I REALLY NEED HELP WITH THIS CHEMESTRY PROJECT. I DO NOT UNDERSTAND ANYTHING OF THIS. CAN YOU GUYS PLZ HELP ME?Problem:
You and your team work at Southern Nevada Water Authority and have been given the job of managing fluoride levels for the municipal water system. Today, you will need to measure the mass of the mineral sample fluorite (chemically, CaF2). Use this sample to determine how much water must be added to yield a 1 ppm fluoride solution. Your supervisor is requesting tanker trucks to bring the excess water. He needs to know how many tanker trucks to request and the total cost.

Notes: 1 mol CaF2 = 78.08 g CaF2 = 6.02 x 1023 molecules of CaF2
1 molecules of CaF2 = 2 atoms of F
1 mol H2O = 18 g H2O Density of water is 1 g/mL
1000 mL = 1 L and 3.78 L = 1 gallon
mass of sample of CaF2 = 287.185 g
1 part per million = 1 atom of fluorine per 999,999 water molecules.
1 truck can carry 12,800 litters of water at a cost of $2,852.42 dollars.


Before you begin mixing a solution of fluorite and water your team must first calculate the amount of water you will need. Your team will create a presentation that will show all of the necessary calculations to ensure that the greater Las Vegas area will have cavity free teeth. The presentation should include the following information:
- Draw a diagram that points out the basic design of the water system and transport.
- Demonstrate the following calculations
(a) Calculate how many moles of mineral fluorite (CaF2) are in you sample.
(b) Calculate the number of fluorine atoms in the sample of the mineral fluorite (CaF2).
(b) Calculate how many molecules of water you will need.
(c) Calculate the number of gallons of water that are needed to dissolve a 287.185 gram sample of fluorite to yield 1ppm solution.
(e) How many trucks will be needed? Show your calculations!
(f) what is will be the total cost?

- Bonus points for creativity or “WOW” factor (i.e. pictures, color, neatness)!

Answer:

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Explanation:

Answer:

it would be OA that is negatively charged

Answer: C

Explanation:

This is basic stoichiometry

4.5 X 10^20 Atoms x (1 mole/ 6.02 X 10^23 atoms) = 7.48 X 10^-4 moles Ag

so the answer would be C.

Answer:

Specific heat capacity

Explanation:

Heat capacity is defined as amount of the heat supplied or absorbed by the given mass of the material so to make a unit change in the material's temperature.

The SI unit is Joule / kelvin (J/K).

It is an extensive property.  

While,  

Specific heat capacity is the amount of heat absorbed or lost by one gram of mass of the substance to raise it's temperature by 1°C or 1 K

It is an intensive property.

Answer: The first ionization energy for the first five elements of Group 15 decreases.

Explanation:

Ionization energy is defined as the energy required to remove an electron from the outermost shell of an isolated gaseous atom. It is represented as

Ionization energy decreases as we move down the group. This happens because the number of shells increases as we move down the group. The electrons are added in the new shell around the nucleus.

This results in the shielding of outermost electrons more from the inner ones, which decreases the attraction between the outermost electrons and the nucleus. Hence, the removal of electron from the outermost shell becomes easy and requires less energy.

Hence, the first ionization energy for the first five elements of Group 15 decreases.