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

What does heat and pressure have to do with the rock cycle?

A scientist finds a fossil that contains a long beak. He can assume which of the following things?

What word describes the eye of a hurricane?

Lonic bonds show which characteristics that aren't seen in covalent bonds? A. Electronegativity values between the two atoms are low. B. One atom is a metal, and one is a nonmetal. C. Atoms are both from the nonmetal groups. D.

Can the ph scale be utilized for all acids (Arrhenius, Bronsted-Lowery, and Lewis) ? Explain reasoning.

Energy stored in the bonds that hold together the atoms and molecules of all substances is called Energy stored in the bonds that hold together the atoms and molecules of all substances is called

Which of the following requires an oxidizing agent? Al yields Al3+ 2 O yields O2 Cl2 yields 2 Cl- Ag + yields Ag

If a color change occurs when two solutions are mixed has a chemical reaction likely occurred?

Using the following thermochemical data, what is the change in enthalpy for the following reaction? Ca (OH) 2 (aq) + 2HCl (aq) → CaCl2 (aq) + 2H2O (l) CaO (s) + 2HCl (aq) →CaCl2 (aq) + H2O (l), ΔH = - 186kJ CaO (s) + H2O (l) →Ca (OH) 2 (aq), ΔH =

1. Calculate the end velocity of a rocket that traveled 16km in 2 seconds. distance time 2. Calculate the rockets acceleration m with a start velocity of 0m/s and the end velocity from #1 for 10 seconds.