Ques:Q: The boiling points of liquid also correlate to the strength of which forces? Read this paragraph and choose the correct option from the provided answers: The boiling points of liquid also correlate to the strength of the intermolecular forces. Recall that diethyl ether has weak dispersion forces, which meant that the liquid has a high vapor pressure. The weak forces also mean that it does not require a large an input of energy to make diethyl ether boil and so it has a relatively low normal boiling point of 34.6C. Water, with its much stronger hydrogen bonding, has a low vapor pressure and a higher normal boiling point of 100C. Choices: - centrifugal - supramolecular - gravitational - intermolecular A:

Ans:intermolecular
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Ques:Q: What is the basic unit of matter? Read this paragraph and choose the correct option from the provided answers: The basic unit of matter is an atom . At the center of an atom is its nucleus . Protons are positively charged particles in the nucleus. Also in the nucleus are neutrons with no electrical charge. Orbiting the nucleus are tiny electrons. Electrons are negatively charged. An atom with the same number of protons and electrons is electrically neutral. If the atom has more or less electrons to protons it is called an ion . An ion will have positive charge if it has more protons than electrons. It will have negative charge if it has more electrons than protons. Choices: - neutrons - calories - ions - atoms A:

Ans:atoms
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Ques:Q: What is it that surrounds cells and serve to keep the insides separated from the outsides? Read this paragraph and choose the correct option from the provided answers: Membranes Biological membranes surround cells and serve to keep the insides separated from the outsides. They are formed of phospholipid bilayer1 s, which by definition are a double layer of fatty acid2 molecules (mostly phospholipid3 s, lipids containing lots of phosphorus). Proteins4 serve very important functions in cellular membranes. They are active transports in and out of the cell, acting as gatekeepers. They relay signals in and out of the cell. Proteins are the site of many enzymatic reactions in the cell, and play a role in regulation of cellular processes. Choices: - inner membranes - abundant membranes - similar membranes - biological membranes A:

Ans:biological membranes
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Ques:Q: The electrochemical potential across a membrane determines the tendency of an ion to do what? Read this paragraph and choose the correct option from the provided answers: The electrochemical potential across a membrane determines the tendency of an ion to cross the membrane. The membrane may be that of a cell or organelle or other sub cellular compartment. The electrochemical potential arises from three factors:. Choices: - attach to the membrane - move away from the membrane - destroy the membrane - cross the membrane A:

Ans:
cross the membrane
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