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2 years ago

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Today, you will observe drops of liquid water and compare them to drops of liquid isopropanol, noting whether either liquid evap

orates. given that the energy transferred in from the air will be the same for both liquids, make a prediction about whether both drops or only one drop will evaporate within five minutes.

1 answer:

mote1985 [20]2 years ago

7 0

Answer:Noble gases:

are highly reactive.

react only with other gases.

do not appear in the periodic table.

are not very reactive with other elements.

Explanation:Noble gases:

are highly reactive.

react only with other gases.

do not appear in the periodic table.

are not very reactive with other elements.

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When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. 2 Al ( s ) + 6 HCl ( aq ) ⟶ 2AlCl3 ( aq ) +

Rufina [12.5K]

Answer:

The answer to your question is V = 19.9 L

Explanation:

Data

mass of Al = 8.60 g

volume of H₂ = ?

Balanced chemical reaction

2Al + 6HCl ⇒ 2AlCl₃ + 3H₂

1.- Use proportions to calculate the mass of H₂ produced

Atomic mass of Al = 2 x 27 = 54 g

Atomic mass of H₂ = 6 x 1 = 6 g

54 g of Al -------------------- 6 g of H₂

8 g of Al ------------------- x

x = (8 x 6) / 54

x = 48 / 54

x = 0.89 g of H₂

2.- Calculate the volume of H₂

- Convert the H₂ to moles

1 g of H₂ --------------- 1 mol

0.89 g ---------------- x

x = 0.89 moles

1 mol of H₂ -------------- 22.4 l

0.89 moles ------------- x

x = (0.89 x 22.4) / 1

x = 19.9 L

6 0

3 years ago

A person driving a car applies the brakes. This produces friction, which stops the car. Into which type of energy is the mechani

antiseptic1488 [7]

Answer: D. Gravitational

Explanation:

3 0

3 years ago

Help can you match the answers to the definition PLZ Need this ASAP 30 points

Alchen [17]

Answer:

1-C

2-D

3-B

4-A

Explanation:

I think it is this if it is not , sorry!

8 0

3 years ago

It is known that the kinetics of recrystallization for some alloy obey the Avrami equation andthat the value of n in the exponen

Paul [167]

Answer:

rate of recrystallization = 4.99 × 10⁻³ min⁻¹

Explanation:

For Avrami equation:

$y = 1-e ^{(-kt^n)} \\ \\ e^{(-kt^n)} = 1-y\\ \\ -kt^n = In(1-y) \\ \\ k = \dfrac{-In(1-y)}{t^n}$

To calculate the value of k which is a dependent variable for the above equation ; we have:

$k = \dfrac{-In(1-0.40)}{200^{2.5}}$

$k = 9.030 \times 10 ^{-7}$

The time needed for 50% transformation can be determined as follows:

$y = 1-e ^{(-kt^n)} \\ \\ e^{(-kt^n)} = 1-y\\ \\ -kt^n = In(1-y) \\ \\ t =[ \dfrac{-In(1-y)}{k}]^{^{1/n}}$

$t_{0.5} =[ \dfrac{-In(1-0.4)}{9.030 \times 10^{-7}}]^{^{1/2.5}}$

= 200.00183 min

The rate of reaction for Avrami equation is:

$rate = \dfrac{1}{t_{0.5}}$

$rate = \dfrac{1}{200.00183}$

rate = 0.00499 / min

rate of recrystallization = 4.99 × 10⁻³ min⁻¹

8 0

3 years ago

What will happen when the rates of evaporation and condensation are equal

Ilia_Sergeevich [38]

A random person put the answer for you

6 0

3 years ago