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KATRIN_1 [288]
3 years ago
9

Question 2(Multiple Choice Worth 4 points) (01.01 MC) Dominic and Eva are using the same type of stopwatches to measure the time

it takes for a chemical reaction to occur. They each use the same stopwatch to measure the time. These are their results: Person Trial 1 Dominic 78 seconds Eva 81 seconds Why are their results unreliable and can lead to a pseudoscientific claim? They did not repeat their tests multiple times. They used the same type of stopwatch. They did not change the reactants in their chemical reactions. Only one person should have collected the data.
Chemistry
2 answers:
LekaFEV [45]3 years ago
6 0
The results of Dominic and Eva's experiment is unreliable and can lead to a pseudoscientific claim primarily because they did not repeat their tests multiple times. Although, they used the same type of stopwatch in recording the time it takes for the chemical reaction to occur, they have different reactions times. Thus, it would have been better if they conducted several trials then obtained the average of their results.    
Masja [62]3 years ago
5 0

Answer:

The correct answer will be option-they did not repeat their tests multiple times.

Explanation:

Pseudoscience or the false science is the scientific practice which is based on the belief system and has no supported evidences.

The pseudoscience facts cannot be verified with the scientific methods which includes the logical questions, hypothesis and results produces through the repeated experiment.

In the given question, Dominic and Eva performed experiments using same stopwatch to note the time of a chemical reaction but they recorded different time period for the same chemical reaction.

This could lead to discrepancies or errors in the results  and formation of conclusion. So experiment must be repeated to avoid the errors which the experimental method lacked.

Thus, the selected option is the correct answer.

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A 20.00 ml sample of a solution of sr(oh)2 is titrated to the equivalence point with 40.03 ml of 0.1159 n hcl. what is the molar
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The   molarity  of Sr(OH)2  solution is  =  0.1159 M

    calculation
write the equation  for reaction
that is,  Sr(OH)2 +2HCl→ SrCl2 + 2 H2O

then finds the mole  of HCl used

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Predict: Will a 1500 kg car moving at the same speed as the tennis ball have
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erik [133]
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5 0
3 years ago
What is the bond dissociation energy for breaking all the bonds in a mole of o2 molecules?
djverab [1.8K]
<h3>Answer:</h3>

498 kj/mol

<h3>Explanation:</h3>
  • Chemical reactions occur as a result of bond breaking and bond formation.
  • The bonds in reactants are broken and atoms are rearranged to form new bonds.
  • During bond breaking energy is absorbed to break the bonds of reactants while bond formation involves the release of energy during the formation of new bonds.

In our case;

In 1 mole of the Oxygen molecule, there is one O=O bond

Energy absorbed to break O=O is 498 kJ/mol

Therefore, the ΔH required to break all the bonds in one mole of Oxygen(O₂) molecules is 498kJ/mol.

Note that, bond breaking is endothermic since energy is absorbed  from the surroundings.

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