Idenify the functional groups in this molecule. A: aromatic B: ketone C: ester D: :alcohol E: amines F: carboxylic acid Type the letters corresponding to all the correct answers in alphabetical orde

A compound containing \( 84.09 \% \) carbon and \( 15.91 \% \) hydrogen by mass. Determine the empirical formula of the compound.

Use solubility rules to predict whether precipitates will form when the following pairs of solutions are mixed. If a precipitate forms, write a full and net ionic equation for the reaction. Include the colour and states of reactants and precipitate. Note: if colour is not stated, assume it is colourless. (a) copper(li) sulfate and sodium carbonate

2. Wood burning in a fireplace is a: a) Chemical change b) Physical change

5. Which of the following is true about water: a) The liquid is less dense than the solid. b) The solid is less dense than the gas. c) The liquid is less dense than the gas. d) The solid is less dense than the liquid. e) None of the above

0.002 moll มาเดิมน้ำให้มีปริมาตรเป็น 5 เท่าของของเดิมจะมีค่า pH เป็นเท่าใด