Which of the following is true about an atom of lithium and an atom of helium

Which subatomic particle has the smallest mass

If an element has 2 valence electrons, how many dots will be in the elements dot diagram?

Sulfur reacts with oxygen to form sulfur dioxide (SO2 (g), Delta. Hf = - 296.8 kJ/mol) according to the equation below. Upper S (s) plus upper O subscript 2 (g) right arrow upper S upper o subscript 2 (g).

For which of the following processes would there be a decrease in entropy

Which statement best describes the use of a catalyst in a fuel cell? It reduces waste. It lowers energy requirements. It reduces toxic exhaust. It increases reaction rates.

Choose one property of water that makes it unique. Describe the property and explain the chemical or physical?

An object is dropped onto the moon (g m = 5 ft/s 2). how long does it take to fall from an elevation of 250 ft.?

Which type of luster gives the mineral the appearance of metal?

Anything that contains only one kind of material?

One mole of propane (c3h8) gas reacts with five moles of oxygen (o2) gas to produce three moles of carbon dioxide gas (co2) and four moles of water gas (h2o).