Chemistry Flashcards
Molecules that can ionize in water and generate an electric current are called
electrolytes
Free radicals can be neutralized by
antioxidants
Which of the following is NOT an inorganic element of the human body?
Aluminum
Unstable atoms with unpaired electrons that can damage tissues are called
Free radicals
Which of the following is not a property of water?
It is an electrically neutral molecule
Which of the following best represents the normal pH range of human blood
7.35 - 7.45
A(n) ___________ resists changes in pH
buffer
Water stabilizes ions in solution by forming __________ around them.
hydration spheres
Which of the following is true about the different substances found in a mixture?
They each retain their own chemical properties
The basis for chemical reactions occurring is
molecular motion and collisions
Smaller molecules combine to create larger molecules in ________________ reactions, while large molecules are broken down into smaller ones in _______________ reactions, and atoms are exchanged in ________________ reactions.
synthesis; decomposition; exchange
__________________ reactions can go in either direction, and the direction of the reaction is determined by __________________.
reversible; the quantity of reactants on each side of the equation
Enzymes are an example of ____________, which work to _______________.
catalysts; speed up chemical reactions
Which of the following is NOT true of biological catalysts?
they speed up reactions without permanent change to themselves
they hold reactants in favorable positions to react
they get used up by the reactions they catalyze
they may change the shapes of reactants to make them react
they get used up by the reactions they catalyze
Catabolic reactions _________________
break bonds to release stored energy