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Science Flashcards

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1
Q

What is decomposition?

A

A chemical reaction that breaks down compounds into simpler products.

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2
Q

What is a replacement reaction?

A

A reaction in which one element replaces another in a compound; or when two elements in different compounds trade places.

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3
Q

What is an exothermic reaction?

A

A chemical reaction that releases energy in the form of heat.

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4
Q

What is an endothermic reaction?

A

Chemical reaction that absorbs energy in the form of heat.

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5
Q

What is activation energy?

A

The minimal amount of energy that has to be added to get a chemical reaction to start.

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6
Q

What is the law of conservation of mass?

A

The principal stating that matter is not created or destroyed during a chemical reaction.

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7
Q

What is a reactant?

A

A substance that enters into a chemical reaction.

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8
Q

SUBSCRIPT

A

The number in the chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound.

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9
Q

COEFFICIENT

A

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and products are involved in a reaction.

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10
Q

PRECIPITATE

A

A solid that forms from a solution during a chemical reaction.

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11
Q

MOLECULE

A

The combination of two or more atoms.

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12
Q

CHEMICAL FORMULA

A

A combination of symbols that represent the elements in a compound.

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13
Q

CHEMICAL EQUATION

A

A short easy way to show chemical reactions, using symbols instead of words.

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14
Q

MIXTURE

A

Two or more substances that are mixed together but not chemically combined.

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15
Q

SOLUTION

A

A well mixed mixture

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16
Q

ELEMENT

A

A substance that cannot be broken down into any other substances by chemical or physical means.

17
Q

COMPOUND

A

A substance made of two or more elements chemically combined in a specific ratio, or proportion.

18
Q

CHEMICAL REACTION

A

The process in which substances undergo chemical changes that result in the formation of new substances.

19
Q

What is solubility?

A

A measure of how well a solute can dissolve in a solvent

20
Q

What is a suspension?

A

A mixture in which particles can be seen and easily separated by settling or filtration.

21
Q

What is a concentrated solution?

A

A mixture that has a lot of solute dissolved in it.

22
Q

What ions would you expect to find when a base dissolves in water?

A

Hydroxide ions

23
Q

How may salt form?

A

Salt can be formed by the reaction between an acid and a base

24
Q

What is carbon steel mostly used for?

A

Tools, machinery, rails

25
Q

What is sterling silver mostly used for?

A

Jewelry, tableware

26
Q

Hydroxide ion (OH-)

A

Polyatomic ion made of oxygen and hydrogen

27
Q

PH scale

A

Series of numbers that indicate the concentration of hydrogen ions in a solution

28
Q

Acid rain

A

Problem caused by gases that are released into the air as pollutants

29
Q

Neutralization

A

Reaction between an acid and a base

30
Q

PH of digestive system?

A

Mouth 7

Stomach 2

Small intestine 8

31
Q

What are three useful properties of ceramics?

A

Moisture resistant, does not conduct electricity, can withstand extremely high temperatures.

32
Q

What metal is the main element in all types of steel?

A

Iron

33
Q

What is brass mainly used for?

A

Musical instruments, faucets, jewelry, decorative hardware

34
Q

What two processes of digestion begin in the mouth?

A

Mechanical and chemical digestion

35
Q

What is a flexible strong natural polymer that gives shape to plant cells?

A

Cellulose

36
Q

What is formed from two or more substances combined as a new material with different properties?

A

Composite

37
Q

A compound that changes color in the presence of an acid or base

A

Indicator

38
Q

What ions would you expect to find when an acid dissolves in water?

A

Hydrogen ions

Geography (2 decks)

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