Chapter 3 - Chem
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is the smallest unit of matter? | the atom
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| What is a substance that cannot be broken down by ordinary chemical means? | element
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| Who coined the term the atom? | Democritus
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| What law says, "Mass is neither created nor destroyed during ordinary chemical reactions or physical changes"? | Law of Conservation of Mass
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| The transformation of a substance or substances into one or more new substances is known as | chemical reaction
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| A chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound according to what law? | Law of Definite Proportions
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| It two or more different compounds are composed of the same two elements then the ratio of the masses of the second element combined with a certain mass of the first element is always a ration of small whole numbers is stated by what law? | Law of Multiple Proportions
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| Who developed the atomic theory | Dalton
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| Are atoms divisible into smaller particles? | yes
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| All matter is composed of what? | atoms
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| What identifies an element | the proton
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| What are the two main parts of an atom? | nucleus and the electron cloud
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| What are the subatomic properties of an atom? | proton, neutron, electron
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| What charge does a proton have? | positive
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| What charge does a neutron have? | neutral
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| What charge does an electron have? | negative
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| What subatomic particle(s) are found in the nucleus? | proton and neutron
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| What subatomic particle(s) are found in the electron cloud? | electrons
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| What scientist measured the charge-to-mass ration of an electron? | J.J. Thomson
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| Who did the oil drop experiment? | Robert Milikan
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