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mr_godi [17]
3 years ago
11

Which of the following are observations? Select all that apply.

Chemistry
1 answer:
alexdok [17]3 years ago
8 0

Answer:

A and E

Explanation:

Observing means looking or watching with the eyes etc..

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An experiment was designed to test the hypothesis that peanuts have more energy than a chip. The experiment determines calorimet
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b Different amounts of food samples were used.

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The mass of the two samples needs to be the same in order for the test to be accurate.

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What is the name of the binary molecule H2O2? This compound is also known as hydrogen peroxide and is a properly disinfectant or
Masteriza [31]

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hydrogen dioxide

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A piece of asphalt has a volume of 5.0 cm3 and a mass of 7.5 g. What is the density of the asphalt?
strojnjashka [21]
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6 0
3 years ago
He following balanced equation shows the formation of water. 2H2 + O2 mc020-1.jpg 2H2O How many moles of oxygen (O2) are require
mrs_skeptik [129]

Answer : The correct option is, 13.7 mole

Solution : Given,

Moles of H_2 = 27.4 moles

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2H_2+O_2\rightarrow 2H_2O

From the balanced chemical reaction, we conclude that

As, 2 moles of H_2 react with 1 moles of O_2

So, 27.4 moles of H_2 react with \frac{27.4}{2}=13.7 moles of O_2

Therefore, the number of moles of oxygen O_2 required are, 13.7 moles

7 0
3 years ago
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If you don't know all the answers just answer the ones you do know and number them so I know which one you are answering
BlackZzzverrR [31]
2. answer is C.<span> Elements have the same physical and chemical properties in any period </span>
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