How has scientists' understanding of the atoms changed over time?

Suppose a log'smassis 5 kg after burning the mass of the ash is 1 kg explain what may have happened to the other 4 kg of mass

Why is Fluorine more reactive than Bromine?

How many moles of h2o are produced when using 7 moles of h2

How many valence electrons does strontium (Sr) have?

The ideal gas law equation is PV = nRT. If n, R, and T are kept constant, what happens to the volume if pressure is increased? A) The volume increases B) The volume decreases C) The volume remains unchanged D) The temperature rises

Which is a characteristic of super-absorbent polymers? When they absorb water, they become gels. They bind to water in stoichiometric ratios. They have a single water-absorbing monomer per molecule.

A plant converts light energy from the sun to chemical energy stored in glucose through fermentation. anaerobic respiration. photosynthesis. aerobic respiration.

An analysis of 10.0 grams of sample of a compound is found to contain 27.0 percent sodium (na), 16.5 percent nitrogen (n), and 56.5 percent oxygen (o). determine the empirical formula of the compound.

All organic molecules contain carbon and hydrogen. what parts of an organic molecule may contain oxygen, nitrogen, or phosphorus?

Based on Reference Table J. which two reactants react spontaneously? (I) Mg (s) + ZnCl2 (aq) (2) Cu (s) + FeSO4 (aq) (3) Pb (s) + ZnCl2 (aq) (4) Co (s) + NaCl (aq)