Explanation:
When you rub a plastic ruler and bring it closer to a tissue, the piece of tissue is forced to attach to the ruler because of some electricity.
Answer:
The change in entropy in the system is -231.5 J/K
Explanation:
Step 1: Data given
The normal boiling point of ethanol (C2H5OH) is 78.3 °C = 351.45 K
The molar enthalpy of vaporization of ethanol is 38.56 kJ/mol = 38560 J/mol
Mass of ethanol = 97.2 grams
Pressure = 1 atm
Step 2: Calculate the entropy change of vaporization
The entropy change of vaporization = molar enthalpy of vaporization of ethanol / temperature
The entropy change of vaporization = 38560 J/mol / 351.45 K
The entropy change of vaporization = -109.72 J/k*mol
Step 3: Calculate moles of ethanol
Moles ethanol = mass / molar mass ethanol
Moles ethanol = 97.2 grams / 46.07 g/mol
Moles ethanol = 2.11 moles
Step 4: Calculate change in entropy
For 1 mol = -109.72 J/K*mol
For 2.11 moles = -231.5 J/K
The change in entropy in the system is -231.5 J/K
Answer:
Cells divide to reproduce. There are two primary methods used, one for somatic cells, which compose the organism’s body, and one for reproductive cells, or gametes.
Scientists call the process of somatic cell division mitosis. Mitosis has six distinct steps in which the cell organizes and copies the DNA in the nucleus. Once copied, each new cell has its own copy of the DNA. The six steps of mitosis are prophase, prometaphase, metaphase, anaphase, telophase and cytokinesis. Some authorities consider the non-dividing portion of the cell’s lifecycle, known as interphase, to be one of seven steps involved in mitosis; however, interphase cells are not actively dividing.
Sex cells, such as sperm or eggs, must divide differently. Sex cells only possess one-half of the DNA that makes up a new animal. That way, when they combine, the resulting organism gets half of its DNA from its mother and half from its father. Because sex cells only want half of the DNA in each cell, they go through a different division process called meiosis. In meiosis, the cells split a second time, which yields four daughter cells rather than two as with mitosis; however, this provides each daughter cell with 23 chromosomes in contrast to the 46 chromosomes in somatic cells.
Answer:
Be^2+ ion
Explanation:
Be(OH)x^y- ions and Be(OH)2 solid
Ships only go a couple meters under water so their hull is not required to go so far underwater. A submarine goes much lower which means there is much more pressure on the hull which requires a bigger hull.
