Explain the difference between a) constant and proportional error. b) absolute and relative error. c) population mean and sample mean d) quantitative and qualitative analysis in analytical measurement.

How much energy is consumed by thawing 4.3 g ice? O A. 4.3 g x 1 mol/18.02 g 6.03 kJ/mol B. 4.3 g x 1 mol/18.02 g x 4.186 kJ/mol C. 4.3 g x 1 mol/18.02g x 40.65 kJ/mol D. 4.3 g x 1 mol/18.02 g * (-285.83) kJ/mol

Para balancear una ecuacion quimica se cuenta el numero de:

The initial concentration of reactant in a first-order reaction is 0.27 m. the rate constant for the reaction is 0.75 s-1. what is the concentration (mol/l) of reactant after 1.5 s?

At constant pressure, a sample of gas occupies 420 mL at 210 K. What volume does the gas occupy at 250 K?

Most immigrants from the 1820 to 1850 came from which two countries? France and the United Kingdom Ireland and Germany Ireland and France Germany and the United Kingdom

Chromium 6 is commonly referred to as?

How does a parallel circuit differ from a series circuit? A. A parallel circuit had one path for electrons, but a series circuit has more then one path. B. A series circuit has one path for electrons, but a parallel circuit has more then one path. C.

Which of the following is an example of potential energy? -none of the above -A person jumping on a trampoline -a book on the shelf -A person running in place

One atom of silicon can properly be combined in a compound with a. three atoms of hydrogen. b. four atoms of calcium. c. two atoms of oxygen. d. one atom of chlorine.

How many carbon atoms are present in a mole of 12C?