of Iron
2Al + Fe2O3 → Al2O3 + 2Fe
molar mass of Fe2O3 = 56 × 2 + 16 × 3 = 112 + 48 = 160
g
atomic mass of iron = 56
mass of iron in the reaction = 56 × 2 = 112 g
moles = mass/molar mass
mass = moles × molar mass
mass = 20.2 × 160 = 3232 g
if 160 g of Fe2O3 give 112 g of iron
3232
g of Fe2O3 will give ? grams of iron
grams of iron = 3232 × 112/ 160
grams of iron = 361984
/160
grams of iron = 2262.4 g
Answer:
C. Hydrogen Ions.
Explanation:
The pH level of soils is measured based upon the acidity or basicity level in the soil. The pH scale usually measures between 0-14. 7 is the neutral pH level of soil and a pH level below 7 is considered acidic and above 7 is alkaline.
So, soil with a high amount of hydrogen ions (H+) will be considered acidic. As the amount of hydrogen ions increases in the soil, the pH level of the soil decreases, making it acidic.
Therefore, option C is correct.
The absorption spectrum is the result of absorption of light radiation by a material (solid or liquid) as a function of wavelength or frequency. The figure is shown below:
Answer : The amount of heat absorbed are, 258485.5 J
Solution :
Formula used :
where,
Q = heat gained = ?
m = mass of water = 650 g
c = specific heat of water = 
= final temperature = 
= initial temperature = 
Now put all the given values in the above formula, we get the final temperature of copper.
Therefore, the amount of heat absorbed are, 258485.5 J
