Which type of change can be reversed?

A.) a physical change

B.) a chemical change

C.) a molecular change

D.) an electric change

A 0.0200 gram piece of unknown alkaline earth metal, M, is reacted with excess 0.500 M H 2 SO 4, and the hydrogen gas produced is collected over water. The total gas pressure inside the collecting tube is 1.01 atm., the temperature 24.0 o C.

Socratic an example of an atom that has no charge is one that has a. 2 protons, 2 electrons, and 1 neutron. b. 1 proton, 2 electrons, and 3 neutrons. c. 3 protons, 1 electron, and 3 neutrons. d. 3 protons, 2 electrons, and 1 neutron.

Which prediction about a methane molecule would most likely be made by using both the quantum model of the atom and John Dalton's model? A. when the molecule reacts new atoms are created B. the molecule contains different kinds atoms C.

Manganese dioxide (MnO2 (s), Delta. Hf = - 520.0 kJ) reacts with aluminum to form aluminum oxide (AI2O3 (s), Delta. Hf = - 1699.8 kJ/mol) and manganese according to the equation below.

Which of the following elements is unique to nucleic acids when studying organic compounds? carbon hydrogen phosphorous oxygen

The balanced equation for the generation of sugar from sunlight water and co2 is

Isotopes of the same element have different ... A. Positions on the periodic table b. atomic numbers C. Mass number

How many moles of O2 are needed to make 1.98 moles of SO3

How many protons are in the nucleus of isotopes L?

What is the empirical formula for a compound that contains 38.77% Cl and 61.23% O?