Approximately how many elements are there that combine chemically in a great number of ways to produce compounds? A. 25 B. 50 C. 75 D. 100

Lewis structure XeH4? The hydrogen atom is not actually electronegative enough to form bonds to xenon. Were the xenon-hydrogen bond to exist, what would be the structure of XeH4?

What is the mass of silver that can be prepared from 2.10 g of copper metal? Cu (s) + 2AgNO3 (aq) →Cu (NO3) 2 (aq) + 2Ag (s)

Which particle is emitted when an atom of 85Kr spontaneously decays? (1) an alpha particle (3) a neutron (2) a beta particle (4) a proton

How many moles of Li3PO4 are in 2.2 L of a 0.6 M solution of Li3PO4? (remember Molarity=moles of solute/liters of solution)

A general term for a chemical which accelerates a reaction without becoming chemically involved is called a catalyst. true false

An atom of oxygen (atomic number 8) with an atomic mass of 16 would have how many neutrons?

Chlorophyll reflects which of these colors? a. red b. blue c. green d. yellow

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