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JulijaS [17]
1 year ago
12

HELP!!!! Will mark give 5 stars and thank!! Please!

Chemistry
1 answer:
Aloiza [94]1 year ago
7 0

Answer:

An endothermic reaction is a reaction where heat is taken in from the surroundings. This could be in the process of vaporisation from liquid to gas. However an exothermic reaction is when heat is given out to the surroundings. An example of this would be condensation gas to liquid!

Explanation:

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What is the molarity (M) of the following solutions?
Dennis_Churaev [7]

Answer:

The molarity (M) of the following solutions are :

A. M = 0.88 M

B. M = 0.76 M

Explanation:

A. Molarity (M) of 19.2 g of Al(OH)3 dissolved in water to make 280 mL of solution.

Molar mass of Al(OH)3 = Mass of Al + 3(mass of O + mass of H)

                                      = 27 + 3(16 + 1)

                                      = 27 + 3(17) = 27 + 51

                                      = 78 g/mole

Al(OH)_3 = 78 g/mole

Given mass= 19.2 g/mole

Mole = \frac{Given\ mass}{Molar\ mass}

Mole = \frac{19.2}{78}

Moles = 0.246

Molarity = \frac{Moles\ of\ solute}{Volume\ of\ solution(L)}

Volume = 280 mL = 0.280 L

Molarity = \frac{0.246}{0.280)}

Molarity  = 0.879 M

Molarity  = 0.88 M

B .The molarity (M) of a 2.6 L solution made with 235.9 g of KBr​

Molar mass of KBr = 119 g/mole

Given mass = 235.9 g

Mole = \frac{235.9}{119}

Moles = 1.98

Volume = 2.6 L

Molarity = \frac{Moles\ of\ solute}{Volume\ of\ solution(L)}

Molarity = \frac{1.98}{2.6)}

Molarity = 0.762 M

Molarity = 0.76 M

4 0
3 years ago
Please help asap loll
BlackZzzverrR [31]

Explanation:

Metals -

  1. Left side of periodic table
  2. Malleable
  3. Ductile
  4. Good conductor
  5. Mostly solid
  6. Shinly lusture

Non-metals -

  1. Poor conductor
  2. Dull
  3. Brittle
  4. Right side of periodic table

Metalloids -

  1. Properties of metals and non-metals.
  2. Found on the 'staircase' of the periodic table.

5 0
3 years ago
What is the advantage of having valves in the
fenix001 [56]
The valves stop the blood from flowing backwards
6 0
3 years ago
Hhhhhhhhhhheeeeeeelppppppp<br>will give brainliest
wlad13 [49]

Answer:

Kinetic energy.

Explanation:

7 0
3 years ago
a plant fertilizer contains 15% by mass nitrogen. in a container of soluble plant food. there are 10.0 oz of fertilizer . how ma
trasher [3.6K]
If we convert the ounces to grams, there are approximately 283.495 grams of plant fertiliser

If nitrogen has 15% of this, all we have to do is divide this number by 100 to get the mass of 1% and multiply it by 15.

In the end, we end up with the mass of 42.5243 g

Hope I helped! xx
7 0
3 years ago
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