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3 years ago

Explain why burning of wood and cutting it into small pieces are considered as two

Chemistry

1 answer:

Reika [66]3 years ago

7 0

Answer:

When wood is burnt , it turns into ashes which is a new substance and process is irreversible one,( chemical change)

When wood is cut into smaller pieces (firewood) this is a physical change

Explanation:

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2) Show the calculation of Kc for the following reaction if an initial reaction mixture of 0.800 mole of CO and 2.40 mole of H2

nadezda [96]

Answer:

Kc = 3.90

Explanation:

CO reacts with $H_2$ to form $CH_4$ and $H_2O$ . balanced reaction is:

$CO(g) + 3H_2 (g) \leftrightharpoons CH_4(g) + H_2O(g)$

No. of moles of CO = 0.800 mol

No. of moles of $H_2$ = 2.40 mol

Volume = 8.00 L

Concentration = $\frac{Moles}{Volume\ in\ L}$

Concentration of CO = $\frac{0.800}{8.00} = 0.100\ mol/L$

Concentration of $H_2$ = $\frac{2.40}{8.00} = 0.300\ mol/L$

$CO(g) + 3H_2 (g) \leftrightharpoons CH_4(g) + H_2O(g)$

Initial 0.100 0.300 0 0

equi. 0.100 -x 0.300 - 3x x x

It is given that,

at equilibrium $H_2O (x)$ = 0.309/8.00 = 0.0386 M

So, at equilibrium CO = 0.100 - 0.0386 = 0.0614 M

At equilibrium $H_2$ = 0.300 - 0.0386 × 3 = 0.184 M

At equilibrium $CH_4$ = 0.0386 M

$Kc=\frac{[H_2O][CH_4]}{[CO][H_2]^3}$

$Kc=\frac{0.0386 \times 0.0386}{(0.184)^3 \times 0.0614} =3.90$

8 0

3 years ago

List 3 elements that have similar properties or reactivity. Justify your answer with reasoning.

Rus_ich [418]

Answer:

Lithium, Potassium and Calcium

Explanation:

Because they are all in group one of the periodic table

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3 years ago

Highlight the claim.

Dahasolnce [82]

Answer:

The claim is: Therefore Mitosis requires less energy than sexual reproduction does.

Explanation:

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3 years ago

(WILL GIVE BRAINLESS )Complete the sentence describing Newton's third law of motion: For every action in one direction, O b ос O

Liono4ka [1.6K]

Answer:

An equal force acts in the opposite direction.

Explanation:

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3 years ago

Draw a diagram (develop a model) that shows what happens when warm water mixes with cold water in the ocean. Use your model to e

Leokris [45]

Ocean currents determine the various directions of wind movement.

<h3>What is ocean current?</h3>

Ocean currents are caused by differences in density as well as the temperature of the moving winds across the ocean. In the ocean, warm water is found at the top while cooler water occurs far below.

Warm ocean currents originate near the equator and move towards the poles. The ocean currents control the direction of winds in an area.

Learn more about ocean currents: brainly.com/question/20823678

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2 years ago