Untitled Flashcards

Front

1. According to the second law of thermodynamics, label the beaker with the highest and the lowest entropy. 

Back

Lowest entropy because most ordered.

Highest entropy because most disordered

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Back

Front

a.Which atoms represent isotopes? 

b.What is the correct isotope notation for atom 3?

c.What is the mass number of atom 4?

Back

A. 1 & 3   *isotopes are same element, different # of neutrons

B. 14/C/6

C. (7+8=15)   mass number is 15.

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Back

Front

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Front

As Wavelength decreases, frequency (?) What is the relationship between Frequency & Wavelength? (?)

Back

1. 1. Increase

2. 2. inverse

Front

As Frequency increases, Energy (?) What is the relationship between Frequency and Energy? (?)

Back

1. Increases

2. 2. direct

Front

1. Which wave on the electromagnetic spectrum has the: 

Back

 highest frequency? Gamma

most energy? Gamma

largest wavelength? Radio

Front

3. The element carbon has three known isotopes: Carbon-12, Carbon-13, and Carbon-14. Carbon has an average atomic mass of 12.011. Based on this information, which isotope of carbon is the most abundant in nature? Justify your answer. 

Back

Carbon-12 is the most abundant in nature because its mass is closest to the average atomic mass. Since average atomic mass is a weighted average, the mass that is closer to the average atomic mass is most abundant.  

Front

1. Before calculating: what is the estimated average atomic mass? 

Back

Since Magnesium 24 has the highest percent, then we can estimate that the average atomic mass is close to 24 amu.