What new characteristic did John Dalton add to the model of the atom? (A) An atom is a round, solid mass. (b) An atom has a massive, positive center. (C) An atom is made up of smaller particles. (D) An atom can join with other kinds of atoms.

What is the electron domain geometry about phosphorus in the hexafluorophosphate anion (pf6-) g?

How does a trigonal pyramid differ from a tetrahedron so far as molecular geometry is concerned? Bond angles in the tetrahedral molecule are 120°, while those for trigonal pyramid are 109.5° A trigonal pyramid is a tetrahedron with two vacant vertex.

Limestone originates because of: A. chemical precipitation B. chemical weathering C. physical weathering D. biological processes

Enter the net ionic equation to show the reaction of aqueous lead (II) nitrate with aqueous potassium sulfate to form solid lead (II) sulfate and aqueous potassium nitrate.

Your boss asks you to design a room that can be as soundproof as possible and provides you with three samples of material. The only information on each sample's label is the material's coefficient of absorption.

Extracting oil from shale deposits a has been initiated on a large scale in the United States and will soon surpass Canada's production. b involves removing and refining waxy hydrocarbons called kerogen.

Which shows the levels of organization within an ecosystem from largest to smallest?

the physical properties of 10 grams of iron are the same as the ___ properties of 20 grams of iron a) reactive b) physical c) chemical

How many moles in 68.1 grams of Cu (OH) 2

What happens to the particles in a substance when it is cold?