How are the atomic numbers and the atomic masses of the elements related to how the elements are arranged on the periodic table?

Calculate the PH if the Poh is 8.00

10% of the earths water is freshwater. True or false?

Calculate the moles of carbon dioxide that are released when 44.7 g of calcium carbonate (molar mass = 100.0 g/mol) is heated (assuming that the reaction goes to completion). give your answer to three significant figures.

Which is a characteristic of aromatic hydrocarbons? A. They have triple bonds B. They are cyclic C. They are saturated D. They are in straight lines.

What is the product of a substitution reaction if the reactants are fluoroethane and sodium hydroxide?

Which term best describes the type of bonding in magnesium chloride

This equation indicates that the reaction gives off heat. What is this type of reaction called? 2C4H10 + ? O2? 8CO2 + 10H2O + heat a. an exothermic reaction b. an endothermic reaction c. absorption reaction d. precipitation reaction

Given the balanced equation representing a reaction: C3H8 (g) + 5O2 (g) = = >3CO2 (g) + 4H2O (g) What is the total number of moles of O2 (g) required for the complete combustion of 1.5 moles of C3H8 (g) ? (1) 0.30 mol (3) 4.5 mol (2) 1.5 mol (4) 7.

What increases in equal steps of one from left to right in the Periodic Table for the elements lithium to neon?

The organisms living together in a community are interdependent upon one another. Look at the food web below. In which of the following ways is a puffin dependent upon salmon? A. Puffins have a commensalistic relationship with salmon. B.