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Katen [24]
3 years ago
14

Calculate the change in energy of an atom that emits a photon of wavelength 2.21 meters. (Planck’s constant is 6.626 x 10-34 jou

le seconds, the speed of light is 2.998 x 108 m/s)
Chemistry
1 answer:
sp2606 [1]3 years ago
7 0
Change in energy is E=hc/wavelength of emitted photon
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Why is photosynthesis an endothermic reaction?
diamong [38]

Answer: Option (c) is the correct answer.

Explanation:

Photosynthesis is a process in which sunlight, carbon dioxide, and water is used by the plants to make their on food.  

Plants absorb energy in the form of heat from the sunlight and thus produce glucose and oxygen from carbon dioxide and water. This absorbed energy is then used to start various chemical and biochemical reactions in the plants.

Hence, photosynthesis is an endothermic reaction.

Thus, we can conclude that a large amount of energy is required to activate the reaction.

4 0
3 years ago
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Calculate the ph of a buffer that is 0.13m in lactic acid and 0.10m in sodium lactate.
Alona [7]
According to Henderson–Hasselbalch Equation,

                                       pH  =  pKa + log [Lactate] / [Lactic Acid]
As,
      Ka of Lactic Acid  =  1.38 × 10⁻⁴

           pKa  = -log Ka
           pKa  = -log 1.38 × 10⁻⁴
           pKa  =  3.86
So,
                                  pH  =  3.86 + log [0.10] / [0.13]

                                  pH  =  4.74 + log 0.769

                                  pH  =  4.74 - 0.11

                                  pH  =  4.63
3 0
3 years ago
Put all chemicals down the drain. True or false?
Dovator [93]
False, many chemicals can be toxic to the drainage systems, and can make their way into the ocean harming sea life. 
4 0
3 years ago
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Which substances can act as an arrhenius acid in aqueous solution
My name is Ann [436]
HI acts as an arrhenius acid in solution.  It will dissociate into H⁺ and I⁻ therefore being a proton donor.  (HI is actually one of the 7 strong acids)
I hope this helps.
8 0
2 years ago
Scientists study an ecosystem devastated by drought and observe the interactions of organisms in relation to food, light, water
beks73 [17]

The correct answer is - b. If available resources decrease, then competition will increase.

All living organisms in an ecosystem are specialized in accordance to the living conditions and the food sources available. If a given ecosystem experiences prolonged drought, than the resources will decrease. With a decrease in resources, the living organisms will find themselves in a situation of scarcity. That will lead to a much increased competition, with both organisms of different species, and members of the same species. That will most likely lead to a situation where only the fittest will survive, while the weaker members of the species will probably die in that period of prolonged drought as they will not be able to get the resources they need to survive.

8 0
3 years ago
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