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Lana71 [14]
2 years ago
14

A scientist observed that in the presence of light, plants use carbon dioxide and water to make glucose and oxygen. This chemica

l process is called photosynthesis. Which type of energy is transformed into chemical energy, based on the scientist's observations? Answer options with 4 options A. light energy from the sun B. kinetic energy from water C. chemical energy from oxygen D. heat energy from the environment
Chemistry
1 answer:
pav-90 [236]2 years ago
8 0

Answer:

Option A, light energy from the sun

Explanation:

In the process of photosynthesis, the energy from sun in the form of light and heat is taken to undergo glycolysis and prepare glucose/starch (chemical).  

Thus, the light and heat energy of sun is converted into the chemical energy.  

Option B and C are incorrect because no kinetic energy or chemical energy is taken from any source.  

Option D is also incorrect because heat is taken but it is not taken from the surrounding environment. The source of heat energy is sun.  

Thus, only option A is correct

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Determine the pH of the following base solutions. (Assume that all solutions are at 25°C and the ion-product constant of water,
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Answer:

a) The pH of the solution is 12.13.

b) The pH of the solution is 12.17.

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Ionic product of water =K_w=1.01\times 10^-{14}

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Taking negative logarithm on both sides:

-\log[1.01\times 10^-{14}]=(-\log [H^+])+(-\log [OH^-])

The pH is the negative logarithm of hydrogen ion concentration in solution.

The pOH is the negative logarithm of hydroxide ion concentration in solution.

13.99=pH+pOH

a) 1.39\times 10^{-2} M of NaOH.

Concentration of hydroxide ions:

NaOH(aq)\rightarrow Na^+(aq)+OH^-(aq)

So, [OH^-]=1\times [NaOH]=1\times 1.39\times 10^{-2} M=1.39\times 10^{-2} M

pOH=-\log[1.39\times 10^{-2} M]=1.86

13.99=pH+pOH

13.99=pH+1.86

pH=13.99-1.86=12.13

b) 0.0051 M of NaOH.

Concentration of hydroxide ions:

Al(OH)_3(aq)\rightarrow Al^{3+}(aq)+3OH^-(aq)

So, [OH^-]=3\times [Al(OH)_3]=3\times 0.0051 M=0.0153 M

pOH=-\log[0.0153 M]=1.82

13.99=pH+pOH

13.99=pH+1.82

pH=13.99-1.82=12.17

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The mass of a jar of sugar is 11. 9 kg. What is the total mass of 13 jars of sugar?.
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154.7

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11.9kg x 13 = 154.7

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