Help! The products of a chemical equation are CO2 and 2H20. Which set of atoms must make up the equation's reactants so that the equation models the law
of conservation of mass?
A. 2 C,3 O, and 4 Hg
B. 2 C,2 O, and 3 H
C. 1 Ca, 4 O, and 4 H
D. 1 C, 4 O and 4 H

The grooves or folds of the brain are called

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Each of the following reactions is allowed to come to equilibrium and then the volume is changed as indicated. predict the effect (shift right, shift left, or no effect) of the indicated volume change. drag the appropriate items to their respective bins. co(g) + h2o(g) < => co2(g) + h2(g) (volume is decreased) pcl3(g) + cl2(g) < => pcl5(g) (volume is increased) caco3(s)< => cao(s) + co2(g) (volume is increased)