Which of the following statements is true?

the periodic table is organized in order of atomic number.
elements in the same period have similar properties.
substances in a mixture lose their unique properties.
heterogenous mixtures are also called solutions.

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.

Compare and contrast physical changes with chemical changes.

What is the most important factor in determining climates.