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3 years ago

PLEASE ANSWER

Chemistry

1 answer:

Vikki [24]3 years ago

4 0

D) refracted
because , the light changes direction.. causing the penny to look bigger than it is.

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Convert mass to moles for both reactants. 2.50g CuCl2 0.50g Al

alexandr402 [8]

Answer:

Number of moles of Al = 0.02 mol

Number of moles of CuCl₂ = 0.02 mol

Explanation:

Given data:

Mass of CuCl₂ = 2.50 g

Moles of CuCl₂ = ?

Solution:

Formula:

Number of moles = mass / molar mass

Molar mass of CuCl₂ = 63.546 + 35.5 ×2

Molar mass of CuCl₂ = 134.546 g/mol

Now we will put the values in formula:

Number of moles = 2.50 g / 134.546 g/mol

Number of moles = 0.02 mol

Given data:

Mass of Al = 0.50 g

Moles of Al = ?

Solution:

Formula:

Number of moles = mass / molar mass

Molar mass of Al = 27 g/mol

Now we will put the values in formula:

Number of moles = 0.50 g / 27 g/mol

Number of moles = 0.02 mol

6 0

4 years ago

Which of the following definitions best describes the term "vapor pressure?a. Pressure and temperature values on a phase diagram

mamaluj [8]

Answer:

b. In equilibrium with the liquid phase, the pressure exerted by a gas.

Explanation:

When a liquid is warmed up to a temperature , it starts vaporising . The liquid is turning into gas and gas is turning into liquid at different rates . Initially the rate of former is higher but gradually the difference of rate between them decreases to zero . At this point the rate of conversion of liquid into gas and rate of conversion of gas into liquid becomes equal . This is called dynamic equilibrium point .

If we change the temperature , the equilibrium gets disturbed .

At this point the pressure exerted by the gas is called the vapour pressure of the liquid .

So option b ) is correct .

5 0

3 years ago

2.61 kilograms of water in a container have a pressure of 200 kPa and temperature of 200°C . What is the volume of this containe

Arisa [49]

Answer: The volume of the container is $2.8497m^3$

Explanation:

To calculate the volume of water, we use the equation given by ideal gas, which is:

$PV=nRT$

or,

$PV=\frac{m}{M}RT$

where,

P = pressure of container = 200 kPa

V = volume of container = ? L

m = Given mass of water = 2.61 kg = 2610 g (Conversion factor: 1kg = 1000 g)

M = Molar mass of water = 18 g/mol

R = Gas constant = $8.31\text{L kPa }mol^{-1}K^{-1}$

T = temperature of container = $200^oC=[200+273]K=473K$

Putting values in above equation, we get:

$200kPa\times V=\frac{2610g}{18g/mol}\times 8.31\text{L kPa }\times 473K\\\\V=2849.7L$

Converting this into cubic meter, we use the conversion factor:

$1m^3=1000L$

So, $\Rightarrow \frac{1m^3}{1000L}\times 2849.7L$

$\Rightarrow 2.8497m^3$

Hence, the volume of the container is $2.8497m^3$

6 0

3 years ago

Is the sky a solid liquid or gas

s2008m [1.1K]

Gas.
The sky is not solid, not liquid but of gas. It is also called the atmosphere, one of the important spheres on earth that influences the climate –temperature, humidity, precipitation, atmospheric pressure, and the biotic community as a whole. The atmosphere or the sky is composed of many layers and is responsible to protecting the living organisms of the earth against the deadly ultraviolet rays and other strong radiation coming from the sun.

6 0

3 years ago

Read 2 more answers

Consider that agricultural and technological advances allow for a much larger carrying capacity of humans on the planet. Would y

Marat540 [252]

Well, this is obviously an opinion question, so share your opinion. If you are happy that the Agricultural Revolution(s) paved way for the earth to sustain billions of people, then that's great. But, if you wish there were fewer people on the planet, then share that. Of course, both sides have their pros and cons. Just share your opinion. Good luck!

3 0

3 years ago