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valentinak56 [21]
3 years ago
6

Which of the following are some examples of rapid environmental changes?

Chemistry
2 answers:
Zina [86]3 years ago
6 0
I think it’s weather
Marysya12 [62]3 years ago
6 0

Answer: Fires, Weather and Landslides are examples of rapid environmental changes

Explanation:

Environmental changes are currently one of the world’s major issues. Rapid changes in the environment is mostly attributed to anthropogenic factors in the environment such as CO2 emission, gas combustion in industries soil erosion from man-made inputs leading to landslides from road networks, hence the changes in the weather condition as well as fire, and landslides. As at 40 – 60 million years ago during the cretacious period, the earth experienced warmer conditions conducive enough for habitation, whereas existing conditions now in the 21st century are colder, producing harsh conditions that are sometimes considered to be bad to breath in. Hence the reason why Fires arising from deforestation, landslides from bad man-made planning in constructional projects and Climate change causing a depletion in the Ozone layer are considered to be an example of rapid environmental changes.

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How many grams does f Cacl2 should be dissolved in 750.0 mL of water to make a 0.100 M solution Cacl2
AVprozaik [17]

Answer:

8.324 g

Explanation:

First we <u>convert 750.0 mL into L</u>:

  • 750.0 mL / 1000 = 0.750 L

Then we <u>calculate the required number of moles of CaCl₂</u>, using the <em>definition of molarity</em>:

  • Molarity = moles / liters
  • Molarity * liters = moles
  • 0.100 M * 0.750 L = 0.075 mol

Finally we <u>convert 0.075 moles of CaCl₂ into grams</u>, using its <em>molar mass</em>:

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6 0
3 years ago
Facts about the digestive system
jenyasd209 [6]
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3 years ago
In the electrolysis of water, how long will it take to produce 165.0 L of H2 at 1.0 atm and 273 K using an electrolytic cell thr
vladimir2022 [97]

In the electrolysis of water,  3490 hour will it take to produce 165.0 L of H2 at 1.0 atm and 273 K using an electrolytic cell through which the current is 113.0 mA.

<h3>What is Ideal Gas Law ?</h3>

The ideal gas law states that the pressure of gas is directly proportional to the volume and temperature of the gas.

It is expressed as

PV = nRT

where,

P = Pressure

V = Volume in liters

n = number of moles of gas

R = Ideal gas constant

T = Temperature in kelvin

Here,

P = 1.0 atm

V = 165.0 L

R = 0.0821 atm. L/mol.K (Ideal gas constant)

T = 273 K

n = ?

Now put the value in above expression, we get

PV = nRT

1.0 atm × 165.0 L = n × 0.0821 atm. L/mol.K × 273 K

165.0 atm. L = n × 22.4  atm. L/mol

n = \frac{165.0\ \text{atm. L}}{22.4\ \text{atm. L/mol}}

n = 7.36 mol

The reaction is

2H⁺ + 2e⁻ → H₂

1 mol of electrons is produced from 96500 C

So,

96500 \frac{C}{\text{mol} \times e} \times 2e \times 7.36\ \text{mol}

<em>= </em>1,420,480 C

<u>Convert milliampere to C/s</u>

1mA = 0.001 C/s

113.0 mA = 113.0 × 0.001

               = 0.113 c/s

<h3>What is relationship between current, charge and time ?</h3>

The relation between current, charge and time is expressed as:

I = \frac{Q}{t}

where,

I = Current

Q = Charge in Coulomb

t = time

Now put the value in above formula we get

I = \frac{Q}{t}

  = \frac{1,420,480\ C}{0.113\ C/s}

  = 12,570,619.469 s

  = 3490 hour

Thus from the above conclusion we can say that In the electrolysis of water,  3490 hour will it take to produce 165.0 L of H2 at 1.0 atm and 273 K using an electrolytic cell through which the current is 113.0 mA.

Learn more about the Ideal Gas Law here: brainly.com/question/25290815

#SPJ4

5 0
2 years ago
How many grams are in 2.4 moles of NH4?
xxTIMURxx [149]

Answer: 43.2 grams

Explanation:

Given that,

Amount of moles of NH4 (n) = 2.4

Mass of NH4 in grams (m) = ?

For molar mass of NH4, use the molar masses of:

Nitrogen, N = 14g;

Hydrogen, H = 1g

NH4 = 14g + (1g x 4)

= 14g + 4g

= 18g/mol

Since, amount of moles = mass in grams / molar mass

2.4 mole = m / 18g/mol

m = 2.4 mole x 18g/mol

m = 43.2g

Thus, there are 43.2 grams in 2.4 moles of NH4.

8 0
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Answer:

456g

Explanation:

that's the answer for the question

8 0
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