which scientist proposed a modification to the theory of atomic number that esablished electron energy levels or shells

Two cups of coffee, one that is at 10°C and one that is at 20°C, are mixed. Which statement about the temperature of the mixture is correct?' A.

John's business installed a ramp at the loading dock to make it easier to accept deliveries. Unfortunately John has received many complaints that the ramp is worse than the stairs it replaced and makes it much harder bring in deliveries due to the

What happens to the reaction rate as the supply of toothpicks runs out?

The density of ice is 917 kg/m3. The density of salt water is 1029 kg/m3. A mass of ice is 2.55 x 1013 kg. Calculate the volume of salt water that has the same mass as 278 km3 of ice.

What term is used to describe the amount of energy it takes for 1 gram of a substance to be raised one degree in temperature? A) Specific energy B) Specific heat C) Specific mass D) Specific gravity

When does raising the temperature of a gas increase its pressure? A. temperature B. volume C. number of particles D. pressure

Hexyne. What does the name of this hydrocarbon tell you about its molecular structure?

Which of the following processes includes all of the others? Group of answer choices transport of an ion down its electrochemical gradient osmosis passive transport facilitated diffusion

How is the Bohr atomic model different from the plum-pudding model? A. In Bohr's model, the atom's mass is found at its center instead of distributed throughout. B. In Bohr's model, the atom's mass is mostly made up of electrons instead of protons.

What does the cell theory state? A. that cells come from other cells B. that cells come only from animals C. that cells cannot be created or destroyed