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HSU Intro to Biology Exam 1 Questions & Answers 2024/2025
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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 ...

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  • November 18, 2024
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  • 2024/2025
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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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