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3 years ago

What evidence of a chemical reaction might you see in the following cases?

1 answer:

5 0

For bleaching a stain, there will be an identifiable odor and it will easily absorb colors and/or stains. Burning a match also has odor involved, but the smoke that is released is from a hot fire that is chemically produced by the formula to make the tip of the match.

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A chemist wants to find Kc for the following reaction at 709 K:2NH3(g) + 3 I2 (g) ----> 6HI(g) + N2(g)

irakobra [83]

Answer:

422455.41

Explanation:

Corrected from source,

Given that:-

$N2(g) + 3 H2(g)\rightarrow 2NH3(g) \ Kc_1 = 0.314$

The equilibrium constant for the reverse reaction will be the reciprocal of the initial reaction.

The value of equilibrium constant the reaction

$2NH3(g)\rightarrow N2(g) + 3 H2(g)$

is:

$Kc_{1}'=\frac{1}{0.314}$

$H2(g) + I2(g)\rightarrow 2 HI(g)\ Kc_2 = 51$

If the equation is multiplied by a factor of '3', the equilibrium constant of the reverse reaction will be the cube of the equilibrium constant of initial reaction.

The value of equilibrium constant the reaction

$3H2(g) + 3I2(g)\rightarrow 6 HI(g)$

is:

$Kc_{2}'={51}^3$

Adding both the reactions we get the final reaction. So, the equilibrium constants must be multiplied.

The value of equilibrium constant the reaction

$2NH3(g) + 3I2(g)\rightarrow 6 HI(g) + N2(g)$

is:

$Kc'=\frac{1}{0.314}\times {51}^3$ = 422455.41

3 0

3 years ago

Pepper is trying to determine the density of her gold ring. The ring’s mass is 100 grams and the volume displaced by the ring is

defon

Answer:

Explanation:

5 0

3 years ago

Mutations are more important to the evolution of a species because

EleoNora [17]

Answer: Mutations are important to the evolution of a species because is creates new DNA for a certain gene, creating a new allele.

Hope this helps!!! Good luck!!! ;)

8 0

3 years ago

To determine the absolute age of rocks and fossils, geologists use _____.

Pavlova-9 [17]

Answer:

The rates of decay of radioactive elements

Explanation:

The age of a rock in years is called its absolute age. Geologists find absolute ages by measuring the amount of certain radioactive elements in the rock. When rocks are formed, small amounts of radioactive elements usually get included.

7 0

3 years ago

9. You have a mini bottle of pure maple syrup. The full container has a mass of 137

cupoosta [38]

Answer:

Explanation:EDGE

7 0

2 years ago