How does a scientist explain something when a controlled experiment cannot be carried out

What happens to the reactants when a chemical reaction takes place? A. They all remain intact. B. They are destroyed, or consumed by the reaction. C. Their chemical bonds are broken and rearranged.

The partial pressures of CH 4, N 2, and O 2 in a sample of gas were found to be 183 mmHg, 443 mmHg, and 693 mmHg, respectively. What is the mole fraction of nitrogen?

Hydrogen atoms are excited by a laser to the n = 4 state and then allowed to emit. What is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system?

What are the main functions of estrogen and progesterone during the follicular and luteal phases?

Determine the number of molecules contained in 1 mole of sodium sulfate

Convert 3.57 moles of aluminum to grams

An average microwave uses a frequency of 2.54 GHz. How much energy is emitted?

Why scientist form a hypothesis

Step two of the procedure states: "Using sterile technique, place a loopful of inoculum from the M. luteus culture in the drop of nigrosin and mix." Which of the procedures qualifies as sterile technique?

If 4.34 moles of potassium react with excess water, how many moles of hydrogen gas would be produced at STP