Chemistry Unit d Flashcards

1
Q

A solid combination of atoms of two or more metals

A

Alloy

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2
Q

A layer that is physically attached to a product of two or more metals

A

Alloy

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3
Q

A layer that is physically attracted to a product to protect, add color, or enhance its performance

A

Coating

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4
Q

An alloy of zinc and copper

A

Brass

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5
Q

Plastics are made from this substance

A

Petroleum

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6
Q

The hardness of pencil lead is controlled by the amount of what mixed put in it

A

Clay

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7
Q

An allotrope of carbon composed of flat sheets of carbon atoms that can slip by one another easily

A

Graphite

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8
Q

Elements that make up most semiconductors

A

Metlloids

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9
Q

In electroplating, the power source provides these needed particles

A

Electrons

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10
Q

A material that can conduct an electric current without any electoral resistance

A

Super conductor

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11
Q

The process of adding impurities to an element to improve its properties

A

Doping

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12
Q

The deposit of thin layer of metal on the surface of an object by a process involving oxidation-reduction reactions

A

Electroplating

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13
Q

Different types of an element that each have distinctly different chemical or physical properties

A

All trope

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14
Q

In electroplating the electrode at which reduction occurs

A

Cathode

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15
Q

This engineered substance, a metal replacement for many uses, that is composed of carbon-atom chains or rings with hydrogen and other atoms attached

A

Plastic

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16
Q

What no metal is composed of both steel and stainless steel

A

Carbon

17
Q

In the lab “sticking rich” the penny that was heated in the zinc chloride and then on the hot plate turned to

A

Brass

18
Q

In the lab” copper plating” ____ was anode

A

Copper

19
Q

In the lab “copper plating” what was the reaction that occurred at the cathode

A

Reduction

20
Q

What does decant mean

A

To pour carefully

21
Q

Why as zinc added to cucl2 solution instead of Ag metal

A

Zinc is more reactive

22
Q

An allotrope of carbon which is the hardest substance known

A

Diamond