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Chemistry > Chapter 1 - The Science Of Matter > Flashcards

Chapter 1 - The Science Of Matter Flashcards

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1
Q

What is chemistry?

A

The science that investigates & explains the structure & properties of matter.

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2
Q

What is the macroscopic level?

A

It is based on behavior & composition of matter (visible)

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3
Q

What is the submicroscopic level?

A

It is the hidden structure that influences its behavior (non visible)

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4
Q

What is a qualitative observation?

A

An observation made without measurement.

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5
Q

What is a quantitative measurement?

A

An observation made with measurement.

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6
Q

What is a substance?

A

Matter with the same fixed composition & properties.

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7
Q

What is a pure substance?

A

Every bit of matter is the same substance.

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8
Q

What is a mixture?

A

A combination of 2 or more substances that can be separated by physical processes.

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9
Q

What are some examples of a physical change?

A

Boiling, melting, dissolving, crystallizing, etc.

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10
Q

What is a heterogenous mixture?

A

A mixture where individual substances can be identified.

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11
Q

What is a homogenous mixture or solution?

A

A mixture that has uniform & is the same throughout.

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12
Q

What is an alloy?

A

A solid solution that contains different metals & sometimes nonmetallic substances.

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13
Q

What is a solute?

A

Th substance being dissolved.

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14
Q

What is a solvent?

A

Substance that dissolves the solute.

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15
Q

What is an aqueous solution?

A

A solution where the solvent is water.

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16
Q

What are the two types of pure substances?

A

Compounds & elements.

17
Q

What is the simplest form of matter?

A

An element.

18
Q

How many elements are there & how many occur naturally on earth?

A

118 total elements & 90.

19
Q

What is a compound?

A

Chemical combination of 2 or more different elements joined together.

20
Q

What is a chemical formula?

A

Combination of chemical symbols that shows the elements that make up a compound & how many atoms there are of each.

21
Q

What is volatile?

A

When something is able to change to gas at room temperature.

22
Q

What is density?

A

Amount of mass contained in a unit of volume; D=m/v.

23
Q

What is a chemical change or reaction?

A

Change of one or more substances into another substance.

24
Q

What is the law of conservation of mass?

A

Matter is neither created nor destroyed in a chemical change.

25
Q

What is energy?

A

The ability to do work.

26
Q

What is exothermic?

A

Chemical reaction that releases heat energy.

27
Q

What is endothermic?

A

Chemical reaction that absorbs heat energy.

Chemistry (2 decks)

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