Atomic theory questions

The Chapter 2 in-class questions. Check each part as you go. Every answer is saved on this device, and after a miss you can show the answer with a short reason.

Question 1

Which of the following statements of the atomic theory proposed by John Dalton at the beginning of the 19th century are not quite true in light of modern atomic physics? How could each statement be altered to reflect the current understanding of the atomic theory?

Part 1. Select every statement that is not quite true today.

If you think every statement still holds, check with nothing selected.

Part 2. How could each one be altered? Choose the version that matches the modern theory.

Finish part 1 first.

Question 2

The fact that LiBr is 7.99% lithium and 92.01% bromine by mass regardless of its origin is an example of _______.

Question 3

In mass spectrometry, species are separated based on _____.

Question 4

Nitrogen forms several compounds with oxygen. Measurements of the masses of nitrogen and oxygen that form upon decomposing these compounds indicates that one compound contains 2.28 g of oxygen for every 1.00 g of nitrogen, while the other compound contains 0.570 g oxygen for every 1.00 g of nitrogen. Calculate the simplest whole number ratio.

First compound: 2.28 g O per 1.00 g N
Second compound: 0.570 g O per 1.00 g N

Part 1. Ratio of the oxygen masses, first compound to second, as a decimal.

Type a number or an expression.

Part 2. Simplest whole-number ratio of the oxygen masses.

first : second

Question 5

Which scientist is correctly matched with the discovery for which he is known? For the incorrect pairings, how can they be fixed?

Part 1. Select every pairing that is correct.

If you think none of them are right, check with nothing selected.

Part 2. Fix the incorrect pairings: choose what each scientist is actually known for.

Finish part 1 first.