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3 years ago

Only humans can remove carbon from this carbon sink / reservoir.

2 answers:

7 0

The answer is D. Fossil fuels are a carbon reservoir that is only accessible to humans. Plants and animals are also carbon based but they are accessed by other plants and animals naturally. The atmosphere is a large carbon reservoir as well but it can be accessed by plants. Think how plants require carbon in the air to live. So the answer must be D.

FinnZ [79.3K]3 years ago

3 0

I think it was D. Hopefully I’m right

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Calculate the moles of FeFe in 1.17×10221.17×1022atoms of FeFe.

Ivenika [448]

Answer:

The number of moles of Fe in 1.17*10^22 atoms Fe is 0.0194 moles

Explanation:

Step 1: Data given

Number of atoms of Fe = 1.17 * 10^22 atoms

Number of Avogadro = 6.022 *10^23

Step 2: Calculate number of moles Fe

Moles Fe = atoms Fe / number of Avogadro

Moles Fe = 1.17*10^22 atoms / 6.022*10^23 / moles

Moles Fe = 0.0194 moles

The number of moles of Fe in 1.17*10^22 atoms Fe is 0.0194 moles

4 0

3 years ago

Does alcohol affect enveloped or naked viruses more

slega [8]

Answer:

the protein capsid of naked viruses is less susceptible to environmental . condition

Explanation:

because the envelop is made in part of phospholipids. once the envelop is lysed ,the virus loses its functiovnal receptors and still able to infect susceptible cells.

7 0

3 years ago

The peregrine falcon has been measured as Traveling up to 350 km/hr in a dive. if this falcon can fly to the moon at this speed,

soldi70 [24.7K]

Answer:

4 × 10⁶ sec

Explanation:

The distance between the earth and the moon = 384,400 km

The speed of the peregrine falcon = 350 km/hr

Considering,

Distance = Speed × Time

So,

Time = Distance / Speed = 384,400 km / 350 km/hr = 1098.28571 hrs

Also,

1 hr = 3600 sec

So,

1098.28571 hrs = 3600 × 1098.28571 s ≅ 4 × 10⁶ sec

Thus time taken by peregrine falcon if falcon fly to the moon = 4 × 10⁶ sec

3 0

3 years ago

A student needs to prepare a stock solution for the lab - 500.0 ml of 0.750 m nitric acid. The student is provided with concentr

dlinn [17]

Molarity of concentrated nitric acid = 15.9 M

Volume of the stock solution to be prepared = 500.0 mL

Concentration of the stock that is to be prepared = 0.750 M

Calculating moles from molarity and volume of stock:

$500.0mL*\frac{1L}{1000mL}*0.750\frac{mol}{L} =0.375 mol HNO_{3}$

Calculating volume of concentrated nitric acid to be taken for the preparation of stock solution:

$0.375mol*\frac{1L}{15.9mol} =0.0236 L$

Converting L to mL:

$0.0236L*\frac{1000mL}{1L}$ = 23.6 mL

Volume of distilled water to be added to 23.6 mL of 15.9 M nitric acid to get the given concentration = 5000.0mL-23.6mL=976.4 mL

Therefore, 976.4 mL distilled water is to be added to 23.6 mL of 15.9 M nitric acid solution to prepare 500.0 mL of 0.750M nitric acid.

6 0

4 years ago

Name two device that are using spinning

ikadub [295]

<h3>Two device that are using spinning</h3>

→ Takli

Takli is a small support style spindle. Takli is a perfect tool for spinning cotton, and this are used too to spin fibers, cotton, cashmere, and silk etc. Takli is known as handspindle. And it is the simplest device for spinning.

→ Charkha

Charkha is a device for spinning thread or yarn from fibers etc. This are known as spinning wheel.

7 0

3 years ago