# Tutor profile: Ashten N.

## Questions

### Subject: Chemistry

a first order reaction has an initial concentration of 40 M and a half life of 2 hours. After 6 hours, how much of the initial concentration is left?

Half life is the amount of time it takes for half of the initial amount to decompose. In first order reactions, the half life stays constant. After 6 hours, 3 half lives have gone by (6/2). After the first half life, the concentration has decreased to 20 M. After the second half life, the concentration has decreased to 10 M. After the third half life, the concentration has decreased to 5 M so after 6hours, only 5 M of the initial concentration is left.

### Subject: Biology

You are told that a cell contains chloroplast, ribosomes, cell wall, but no centrioles. What kind of cell is it?

Plant cell

### Subject: Algebra

Sarah needs to make cupcakes for a bakesale. On the recipe, it says that for every dozen cupcakes, she will need 2 cups of flour. If Sarah wants to make 48 cupcakes, how many cups of flour will she need?

48 cupcakes = 4 dozen 1 dozen cupcakes will require 2 cups of flour 4x2 = 8 cups of flour

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