Unit 11: Chemical Reactions - Key Terms and Definitions for Engineering Studies

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18 Terms

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Endothermic

A chemical reaction that absorbs heat. Feels cold to the touch.

<p>A chemical reaction that absorbs heat. Feels cold to the touch.</p>
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Exothermic

A chemical reaction in which energy is released. Feels warm to the touch.

<p>A chemical reaction in which energy is released. Feels warm to the touch.</p>
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Subscript

The smaller number in a chemical formula representing the number of atoms of a particular element in that element or compound.

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Chemical Formula

A symbolic representation of a compound. Examples: NaCl (table salt), and H2O (water)

<p>A symbolic representation of a compound. Examples: NaCl (table salt), and H2O (water)</p>
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Chemical Reaction

A process that involves breaking of bonds in the reactants and forming new bonds in the products. (like baking or burning)

<p>A process that involves breaking of bonds in the reactants and forming new bonds in the products. (like baking or burning)</p>
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Chemical Bond

Holds two or more atoms together in a molecule.

<p>Holds two or more atoms together in a molecule.</p>
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Chemical Equation

A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products.

<p>A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products.</p>
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Reactants

The substances or molecules that participates in a chemical reaction. Found on the left side of a chemical equation.

<p>The substances or molecules that participates in a chemical reaction. Found on the left side of a chemical equation.</p>
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Products

The newly formed substance(s) as a result of a chemical reaction. Found on the right side of a chemical equation.

<p>The newly formed substance(s) as a result of a chemical reaction. Found on the right side of a chemical equation.</p>
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Coefficient

The larger number placed in front of a formula in an equation to indicate the amount of that substance.

<p>The larger number placed in front of a formula in an equation to indicate the amount of that substance.</p>
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Catalyst

This is something that helps a reaction get started and speeds it up. It is NOT one of the reactants.

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Balanced Equation

This occurs when both sides have the same number of atoms.

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Synthesis

Two or more substances combine to form another substance.

<p>Two or more substances combine to form another substance.</p>
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Decomposition

One substance breaks down into two or more substances.

<p>One substance breaks down into two or more substances.</p>
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Single Displacement

One element replaces another element in a compound (single element reacting with a compound)

<p>One element replaces another element in a compound (single element reacting with a compound)</p>
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Chemical Change

6 signs of this are as following: change in temperature, change in odor, change in color, formation of gas (bubbles, formation of light, and formation of a precipitate (a solid formed by mixing two liquids)

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Double Displacement

One element replaces another element in two compounds (two compounds reacting with each other)

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Diatomic Element

An element that has 2 atoms bonded together. hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine

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