Which of the following is true about petroleum?

O It emits harmful radiation.

O It is the most expensive fuel.

O It produces greenhouse gases.

O It provides a clean source of energy.

What information guided Mendeleev as he placed elements in his periodic table

What is this material This material can begin as a solid on the surface of the Earth. Weathering can then break the material up into pieces, and erosion can transport the pieces to ocean bottoms.

Which of the following is the correct name for the compound hgs? mercury sulfide mercury (i) sulfide mercury (ii) sulfide mercury monosulfide?

Solid solution of a metal or nonmetal dissolved in a metal

The "bleaching" of plant leaves is caused by: A. water pollution B. poor soil quality C. air pollution D. excess bacteria

Compared to a potassium atom, a potassium ion has A) a smaller radius B) a larger radius C) fewer protons D) more protons

Which unit measures mass?

The mechanism for the reaction described by 2N2O5 (g) - - - > 4NO2 (g) + O2 (g) is suggested to be (1) N2O5 (g) (k1) - - - > (K-1) NO2 (g) + NO3 (g) (2) NO2 (g) + NO3 (g) - - - > (K2) NO2 (g) + O2 (g) + NO (g) (3) NO (g) + N2O5 (g) - - - > (K3) 3NO2

Which question can be answered using the scientific method? A) Which dog food is best for healthy teeth? B) What color is the most attractive? C) What is my purpose in life? D) Which flower smells the best?

For the galvanic cell reaction, expressed below using shorthand notation, what half-reaction occurs at the cathode?