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19 Cards in this Set
- Front
- Back
The atom of element phosphorus has 16 neutrons and 15 electrons. What is the atomic number for phosphorus atom? |
15 |
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The element helium has an atomic number of 2. Do you consider this element reactive or inert? |
Inert |
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Atoms gain or lose electrons from: A) ionic bonds B) covalent bonds C) hydrogen bonds |
A) ionic bonds |
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Ionic bond |
Chemical bond that consists of a strong mutual attraction between ions of opposite charge |
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Covalent bond |
Chemical bond in which two atoms share a pair of electrons |
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Chemical bond |
An attractive force that arises between two atoms when their electrons interact |
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Hydrogen bond |
Attraction between a covalently bonded hydrogen atom and another atom taking part in a separate covalent bond |
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The normal range of blood pH indicates: A) 7.3-7.5 B) 5.5-6.3 C) 7.8-8.3 D) above 8.5 |
A) 7.3-7.5 |
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Two atoms of oxygen are bonded together by a double covalent bond. How many electrons do they share? A) 2 B) 4 C) 6 D) 5 |
B) 4 |
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Protons |
Part of the atomic nucleus; have a positive charge |
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Neutrons |
Part of the atomic nucleus; neutral charge |
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Electrons |
Negative charge; quantity is equal to number of protons; move around nucleus |
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True or false, water is a great solvent for polar molecules? |
True, because of the electron arrangements in water molecules, a polarity results that allows water to form hydrogen bonds with one another and other polar substances. |
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True or false, in a polar covalent bond electrons are shared equally? |
False, in a polar covalent bond because atoms share the electrons unequally, there is a slight difference in charge between the two poles of the bond |
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Polar substances are hydro___? |
Hydrophilic (water loving) |
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Nonpolar substances are hydro___? |
Hydrophobic (water dreading); repelled by water |
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The pH scale is a measure of the __ concentration in a solution? |
H+ ; the greater the H+ the Lowe the pH scale |
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A substance that releases hydrogen ions in a solution: |
Acid |
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A substance that release ions such as hydroxide ions that combine with hydrogen ions: |
Base |