Quem criou a teoria do átomo

The bottom of a box has a surface area of 2.50 m2. The mass of the box is 51.5 kg. Acceleration due to gravity at sea level is 9.80 m/s2. What is the pressure exerted by the box where it rests? 20.2 Pa 131 Pa 4.76 Pa 202 Pa

Consider the balanced equation 4NH3 + 3O2 - - > 2N2 + 6H2O What is the mole ratio of NH3 to N2? 2:4 4:2 4:4 7:2

Given the equation: I + I → I2 As the atoms of the iodine react to form molecules of iodine, the stability of the iodine (A). decreases (B). Increases (C). remains the same

Using the periodic table, choose the more reactive nonmetal. Te or O

What is the percent by mass of water in iron (ii) sulfate heptahydrate, feso4•7h2o (or what percent of the molar mass of feso4•7h2o is due to the waters of crystallization) ?

Most mutagens have what kind of an effect on an organism?

According to the hess's law, the enthalpy of solution is: δhsoln = δhsolute + δhsolvent + δhmix. considering dissolving a small drop of nonpolar pentane oil in water which term (s) in the equation will experience the largest enthalpy change.

Solve for x: ln x = 0.863. Report your answer to 3 significant figures.

What water activities might be easier to do in Lake Assal's salty water? What activities could be more difficult?

The suffix "-megaly in the term gastromegaly means: