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topjm [15]
3 years ago
9

Based on the results of this lab, write a short paragraph that summarizes how to distinguish physical changes from chemical chan

ges.
Chemistry
2 answers:
Naddika [18.5K]3 years ago
4 0
A physical change is reversible, a substance change isn't. A physical change is an adjustment in which no new substance is shaped; a synthetic change brings about the arrangement of at least one new substances
kozerog [31]3 years ago
4 0

Physical changes occur when the properties of a substance are retained and/or the materials can be recovered after the change. Chemical changes involve the formation of a new substance. Formation of a gas, solid, light, or heat are possible evidence of chemical change.

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A teaspoon of powdered caffeine can be as deadly as a teaspoon of ricin. <br><br> True or False
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4 0
3 years ago
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Which atomic models does Rutherford’s experimental evidence support? Explain why these models (Dalton, Bohr, Thomson models) are
ipn [44]

Answer:

Rutherford was the first scientist who proposed the nuclear model of the atom. According to his atomic model, most of the space of an atom is empty, while the nucleus containing protons and neutrons lie at the center of the atom while electrons revolve around nucleus in definite orbits.

If we talk about studies of some other scientists like Dalton, Neil Bohr and JJ Thomson, they all are compatible with Rutherford's results to a large extent.

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If we talk about Bohr's model, it states that electrons revolve around nucleus in specific shells, this again is compatible with Rutherford's results which gave the concept of shells.

If we talk about Thomson's Plum pudding model, that describe atom as negative particles floating within a soup of diffuse positive charge. This is also compatible with the results of Rutherford that state that negative electrons surround positive nucleus.

Rutherford's model was best atomic model but still it took help from many previous studies and therefore was compatible with the results of old models.


Hope it help!

5 0
3 years ago
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