Which of the following observations indicates that atoms of all elements contain small, negatively charged particles? A) Alpha particles are repelled by cathode rays of elements

B) Cathode rays are deflected towards a positively charged rod

C) a particulat frequency of light is produced by a gas in an excited state

D) certain areas of the atom called orbitals contain all the charged particles

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Answer explain why it is not possible to deduce a complete order of reactivity.

What volume of a 0.0606 m solution of strontium bromide is needed to obtain 0.340 mol of the compound? question 42 options: a)5.61 l b) 3.4 l c) 600 ml d) 1 l e) 178 ml