A photon has a frequency of 535 MHz. What is the energy of this photon? 1. 3.72 × 10−22 J

2. 1.78 × 10−6 J

3. 3.72 × 10−28 J

4. 0.561 J

5. 3.55 × 10−25 J

6. 5.61 × 1011 J

7. 3.55 × 10−31 J

8. 1.61 × 1011 J

9. 561000 J

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

What can be found in the ionosphere