Which of these is an indication that a chemical reaction has occurred? A. Melting of a substance B. Boiling of a substance C. Formation of a gas D. Freezing of a substance

How is a pure substance different from a mixture? a.) mixtures cannot be separated by physical means b.) mixtures are made up of more than on component c.) a pure substance is heterogeneous d.) pure substance are separated by physical means

What is one source of organic matter in soil?

Which organisms in a population produces more offspring than can survive this is called

Use Gay-Lussac Law to solve. When the pressure of a balloon starts at 7.5 atm and the temperature surrounding the balloon goes from 65 C to 32 C, what would be the end pressure.

Write A balanced equation showing the formation of copper (II) nitrite from its elements

How do metallic bonds differ from covalent and ionic bonds

Will ag2so4 precipitate when 100 ml of 5.0*10-2 m agno3 is mixed with 10 ml of 5.0*10-2mna2so4 solution?

How many grams of H₂ are produced with the reaction of 36 grams of water? 2 Na + 2 H20 - > 2 NaOH + h2

Which statement is the best description of a chemical bond? A. A chemical bond connects 2 different molecules. B. A chemical bond holds atoms together. c. A chemical bond turns molecules into atoms. D. A chemical bond identifies atoms in a molecule.

The energy of an electron varies depending upon which energy level that electron occupies. True or False.