Phase changes are chemical changes.

True

False ... ?

A chemical change is like a physical change because no new substance is formed. Agree or DIsagree and reason why

a ballon filled with helium contains 85L and 1.2 atm. the pressure is reduced to 0.22 atm at constant temperature. what is the new volume? given info: equation. work: answer

Electrochemical reactions and oxidation-reduction reactions are similar because they both: A. Involve the transfer of electrons. B. Must be spontaneous. C. Take place with all reactants in physical contact. D. Require an input of energy to occur.

How does atom electronegativity affect bond character and molecular polarity?

15) Ned Flanders mixed silver nitrate and sodium chloride. Immediately, Ned observed a white solid fall to the bottom of the beaker. He filtered and dried the solid and determined that it was silver chloride.

Which element has atoms that can form single, double, and triplecovalent bonds with other atoms of the same element? (1) hydrogen (3) fluorine (2) oxygen (4) carbon

Which of the following statements best describes the basic structure of an atom? Electrons and protons are in motion around a nucleus that contains neutrons Neutrons are in motion around a nucleus that contains protons and electrons Protons are in

Which of the following elements is released into the atmosphere by all of these processes: volcanic outgassing, animal respiration and flatulence, burning of fossil fuels, and metamorphism of limestone? a. Carbon. b. Nitrogen. c. Oxygen. d. Sulfur

A phase change from a solid to a gas is called what

What is the meaning of semipermeability?