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emmainna [20.7K]
4 years ago
13

Why is it so difficult to obtain pure water

Chemistry
1 answer:
kodGreya [7K]4 years ago
6 0
One big reason is that farmers use lot's of chemicals for their plants to grow and those chemicals can get into drinkable water. Another reason is that almost 96.5% of earth's water is salt water which is really undrinkable. Hope this helped you! :D
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A 0.1375-g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 3024 J/°C. The
Anna35 [415]

Answer:

-24.76 kJ/g; -601.8 kJ/mol

Explanation:

There are two heat flows in this experiment.

Heat from reaction + heat absorbed by calorimeter = 0

             q1                +                     q2                         = 0

           mΔH             +                    CΔT                        = 0

Data:

m = 0.1375 g

C = 3024 J/°C

ΔT = 1.126 °C

Calculations:

0.1375ΔH + 3024 × 1.126 = 0

           0.1375ΔH + 3405 = 0

                        0.1375ΔH = -3405

                                   ΔH = -24 760 J/g = -24.76 kJ/g

ΔH = -24.76 kJ/g ×24.30 g/mol = -601.8 kJ/mol

3 0
3 years ago
Which of the following is a compound machine?
Burka [1]
A compound machine is that which is composed of two or more simple machines. Simple machines come in 6 basic types: (1) wheel and axle, (2) inclined plane, (3) wedge, (4) pulley, (5) screw, and (6) lever. Among the choices given above, the compound machine is the can opener for it is a combination of a wedge and a lever. 
3 0
4 years ago
Which of the following actions demonstrates compression of a gas? exhaling air from your lungs lighting a fire turning on an ele
wariber [46]
Exhaling air from your lungs
5 0
3 years ago
Read 2 more answers
Answer Quick
kow [346]

Answer:

20.9%

Explanation:

  • The percentage by mass of solution is given by dividing the mass of solute in grams by the mass of solution in grams then multiplying it by 100%.

% Mass of solution = mass of solute/mass of solution × 100%

                               = (27.0 g/ 129.0 g) × 100%

                               = 20.93%

                               = 20.9%

7 0
3 years ago
Read 2 more answers
The natural abundance of 3he is 0.000137 %. how many protons, neutrons, and electrons are in an atom of 3he?
jok3333 [9.3K]
2 protons+, 1 neutron, and 2electrons-
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4 years ago
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