Answer the following question given this paragraph: H2 + O2 H2O This is an example of a chemical equation, which is a concise way of representing a chemical reaction. The initial substances are called reactants, and the final substances are called products. Unfortunately, it is also an incomplete chemical equation. The law of conservation of matter says that matter cannot be created or destroyed. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms. But if we count the number of oxygen atoms in the reactants and products, we find that there are two oxygen atoms in the reactants but only one oxygen atom in the products. What can we do? Can we change the subscripts in the formula for water so that it has two oxygen atoms in it? No; you cannot change the formulas of individual substances because the chemical formula for a given substance is characteristic of that substance. What you can do, however, is to change the number of molecules that react or are produced. We do this one element at a time, going from one side of the reaction to the other, changing the number of molecules of a substance until all elements have the same number of atoms on each side. To accommodate the two oxygen atoms as reactants, let us assume that we have two water molecules as products:. Q: Initial substances are called reactants, and the final substances are called what? Choices: - exports - imports - reactors - products A:
products
(Question)
Answer the following question given this paragraph: There are several types of radioactive decay, including alpha, beta, and gamma decay. In all three types, nuclei emit radiation, but the nature of the radiation differs. The Table below shows the radiation emitted in each type of decay. You can watch a video about the three types at this URL: http://www. youtube. com/watch?v=3koOwozY4oc . Q: What is emitted by nuclei in alpha, beta, and gamma decay? Choices: - convection - solar energy - magnetic field - radiation A:
(Answer)
radiation
Ques: Answer the following question given this paragraph: 17.8 Gonadal and Placental Hormones The male and female reproductive system is regulated by follicle-stimulating hormone (FSH) and luteinizing hormone (LH) produced by the anterior lobe of the pituitary gland in response to gonadotropin-releasing hormone (GnRH) from the hypothalamus. In males, FSH stimulates sperm maturation, which is inhibited by the hormone inhibin. The steroid hormone testosterone, a type of androgen, is released in response to LH and is responsible for the maturation and maintenance of the male reproductive system, as well as the development of male secondary sex characteristics. In females, FSH promotes egg maturation and LH signals the secretion of the female sex hormones, the estrogens and progesterone. Both of these hormones are important in the development and maintenance of the female reproductive system, as well as maintaining pregnancy. The placenta develops during early pregnancy, and secretes several hormones important for maintaining the pregnancy. Q: The male and female reproductive system is regulated by follicle-stimulating hormone (fsh) and luteinizing hormone (lh) produced by what gland? Choices: - thyroid - testes - adrenal - pituitary A:
Ans: pituitary
(Q).
Answer the following question given this paragraph: Triglycerides function as a long-term storage form of energy in the human body. Because of the long carbon chains, triglycerides are nearly nonpolar molecules and thus do not dissolve readily in polar solvents such as water. Instead, oils and fats are soluble in nonpolar organic solvents such as hexane and ethers. Q: What substances function as a long-term energy store in the human body and possess long carbon chains that prevent dissolving in water? Choices: - hydrocarbons - steroids - nanoparticles - triglycerides A:
(A).
triglycerides
Ques:Answer the following question given this paragraph: Nervous tissue is made up of nerve cells that sense stimuli and transmit signals. Nervous tissue is found in nerves, the spinal cord, and the brain. Q: What is made up of nerve cells that sense stimuli and transmit signals? Choices: - muscle tissues - blood tissue - dependent tissue - nervous tissue A:

Ans:nervous tissue
Question: Answer the following question given this paragraph: Q: Temperature and what other environmental factor are important in the activity of an enzyme? Choices: - size - shape - color - ph level A:
Answer:
ph level