Cody wanted to know how much heat was released from a reaction of steel wool and vinegar. He placed a thermometer inside a cup that held the steel wool and vinegar. He must decide whether to leave the cup open, as shown with Cup 1, or to cover the cup, as shown with Cup 2.

Which design would control the variables in this experiment to ensure accurate
temperature readings?
A) Cup 1. The thermometer can be read more accurately.
B) Cup 1. It will not trap the heat and alter the temperature readings.
C) Cup 2. The cover will control for any loss of heat from the top of the cup.
D) Cup 2. It will prevent fumes from escaping into the air.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

it is stable as it is in group 0 which have full outer shells of electrons

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole