Which of the following statements is true about a compound? A compound is a mixed substance represented by a chemical formula

A compound is a mixed substance represented by a chemical formula

A compound is a pure substance represented by a chemical formula

A compound is a pure substance of two or more elements chemically combined and a
new substance is created

Initially, the balloon had 3.0 liters of gas at a pressure of 400 kpa and was at a temperature of 294 k. if the balloon is cooled to 277 k and its volume decreased to 1 l, what will the new pressure in the balloon be?

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity