If the change in concentration of a reactant has no effect on the initial rate of reaction, the order of the reaction with respect to that reactant is:

A) 0
B) 1
C) 2
D) unknown

Plz me get these answer dubble cheak ur answer plz ppl i need it right

What semimetal can form four single covalent bonds.

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.