Question

Bunsen burner is opened (providing sufficient Or), which of the Tollowing 5. When the air hole in correct A. The gas burns efficiently, producing a very hot blue flame B. The gas does not burn well, producing a very hot, blue flame C. The gas burns efficiently, producing a relatively cool, yellow flame D. The gas does not burn well, producing a relatively cool, yellow flame 6. The substance does not loss its chemical composition after carrying out a Chemical prosperities B. Physical prosperities C And B D. None of all 7. Which of the following is not evidence of a chemical process (chemical reaction)? A Separation of dissolved sodium chloride from water B. Dissolution of the copper wire C Precipitation of solid copper D. The bubbling observed upon addition of magnesium and hydrochloric acid & According to the boiling point experiment, which statement is correct? A Boiling point is inversely proportional to the atmospheric pressure and intermolecular forces B. Boiling point is normally measured for solid samples C Temperature is the holling point when liquid just enters the capillary tabe D. All the above 9. In the boiling point experiment, if the stream of air bubbles is rapidly escaping from the open end of the capillary tube. Then the vapor pressure of the liquid is A. Equal the atmospheric pressure B. Higher than the atmospheric pressure C Lower than the atmospheric pressure D. None of all 10. The observation which is chtained from mixing sodium hydroxide solution and ammonium chloride solution is: A No reaction at all B. Gas without odor C. Ammonium grs with odor D. White precipitate formed