You weigh three samples of the same metal, and find their masses to be 41.40 g, 37.22 g, and 43.46 g. the corresponding volumes are 4.5 ml, 4.3 ml, and 4.8 ml. what is the density, d, of the metal?

Why is only one molecule of N2 needed to produce 2 molecules of NH3?

1. Directions: Select each correct answer. Biotic factors of an ecosystem could include which of the following? A. all types of plants B. the quantity of water available C. the temperature range D. all animal populations

Solids, liquids, and gases can be distinguished by their

Soaps feel slippery on our hands because they dissolve the oil on our skin, decreasing friction. This is because soap contains ... A) A neutral molecule. B) A salt molecule C) An acid D) A base.

Which of the following describes the Bohr atomic model? A. Protons, neutrons, and electrons orbit around each other in set paths. B. The nucleus contains protons and neutrons and is orbited by electrons. C.

Fluorine-18, which has a half-life of 110 min, is used in PET scans. a. If 100. mg of fluorine-18 is shipped at 8:00 a. m., how many milligrams of the radioisotope are still active after 110 min? b. If 100. mg of fluorine-18 is shipped at 8:00 a. m.

The reaction of methane with water to form carbon dioxide and hydrogen is non - spontaneous at 298 k. at what temperature will this system make the transition from non-spontaneous to spontaneous? the data refer to 298 k.

The sedimentary rock formed when water deposits tiny particles of clay in very thin flat layers is called? a. gymsum b. shale c. limestone d. calcite

What change into velocity

Would you expect the h atoms to remain bonded to each other, or would the molecule fall apart?