Comprehension Questions Flashcards

1
Q

Who proposed the idea that matter is composed of small indivisual particles called atoms

A

Democritis and Leucippus

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2
Q

What ideas did Aristotle propose

A

He believed that matter was composed of four elements fire earth air and water

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3
Q

In 18u Ed John Dalton published his atomic theory, what did he state?

A

Dalton stated that all elements are made up of small indivisible particles called atoms

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4
Q

In the scientist that discovered the electron

A

J.j Thompson

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5
Q

What experiment was JJ Thompson carrying out when he discovered the electron

A

He was investigating the way gases conduct electricity

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6
Q

In Thompsonโ€™s experiment how did he show the electrons had a negative charge

A

The electron beam was attracted towards the positive plate therefore they must be chemically charged

The particles were approximately 2000 x lighter than a hydrogen atom and he called them atoms

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7
Q

What did Thompsonโ€™s model of the atom look like

A

A plum pudding

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8
Q

How was Thompsonโ€™s model of an atom similar to a Christmas pudding

A

Atoms have negative electrons embedded in the sphere of positive charge just like currents embedded in pudding

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9
Q

Why did Thompson suggest that the atom was neutral

A

Is contained equal numbers of positive and negative charges and they cancelled each other out

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10
Q

What did Rutherford discover about the atom

A

The nucleus

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11
Q

Where is nearly all of an atoms mass contained

A

In the nucleus

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12
Q

In what way was rutherfordโ€™s model of the atom similar to planets revolving around the sun

A

Positive nucleus similar to sun at center and electrons orbiting around like planets

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13
Q

What part of the atom did James Chadwick discover in 1932

A

Neutrons

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14
Q

How does the mass of a neutron compare with the mass of a proton

A

The mass of the proton (1) is equal to the mass of the neutron (1)

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