Introduction to Chemistry

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What is the smallest unit of an element?
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An atom is the smallest unit of an element.
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What is the chemical symbol for water?
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The chemical symbol for water is H2O.
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How many elements are in the periodic table?
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There are 118 confirmed elements in the periodic table.
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What is a substance made of two or more elements called?
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A compound is a substance made of two or more elements.
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What is the center of an atom called?
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The nucleus is the center of an atom.
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What is the positively charged particle in the nucleus of an atom?
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The proton is the positively charged particle in the nucleus.
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What is a chemical reaction?
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A chemical reaction is a process where substances change into new substances.
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What is a solution?
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A solution is a homogeneous mixture of two or more substances.
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What do you call a reaction that gives off heat?
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An exothermic reaction gives off heat.
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What is the negatively charged particle in an atom?
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The electron is the negatively charged particle in an atom.
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Name the three states of matter.
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The three states of matter are solid, liquid, and gas.
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What is pH a measure of?
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pH is a measure of how acidic or basic a solution is.
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What is an element?
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An element is a pure substance made of only one type of atom.
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What is a neutral particle in the nucleus of an atom?
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A neutron is a neutral particle in the nucleus.
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What is the term for a change of state from gas to liquid?
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Condensation is the change from gas to liquid.
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