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Elanso [62]
4 years ago
9

When precipitation falls in summer, sometimes wind pushes it back up into freezing temperatures before falling again. What will

most likely occur when this happens?
A.
hail will fall

B.
rain will fall

C.
sleet will fall

D.
snow will fall.
Chemistry
1 answer:
SVETLANKA909090 [29]4 years ago
3 0

Answer:

A

Explanation:

hail will fall push it back up making it bigger comes back down

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(I took a lucky guess, using some of my knowledge about elements )


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What is the empirical formula for a compound that is 24.7 % calcium, 1.20 % hydrogen, 14.8 % carbon, and 59.3 % oxygen? *
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Answer:

C_2H_2O_6Ca

Explanation:

Here we are given that the percentage of ,

  • Calcium = 24.7%
  • Hydrogen = 1.20%
  • Carbon = 14.8%
  • Oxygen = 59.3%

And we need to find out the Empirical formula of the compound .

  • Firstly divide the given percentage by the atomic mass of the compound . Here this is followed in the fourth column of the table , which will give the relative number of atoms .
  • Secondly , divide the value obtained by the smallest value among them .Say if we got the relative number of atoms as 4 , 3 and 2 , then divide all three numbers by 2 . ( followed in 5th column below .)
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Let's make a table ,

\boxed{\begin{array}{c|c|c|c|c} \underline{\bf Element} & \underline{\bf Percentage} & \underline{\bf Atomic \ Weight } &\underline{\bf No. \ of \ atoms_{relative} } &\underline{\bf Ratio } \\\\ \sf Ca & \sf 24.7 &\sf 40 &\sf \dfrac{24.7}{40}=0.6 &\sf \dfrac{0.6}{0.6}=1 \\\\\sf H &\sf 1.20 &\sf 1 &\sf \dfrac{1.20}{1}=1.20&\sf \dfrac{1.20}{0.6}=2\\\\\sf C &\sf 14.8 &\sf 12&\sf\dfrac{14.8}{12}=1.23&\sf \dfrac{1.23}{0.6}=2\\\\\sf O &\sf 59.3 &\sf 16 &\sf\dfrac{59.3}{16}=3.7&\sf \dfrac{3.7}{0.6}=6 \end{array}}

Therefore we got the ratio of Ca , H , C and O as 1:2:2:6 . Therefore the Empirical formula of the compund will be ,

\longrightarrow\underline{\boxed{\bf Empirical \ formula = C_3H_2O_6 Ca  }}

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