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3 years ago

I have asked this already!!!!!

Chemistry

1 answer:

stellarik [79]3 years ago

6 0

Answer:

01) Cu tting hair is a physical change. reason-1

02) Cooking can be either one, but I would choose chemical reason-3

03) Ice cream melting is a physical change reason-2

Explanation:

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Equal molar amounts of H2 and I2 are placed into an evacuated container and heated to 445°C, where the following equilibrium is

Rus_ich [418]

Answer: The initial concentration of $H_2\text{ and }I_2$ are 0.0192 M and 0.0192 M respectively.

Explanation:

We are given:

Equilibrium concentration of HI = 0.030 M

Moles of hydrogen gas = Moles of iodine gas (concentration will also be the same)

For the given chemical equation:

$H_2+I_2\rightleftharpoons 2HI$

Initial: x x -

At eqllm: x-c x-c 2c

Calculating the value of 'c'

$2c=0.030\\\\c=\frac{0.030}{2}=0.015M$

The expression of $K_{eq}$ for above reaction follows:

$K_{eq}=\frac{[HI]^2}{[H_2]\times [I_2]}$

We are given:

$K_{eq}=50.2$

$[H_2]=(x-c)=(x-0.015)$

$[I_2]=(x-c)=(x-0.015)$

Putting values in above equation, we get:

$50.2=\frac{(0.030)^2}{(x-0.015)\times (x-0.015)}\\\\x=0.0108,0.0192$

Neglecting the value of x = 0.0108 M, because the initial concentration cannot be less than the equilibrium concentration.

x = 0.0192 M

Hence, the initial concentration of $H_2\text{ and }I_2$ are 0.0192 M and 0.0192 M respectively.

5 0

3 years ago

PLEASE ANSWER FAST

neonofarm [45]

Answer:

D. that the nucleus is located at the center of the atom

I hope that this helps!

6 0

3 years ago

Read 2 more answers

Briefly discuss interpretations of your observations and results. Discuss how your observations illustrated LeChatelier's princi

Dvinal [7]

Answer:

Le Chatelier's principle can be applied in explaining the results

Explanation:

According to Le Chatelier's principle, when a constraint such as a change in concentration in this case is imposed on a chemical system in equilibrium, the system will adjust itself in such a way as to annul the constraint imposed.

Hence, when the color of the solution was more like that of the control, the reaction would shift towards the left. Similarly, when the color was more like it was towards the reactant, the reaction would shift towards the right.

If we were to prepare calcium oxalate, we should prepare it in a base solution. This is because when the base was added to calcium oxalate, it did not form any precipitate but when an acid was added to the calcium oxalate, it formed a precipitate.

4 0

3 years ago

I NEED HELP ASAPPPPPPPPPPPPPPPP

RoseWind [281]

Answer:

i wold think it is C

Explanation:

8 0

3 years ago

Read 2 more answers

2. Identify items in your life that are made of each type of element: metal, nonmetal, and metalloid. For each item, explain why

Bad White [126]

Metalloids:alloys of metallods are commonly used in discs like compact discs, CDs ,and DVDs .These materials change from glassy to crystalline with the application of heat which makes them useful as data storage media

3 0

3 years ago