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DedPeter [7]
3 years ago
14

Form the outside of the stoma. They expand and contract to _____ and _____ the stomata.

Chemistry
1 answer:
german3 years ago
7 0

Answer:

Open and close

Explanation:

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Which of the following has the lowest Ka?a. carbonic acid b. dihydrogen phosphate c. phosphoric acid d. bicarbonate
Naya [18.7K]

Explanation:

A compound or molecule which will have least dissociation and that is not able to given hydrogen ion easily upon dissociation will also have a low value of K_{a}.

Dissociation of the given compounds or species will be as follows.

 H_{2}CO_{3} \rightleftharpoons H^{+} + HCO^{-}_{3}

 H_{2}PO^{-}_{4} \rightleftharpoons H^{+} + HPO^{-}_{4}

 H_{3}PO_{4} \rightleftharpoons H_{+} + H_{2}PO^{-}_{4}

As, chemical formula of bicarbonate is HCO^{-}_{3} and due to the presence of a negative charge it is difficult to lose a positively charged hydrogen ion. This is because oppositely charged ions will be bonded by strong force of attraction.

Hence, it will not easily lose a hydrogen ion due to which bicarbonate has the lowest K_{a}.

Thus, we can conclude that out of the given species bicarbonate has the lowest K_{a}.    

7 0
3 years ago
A vial containing radioactive selenium-75 has an activity of 3.0 mCi/mL. If 2.6 mCi are required for a leukemia test, how many m
oksian1 [2.3K]

Answer : The 866.66\mu L must be administered.

Solution :

As we are given that a vial containing radioactive selenium-75 has an activity of 3.0mCi/mL.

As, 3.0 mCi radioactive selenium-75 present in 1 ml

So, 2.6 mCi radioactive selenium-75 present in \frac{2.6mCi}{3.0mCi}\times 1ml=0.86666ml\times 1000=866.66\mu L

Conversion :

(1ml=1000\mu L)

Therefore, the 866.66\mu L must be administered.

4 0
3 years ago
What are 3 effects of nuclear radiation
aivan3 [116]

In a nuclear explosion the human body can be irradiated by at least three processes. The first, and most major, cause of burns is due to thermal radiation and not caused by ionizing radiation. Thermal burns from infrared heat radiation, these would be the most common burn type experienced by personnel.

8 0
3 years ago
Commercial agriculture can often lead to water-quality problems. In one to two sentences, explain how two of those problems occu
anygoal [31]

Commercial agriculture can often lead to water-quality problems in the following ways:

  • The washing of fertilizers and pesticides into water bodies from farms.

<h3>What is water quality?</h3>

Water quality refers to the state of a water body that encompasses it's physical, chemical and biological characteristics.

The water quality of a water body is crucial to its suitability for domestic or drinking purpose.

Commercial agriculture greatly affects water quality in the following ways:

  • The washing of fertilizers and pesticides into water bodies from farms.

Learn more about water quality at: brainly.com/question/20848502

#SPJ1

4 0
2 years ago
Consider this reaction:
Len [333]
Dilution of hcl because less no of mole of hcl would be reacting to form zncl2
3 0
3 years ago
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