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CHE 152 > Test 1 > Flashcards

Test 1 Flashcards

1
Q

The definitive distinction between ionic bonding and covalent bonding is that

A

Ionic bonding involves a transfer of electrons and covalent bonding involves a sharing of electrons

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2
Q

What is a hypothesis

A

a tentative interpretation or explanation of observations

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3
Q

What is a scientific law

A

brief statement that summarizes observations and predicts future observations

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4
Q

What is a theory

A

model for how nature is explained not only but why, but how it does it

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5
Q

What is physical change

A

when the state of matter changes

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6
Q

What is chemical change

A

when the composition alters so that a new substance forms

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7
Q

What is physical properties

A

property that a substance displays without chaning its composition

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8
Q

Example of physical properties?

A

smell, odor, taste, melting point, boiling point, density, apperance

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9
Q

What is chemical properties

A

property that a substance displays only by changing its composition through a chemical reaction

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10
Q

Example of chemical properties(change)

A

corrossivness acidity toxicity, combustion

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11
Q

What is energy

A

the capacity to do work

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12
Q

What is kinetic energy

A

energy associated with motion (thermal energy)

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13
Q

What is potential energy

A

energy associated with position or composition

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14
Q

What is the law of conservaton of energy

A

energy is neither created nor destroyed

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15
Q

What is extensive properties

A

depends upon the size

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16
Q

What are examples of extensive properties

A

volume, weight, mass

17
Q

What is intensive properties

A

doesn’t depend on size

18
Q

Example of intensive properties

A

atomic, melting point, color, density

19
Q

What is accuracy

A

how close measured value is to true value

20
Q

What is precision

A

how close a series of measurments are to one another

21
Q

What is the law of conservation of mass

A

mattter is neither created nor destroyed

22
Q

What is the law of definite proportions

A

all sample of a given compound have the same porpotions of their elements

23
Q

What is the law of multiple proportions

A

when two elements form two different compounds the masses of element B that combine with one gram of element A can be expressed as whole number ratios

24
Q

What is dalton’s atomic theory

A

each element is composed of tiny particles called atoms, all atoms of a given element have the same mass, atoms combine in simple whole number raitos to form compounds, atoms of one element cannot change into atoms of another element

25
Q

What is the molecular formula and an example

A

gives the actual number of atoms EX. H_2O_2

26
Q

What is the empirical formula and an example

A

gives the relative number of atoms Ex. HO (H_2O_2)

27
Q

What is the structural formula

A

shows how atoms are bonded

CHE 152 (2 decks)

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