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Gwar [14]
3 years ago
7

2. Define and describe a mixture using examples.

Chemistry
1 answer:
netineya [11]3 years ago
5 0

A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs.

A mixture can usually be separated back into its original components. Some examples of mixtures are a tossed salad, salt water and a mixed bag of M&M's candy.

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Calculate the molarity a solution that is obtained by dissolving 20 g of KCl in enough water to obtain 355 mL of the solution. A
tester [92]

Answer:

a) Molarity KCl = 0.755 M

b) molality HNO = 5.09 m

Explanation:

  • Formality (F) = moles sto / L sln
  • Molarity (M) = # dissolved specie / L sln
  • molality (m) = moles sto / Kg ste
  • %p/p = ( g sto / g ste ) * 100

a) KCl ↔ K+  +  Cl-

moles KCL:

⇒ 20 g KCl * ( mol / 74.6 g ) = 0.268 mol KCl

⇒ F = 0.268 mol KCl / 0.355 L = 0.755 F

⇒ M [ K+ ] = 1 * ( 0.755) = 0.755 M

b) 24% HNO:

calculation base: 1 g solution:

⇒24 = ( g sto / g sln) * 100

⇒ 0.24 = g sto / 1

⇒ g sto = 0.24g  

⇒g sln = 1 - 0.24 = 076g sln

⇒Kg ste = 0.76 g * ( Kg / 1000g ) = 7.6 E-4 Kg ste

moles sto (HNO):

⇒ 0.24g * ( mol / 62.03g) = 3.869 E-3 moles HNO

⇒ m = 3.869 E-3 moles HNO / 7.6 E-4 Kg sln

⇒ m = 5.09 mol/Kg

3 0
4 years ago
In which reaction do four total molecules of reactants produce two total molecules of products?
Pachacha [2.7K]

Answer:

option D = N₂ + 3H₂   →   2NH₃

Explanation:

The reaction in which the nitrogen and hydrogen are reacted to form the ammonia is true.

  N₂ + 3H₂   →   2NH₃

In this reaction we can see that one molecules of nitrogen react with three molecules of hydrogen and form two molecules of ammonia.

while the other options are in correct because,

2SO₂  +  O₂    →   2SO₃

In this reaction two molecules of SO₂ react with one molecule of oxygen and form two molecules of SO₃.

2H₂S  +  3O₂   →     2SO₂ + 2H₂O

In this reaction two molecules of H₂S react with three molecules of oxygen and produced four molecules of product.

SnO₂ +  2H₂   →  Sn + 2H₂O

This is also incorrect because three molecules of reactant form three molecules of product.

5 0
3 years ago
Acid rain is: dust, soot, and other finely divided solid and liquid particles. a condition associated with smog that causes eye
anastassius [24]

Answer:

The correct option is: the precipitation of acidic compounds formed when components of air pollution interact with other components in the air.

Explanation:

<u>Acid rain</u> is a form of precipitation which is usually <u>acidic in nature</u>. The acidic nature of rain is due to the reaction of <u>water molecules with sulfur dioxide, carbon dioxide and nitrogen oxide present in the air, to produce acids.</u>

There are many adverse effects of acid rain, some of them are: effect on water bodies, forests, living organisms, corrosion of structures made of steel and weathering of buildings.

4 0
3 years ago
One of the few xenon compounds that form is cesium xenon heptafluoride (CsXeF7). How many moles of CsXeF7 can be produced from t
larisa [96]
The balanced chemical equation is written as:

<span>CsF(s) + XeF6(s) ------> CsXeF7(s)

We are given the amount of </span>cesium fluoride and <span>xenon hexafluoride used for the reaction. We need to determine first the limiting reactant to proceed with the calculation. From the equation and the amounts, we can say that the limiting reactant would be cesium fluoride.  We calculate as follows:

11.0 mol CsF ( 1 mol </span>CsXeF7 / 1 mol CsF ) = 11.0 mol <span>CsXeF7</span>
6 0
3 years ago
Read 2 more answers
In the following problem, which is the unknown quantity?
babunello [35]

Answer:

B

Explanation:

8 0
3 years ago
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