Which of the following is a chemical change?

A: boiling of water

B: melting a cube of ice

C: dissolving 10 grams of salt in water

D: splitting water into hydrogen and oxygen

A sample of gas occupies 6 ml at stp. at what pressure would this sample occupy 500 ml if the temperature is changed to 525◦c? answer in units of torr.

What is a possible quantum number set for an electron in the 2s orbital of a beryllium (Be) atom?

Identify which method of thermal energy transfer would be fastest through a vacuum, which would be fastest through a gas, and which would be fastest through a solid. 142

An easy way to assign the number of d-electrons (the “d count”) in a transition metal ion is to first look at the periodic table and take note of which group the element is in.

Describe the current model of the atom and the characteristics of each of the 3 subatomic particles. Be prepared to provide the number of protons, neutrons and electrons for a given element.

Which of the following statements best describes the basic structure of an atom? Electrons and protons are in motion around a nucleus that contains neutrons Neutrons are in motion around a nucleus that contains protons and electrons Protons are in

Which of the following elements is released into the atmosphere by all of these processes: volcanic outgassing, animal respiration and flatulence, burning of fossil fuels, and metamorphism of limestone? a. Carbon. b. Nitrogen. c. Oxygen. d. Sulfur

A phase change from a solid to a gas is called what

What is the meaning of semipermeability?

What type of reaction does Fe+Ag2SO4-FeSO4+Ag