The total amount of energy before and after a chemical reaction is the same. Thus, energy is A. conserved. B. created. C. destroyed. D. the same as mass.

Imagine that you have a metal bar sitting half in the sun and half in the dark. On a sunny day, the part of the metal that has been sitting in the sun feels hot.

A 29.0 kg iron weightlifting plate has a volume of 3680 cm3. What is the density of the iron plate in g/cm3?

Suppose that you have made a saturated solution of this solute using 56.0 g of water at 20.0 °c. how much more solute can you add if the temperature is increased to 30.0 °c?

A compound has the empirical formula CH2O. If the compound's molecular mass is 180 g/mol, determine the molecular formula of the compound. Be sure to show your work.

Select all of the answers that apply. what are the two main ingredients in air? oxygen carbon dioxide nitrogen helium hydrogen

Calculate the volume of a 0.323-mol sample of a gas at 265 K and 0.900 atm.

What is the molar mass of the following substance : Cs2CO3

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.