7.

Identify each process numbered 1-6

Vedmedyk [2.9K]

Answer:

1 = Melting

2 = Freezing

3 = Sublimation

4 = Deposition

5 = Condensation

6 = Boiling

Explanation:

7 0

3 years ago

3) A certain reaction has the following general form: A + B à AB At a particular temperature the concentration versus time were

seropon [69]

Answer:

a. First order.

b. $k=3.7x10^{-3}s ^{-1}$

c. $t_{1/2}=187.3s$

d. $[A]=0.111M$

Explanation:

Hello.

a. In this case since the slope is in s⁻¹ we can infer that the lineal form of the rate law is:

$ln[A]=-kt+ln[A]_0$

Which is also:

$y=mx+b$

It means that the reaction is first-order as slope equals the negative of the rate constant which also has units of first-oder reaction.

b. Since the slope is −3.7 x 10−3 s−1 the rate constant is:

$k=-m\\\\k=-(-3.7x10^{-3}s ^{-1})\\\\k=3.7x10^{-3}s ^{-1}$

c. For first-order reactions, the half-life is:

$t_{1/2}=\frac{ln(2)}{k}\\ \\t_{1/2}=\frac{ln(2)}{3.7x10^{-3}s^{-1}}\\\\t_{1/2}=187.3s$

d. In this case, since the integrated first-order rate law is:

$[A]=[A]_0exp(-kt)$

The concentration once 220 seconds have passed is:

$[A]=0.250Mexp(-3.7x10^{-3}s^{-1}*220s)\\\\$

$[A]=0.111M$

Regards.

7 0

4 years ago

Water 2270g is heated until it just begins to boil. If the water absorbs 5.51 ×10^5 J of heat in the process, what was the initi

kolbaska11 [484]

Answer:

42.01 °C

Explanation:

<u>Step 1: explain the problem</u>

We have to find the initial temperature, when a certain amount of heat raises this sample of water to its boiling point ( 100 °C)

⇒this amount of heat = 5.51 x 10Δ^5 J

We will use the formule : Q = mcΔ T

with Q = heat transfer ( J)

with m = mass of the substance (g)

with c = specific heat ( J/g °C)

with Δ T = temperature change ( in °C or K)

Water has a specific heat of 4.186 J/g °C

<u>Step 2 : Calculate the initial temperature </u>

We have to rearrange the formule first:

Δ T = Q / mc

In this case we have :

Δ T = 5.51 * 10^5 J / 2270 g * 4.186 J/g °C = 57.99

⇒ The final temperature of the water is the boiling point (100 °C) and the change of temperature is 57.99. This means that the boiling point is 57.99 °C higher than the initial temperature.

This means : Δ T = Tboiling point - Tinitial

Δ T = 57.99 °C = 100 °C - Tinitial

Tinitial = 100 °C - 57.99 °C = 42.01 °C

The initial temperature of the water is 42.01 °C

.

6 0

4 years ago

enny places a strip of pH paper into a solution. When she removes the pH paper, it has turned yellow-green. What should Jenny do

Svetllana [295]

Compare it to the chart showing how base or acidic a substance is

8 0

4 years ago

Explain why fossil fuels are exhaustible natural resources

zloy xaker [14]

Answer:

Fossil Fuels are exhaustible natural resources, because they can't be renewed. Once these fuels are used up, there are NONE left! We can change that by reducing the amount we use. It takes millions of years for it to be remade, and we will soon die out before that happens. Thats why fossil fuels are exhaustible. :)

Explanation:

Hope this helps! :)

7 0

3 years ago