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bio unit 7 assesment
Terms in this set (60)
uniform mixture of two or more substances
a substance that dissolves another substance
electrically charged atom
anything that takes up space and has mass
range of numbers that is used to describe how acidic or basic a solution is
substance that is dissolved in a solution
a ________________ _________________ is. a weak attraction between a hydrogen atom of one molecule and a slightly negative atom of another molecule.
the starting materials for a chemical equation are ___________.
a _________ is a uniform mixture of water and another substance.
____________ ______________ are needed in large amounts in organisms
______ naturally-occuring elements are essential to living organisms.
an element is a substance that ______ be broken down into simpler substances.
most elements are abbreviated be a ______ or _______ letter symbol.
one or two
A water molecule contains two _________ _________ _________.
polar covalent bonds
In a water molecule, electrons are shared __________ between the hydrogen atoms and oxygen atoms.
The unequal sharing of electrons is referred to as a ________ ___________ bond.
_______ is an example of a surfactant.
Plants use ________________ _____________ to more water from the roots to the leaves.
Ice floats on water because its molecules are _______ densely packed than liquid water.
a molecule ill which opposite ends have opposite electric charges
a solution that has many H+ ions
the tendency of molecules of the same kind to stick together
a substance that cannot be broken down to other substances by chemical means
a substance that had a pH above 7
the element represented with the letter k
two or more elements covalently bonded
the starting materials in a chemical equation
an element is defined as a pure substance because it is made up of only one kind of ...
atoms bond with other atoms because ....
bonding helps atoms become more stable
then a group of atoms is held together by covalent bonds, ....
a molecule is formed
acids and bases differ in that ....
acids dissolved in water form more hydrogen ions than bases dissolved in water.
What are the products in the reaction (C6H12O6 + 602 --- 6CO2 + 6H2O)
6CO2 and 6H20
What are the reactants in the reaction (C6H12O6 + 602 --- 6CO2 + 6H2O)
C6H206 and 6CO2
What does the arrow mean in the chemical equation?
the smallest unit of matter that cannot be broken down by chemical means
identifies element arrangment in a molecule
the measure of concentration of hydrogen ions in a solution
A group of atoms held together by covalent bonds.
shows the rearrangement of atomic elements in a chemical reaction
identifies types and number of elements in a molecule
an attraction between substances of the same kind
an attraction between different substances
compound that forms hydrogen ions when disolved in a solution
(molecule or element) a substance that can be broken down in a chemical reaction
(molecule or element) H2O, a liquid that no longer resembles either hydrogen or oxygen atoms
(molecule or element) carbon, the substance represented by the symbol C
(molecule or element) carbon dioxide, CO2
(molecule or element) gold, s substance that cannot be broken down further
this subatomic particle has a negative charge
this subatomic particle has a positive charge
this subatomic particle has no charge
this subatomic petiole is shared in covalent bonds
These two subatomic particles are found in the nucleus
protons and neutrons
this subatomic particle is found outside the nucleus
what property of water? water forms a meniscus in a graduated cylinder
water bonds to itself and other substances
what property of water? allowed the pH scale to be developed
water forms ions easily
what property of water? water has one end that has a negative charge and one end that has a positive charge
water is a polar molecule
what property of water? fish in the courtyard pond are still alive in February
water has a low density when frozen
what property of water? sugar is evenly distributed in hot tea
water is a powerful solvent
what property of water? a larger pot of water takes a long time to boil
water has high heat of vaporization
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