Multiple-Choice Homework Problem 1.2 How does the total number of electrons comp

Question

Multiple-Choice Homework Problem 1.2 How does the total number of electrons compare to the total number of protons in a neutral solid? Select One of the Following: (a) There are more electrons than protons. (b) There are an equal number of protons and electrons. (c) There are more protons than electrons. (d) The ratio is determined by the properties of the solid (e) A neutral object does not contain electrons. Multiple-Choice Homework Problem 1.3 The pith ball you will charge in lab develops a charge of about 1.00nC. How many electrons were transferred off the pith ball? Select One of the Following: (a) 6.00 x 10 17 (b) 6.24 x 100 (c) 6.02 x 10 (d) 1.10 x 1021 (e) 6.24 x 10 Multiple-Choice Homework Problem 1.4 You are given a bunch of electrons. Electrons have charge -e, but what does this mean? Select One of the Following: (a) The average charge of the electrons will be e, with the actual charge distributed around -e. (b) Most electrons will have charge of exactly -e, but some will have a charge that is slightly higher and some slightly lower (c) Regardless of conditions, all of the electrons have a charge of exactly -e.

Explanation / Answer

(1) In neutral atom negative charges should be equal to positive charges

and so number of electron would be equal to number of proton

option b is correct

(2) Total Charge = number of electron x charge on one electron

1.00 x 10-9 = n (1.6 x 10-19)

n = 0.625 x 1010 electrons

Option b is correct

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