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3 years ago

Are energy changes always involved when substances dissolved in water

1 answer:

4 0

No. You can pour a powdered juice mix in water,and when fully dissolved it will become one. You can also leave the water to evaporate and the powdered juice mix will still be in the jug. This is a physical property which is called solubility.

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A chemist prepares a solution of mercury(II) iodide HgI2 by measuring out 0.0067μmol of mercury(II) iodide into a 350.mL volumet

yaroslaw [1]

Answer:

$\large\boxed{0.019\, \mu \text{mol/L}}$

Explanation:

$\text{Concentration } = \dfrac{\text{moles}}{\text{litres}}\\\\\text{c} = \dfrac{n}{V}$

1. Convert millilitres to litres

$\text{V = 350. mL} \times \dfrac{\text{1 L}}{\text{1000 mL}} = \text{0.3500 L}$

2. Calculate the concentration

$c = \dfrac{0.0067\, \mu\text{mol}}{\text{0.3500 L}} = \mathbf{0.019 \, \mu}\textbf{mol/L}\\\\\text{The concentration of mercury(II) iodide is $\large\boxed{\mathbf{0.019\, \mu} \textbf{mol/L}}$}.$

8 0

3 years ago

When energy is converted from one form into another, ________ is lost at every step along the way.

9966 [12]

When energy is converted from one form into another, heat is lost at every sept along the way.

a. heat.

4 0

4 years ago

Tungsten carbide is becoming popular for making jewelry. A chemist is examining a sample of tungsten carbide (chemical formula W

Studentka2010 [4]

The percent composition of W in WC is 93.868 %.

MM of WC = 183.84 u + 12.01 u = 195.85 u

% W = Mass of W/Mass of WC × 100 % = 183.84 u/195.85 u × 100 %

= 93.868 %.

5 0

3 years ago

Read 2 more answers

How many grams of P3O9 contain 9.67x10^23 atoms of oxygen?

Kobotan [32]

Answer:

49.1 g

Explanation:

First we convert 9.67x10²³ atoms of oxygen into moles, using Avogadro's number:

9.67x10²³ atoms ÷ 6.023x10²³ atoms/mol = 1.60 mol O

Then we calculate how many P₃O₉ moles there would be with 1.60 O moles:

1.60 mol O * $\frac{1molP_3O_9}{9molO}$ = 0.18 mol P₃O₉

Finally we convert 0.18 P₃O₉ moles into grams, using its molar mass:

0.18 mol P₃O₉ * 237 g/mol = 49.1 g

6 0

3 years ago

In a closed system containing three different gases as shown, X2 + Y2 2XY. Choose the TWO things that MUST happen as the volume

Kitty [74]

Answer:

3) The relative concentrations of each gas must remain constant.

4)The concentration of each gas will not change.

Explanation:

For the equilibrium system:

X₂ + Y₂ ⇄ 2XY,

The no. of moles of gases in each side is constant; there is 2 moles of gases at reactants side and 2 moles of gases at products side.

So, changing the volume will not affect on the equilibrium system.

So, the right choice is:

3) The relative concentrations of each gas must remain constant.

4)The concentration of each gas will not change.

5 0

4 years ago