7. When substances are combined to form a mixture, they A. keep their original properties
B. form new chemical bonds
C. form a new compound
D. cannot be separated physically

Does the energy in a solid increase or decrease when changing to a liquid?

Match the following items. 1. high-intensity bundle of energy being emitted from some decaying nuclei gamma ray 2. particle radiating from the nucleus of some atoms beta particle 3. negative particle identical to an electron but radiating from a decaying nucleus alpha particle

(1.6 × 10-19)(5.0 × 106) = c × 10d identify the missing numbers below to show the result of multiplying the numbers.