Limestone originates because of:

A. chemical precipitation

B. chemical weathering

C. physical weathering

D. biological processes

If the temperature of an object is 335K, how would his be expressed on the celsius scale?

For an experiment, we need 4.5 L of a 1 M solution of Nacl. How many moles of NaCl do we need?

What is one way to describe elements? A. building blocks B. they break down easily C. smallest particles of material D. they are the most expensive materials on earth

How does the burning of fossil fuels increase the greenhouse effect?

During radioactive decay, atomic nuclei of unstable isotopes do what?

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