Who reported four "element" classifications, but included some substances that were combinations of elements rather than true elements in his listing? henry moseley dmitri mendeleev antoine lavoisier johann dobereiner

According to the law of conservation of matter, which chemical equation represents a possible chemical reaction? A. C + 2H2 CH4 B. 2H2 + O2 NH3 C. 2Al2O3 2Na2O D. N2 + 3H2 P4O10

When you overshoot during titration what is the result

Bromine is less electronegative than chlorine, yet methyl bromide and methyl chloride have very similar dipole moments. why? select the single best answer.

Give a everyday-life example of percentage yield (not popcorn)

A student is quickly pipetting 129ul water and observes many bubbles in the tip. You as the second student demonstrate the correct order of steps: 1. In order to prevent bubbles, slowly let go off your thumb and release the pushbutton to aspirate. 2.

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

What is the common name of sodium bicarbonate