How many protons are in Si-28

An atom with 82 protons, 125 neutrons and 78 electrons will have a mass number of

Using table 9.4, calculate an approximate enthalpy (in kj) for the reaction of 1.02 g gaseous methanol (ch3oh) in excess molecular oxygen to form gaseous carbon dioxide and gaseous water. (hint, remember to first write the balanced equation.)

A cyclist starts at rest and accelerates at 0.6m/s south for 20s. What's the cyclists final velocity

State the law of conservation of mass. This law applies to physical changes as well as chemical changes. With this law in mind, explain what happens to the mass of 18 mL of liquid water when it vaporizes to form about 22 L of water vapor.

Which earth layer is most dense

Chemical systems in nature tend to undergo changes toward

What energy drives the rock cycle that makes it work?

Who wants to hang out?

Atoms whose outermost energy level is not filled may gain or lose valence electrons. What do you call these atoms?

Which group 7 element has the most least for electrons