Ernest rutherford's gold-foil experiment showed which of the following? . a. the existence of electrons in an atom. b. the existence of a dense, positively charged center in an atom. c. the existence of subatomic particles with no charge in the nucleus. d. the existence of subatomic particles within an atom.

Look at the bean data from days 4–6. use these data to explain how natural selection changed the number of dark red walking beans over time. writing part

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?