It is based on the concept of strength of acids and bases (NON-OXO) down the group.
A hydrogen bonded to an atom is more acidic due to two reasons:

1)More electronegative atom pulls  electron density from hydrogen and releases it as a proton(H+).

2) Big sized atoms make longer bonds with hydrogen which are weaker and easy to break. So these hydrogens are also more acidic because they come out easily as proton(H+) .

In this question atoms have same electronegativity so we will compare the sizes.

Smallest atom will make smallest bond and strongest bond. It will be difficult to break bond of hydrogen with the atom so it becomes weakest acid.

Size order is - down the group size increase because new shells are added.

O < S < Se < Te

Hi, I was confused about this question, so I submitted it, and it said the correct answer was tellurium. Could you explain why? I'm a bit confused.

nevermind! I got it to work!

hi, this quiz keeps showing an error. Every time I click on it, the screen looks like this.

it was of silver chloride (AgCl)

she said it was okay, but just wondering, am I missing anything ?

Oh, so basically, she said that it's not a heating and cooling curve (but the example she showed is a heating and cooling curve, so I just did that ). I will send an image of it.

Quote from: Krista on May 04, 2025, 11:57:05 PMHi Dr. Uma,

I don't understand question 40. I got the final value of 14.9 or around 15 degrees Celsius, so I would assume that the answer would be c (greater than 14). However, the answer key says that it is B. How come?

 

There is no need of calculations here.
Water is at 14 degree C and Octane is at 13 degree C and Heat is transferred from water to octane then temperature should be  between 13 and 14.You must have done some sign error in calculation. However no calculations are needed for this question.

Quote from: Krista on May 05, 2025, 12:04:27 AMHi Dr. Uma,

I don't understand question 33. Isn't neon an inert gas? Why would it affect the reaction quotient and the reaction rate? What kind of situation is this? When I did other equilibrium problems, inert gases wouldn't affect the reaction. 

This is a rigid container so inert gas which is not the part of K expression can not shift the equilibrium as K is not becoming Q.

Hi Dr. Uma,

I don't understand question 33. Isn't neon an inert gas? Why would it affect the reaction quotient and the reaction rate? What kind of situation is this? When I did other equilibrium problems, inert gases wouldn't affect the reaction.