Jenny and anne wanted to see who could throw the ball the hardest. they decided to each throw a ball against the wall as hard as they could and measured how far the ball rolled away from the wall. what might be the variables in this experiment;

Which is the most common nutrient deficiency in the world? a. iron b. zinc c. copper d. calcium

Which hemisphere of the earth releases the most carbon dioxide into the atmosphere? why

Calculate the molar mass of Al (OH) 3.

What happens in a reduction half-reaction? elements gain electrons elements lose electrons oxygen is added oxygen is lost

A liquid compound containing only hydrogen and oxygen is placed in a flask. Two electrodes are dipped into the liquid and an electric current is passed between them. Gaseous hydrogen forms at one electrode and gaseous oxygen at the other.

What is the molar mass of Al2 (SO4) 3?150.03 g/mol 278.03 g/mol 342.17 g/mol 450.09 g/mol

1. Which of the following species determines the chemical properties of an atom? A. Electron B. Neutron C. Nucleus D. Proton 2. The following glasswares are used to measure the volume of liquids except A. graduated beaker B. pipette C. test tube D.

A sample of a certain material has a mass of 2.03 x 10-3 g. calculate the volume of the sample, given the density is 9.133 x 10-1 g/cm3.

What happens to a reactant molecules when forming product molecules

Which is the atomic number of an atom with six valence electrons