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Lecture 11

PHY 2020 Lecture 11: Chapter 11-12

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Florida Gulf Coast University
PHY 2020

Chapter 11 1. Which contributes more to an atom’s mass electrons or protons? Which contributes more to an atom’s size? Protons contribute to an atom’s mass Electrons contribute to an atom’s size 2. A hydrogen atom and a carbon atom move at the same speed. Which has the greater kinetic energy? Hydrogen= 1 Carbon= 12 3. Why do electrically neutral atoms repel one another when they are close? The atoms that constitute your body are mostly empty space, and structures such as the chair you’re sitting on are composed of atoms that are mostly empty space. 4. So why don’t you fall through the chair? Electrons in one atom repel the electrons in another. 5. Avogrado’s number Na= 6.0221415X10^23 mol-1 A mole will possess mass approximately equal to the substances molecular weight. 6. A tree is composed mainly from carbon. Where does this carbon come from? The air. Photosynthesis. 7. 1 column of the periodic table is alkaline and noble gases. 8. Isotopes: atoms of the same element that have different numbers of neutrons 9. Size of an atom does not change with mass. 10.An atom of antimatter has a negatively charged nucleus surrounded by protons 11.Atoms are smaller than All of these 12.The size of atoms has most to do with its: Electrons 13.How many different elements are in a water molecule? 2 14.How many atoms are in a water molecule? 3 15.An atomic mass unit (amu) is 1/12 the mass of: Carbon atom 16.There are only about 100 different kinds of atoms that combine to form all substances 17.What makes an element distinct? The number of protons. 18.In our part of the universe, antimatter is: Short lived. 19.Solid matter is mostly empty space largely because: Atom’s themselves are mostly empty space 20.What is the molecular mass of water? 18 amu 21.In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of: Orbital electrons 2
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