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RUDIKE [14]
3 years ago
13

Who arranged the elements according to atomic mass, and used the arrangement to predict the properties of missing elements.

Chemistry
2 answers:
Karolina [17]3 years ago
6 0

Answer:

i think it's C

Explanation:

But if it's wrong,im so sorry

Verdich [7]3 years ago
5 0

Answer:

C.

Explanation:

the answer is C dmitri mendeleev

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0.0009547863= x^-1.644
Andrej [43]

Answer: 68.71317831

Explanation:

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A student took a calibrated 250.0 gram mass, weighed it on a laboratory balance, and found it read 266.5 g. What was the student
marta [7]

Answer:

\boxed{\text{6.60 \%}}

Explanation:

\text{Percent error} = \dfrac{\lvert \text{Measured - Actual}\lvert}{ \text{Actual}} \times100 \,\%

\text{\% error} = \dfrac{\lvert 266.5 - 250.0\lvert}{250.0} \times 100 \, \% = \dfrac{\lvert 16.5\lvert}{250.0} \times 100 \, \% = \dfrac{16.5}{250.0} \times 100 \,\%\\\\ = 0.0660 \times 100 \, \% = \textbf{6.60 \%}\\\text{The student's percent error is $\boxed{\textbf{6.60 \%}}$}

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What 4 elements did people originally think made up everything?
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Dafna1 [17]

Solution :

An $\text{aldol condensation}$ reaction is a type of \text{condensation reaction} in organic chemistry where the enol or an enolate ion reacts with the carbonyl compound and forms a $\beta$-hydroxyaldehyde or a $\beta$-hydroxyketone, and then followed by a dehydration to give conjugated enone.  

Benzaldehyde reacts with methylketone and forms two products:  

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