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Units and Measurement (Section)(a) A sample of

Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward ISBN: 9780321696724 27

Solution for problem 27E Chapter 1

Chemistry: The Central Science | 12th Edition

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Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward

Chemistry: The Central Science | 12th Edition

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Problem 27E

Units and Measurement (Section)(a) A sample of tetrachloroethylene, a liquid used in dry cleaning that is being phased out because of its potential to cause cancer, has a mass of 40.55 g and a volume of 25.0 mL at 25 °C. What is its density at this temperature? Will tetrachloroethylene float on water? (Materials that are less dense than water will float.) (b) Carbon dioxide (CO2) is a gas at room temperature and pressure. However, carbon dioxide can be put under pressure to become a “supercritical fluid” that is a much safer dry-cleaning agent than tetrachloroethylene. At a certain pressure, the density of supercritical CO2 is 0.469 g/cm3. What is the mass of a 25.0-mL sample of supercritical CO2 at this pressure?

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Chapter 43—Reproduction and Embryonic Development  Surrogate—woman is not able to carry a baby, so a surrogate mother is used  Test-tube baby—child is created in petri dish and inserted into woman  Implantation—most important part of pregnancy; when the embryo attaches itself to the wall of the uterus  Modes of Reproduction o Asexual  Creation of genetically identical offspring by one parent  Very rapid form of reproduction  Less genetic variation because there is only one parent involved in the process  Can occur via  Budding—new individual forms from adult; sometimes bud stays attached, but most the time it falls off and becomes its own adult  Fission—animal splits in two  Fragmentation—pieces if an animal grow into a new adult  Parthenogenesis—formation of new individual by unfertilized eggindividual is sterile (tadpole) o Sexual reproduction  Joining of gametes  Eggs and sperm o Some animals have both modes o Some animals exhibit hermaphroditism – individual has both male and female reproductive systems o Makes it easier to find a mate o May exchange gametes with other individuals o May fertilize their own eggs o Sexual reproduction results in the generation of unique offspring o External fertilization (spotting)  Gametes distributed outside of the animal  When eggs and sperm are discharged near each other  Many fish and amphibian species o Internal fertilization  Sperm is deposited in or near the female reproductive tract  Some fish and amphibians and most terrestrial species  Human Reproduction o Both sexes have  A set of gonads  Ducts for gamete transport  Structures for copulation  Male Reproduction o Testes produce sperm and male hormones o Epididymis stores sperm as they develop further o LH stimulates testes—testosterone production  Leydig cells o FSH controlled by pituitary—sperm production  Sertoli cells facilitate spermatogenesis o Men can produce sperm until death o Several glands contribute to semen  Seminal vesicles  Prostate gland  Bulbourethral glands o During ejaculation  Sperm is expelled from the penis  Seminal vesicles, prostate, and bulbourethral glands secrete into the urethra  Semen is formed and expelled o Sperm production  Is regulated by a negative feedback system of hormones  Involves the hypothalamus  Anterior pituitary  Testes  Female Reproduction o System that allows for pregnancy o Hormones synchronize cyclic changes in the ovary and uterus o About every 28 days  The hypothalamus signals the anterior pituitary to secret FSH and LH  Trigger the growth of a follicle and ovulation o After ovulation, the ovarian follicle becomes the corpus luteum o The corpus luteum secretes estrogen and progesterone which  Stimulate the endometrium to thicken (lining of the uterus)  Prepare the uterus for implantation  Inhibit the hypothalamus, reducing FSH and LH o If the egg is fertilized  The embryo releases hormones that maintain the uterine lining and menstruation does not occur  First 3 months are embryonic stage  Next 6 months are fetal development o If the egg is not fertilized  The drop in LH shuts down the corpus luteum and its hormones  Menstruation is triggered and the hypothalamus and pituitary stimulate development of a new follicle o Hypothalamus controls anterior pituitary, which produces FSH and LH o FSH and LH spike around day 14  LH peak triggers ovulation and corpus luteum formation

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Chapter 1, Problem 27E is Solved
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Textbook: Chemistry: The Central Science
Edition: 12
Author: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward
ISBN: 9780321696724

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Units and Measurement (Section)(a) A sample of