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Physical Science > C19 Terms > Flashcards

C19 Terms Flashcards

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1
Q

chemical formula

A

A shorthanded way to tell the identity of a compound

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2
Q

empirical formula

A

Shows only the relative proportion of the elements

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3
Q

oxidation number (ON)

A

The number of electrons that a bonded atom or ion would have to gain or lose to return to its natural state

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4
Q

polyatomic ion

A

Can bond with other atomic or polyatomic ions to form ionic compounds

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5
Q

binary compound

A

Compounds of only two elements

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6
Q

Stock system

A

A Roman numeral comes after the mane of the metal

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7
Q

chemical reaction

A

Atoms are rearranged

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8
Q

chemical equation

A

Describes what happens during a chemical change

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9
Q

reactant

A

The formulas on the left side of the arrow

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10
Q

product

A

The formula on the right of the arrow

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11
Q

coefficient

A

Placed in front of a term in an equation

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12
Q

precipitate

A

When a solid product from a reaction settles out of solution

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13
Q

composition reaction

A

Reactions that combine

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14
Q

decomposition reaction

A

Reactions that break apart

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15
Q

single-replacement reactions

A

One element in a compound is replaced by anther

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16
Q

double-replacement reaction

A

Two compounds Swap cations

17
Q

exothermic reaction

A

Reactions that release thermal energy

18
Q

endothermic reaction

A

Reactions that absorb thermal energy

19
Q

What information does a chemical formula provide?

A

The amount of atoms in a compound

20
Q

Why do some elements have multiple oxidation numbers?

A

The oxidation numbers can vary

21
Q

Which element is usually written first in a chemical formula?

A

The one which occurs first in the alphabet.

22
Q

How can you determine the sign and value of the charge on a polyatomic ion?

A

Idk

23
Q

How do you indicate the presence of more than one occurrence of a polyatomic ion in a compounds formula unit?

A

Idk

24
Q

Name five signs that a chemical change may have taken place

A

A solid separates from a liquid mixture of chemicals. A gas is produced by means other than evaporation. A substances color changes permanently. The temperature changes. Light sound or anther type of energy is produced.

25
Q

What is a balanced chemical equation? Why is it important for an equation to be balanced?

A

An equation that both sides are equal. It will not work other wise

26
Q

Why do chemists sometimes include special symbols in chemical equations?

A

To make it more complex

27
Q

What must usually be added to make a compound decompose?

A

Energy

Physical Science (20 decks)

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