How many Joules of heat (enthalpy) is required to raise the temperature of 200 g of water from 20.0 0C to 50.0 0 C?

If two objects are made of the same material and are the same temperature what can be inferred about their sizes

What are the two most influential greenhouse gases in maintaining the earth's climate? A) carbon dioxide & silicon B) water vapor & carbon dioxide C) silicon & oxygen D) nitrogen & water vapor

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 =

The 3 in 4p3 represents: a. third energy level b. the number of electrons c. period 3 d. the third sub level e. Li

The barium isotope 133ba has a half-life of 10.5 years. a sample begins with 1.1*1010 133ba atoms. how many are left after (a) 5 years, (b) 30 years, and (c) 190 years?

Particles of matter how have both potential and kinetic energy is that true or false?

Visible light waves are part of the blank Spectrum

Why does a soccer ball stop rolling in a soccer game which newton law shows that?

What is the name of the compound PbS2 • 4H2O?

Why doesn't gravity pull water all the way to the center of the Earth?