Acompound contains two or more   (this is earth science) a. elements chemically combined b. simple substances c. protons combined with electrons d. elements physically combined

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

Condensation happens when water vapor cools. true or false? ?