The placenta secretes progesterone and estrogen during pregnancy. Progesterone is responsible for th

The placenta secretes progesterone and estrogen during pregnancy. Progesterone is responsible for the following functions: • maintains the lining of the uterus • inhibits (interferes with) contractions of the uterus • inhibits the production and release of eggs Describe one likely result if the placenta became damaged and could not maintain progesterone levels. Support your answer. [1] The text above states three functions of progesterone. If placenta is damaged and can not maintain progesterone levels then the uterus lining will not be able to maintained, uterus will start contacting, and eggs will be produced and released. Any of these answers will be correct for the question above. Expl

Half-life problems

Nuclear chemistry is the last topic students learn in their chemistry classes. It is an important topic for the chemistry regent. The two sections in nuclear chemistry that have the most questions on the regent exam are balancing nuclear equations and doing half life problems. Half life is the amount of time it takes for the substance to become one half of its initial value. For example, if substance x has a half life one day and starts out as 100 grams, in one day, there will be 50 grams of it is left. On the Reference table, students can find different radioisotopes with their respective half lives and modes of decay that can be found on Table N. Therefore, if the question sounds like a ha

Transformation Tutoring guide to surviving finals.

It is this time of the year again. Finals are upon us. Students are feeling overwhelmed and stressed. We have developed a guide for our students to use to feel less stressed during the finals and ace their tests. Here we go: 1. Make a list of everything you need to cover broken down by subject. For example: Chemistry 1. Do first practice final 2. Do second practice final 3. Redo old tests 4. Redo quizzes 5. Redo HW's 2. Make sure to list everything in order of priority, so you can make sure you do what's most important first and don't have to cram it in. 3. Take breaks. Don't pull all nighters. For every two hours of studying, take a fifteen to a thirty minutes break. Treat yourself to a s

Free preparation for Chemistry Regent Exam

All students in public schools in New York state are required to take Regents. Chemistry regent is a three hour test that consists of 85 questions, 50 of which are multiple choice and the rest are short responses. Chemistry regent covers the topics of: Atomic Concepts, Periodic Table, Moles/Stoichiometry, Chemical Bonding, Physical Behavior of Matter, Kinetics/Equilibrium, Organic Chemistry, Oxidation-Reduction, Acids, Bases and Salts and Nuclear Chemistry. To review these topics students can go to online sources such as Khan Academy. At Transformation Tutoring we recommend for our students to prepare for the Chemistry Regent as well as any other Regent by doing official past tests. The stu

An organ, such as a kidney, used for transplant needs to be tested for compatibility with the person

An organ, such as a kidney, used for transplant needs to be tested for compatibility with the person who is to receive the organ. If this is not done, the (1) donated organ might attack the body (2) donated organ might attack the immune system (3) immune system might attack its own body cells (4) immune system might attack the donated organ Answer and explanation Organ transplants are used widely for those people, whose organs have been damaged and can not function properly, or have failed completely. It is necessary to test the donor organs for compatibility with the person who is receiving the organ because, if immune system doesn't recognize the organ, it might consider it as a foreign o

Practice AP Chemistry questions.

AP Chemistry is a college level chemistry exam covering a variety of chemistry topics. Lets practice with some questions to get a taste of the exam. 1. In solid methane, the forces between neighboring molecules are best characterized as a. ionic b. covalent c. hydrogen bonds d. ion-dipole forces e. London dispersion forces Methane, CH4 is a non polar molecule. The forces between neighboring molecules are called intermolecular forces. A nonpolar molecule has only London dispersion forces and therefore choice e is the correct answer. 2. How many carbon atoms are contained in 2.8g of C2H4? In order to calculate atoms, we must first get moles using the molar mass, and then convert them to atoms