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Related Flashcards
Cards In This Set
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What is anything that occupies space and has mass?
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 Matter |
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What is a substance that cannot be broken down into other substances by ordinary chemical means?
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 Element |
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How many elements occur in nature?
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92
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What are trace elements?
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 Trace elements are elements that are vital for our health, yet we only need small amounts of them. These include Magnesium, Chlorine, and Sodium |
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Why are elements added to our food?
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 Elements are put in our food to make it taste better, last longer, or even just look better. |
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Which four chemical elements are most abundant in living matter?
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Oxygen, Hydrogen, Nitrogen, and Carbon
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What is a compound?
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A substance containing two or more elements in a fixed ratio.
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Why are sodium chloride and vitamin A both classified as compounds?
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Because they are both made up of more than one element.
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What is the smallest unit of matter that still retains the properties of an element?
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Atom.
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1. A subatomic particle with a positive charge2. A subatomic particle with a negative charge3. A subatomic particle with no charge (neutral).
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1. Proton2. Electron3. Neutron
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What subatomic particles are in the nucleus of an atom?
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Protons and neutrons
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What keeps the electrons orbiting the nucleus close to it?
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The attraction to the protons
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What is the number that defines the element?
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The atomic number/the number of protons.
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What is an elements mass number?
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The sum of the protons and neutrons in an atoms nucleus. This is close to the atomic mass of the element, because electrons are 2000 times less in mass than protons and neutrons.
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What are isotopes?
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Isotopes are elements that have the same amount of protons and electrons as most, but vary in the number of neutrons. They also keep the same identity throughout the change.
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