HSU Intro to Biology Exam 1 Questions & Answers 2024/2025
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Course
HSU Intro to Biology
Institution
HSU Intro To Biology
HSU Intro to Biology Exam 1 Questions & Answers 2024/2025
Matter - ANSWERSanything that occupies space and has mass.
Elements - ANSWERSA substance that cannot be broken down into other substances by ordinary chemical means.
Of the 92 elements, how many are essential to life? - ANSWERS25
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HSU Intro to Biology Exam 1 Questions
& Answers 2024/2025
Matter - ANSWERSanything that occupies space and has mass.
Elements - ANSWERSA substance that cannot be broken down into other substances by ordinary
chemical means.
Of the 92 elements, how many are essential to life? - ANSWERS25
Of these 25 essential elements, 4 of these make up about 96% of the weight of most cells. They are: -
ANSWERSOxygen
Nitrogen
Carbon
Hydrogen
The remaining 4% of elements is composed of 7 more elements which you are probably familiar with
which are called: - ANSWERSTrace elements
What element is the cause of a deficiency or excess that can cause thyroid problems? - ANSWERSIodine
What element is the cause of a deficiency or excess that can cause tooth decay? - ANSWERSFluorine
The smallest unit of matter that still retains the properties of an - ANSWERS(Atom) original substance like
air.
Atomic number - ANSWERSThe amount of protons in an atom
, Mass number - ANSWERSa measurement of the total number of protons and neutrons in an element. A
measurement of the amount of material in an atom.
The innermost shell can accommodate __ electrons - ANSWERS2
The second shell can accommodate for __ electrons - ANSWERS8
Atoms enable bonding by either __ electrons, or __ electrons, thus forming chemical bonds between
atoms. - ANSWERSTransferring; sharing
Covalent bonds form as a result of the __ of the outer shell electrons
Hold atoms together in a __
The number of covalent bonds an atom can form is equal to the number of additional __ needed to fill
the outer shell. - ANSWERSSharing
Molecule
Avalents
Covalent bonds - non polar
When electrons are shared equally, the resultant molecule is uncharged.
Ex. __ gas, __ gas - ANSWERS
Hydrogen bonds
Because water is __ molecule, there exists __ electrical charges between neighboring molecules -
ANSWERSPolar
Weak
pH scale measures - ANSWERSconcentration of hydrogen ions in a solution
acid - ANSWERSA compound that donates hydrogen ions to a solution
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