The correct answer would be D. Ca^2+ has 18 electrons. This is because 2+ means that 2 electrons have been removed, and Ca starts out with 20 electrons. As 20 - 2 = 18 electrons, D is the correct answer.
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Answer:
The sum of the number of protons and neutrons in an atom is called the mass number.
Explanation:
Carbon-12 has 12 protons and 12 neutrons. 12+12=24 , so the mass number of C-12 is 24..
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Ca(OH)₂ = Ca²⁺ + 2OH⁻
[OH⁻]=2c{Ca(OH)₂}
pH=14+lg[OH⁻]
pH=14+lg(2c{Ca(OH)₂})
pH=14+lg(2*0.0075)=12.18
Answer:
Conceptual energy modeling does not produce the same accurate results as energy modeling with building elements
Option B is true , the same number of moles of solute in both solution is the same.
<h3>What is Molarity? </h3>
Molarity is the ratio of no of moles as per liter solution. It is denoted by M and SI unit is also M or moles/litre.
Molarity = no . Of moles/Volume (L)
In this question the amount of solution is increased means the volume is increased from 500-700ml it is increased , Molarity is inversly proportional of Volume
it will decrease if volume increase. Adding water do affect the concentration of the solution. The no. Of moles of solute remains because there no increament in amount of NaCl .
Hence ,option B is more correct
to learn more about Molarity click herehttps://brainly.com/question/27931587
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