Atoms have the same number of neutrons but a different number of protons are called isotopes.

T or F

How many grams of N are in 89.0 g of NH4NO3

Which can occur in the rock cycle? a. Sedimentary rock is heated and a squeezed to from metamorphic rock. b. igneous rock is eroded to from metamorphic rock. c. metamorphic rock melts to from sedimentary rock. d. none ofthe above.

The Scott Test is used when which drug is suspected?

Which atom has the weakest attraction for electrons in a chemical bond?

Which of the following is true about all electromagnetic waves in a vacuum? a. they all carry the same energy. b. they all travel at the same speed. c. they all have the same frequency. d. the all have the same wavelength.

Calculate the volume of a 0.323-mol sample of a gas at 265 K and 0.900 atm.

What is the molar mass of the following substance : Cs2CO3

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.