Time passed Time passed 14C initially present 14C at end of half-life
(half life) (Years)
........................................................................................................................
0 0 1,000,000 1,000,000
1 5750 ..... 5,00,000
2 11500 ..... 2,50,000
3 17250 ..... 1,25,000
4 23000 ..... 62,500
Since, wood sample contained 1/16 of current atmospheric concentration of 14C. It means that sample has crossed 4 half-life. Number atoms left are 4 half life = 62,500
THE The answer is B MARK BRAINIEST
Neon. Neon is a gas that glows red-ish when electricity flows through it in neon signs etc.
Answer:
The drinks that the student should avoid - if he wants to avoid damage to his teeth - are drinks C and E, since they are acidic, according to their pH.
Explanation:
pH measures the acidity or alkalinity of a solution, taking into account the amount of hydrogen ions present in it, and established on a scale that goes from 0 to 14.
In chemistry, pH is derived from the formula that indicates:
<em>pH = - Log₁₀ αH⁺</em>
, where α is the activity of hydrogen ions.
A solution with a pH of 7 is considered neutral, above this value it is an acidic solution and below this value it is called acidic.
According to this:
- <em>Acidic drinks are: drink C (5.3) and E (2.4).</em>
- <em>The basic drinks are: drink A (11.9) and drink D (9.8).</em>
- <em>The neutral drink is the drink B (7), which corresponds to water.</em>
Answer:
Six atoms of calcium, four of phosphorous and sixteen of oxygen for a total of twenty six
Explanation:
Hello there!
In this case, according to the molecular formula of the two moles of calcium phosphate:
Thus, in order to calculate the atoms of each atom, it is necessary to multiply the two in front of the formula by the subscripts in the reaction:
Thus, we obtain six atoms of calcium, four of phosphorous and sixteen of oxygen for a total of twenty six.
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