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General Chemistry > module 3 > Flashcards

module 3 Flashcards

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1
Q

who coined the word atomos?

A

Democritus

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2
Q

the scientist who provided precise and detailed description of the building blocks of matter

A

John Dalton

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3
Q

elements that combine in ratios of simple whole numbers to form a compound

A

law of definite proportions or constant composition

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4
Q

when two elements react to form two or more different compounds

A

law of multiple proportions

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5
Q

states that matter is neither created nor destroyed

A

law of conservation of mass

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6
Q

negatively charged subatomic particle

A

electron

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7
Q

who discovered electrons?

A

J.J. Thomson

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8
Q

who was behind the cathode ray tube experiment?

A

J.J. Thomson

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9
Q

positively charged subatomic particle

A

proton

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10
Q

who discovered protons?

A

Ernest Rutherford

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11
Q

located at the center of atom

A

nucleus

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12
Q

who was behind the famous gold foil experiment?

A

Ernest Rutherford

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13
Q

neutral subatomic particle

A

neutron

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14
Q

who discovered neutrons?

A

James Chadwick

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15
Q

who was behind the beryllium foil experiment?

A

James Chadwick

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16
Q

equal to the number of protons in an atom

A

atomic number

17
Q

total amount of particles

A

mass number

18
Q

same number of protons, but different number of neutrons

A

isotopes

19
Q

isotopes that do not undergo radioactivity

A

stable isotopes

20
Q

isotopes that exhibit radioactivity

A

unstable isotopes

21
Q

an atom may either lose or gain an electron to give an electrically charged species called

A

ions

22
Q

when an atom gains an electron, it becomes negatively charge and is then called an

A

anion

23
Q

when an atom gives off an electron, its charge become positive and is then called a

A

cation

24
Q

collection of two or more atoms held in specific arrangement due to sharing of electrons and acts a single unit is called a

A

molecule

25
Q

molecules can just be a combination of the same element, which are called

A

diatomic molecules

26
Q

a compound that denotes the exact number of atoms present in a molecule

A

molecular formula

27
Q

it does not provide the exact number of atoms present in a molecule

A

empirical formula

General Chemistry (3 decks)

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