What does below chemistry rebus means?

Can you find the dog hidden in a group of pandas?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

There are three boxes. One is labeled "APPLES" another is labeled "ORANGES". The last one is labeled "APPLES AND ORANGES". You know that each is labeled incorrectly. You may ask me to pick one fruit from one box which you choose.

How can you label the boxes correctly?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

Move three sticks of the spiral below to form a square.

Which digit occurred maximum times between the number 1 and 1000?