What are examples of a chemical reaction? Select all that apply. A(2AgI + Na2S → Ag2S + 2NaI B)4FeS + 7O2 → 2Fe2O3 + 4SO2 C) H2O → SiO2 D)SnO2 → Sn + 2H2O

Which term best describes the form sound takes as it travels away from a drum (a- gas)(b-music) ( c-waves) (d-particles

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.

Can someone me with 3 and 4 plz. this is for masteries test.