Which phrase describes air density?

increases as altitude increases

equals mass divided by volume

pushes molecules in one direction

exerts less pressure as it increases

Which conclusion was drawn from the results ofthe gold foil experiment? (1) an atom is electrically neutral. (2) an atom is mostly empty space. (3) the nucleus of an atom is negativelycharged.

what tool do you have to use to precise amount of water? A meter stick B stopwatch C balance D graduated cylinder E beaker F thermometer

What scientist determined that atomic mass did not determine the pattern of the periodic table? A. James Watson B. Henry Moseley C. Rosalind Franklin D. Dmitri Mendeleev

What do two different neutral isotopes of the same element have in common?

3. How many milliliters of water are there if the mass of the water is 34.228 g at STP?

Calculate how many moles of glycine are in a 160.0-g sample of glycine. express your answer using four significant figures.

Which of the following words correctly describes CO2? Select all that apply A. Its a substance b its a compound c its a element D its a mixture

A certain reaction has an activation energy of 51.64 kj/mol. At what temperature Kelvin will the reaction be 5.50 times faster than it did at 343K?

What allows electrons to flow between electrodes in an electrochemical cell? a - conducting wire b - salt bridge c - electrolyte solutions d - battery

How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen? 1 mol of oxygen has fewer molecules. 1 mol of oxygen has more molecules. Each sample has the same number of molecules.