What 2 things do the planets need to have in order to stay in orbit and rotate?

A match has about 21 milligrams of red phosphorus coating the tip. How many atoms of phosphorus is this?

How is electrolysis most commonly used to produce an energy source? Splitting water molecules produces oxygen, which organisms breathe to fuel their bodies.

Beryllium (Be) and fluorine (F) combine to make the compound BeF2. What is the chemical name for this compound?

Which of the following concerning solutions is/are correct? 1. The solvent in a mixture of gases is generally considered to be the substance in greater amount. 2. The solid dissolved in a solution is known as the solute. 3.

Why do you cool down tea extract in ice to below 40°c before adding dichloromethane?

The atomic mass of carbon is 12.011 g/mol. how many atoms of carbon have that exact mass? why?

Which option is true about the effect of polarity on solubility? Select all that apply. Polar solutes dissolve better in water than in oil. Polar solutes have the greatest solubility in nonpolar solvents.

Which change results in a release of energy? 1. The melting of H₂O (S) 2. The boiling of water (L) 3. The evaporation of H₂0 (L) 4. The condensation of H₂0 (G)

What changes nitrogen gas in the air to nitrogen compounds that fall to the ground

Which element has an isotope mass number of 32 and is used as an ecological tracer?