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3 years ago

12

Why might people add a base to an acidic lake?

1 answer:

spayn [35]3 years ago

6 0

Answer:

To decrease the algae

Explanation:

Acid lakes have more algae than other lakes

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Which type of drugs kill pain by blocking impulses at specific receptor sites of the brain and spinal cord? narcotic analgesics

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A beaker contains 7.85 g of Cu2O. A second beaker contains some FeCl3. If the two beakers contain the same numbers of formula un

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In a constant‑pressure calorimeter, 70.0 mL of 0.350 M Ba(OH)2 was added to 70.0 mL of 0.700 M HCl. The reaction caused the temp

DanielleElmas [232]

<u>Answer:</u> The amount of heat absorbed by the solution is 2.795 kJ

<u>Explanation:</u>

To calculate the mass of water, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Density of water = 1 g/mL

Volume of water = [70 + 70] = 140 mL

Putting values in above equation, we get:

$1g/mL=\frac{\text{Mass of water}}{140mL}\\\\\text{Mass of water}=(1g/mL\times 140mL)=140g$

To calculate the heat absorbed, we use the equation:

$q=mc\Delta T$

where,

q = heat absorbed

m = mass of water = 140 g

c = heat capacity of water = 4.186 J/g°C

$\Delta T$ = change in temperature = $T_2-T_1=(28.74-23.97)^oC=4.77^oC$

Putting values in above equation, we get:

$q=140g\times 4.186J/g^oC\times 4.77^oC=2795.4J=2.795kJ$

Hence, the amount of heat absorbed by the solution is 2.795 kJ

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Xelga [282]

Answer:

'

Explanation:

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