Tutor profile: Ian V.
What is the substance called that causes an alteration of the speed of a chemical reaction? A: variable B: gas C: catalyst D: equilibrium constant
What do you think the answer is? Oh, you are confused by the question. Let me clarify it for you. Basically they are asking what options below can change the speed of a chemical reaction. Go through them systematically, can a variable change the speed of a chemical reaction? maybe... but lets check the other answers. Can a gas change the speed of a reaction, no. Can a catalyst change the speed of a reaction, yes! What does a catalyst do? It changes the activation energy, good. The last option is an equilibrium constant, if it is at equilibrium will a reaction occur, no, correct. So the answer is (C). Great!!!
When the chromosomes line up in mitosis this is known as which phase? A) Telophase B) Anaphase C) Metaphase D) Prophase
What do you think the answer is? Don't have any idea huh... Okay, lets go over mitosis in its entirety. Mitosis is the process of cell division. To divide, a cell must replicate all its DNA to have one replicate to go into each daughter cell. The phases of mitosis go, prophase, metaphase, anaphase and teloophase, each phase correspondences to changes in the DNA. In prophase, the DNA divides. In metaphase, the DNA lines up in the middle of the cell. In anaphase, the DNA moves away from each other to opposite sides, each going to its own cell. In telophase, the cells split into individual daughter cells. So in which phase do the chromosomes line up? Yes, in metaphase! Remembering the phases is tough, its basically memorization, but the more you go over the phases of mitosis, the easier it will be to remember what each phase looks like. I would recommend making some flash cards, or using online flash cards.
Simplify: (x^4 / x^3)^3
What can you remove, or change from this equation to simplify it? Remember, everything you do to the numerator must be done to the denominator. One thing you may do to this equation is distribute the 3rd power, that would give you X^12/X^9. So, it is getting simpler now, but more can be done. With these simplify problems you want to get as simple as possible. Yes, the next thing you should do is divide X^12 by X^9. That would give X^3, that is the simplest you can make this equation. Simplifying an equation makes the equation easier to solve, it takes less steps to solve X^3 than it does to solve the original equation, that's why we learn to simplify equations.
needs and Ian will reply soon.