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exis [7]
3 years ago
14

Examples of endothermic reactions

Chemistry
2 answers:
ruslelena [56]3 years ago
7 0

Answer:

Decomposition of limestone by heating ( all thermal decomposition reactions are endothermic), photosynthesis, dissolving of ammonium salts in water

KATRIN_1 [288]3 years ago
5 0

Answer: melting ice cubes, melting solid salts, evaporating liquid water

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Matter is everything around you, atoms and molecules are all composed of matter.
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Which of the following statements about Bohr's model of the atom is true? Bohr's model explains the chemical behavior of all ato
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I believe the answer is "Bohr's model explains the chemical behavior of all atoms."

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Carbon-14 naturally decay to carbon-_____.<br><br> 13<br> 12<br> 10<br> 15
lorasvet [3.4K]

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13 would be correct

Explanation:

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A stock solution of HNO3 is prepared and found to contain 13.1 M of HNO3. If 25.0 mL of the stock solution is diluted to a final
musickatia [10]

Answer:

The diluted solution is 0.65 M

Explanation:

Dilution formula to solve the problem is:

M concentrated . V concentrated = M Diluted . V diluted

We can also make a rule of three though.

In 1000 mL of concentrated solution, we have 13.1 moles of  HNO₃

So in 25 mL we have (25 . 13.1 ) / 1000 = 0.327 moles of HNO₃

This moles are also in 0.500 L of diluted solution, the new molarity will be:

0.327 mol / 0.5L = 0.65 M

Molarity of diluted solution must be always lower than concentrated solution, otherwise the excersise is wrong.

If we replace in the formula

13.1 M . 25 mL = 500 mL . M diluted

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6 0
3 years ago
Nitrogen and hydrogen combine to produce ammonia.n2 + h2? nh3which set of coefficients balances the equation?
solong [7]
The equation for the production of Ammonia is:
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NH₃ (RightHandSide of equation): 1 Nitrogen Atom; 3 Hydrogen atoms
   
To balance the equation you must place in front of each compound/molecule/element that makes the amount of atom of each element equal on both sides of the equation.

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                          LHS         RHS
Nitrogen              2             2
Hydrogen            6             6

So essentially the set of coefficients you use to balance the equation are 1 for N₂, 3 for H₂ and 2 for NH₃.
3 0
3 years ago
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