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3 years ago

What has been the effect of increased population on Earth's natural resources?

Chemistry

1 answer:

olya-2409 [2.1K]3 years ago

5 0

Answer:

Generally speaking, as the human population grows, our consumption of natural resources increases. More humans consume more freshwater, more land, more clothing, etc. Scientific and technological innovations mean that we are improving our efficiency at using and harvesting natural resources.

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What mass of zinc will completely react with 125.0 mL of a solution of nitric acid (HNO3) which has concentration of 0.850M?

kati45 [8]

The mass of zinc required to react with HNO3 is 3.45 g

<h3>What is moles of HNO3 reacting?</h3>

The moles of HNO3 reacting is calculated using the formula below:

moles = concentration × volume

volume = 0.850

volume = 125.0 mL = 0.125 L

Moles of HNO3 = 0.850 × 0.125 = 0.10625 moles

Equation of reaction:

Zn + 2 HNO3 --> Zn(NO3)2 + H2

2 moles of HNO3 reacts with 1 mole of Zn.

moles of zinc reacting = 0.10625/2 = 0.053125

Mass of zinc = moles × molar mass

molar mass of Zn = 65

Mass of zinc = 0.053125 × 65

mass of Zn = 3.45 g

Therefore, the mass of zinc will completely react with 125.0 mL of a solution of nitric acid (HNO3) which has concentration of 0.850M is 3.45 g

Learn more about moles at: brainly.com/question/15356425

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3 years ago

512,420,000 in scientific notation

klemol [59]

The answer is 5.1242x10^8

6 0

3 years ago

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Sindrei [870]

Answer:

x²+6x+5=0

On comparing with the equation

ax² + bx + c = 0

a=1, b = 6 and c = 5

Now

b²– 4ac = 6² – 4 x 1 x 5 = 36 - 20 = 16

$x = \frac{ - b \:± \: \sqrt{b {}^{2} - 4ac } }{2a} \\ \\ x = \frac{ - 6\:± \: \sqrt{16 } }{2 \times 1} \\ \\ x = \frac{ - 6± {4} }{2} \\ \\ x = \frac{ - 6 + {4} }{2} \: \: or \: \: x = \frac{ - 6 - {4} }{2} \\ \\ \implies \: x = \frac{ \cancel-2 }{ \cancel2}^{-1 }\: \: or \: \: x = \frac{ \cancel-10 }{ \cancel2}^{-5}\\ \\ \implies \: { \blue{\fbox{ \: x = - 1 \: \: \: or \: \: \:x = - 5}}}$

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2 years ago

Read 2 more answers

What is the mass in grams of 6.022 x 1023 molecules of CO2?

Kamila [148]

Answer: Molar mass of CO2 is 44 gram/mol. So,the mass of 1 mole or 6.02*10^23 molecules of CO2 is 44 grams

Explanation:

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3 years ago

Can we move only one electron from its orbit to another orbit of lower energy without moving other electrons of the atom? well i

Mrac [35]

Yes, it can happen.

If all the lower energy orbits are already filled with electrons, then it cannot happen since the lower orbitals will already be full, hence another electron will have to move.

However, if the lower energy orbits are not full (for instance if one excited electron goes back to its normal state), then it can happen.

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3 years ago