CHEMISTRY HIGH SCHOOL

Who was chosen to lead the Continental Army?A. Charles Cornwallis
B. Henry Knox
C. George Washington
D. Lord Howe

Answers

Answer 1
Answer: George Washington was chosen to lead the Continental Army.

Since Washington was a qualified and professional leader during the French and Indian Wars, they believed that he would make a terrific one for the Continental Army as well. Considering that he was given authority over such a weak and poor army, he somehow handled to force the British out of Boston in 1776 and soon closed the war by having victory at Yorktown in 1781.
Answer 2
Answer: C. George Washington was chosen to lead the Continental Army.
Hope this helps~

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methane and hydrogen sulfide form when hydrogen reacts with carbon disulfide. identify the excess reactant and calculate how much remains after 36 L o fH2 reacts with 12 L of CS2 all at STP

Answers

At STP, 1 mol of gas occupies 22.4 L of volume. Using this conversion we the starting amounts of the reactants:
1.6071 mol H2
.5357 mol CS2
The balanced equation is:
4H2 + CS2 -> CH4 + 2H2S
This means that 4 moles of H2 reacts with 1 mole of CS2.
Multiplying this ratio with each of the amounts of the reactants:
required CS2 based on amount of H2 = 0.4018 mol CS2
required H2 based on amount of CS2 = 2.1428 mol H2
Therefore, the excess reactant is CS2. To calculate how much is left, we simply subtract the amount of the reactant CS2 with the required amount based on the amount of H2:
0.5357 mol - 0.4018 mol = 0.1339 mol 

What are three types of fossil fuels?

Answers

The three types of fossil fuels are coal, oil and natural gas.

Which types of reactions would result in the formation of precipitate?

Answers

Answer:

Double Displacement Reaction

Explanation:

A double displacement reaction is a type of chemical reaction in which the reactant ions exchange places to form new products. Usually, a double displacement reaction results in precipitate formation.

Rank the following structures in order of decreasing electrophilic strength.

Answers

Electrophiles are positively charged or neutral species having empty orbitals that are attracted to an electron rich center. Examples of these are the Bronsted acid. Bronsted acid accepts an electron pair for hydrogen.

Exactly 15.0 g of a substance can be dissolved in 150.0 g of water what is the solubility of the substance in grams per 100 g of water

Answers

The solubility of the substance in grams per 100g of water = 10g

Calculating solubility of water

The solubility of water is the amount of chemical substance that can dissolve to go a solution in the it at a specific temperature.

The quantity of substance given in grams= 15g

This is able to dissolve in water = 150g

Therefore the quantity of the substance that would dissolve in 100g of water = X g

Make X g the subject of formula= 15 × 100/150

= 1500/150

= 10g

Learn more about solubility here:

brainly.com/question/23946616
(15.0 g) / (150.0 g) x (100 g) = 10.0 g/100 g H2O 

How many milliliters of 0.02 M HCl are needed to react completely with 100 mL of 0.01 M NaOH?A) 200 mL
B) 100 mL
C) 75 mL
D) 50 mL
E) 25 mL

Answers

Answer: Option (D) is the correct answer.

Explanation:

Molarity is number of moles divided by volume of the solution.

Mathematically,     Molarity = (no. of moles)/(Volume)

Also, in the given situation number of moles of both HCl and NaOH are equal. Therefore, volume of HCl will be calculated as follows.

               M_(HCl)V_(HCl) = M_(NaOH)V_(NaOH)

               0.02 M * V_(HCl) = 0.01 M * 100 mL

                V_(HCl) = (0.01 M * 100mL)/(0.02)

                                              = 50 mL

Thus, we can conclude that volume of HCl is 50 mL.
The reaction of HCl and NaOH is HCl + NaOH = NaCl + H2O. So the mole number of HCl and NaOH is equal. So the volume of HCl =0.01*0.1/0.02=0.05 L =50 ml. So the answer is D).
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