In the bohr model of the atom, the ground-state electron in hydrogen has an orbital speed of 2190 km/s. the mass of an electron is 9.11*10-31kg. what is its kinetic energy?

Which phrase describes the movement of the continents? only coming together only moving apart coming together and moving apart not moving; always in one solid land mass

Methanol burns in oxygen to form carbon dioxide and water. part a write a balanced equation for the combustion of methanol. write a balanced equation for the combustion of methanol.

What is the force of gravity dependent on

Paige heated 3.00 g mercury (II) oxide (HgO, 216.59 g/mol) to form mercury (Hg, 200.59 g/mol) and oxygen (O2, 32.00 g/mol). She collected 0.195 g oxygen. What was the percent yield of oxygen?

A "fizz saver" pumps air under pressure into a soda bottle to keep gas from escaping. will this keep co2 in the soda bottle? explain your answer.

What would you measure a cooking pot by

Is pancakes cooking on a griddle a physical or chemical change?

To determine whether a shiny gold-colored rock is actually gold, a chemistry student decides to measure its heat capacity. She first weighs the rock and finds that it has a mass of 4.7 g. She then finds that, upon absorption of 52.

In most Acid-base reactions, what type of bond (ionic or covalent) is formed between the ions of the "salt"? What happens to the electrons in this sort of bond? Are they transferred, or shared?

Many trials are not needed before a hypothesis can be accepted