A pound is approximately 0.45 kilogram. A person weighs 87 kilograms. What is the person's weight, in pounds, when expressed to the correct number

of significant figures?

A.

190 lb

B.

180 lb

C.

52 lb

D. 39 lb

How many milliliters of a 2.5 M LiOH solution are needed to completely neutralize 25 mL of a 1.0 M H2SO4 solution?

What is one of the by products of using a cooling system?

Given the following proposed mechanism, predict the rate law for the overall reaction. 2 NO2 + Cl2 → 2 NO2Cl (overall reaction) Mechanism NO2 + Cl2 → NO2Cl + Cl slow NO2 + Cl → NO2Cl fast

At which temperature is the vapor pressure of ethanol equal to 80. kPa? (1) 48°C (3) 80. °C (2) 73°C (4) 101 °C

a student determines the mass of a 100 mL beaker filled with 50 mL of water to be 154.34 grams. After a tablet reacts with the water, the mass including the dissolved tablet is 157.26 grams. Show the work and find the mass gained below.

What happens to the velocity of a sound wave in air if the temperature of the air increases

Determine the [oh-] concentration of a 0.741 m koh solution at 25°c.

In the lab, students decomposed a sample of calcium carbonate by heating it over a Bunsen burner and collected carbon dioxide according to the following equation: CaCO3 (s) CaO (s) CO2 (g) (a) How many mL of carbon dioxide gas were generated by the

J. J. Thomson A) Electrons are in orbital levels. John Dalton B) Atoms are the smallest unit of an element. Ernest Rutherford C) Electrons are scattered within the atom. Niels Bohr D) Protons are at the center of an atom.

Which answer best describes an alloy