What is the molar mass for Mg3 (PO4) 2?

An atom of any element must contain

Determine the molarity of a solution prepared by dissolving 4.50 mol of nh4cl in sufficient water to make 2.00 l of solution.

Which reaction is single replacement? (1) 2H2O2 - - > 2H2O + O2 (2) 2H2 + O2 - - > 2H2O (3) H2SO4 + Mg - - > H2 + MgSO4 (4) HCl + KOH - - > KCl + H2O

Which statement about chemical reactions is not true? New atoms are formed as products. The starting substances are called reactants. The ways in which atoms are joined together are changed.

Explain the reactions with oxygen and explain reactivity with links to nuclear charge and shielding

Before a race, an athlete warms up by jogging around the track shown below at a constant rate of 2.3 m/s. What statement best describes his motion as he jogs around the curved part of the track?

What physical property is changed when a waitress pours coffee from a pot into four mugs? temperature density volume color

Calcule o calor especifico do estanho sabendo que foram necessarias 100 cal para elevar em 20ºC a temperatura de 100 g de estanho

What's the smallest part of a compound

The inertness of the noble gases is due to a. the outermost shell has six electrons. b. the bonds they form with other elements. c. the number of protons and neutrons. d.