AM LOOKING FOR A HEMISTRY TUTOR. CAN ANYONE HELP?
GRADE 11 IGCSE

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure