One mole of a substance contains 6.02 × 1023 molecules. This number is known as _______.
Answer: reversible reaction
One mole of a substance contains 6.02 × 1023 molecules. This number is known as _______.
Answer: reversible reaction
Showing posts with label Small Molecules and the Chemistry of Life. Show all posts
Showing posts with label Small Molecules and the Chemistry of Life. Show all posts
Answer: reversible reaction
The amount of heat needed to raise one gram of a substance 1°C is known as _______.
The amount of heat needed to raise one gram of a substance 1°C is known as _______.
Answer: Avogadro's number
The water strider skates along the surface of water due to a property of liquids called _______.
The water strider skates along the surface of water due to a property of liquids called _______.
Answer: specific heat
In the equation C6H12O6 ? 6CO2 + 6H2O, C6H12O6 is the _______.
In the equation C6H12O6 ? 6CO2 + 6H2O, C6H12O6 is the _______.
Answer: surface tension
The attraction between a slight positive charge on a hydrogen atom and the slight negative charge of a nearby electronegative atom is a _______.
The attraction between a slight positive charge on a hydrogen atom and the slight negative charge of a nearby electronegative atom is a _______.
Answer: reactant
Of the different types of chemical bonds, the strongest bond in biological systems is the _______ bond.
Of the different types of chemical bonds, the strongest bond in biological systems is the _______ bond.
Answer: hydrogen bond
Molecules that have an unequal distribution of electric charge are called _______ molecules.
Molecules that have an unequal distribution of electric charge are called _______ molecules.
Answer: covalent
The electronegativity of an atom depends upon the number of _______ and how far the _______ are from the nucleus.
The electronegativity of an atom depends upon the number of _______ and how far the _______ are from the nucleus.
Answer: polar
The molecular weight of glucose (C6H12O6) is _______.
The molecular weight of glucose (C6H12O6) is _______.
Answer: protons; electrons
A _______ is two or more atoms linked by chemical bonds.
A _______ is two or more atoms linked by chemical bonds.
Answer: 108
The tendency of atoms in stable molecules to have eight electrons in their outermost shells is known as the _______.
The tendency of atoms in stable molecules to have eight electrons in their outermost shells is known as the _______.
Answer: molecule
______ occurs when one atom, such as 14C, is transformed into another atom, such as 14N, with an accompanying emission of energy.
______ occurs when one atom, such as 14C, is transformed into another atom, such as 14N, with an accompanying emission of energy.
Answer: octet rule
The chemical properties of an element are determined by the number of _______ its atoms contain.
The chemical properties of an element are determined by the number of _______ its atoms contain.
Answer: Radioactive decay
The sum of the atomic weights in any given molecule is called its _______.
The sum of the atomic weights in any given molecule is called its _______.
Answer: valance electrons
Every atom except for _______ has one or more neutrons in its nucleus.
Every atom except for _______ has one or more neutrons in its nucleus.
Answer: mass number
Oxygen and carbon are defined as different elements because they have atoms with a different number of _______.
Oxygen and carbon are defined as different elements because they have atoms with a different number of _______.
Answer: hydrogen
One dalton is the same as the mass of one _______.
One dalton is the same as the mass of one _______.
Answer: protons
Solutions that contain buffers tend to resist pH changes because buffers
Solutions that contain buffers tend to resist pH changes because buffers
a. are bases.
b. change from ionic to nonionic in solution.
c. change from nonionic to ionic in response to changes in pH and release or absorb H+.
d. are weak acids or bases.
e. are ionic polar molecules that add or absorb H+ in solutions.
Answer: C
Carbonic acid and sodium bicarbonate act as buffers in the blood. When a small amount of acid is added to this buffer, the H+ ions are used up as they combine with the bicarbonate ions. When this happens, the pH of the blood
Carbonic acid and sodium bicarbonate act as buffers in the blood. When a small amount of acid is added to this buffer, the H+ ions are used up as they combine with the bicarbonate ions. When this happens, the pH of the blood
a. becomes basic.
b. becomes acidic.
c. does not change.
d. is reversible.
e. ionizes.
Answer: C
The optimum pH for growing strawberries is 6.5, whereas the optimum pH for growing blueberries is 4.5. Therefore, the number of hydrogen ions needed to grow strawberries is _______ times the number needed for blueberries.
The optimum pH for growing strawberries is 6.5, whereas the optimum pH for growing blueberries is 4.5. Therefore, the number of hydrogen ions needed to grow strawberries is _______ times the number needed for blueberries.
a. 2
b. 10
c. 100
d. 1,000
e. 1,000,000
Answer: E
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