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2 years ago

Why do trees produce carbon dioxide (CO2) at night?.

Chemistry

1 answer:

TiliK225 [7]2 years ago

5 0

Answer:

Because photosynthesis ceases due to the lack of sunlight.

Explanation:

Plants typically absorb CO2 and release oxygen, but they also “exhale” CO2, particularly at night, when photosynthesis ceases due to the lack of sunlight. Forests also emit more CO2 when they are stressed by increasing temperatures.

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Explain why you need a control group

Mariulka [41]

Answer: You need a control group because......

Explanation: You need a control group in order to study if there is any difference in behavior between two groups when an external stimulant is introduced.

7 0

4 years ago

A solution of H 2 SO 4 ( aq ) with a molal concentration of 1.66 m has a density of 1.104 g / mL . What is the molar concentrati

uysha [10]

Answer:

1.58 M

Explanation:

$H_2SO_4$ is 1.66 m concentration.

Which means that 1.66 moles of $H_2SO_4$ are present in 1 kg of the solvent, water.

Mass of water = 1 kg = 1000 g

Moles of $H_2SO_4$ = 1.66 moles

Molar mass of $H_2SO_4$ = 98.079 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$1.66\ mole= \frac{Mass}{98.079\ g/mol}$

$Mass_{H_2SO_4}= 162.81114\ g$

Total mass = 1000 g + 162.81114 g = 1162.81114 g

Density = 1.104 g/mL

Volume of the solution = Mass / Density = 1162.81114 / 1.104 mL = 1053.27 mL = 1.05327 L

Considering:-

<u>Molarity = moles/ Volume of solution = 1.66 / 1.05327 M = 1.58 M </u>

4 0

3 years ago

Can formaldehyde molecules dissolve well in water?

Mice21 [21]

Answer:

Formaldehyde is highly soluble in water.

Explanation:

Formaldehyde is the simplest of the aldehydes (R−CHO) it is an organic compound which occurs naturally with the formula H−CHO. . The IUPAC name of formaldehyde is methanal.

Formaldehyde at room temperature is a colorless gas and the liquid is invisible or like white-water. Formaldehyde has an irritating and very pungent like odour. Formaldehyde is very soluble in water.

Now according to Henry's constant law (3 × 10-5 kPa·m3/mol) Formaldehyde will be very unlikely to volatilize from water.and hence, Formaldehyde is considered to be highly soluble in water.

3 0

4 years ago

If the density of HCl is 1.49 g/mL, What is the volume of 3.5 g of hydrochloric acid?

OLga [1]

Answer:

hope it helps

Explanation:

volume= mass/density

volume= 3.5/1.49

volume= 2.34

8 0

3 years ago

What is the difference between melting and evaporation?

Ganezh [65]

Because i think melting is kinda the biproduct of evaporation.

3 0

4 years ago