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Science 8th > Unit 4 Chemical Equations > Flashcards

Unit 4 Chemical Equations Flashcards

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1
Q

A number written below and to the right of a chemical symbol, shows the number of a specific type of atom present

A

Subscript

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2
Q

A shorthand notation that uses chemical symbols and numbers as subscripts to represent the type of atoms and number of atoms that are present in the smallest unit of the substance</p>

A

Chemical Formula

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3
Q

<p class=”large” style=”text-align:center”;>The process by which one or more substances change to produce one or more different substances</p>

A

<p class=”large” style=”text-align:center”;>Chemical Reaction</p>

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4
Q

Chemical formulas and symbols written to represent a reaction

A

Chemical Equation

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5
Q

A number placed in front of a chemical symbol or formula during balancing of the equation

A

Coefficient

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6
Q

A substance that takes part in and undergoes change during a reaction

A

Reactants

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7
Q

A substance produced during a chemical reaction

A

Products

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8
Q

<p class=”large” style=”text-align:center”;>The mass of all reactants must equal the mass of all products, mass is neither created nor destroyed</p>

A

<p class=”large” style=”text-align:center”;>Law of Conservation of Mass</p>

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9
Q

The amount of matter an object contains, measured in grams

A

Mass

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10
Q

A symbolic representation of a chemical reaction in which both sides of the equation contain equivalent numbers of atoms of each element. The mass and the charge must be balanced on both sides of the reaction.

A

Balanced Chemical Equation

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12
Q

The characteristics of a substance: physical and chemical

A

Property

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13
Q

Elements or compounds that can only be separated or combined to make substances with new properties by means of a chemical reaction

A

Substance

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14
Q

The characteristics of a substance: physical and chemical

A

<p>Property</p>

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15
Q

A solid substance that forms in a liquid from a chemical reaction

A

Precipitate

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16
Q

A reaction that gets cold because heat energy is absorbed from the surroundings

A

Endothermic

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17
Q

A reaction that gets hot because heat energy is released

A

Exothermic

18
Q

Chemical formulas and symbols written to represent a reaction

A

Chemical Equation

19
Q

A substance that takes part in and undergoes change during a reaction

A

Reactants

20
Q

A solid substance that forms in a liquid from a chemical reaction

A

<p>Precipitate</p>

21
Q

Two elements react to form a compound

A

Synthesis

22
Q

A compound breaks down into two substances (an element and a compound)

A

Decomposition

23
Q

<p class=”large” style=”text-align:center”;>The process by which one or more substances change to produce one or more different substances</p>

A

<p class=”large” style=”text-align:center”;>Chemical Reaction</p>

24
Q

Two elements from different compounds switch places and form new substances

A

Double Replacement

25
Q

When an organic substance combines with oxygen and releases large amounts of heat and light energy

A

Combustion

26
Q

<p class=”large” style=”text-align:center”;>A single element replaces another in a compound and forms new substances</p>

A

<p class=”large” style=”text-align:center”;>Single Replacement</p>

27
Q

2MgO How many atoms of magnesium in this chemical formula?

A

2 atoms

28
Q

A Coefficient tells you how many ? of a formula.

A

Molecules

29
Q

A subscript shows you how many of what element?

A

atoms

30
Q

The arrow is know as the

A

yields

31
Q

Chemical Equations must be balanced because of what Law

A

The Law of Conservation of Mass

32
Q

The new substance formed in a chemical equations is on what side?

A

right side

33
Q

Bubbles forming in a chemical reactions are a sign of what?

A

Gases

Science 8th (5 decks)

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