Which of the following is not a sign that a chemical change has occurred?

-Change in energy

-Change in mass

-formation of precipitate

-Change in color

What does Avogadro's number represent? the number of atoms in 12 grams of the isotope carbon 12 the number of atoms in 120 grams of the isotope carbon 12 the number of atoms in 1 kilogram of the isotope carbon 12 the number of atoms in 1 gram of the

What contains huge, floating rafts of algae. A. inter tidal area B. coral reef C. estuary D. Sargasso sea E. polar ice F. marsh G. swamp

In the alpha decay of Francium-221, what daughter element is produced?

How many moles is 362.8 g C5H12?

When a voltaic cell operates, ions move through the (1) anode (2) cathode (3) salt bridge (4) external circuit

What are the chemical components of a dna molecule?

Which type of reaction is described by the following equation? Na2O (s) + 2CO2 (g) + H2O (g) produces 2NaHCO3 (s)

According to Hund's Rule, if you were filling the three orbitals at the 2p energy level, you would first put an electron in the 2px orbital, then in the 2py orbital, and then in the 2pz orbital;

It is snowing where Jenna lives. It's been snowing all day, but now the snow has changed to sleet and then to freezing rain. What is happening to cause these changes?

Liquid sample a has a higher vapor pressure than liquid sample b (both in closed containers). what can be said about sample a compared with sample b?