Chemistry quiz

When J.J. Thomson experimented with the Cathode Ray Tube, he used magnetic fields and electric fields to observe how the "ray" behaved.  He concluded that the "ray" had to be composed of negatively charged particles because____.

• It was repelled by positive charge

• It was not affected by a charged field/plate

• It was repelled by negative charge

• It was attracted by a negative charge

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NGSS.HS-PS2-4

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Thomson determined the mass of the cathode ray particles by measuring the amount of deflection (how far it moved) of the ray in magnetic fields. This experiment led to a fascinating discovery: the mass of each particle was much smaller than that of any known atom.  What did Thomson conclude from this result?

• There are different kinds of atoms

• All atoms are made out of Hydrogen atoms

• Atoms must be made of even smaller/lighter particle

• All atoms contain Hydrogen atoms inside

When Rutherford conducted the Gold Foil experiment he saw overwhelmingly that MOST of the positively charged alpha particles pass straight through the Gold atoms in the foil.  What did Rutherford conclude based on this observation?

• Most of the atom is made of protons

• Most of the atom is made of empty space

• Most of the atom is made of electrons

• Most of the atom is made of a dense core

When Rutherford conducted the Gold Foil experiment he saw SOME of the positively charged alpha particles deflecting to the side. What did this observation lead him to conclude about the Gold atoms in the Gold foil?

• The Gold atoms contain a positively charged core called the nucleus.

• The Gold atoms contain a neutral core called the neutron.

• The Gold atoms contain a neutral core called the nucleus.

• The Gold atoms contain a negatively charged core called the nucleus.

When Thompson conducted the Cathode Ray experiment he saw that the cathode ray was able to force the small paddle wheel to turn inside the tube.  What did this observation lead him to conclude about the cathode ray itself?

• The cathode ray was made up of particles that had mass.

• The cathode ray had particles that were part of the atom but had absolutely no mass.

• The cathode ray had to have a positive charge.

• The cathode ray couldn't have a charge.

What is an alpha decay?

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What is a beta decay?

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What is a gamma decay?

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How many protons are in Iodine?

• 126

• 53

• 54

• 140

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NGSS.HS-PS1-1

How many neutrons are in Iodine?

(Hint) mass number -number of protons=neutrons

• 126

• 53

• 74

• 81

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