A sample of an element has a mass of 34.261 grams and a volume of 3.8 cubic centimeters. To which number of significant figures should the calculated density of the sample be expressed?

(1) 5 (3) 3

(2) 2 (4) 4

An element the has a low first ionization energy and good conductivity of heat and electricity can be classified as A) metal B) metalloid C) nonmetal D) noble gas

What type of epithelium would be most suited for high levels of diffusion and filtration?

The temperature 30k expressed in degrees celsius is?

34. According to Bohr's theory, an electron's path around the nucleus defines its a. speed. c. atomic mass. b. electric charge. d. energy level

How many moles of lead, pb, are in 1.50 x 1012 atoms of lead?

Nonmetal oxides can react with water to form acids. For example, carbon dioxide reacts with water to form carbonic acid: CO2 H2O H2CO3. (1) Write an equation to show how diiodine pentaoxide reacts with water to form an acid. Do not include states.

If atmospheric pressure suddenly changes from 1.00 atm to 0.892 atm at 298 k, how much oxygen will be released from 4.40 l of water in an unsealed container?

Determine the molecular formula for the unknown if the molecular mass is 60.0 amu and the empirical formula is ch2o.

Draw the organic product of the following nucleophilic reaction

How does the energy of the activated complex compare with the energies of reactants and products? select one: a. it is lower than the energy of both reactants and products. b.