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4 years ago

When salt is placed on ice the ice melts explain why?

Chemistry

2 answers:

s344n2d4d5 [400]4 years ago

8 0

The salt helps lowering freezing point and/or melting point of water.

jekas [21]4 years ago

5 0

Answer: The addition of salt in ice particles causes a decrease on its freezing point.

Explanation: salt definitely lowers the freezing point of ice particles.

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An intravenous infusion is to contain 15 mEq of potassium ion and 20 mEq of sodium ion in 500 mL of 5% dextrose injection. Using

Studentka2010 [4]

Answer:

To supply the required ions it is necessary to inject 5,6mL of 6g/30mL solution and 131,1 mL of 0,9% solution.

Explanation:

1mEq of sodium are 59mg of NaCl and 1mEq of potassium are 75mg KCl

in intravenous infusion 15 mEq of K are:

15x75mg KCl = 1,125g of KCl

And 20 mEq of Na are:

20x59mg NaCl = 1,18g of NaCl

To supply the potassium ion it is necessary to inject:

1,125g of KCl× $\frac{30mL}{6g}$ = 5,6mL of 6g/30mL solution

And, to supply the sodium ion it is necessary to inject:

1,18g of NaCl× $\frac{100mL}{0,9g}$ = 131,1 mL of 0,9% solution

I hope it helps!

6 0

4 years ago

3. The molar heat of solution for ammonium nitrate (NH 4 NO 3 ) is 25.7 kJ/mol.

Karo-lina-s [1.5K]

Answer:

3.42 moles

Explanation:

By the law of conservation of energy, assuming no losses of heat to the surroundings, the amount of heat consumed by the dissolution of the ammonium nitrate is equal to the amount of heat released from the water. This is, the ammonium nitrate absorbs all the heat it needs to break the ions apart and get dissolved from the water in which it is being dissolved.

Thus:

88.0kJ = n × 25.7 kJ/mol

↑ ↑ ↑

heat released number of moles molar heat of solution

from water of NH₄NO₃ for NH₄NO₃

Solve for n and compute:

n = 88.0kJ / (25.7kJ/mol) = 3.42 moles ← answer

7 0

3 years ago

How does sand cause weathering?

Ivahew [28]

Sand doesn't directly cause weathering because sand is made via weathering. When rocks get weathered they become sand. But maybe when the sand and wind work together they might be able to weather some rocks

6 0

4 years ago

Read 2 more answers

how many grams of calcium oxide are producer from the decomposition of 125 grams of calcium carbonate

Dmitrij [34]

70.0 g. The decomposition of 125 g CaCO3 produces 700 g CaO.

MM = 100.09 56.08

CaCO3 → CaO + CO2

Mass 125 g

a) Moles of CaCO3 = 125 g CaCO3 x (1 mol CaCO3/100.09 g CaCO3)

= 1.249 mol CaCO3

b) Moles of CaO = 1.249 mol CaCO3 x (1 mol CaO/1 mol CaCO3)

= 1.249 mol CaO

c) Mass of CaO = 1.249 mol CaO x (56.08 g CaO/1 mol CaO) = 70.0 g

7 0

4 years ago

The input force of a pulley system must move 8.0 m to lift a 3000-N engine a distance of 2.0 m. What is the IMA of the system?

Maslowich

To overcome a friction, certain amount of input force is needed, and actual mechanical advantage is difficult to be calculated thus, ideal mechanical advantage or IMA is calculated by taking ratio of input distance and output distance. It is mathematically represented as:

$IMA=\frac{d_{i}}{d_{o}}$

Here, $d_{i}$ is input distance and $d_{o}$ is output distance.

In the problem, input distance is 8 m and output distance is 2 m thus,

$IMA=\frac{d_{i}}{d_{o}}=\frac{8 m}{2 m}=4$

Therefore, ideal mechanical advantage or IMA is 4.

4 0

3 years ago

When salt is placed on ice the ice melts explain why?​

When salt is placed on ice the ice melts explain why?