Law of conservation of Mass / Chemical Reactions

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17 Terms

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law of conservation of mass

a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system

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mass

the amount of matter in an object

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matter

that which has mass and occupies space

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compound

A substance made up of atoms of two or more different elements joined by chemical bonds

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molecule

composed of two or more elements (they could be the same or different) joined by chemical bonds.

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element

any of the more than 118 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

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atom

(physics and chemistry) the smallest component of an element having the chemical properties of the element

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reactant

a chemical substance that is present at the start of a chemical reaction / on the left side of the yield sign

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product

a chemical substance formed as a result of a chemical reaction / on the right side of the yield sign

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subscript

In a chemical formula, this is a number that tells how many atoms in a molecule or the ratio of elements in a compound. When balancing chemical equations, these numbers cannot be changed.

<p>In a chemical formula, this is a number that tells how many atoms in a molecule or the ratio of elements in a compound. When balancing chemical equations, these numbers cannot be changed.</p>
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coefficent

A number placed in front of a chemical symbol to balance a chemical equation. When balancing chemical equations, you can add or change these.

<p>A number placed in front of a chemical symbol to balance a chemical equation. When balancing chemical equations, you can add or change these.</p>
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balanced equation

chemical equation with the same number of atoms of each element on both sides of the equation

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mixture

(chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding)

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physical properties

Properties of matter that can be observed such as color, magnetism, shape, texture, conductivity, weight, mass, solubility, density

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chemical properties

characteristics that can only be observed when one substance changes into a different substance (reactivity, flammability).

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chemical change

a change in which one or more substances combine or break apart to form new substances

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physical change

a change from one state (solid or liquid or gas) to another without a change in chemical composition