What is one example of the use of an infrared sensor? a. bar code scanner tracks store inventory. b. information is relayed to a visually impaired individual about the location of objects. c. monitoring feed for farm animals to keep them healthy. d. detecting the presence of humans trapped under collapsed buildings.

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation

Chromium(iii) sulfate is a transition metal compound containing the metal chromium and the polyatomic ion sulfate. the oxidation state of chromium in this compound is , and the chemical formula of the compound is ( ) . reset next

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ