To run a thin layer chromatography experiment with a chemical substance, begin by marking a horizontal line near the bottom of a TLC plate with . Place a spot of the substance onto the line. For the mobile phase, add a small amount of at the bottom of a TLC chamber. Place the plate in, then the chamber. Once the mobile phase approaches the top of the plate, remove the plate and mark the line. Note the position of the spots and calculate Rf values if needed. A. Options for blank 1: pen, pencil
B. Option for blank 2: large, small
C. Options for blank 3: solvent, solid
D. Options for blank 4: cover, shake
E. Options for blank 5: starting, solvent

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  d.landing on and exploring the moon4. which of these space missions involved the deployment of lunar rovers d.apollo5. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar systemb.safir7.which technology limit the future of space exploration b. scientist must first develop certain technologies before missions can be completed.