How can carbon 14 and carbon 12 be the same element when both have the same number of protons (6 protons) but different number of neutrons? explain your answer

List two fossil fuels. Describe in general how fossil fuels were formed.

What is the force that accelerates objects towards Earth?

The peak is intensity for our sun on a black body curve would be in which of the following wavelength ranges? 0.01-10nm 10-380nm 560-600nm 1,000,000-100,000,000nm

Explain which of the following are correct statements of the Second Law of Thermodynamics and which are not. a. All reversible heat engines have the same efficiency. b. An engine connected to one heat reservoir can do work on the surroundings. c.

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN3 (s) → 2Na (s) + 3N2 (g) How many moles of N2 are produced by the decomposition of 1.25 mol of sodium azide? a) 4.32 b) 8.64 c) 1 ... e2 d) 1.

Convert: 65 kg to mg 65,000 mg O 65,000,000 mg O 65 mg

F. How many representative particles are in 6.78 moles of sucrose C12H22011?

The ratio of the lengths of two sides of a right triangle forms a

What element is used in making thermometers

How many dots are shown in the electron dot diagram for calcium, in group II and period 4 with 20 protons and 20 electrons? a. four c. eight b. two d. twenty