Conservation of Mass means:

A. Mass is gained in a chemical change

B. Mass is lost in a chemical change

C. Total mass of the chemicals doesn't change in a chemical change

D. Change in total mass depends on the type of chemical change

Which one of the following statements about solid Cu (face-centered cubic unit cell) is incorrect? A) It will conduct electricity. B) There are two atoms per unit cell. C) The number of atoms surrounding each Cu atom is 12.

How many moles are contained in 3.131 * 1024 particles? A. 5.199 mol B. 18.85 mol C. 0.5199 * 1023 mol D. 1.885 * 1047 mol

A student placed 13.5 g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask was reached.

The mass of a flask with a 1L volume that is evacuated to a pressure of 0.00 atm is found to be 92.01g. after introduction of an unknown ideal gas with a pressure of 3.

What is one similarity between radiation and conduction

Ice (H2O) melting at 273 K and 1 atm has = 6.01 kJ/mol and = 6.01 kJ/mol while water vaporizing under the same conditions has = 37.6 kJ/mol and = 40.7 kJ/mol. Why is there such a large difference between and, but not for and?

What happens to the charges when an ionic compound forms

We dissolve 93 grams of sodium sulfate (Na2SO4) in 20 grams of water. What is the percent by mass of sodium sulfate in this solution? Answer in units of %.

The modern atomic model includes electrons orbiting the nucleus. which of the following parts of dalton's atomic model was disproved by the discovery of the electron? - atoms are tiny particles. - atoms cannot be divided into smaller parts.

tandard reduction potentials are 1.455 V for the PbO2 (s) / Pb (s) couple, 1.82 V for Co3 (aq) / Co2 (aq), 3.06 V for F2 (g) / HF (aq), 1.07 V for Br2 (l) / Br - (aq), and 1.77 V for H2O2 (aq) / H2O (l).