Which scientist offered proof that atoms exist?

a. Aristotle

b. Democritus

c. John Dalton

d. Isaac Newton

Which statement is most consistent with the plum pudding model of the atom? 1) Electrons occupy regions of space 2) Negative particles orbit a positive nucleus 3) The atom consists of mostly empty space 4) Negative particles are embedded in atoms

A patient needs to be given exactly 500 ml of a 5.0% (w/v) intravenous glucose solution. the stock solution is 35% (w/v). how many milliliters of the stock solution are needed to prepare the fluid for the iv bag?

A molecule that dissociates in water and gives off hydrogen ions is

Using the equation, c5h12 8o2 → 5co2 6h2o, if 108 g of water are produced, how many grams of oxygen were consumed?

True or False? Elements in the same column have the same number of valence electrons.

Evaluate - if you put a scale in an elevator and weigh yourself as you ascend and the descend, does the scale have the same reading in both instances?

Why would you add a catalyst to something

A sample of the sugar d-ribose (C5H10O5) of mass 0.727 g was placed in a calorimeter and then ignited in the presence of excess oxygen. The temperature rose by 0.910 K. In a separate experiment in the same calorimeter, the combustion of 0.

the volume of an ideal gas in a container is 2.0 L what will be the volume of the gas if the pressure on the container is doubled while the temperature is reduced from 400 K to 200 K

Which of the Following Will result in increasing temperature of s gas