Your teacher asks you to follow the instructions in a lab to produce several known chemical reactions. during these procedures, you are required to record any observations that suggest chemical reactions have occurred. which of these list of observations best describes evidence of chemical reactions? a) a liquid melts and becomes a solid. b) when heated steam comes out of a test tube. eliminate c) a gas or solid is formed from two liquid solutions. d) the two chemicals separate and form two distinct layers.

Which of the following steps is not likely to take place during cellular respiration? (5 points) select one: a. oxygen combines with carbon of simple sugar. b. energy molecule transfers energy to cells. c. simple sugar breaks down. d. energy is used up.

Which of the following changes would increase the molar concentration of the products in any chemical reaction atequilibrium?

Suggest which functional groups are responsible for the reactions with(i) sodium,(ii) bromine water(iii) alkaline aqueous iodine.(3 marks)(iv) suggest structures for x and y.(1 mark)(b) one molecule that has been found in the dust clouds is hydroxyethanal: hoch2cho.name the two functional groups present in this compound.(2 marks)(c) but-1-ene, ch3ch2ch=ch2, is an important compound in the petrochemical industry.some reactions of but-l-ene are given below. in each empty box, draw the structural formulaand write the name of the organic compounds formed.