Is the following sentence true or false? Mendeleev used his periodic table to predict the properties of undiscovered elements.

Hydrogen and oxygen bond to form water. What is the chemical formula for each of these reactants? A. H and HO B. O and HO C. H and O D, HO and O

1.) Describe specialized feeding structures of parasitic platyhelminths. 2.) Some parasitic flatworms have a very complicated life cycle with more than one host. Infer why this might be adaptive. 3.

Is TI a element compound or molecule

PF3Br2 is a nonpolar molecule. Based on this information, determine the F-P-F bond angle, the Br-P-Br bond angle, and the F-P-Br bond angle. Enter the number of degrees of the F-P-F, Br-P-Br, and F-P-Br bond angles, separated by commas (e. g.

Which statement explains how commercial land use negatively impacts watersheds? O Chemicals in fertilizers run off into water and cause algae blooms. O Production of clothing items makes pollutants that contaminate the water.

Which atom has a nucleus that contains 13 protons and 14 neutrons 1. Mg 2. Be 3. Al 4. N

Determine the oxidation state of the metal ion in [co (nh3) 5br]2+. express your answer as an integer.

Which functional group contains oxygen atom? a. Carbonyl group b. Amino group c. Sulfhydryl group

A mountain is a example of solid?

Explain, in terms of electrons, why the radius of a calcium ion is smaller than the radius of a calcium atom.