There are three isotopes of silicon. They have mass numbers of 28, 29 and 30. The average atomic mass of silicon is 28.086amu. What does this say about the relative abundances of the three isotopes?

Identify the alkane that contains four carbons.

The Bohr atomic model suggests that: The atom is made mostly of space. Electrons randomly orbit the nucleus. Protons and neutrons occupy energy shells. Gamma rays can can be used to split atoms.

Consider the amount of heat energy delivered to an object by the same mass of liquid water at 100°C and steam at 100°C. Which statement is true? a. Liquid water delivers more energy because it has more mass. b.

If 22.50 mL of a sodium hydroxide solution is necessary to neutralize 18.50 mL of a 0.1430 M HNO3 solution, what is the concentration of the NaOH? (Report your answer in molarity.)

Nitrogen (N) has seven electrons. How many electrons are in the second shell of a nitrogen atom?

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In which choice is the ellipsis used correctly to select from this sentence from The Scarlet Letter? A throng of bearded men, in sad-coloured garments and grey steeple-crowned hats, inter-mixed with women, some wearing hoods, and others bareheaded,

Explain the difference between the greenhouse effect and global warming.

How does adding salt affect the surface tension of water? if it increases surface tension, will it always increase it?

Which usually has a higher temperature? A city or the areas around the city?