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BIO Ch. 2

chapter 2 final

The 6 basic life elements SCHNOPS sulfur, carbon, hydrogen, nitrogen, oxygen, phosporus
All isotopes have the same number of ___ protons
What type of bond is formed when atoms share electrons? Covalent
Aquatic living things are able to survive the winter thanks to which property of water? It is less dense as a solid than as a liquid
The three isotopes of carbon 12C, 13C, and 14C have different numbers of ____? neutrons
The combined number of _____ will determine the number of electrons in orbital(s) around a neutral atom. protons
If an atom has an atomic number of 17 and a mass number of 35, the number of neutrons in its nucleus equals ___? 18 (atomic number = protons) mass minus protons= neutrons.
An electrically neutral atom with an atomic number of 7 will have ____ occupied electron shell(s). 2
Which bond is most easily broken? a hydrogen bond
There are two ____ _____ bonds in water. polar covalent
hydrophobic molecules tend to be _____. nonpolar
The two parallel strands of DNA are held together by ____ bonds hydrogen
Hydrogen bonds form when ______. a slightly negative atom is attracted to a slightly positive atom.
The atom that has a nucleus with no neutrons is ____. hydrogen
How many naturally occurring elements are there? 92
Atomic mass is the sum of ____ and _____. protons and neutrons
If the atomic mass is 15 and you have 8 protons, how many neutrons do you have? 7
The atomic number of Na is 11, how many protons does Na have? 11
If an element has 3 protons, how many electrons does it have? 3
What is the Electric charge of an electron? -1
What is the Electric charge of a proton? +1
Proton, neutron, electron- Which ones contribute to the AMU? Which ones are located in the nucleus? Which one is located in the outer shell? What is that shell called? protons & neutrons, protons & neutrons, electrons, electron shell
What is it called when the atoms of the same element differ in the number of neutrons, but the number of protons and electrons stay the same? isotopes
What is the octet rule? 2 electrons are allowed in the 1st shell and each one there after are allowed a max of 8 electron
One the periodic table the horizontal rows are called? Vertical rows are called? periods, groups
What column of the periodic table are noble gases? Why are they stable-inert and rarely react with another atom? VIII, the last shell has 8 electrons and do not bond with another element
What type of bond do you call when an atom loses an electron to another atom? When an atom loses an electron, does it become + charged or – charged? ionic bond, +
What type of bond do have when electrons are shared? covalent
When 2 atoms are put together they make? Is an atom on it’s own make it an element? Molecule? molecules, yes, no
Covalent bonds, when atoms share an equal amount of electrons…example to hydrogens bonding-Is it polar or non-polar? non-polar
Covalent bonds- when atoms share an unequal amount of electrons…example H20-Is it polar or non-polar? polar
Referring to the outershell, an electron sharing and moving releases energy is called? chemical reaction
If something has a pH lower than 7, it is _______. If something has a pH higher than 7.1 it is ______. acidic, base or alkyline
What allows water molecules to hold onto each other without separating? cohesion
Water molecules has +/- charges, which allows them to _______ to polar surfaces, which is called? adhere, adhesion
Created by: nicoleinsd