I don’t know what plant were presented in your lesson. So, I did sunflowers. The tropism I used was photo tropism
Answer: > > >
Explanation:
Isoelectronic specie are defined as the molecules which have the same number of electrons.
Atomic number of calcium is 20 and thus has 20 electrons. is formed by loss of 2 electrons and thus has 18 electrons.
Atomic number of potassium is 19 and thus has 19 electrons. is formed by loss of 1 electron and thus has 18 electrons.
Atomic number of chlorine is 17 and thus has 17 electrons. is formed by gain of 1 electron and thus has 18 electrons.
Atomic number of phosphorous is 15 and thus has 13 electrons. is formed by gain of 3 electrons and thus has 18 electrons.
As the number of electrons are same , the more is the nuclear charge i.e. the number of protons , more will the force of attraction towards the nuclei and thus smaller will be the radii and vice versa.
Thus, order of decreasing ionic radii for the given ions is as follows.
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Answer:
D. 6.3 x 10-5 mol/L NaOH
Explanation:
Alizarin yellow is an indicator that is yellow when pH < 10.1. In the same way, thymol blue is blue when pH > 9
That means the pH of the solution is between 9 - 10.1
Any acid as HCl could have a pH of these.
The solution of 3.2x10⁻⁴M NaOH has a pH of:
pOH = -log[OH-] = 3.49
pH = 14-pOH = 10.51. The pH of the solution is not 10.5
Now, the solution of 6.3x10⁻⁵M NaOH has a pH:
pOH = -log[OH-] = 4.2
pH = 14-pOH = 9.8
The pH of the solution could be 9.8. Right option is:
<h3>D. 6.3 x 10-5 mol/L NaOH</h3>
Answer:
According to the equation below salt is produced by BaH2s
The correct answer is a descriptive investigation.
An investigation which does not involve hypotheses called descriptive investigation.
Hypotheses are termed as scientific hypotheses and require that one can test it. In hypothesis, previous observation can not satisfactorily be explained with an available scientific theory.
Working hypotheses are being proposed for further research.