Huan wants to enter the science fair at his school. He has a list of ideas for his project. Which questions could be
answered through scientific investigation? Check all that apply.
Does pressure have an effect on the volume of a gas?
Which physicist was the smartest?
Is the information on the periodic table difficult to understand?
Which brand of soap is the best for cleaning grease off dishes?
Which laboratory experiment is the most fun to perform?

The questions that can be answered by science must be empirical, that is they must be answerable by experiments.

The question that can be answered by science is; Which brand of soap is the best for cleaning grease off dishes?

This question can be answered by using various brands of soap to clean the same type of dish with the same type of grease and comparing the results. The answer to this question is pure empirical.

The other questions listed can not be answered by experiment. Their answer may vary from person to person therefore they are not scientific questions.

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in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :