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Ch.2 - Atoms, Molecules, and Ions

Chapter 2, Problem 16b

An unknown particle is caused to move between two electrically charged plates, as illustrated in Figure 2.7. You hypothesize that the particle is a proton. (b) Would it be deflected by a smaller or larger amount than the b rays?

Diagram showing an unknown particle moving between positively and negatively charged plates.

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Hi everyone. This problem reads A particle is projected between two electrically charged plates. As shown below. A beta ray is also shown in comparison is the particle an electron. So this is the question that we want to answer. And so looking at our image, we see the electrically charged plates. Here is the positive charge and here is the negative charge. Okay. And we have a ray that is also shown. So here is this image. Alright. So from this image we can see that the unknown particle is deflected towards the negatively charged plate, which tells us that the particle is positively charged, right? Because it's going towards the negative charge. And we know opposites attract. And so that tells us that it is a positively charged particle and therefore if it's positively charged it cannot be an electron because an electron is a negatively charged particle. Okay, so that makes the answer for this question be No. The particle is not an electron. That's it for this problem. I hope this was helpful.
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Textbook Question

In a series of experiments, a chemist prepared three different compounds that contain only iodine and fluorine and determined the mass of each element in each compound: Compound Mass of Iodine (g) Mass of Fluorine (g) 1 4.75 3.56 2 7.64 3.43 3 9.41 9.86 (b) How do the numbers in part (a) support the atomic theory?

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Textbook Question

Which of the subatomic particles in an atom does not have a charge (and was therefore the last to be discovered)?

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Textbook Question

An unknown particle is caused to move between two electrically charged plates, as illustrated in Figure 2.7. You hypothesize that the particle is a proton. (a) If your hypothesis is correct, would the particle be deflected in the same or opposite direction as the b rays?

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Textbook Question

Which set of statements is true about Rutherford’s gold foil experiment?

i. This is the main experiment that showed that atoms have a dense nucleus.

ii. The data from the experiment showed that alpha particles scattered equally at all angles from the gold foil.

iii. Electrons were emitted from the gold atoms in straight lines.


a. i only

b. ii only

c. iii only

d. i and ii

e. i and iii

Textbook Question

Millikan determined the charge on the electron by studying the static charges on oil drops falling in an electric field (Figure 2.5). A student carried out this experiment using several oil drops for her measurements and calculated the charges on the drops. She obtained the following data: Droplet Calculated Charge (C) A 1.60 * 10-19 B 3.15 * 10-19 C 4.81 * 10-19 D 6.31 * 10-19 (b) What conclusion can the student draw from these data regarding the charge of the electron?

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Textbook Question

Millikan determined the charge on the electron by studying the static charges on oil drops falling in an electric field (Figure 2.5). A student carried out this experiment using several oil drops for her measurements and calculated the charges on the drops. She obtained the following data: Droplet Calculated Charge (C) A 1.60 * 10-19 B 3.15 * 10-19 C 4.81 * 10-19 D 6.31 * 10-19 (c) What value (and to how many significant figures) should she report for the electronic charge?

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