CHEMISTRY MIDDLE SCHOOL

If you added 15,000 calories to 2.0 L of water that was at 25.0 degrees C, what temperature would it be at when you finished?

Answers

Answer 1
Answer:

Answer:

When we finish, the temperature would be 32.5℃

Explanation:

Density of water = mass/volume

So,

Mass of water = Density × Volume

where

= Final T - Initial T

Q is the heat energy in calories

c is the specific heat capacity (for water 1.0  cal/(g℃))  

m is the mass of water

plugging in the values  

Final T = ∆T + Initial T

= 7.5℃ + 25℃ = 32.5℃ (Answer).


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MIDDLE SCHOOL

4 FeCl3 + 3O2 --> 2Fe2O3 + 6Cl2 balance this please
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Answers

Answer:

FeCl3 + O2 = Fe2O3 + Cl2

Explanation:

HIGH SCHOOL

Convert 1.00atm of pressure to its equivalent in millimeters of mercury.

Answers

Standard sea-level atmospheric pressure is 760 mm Hg.
MIDDLE SCHOOL

How many grams of AgCl will be produced from 5.00 g of NaCl and 103 g of AgNO3?
grams

Answers

Answer:

12.3 g.

Explanation:

Whenever a similar problem is involved, we need to write the chemical reaction representing the net change, as well as due to the fact that we need to know the stoichiometry involved.

Sodium chloride reacts with silver nitrate in a double displacement reaction to produce a cation exchange, that is, we produce silver chloride and sodium nitrate given by the following balanced chemical equation:

According to the balanced chemical equation, the molar stoichiometry of silver nitrate to sodium chloride is 1 : 1.

Let's find moles of each substance to determine the limiting reactant. To do this, divide mass of each component by its molar mass:

Since the stoichiometry of this reaction is 1 : 1, we can compare the moles directly. Notice that the number of moles of NaCl is lower than the number of moles of silver nitrate. This means NaCl is the limiting reactant.

According to the balanced chemical equation, 1 mole of NaCl produces 1 mole of AgCl, so the amount of AgCl would be:

In order to convert this into mass, let's multiply by the molar mass of AgCl:

HIGH SCHOOL

Scientists use this technology to map the human genome.

Answers

Answer:

DNA

Explanation:

Human genome mapping is the scientific research that helps in determining the set of nucleic acid sequence of humans which make up human DNA. This exercise have many advantages such as:

  1. It can help in identifying health hazards.
  2. It can help people in living better life.
  3. It can help in development of new treatments.
  4. It can help doctors to practice preventative medicine.
Scientists would usually use DNA to find human genome 
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