Bio 181 Unit 1 Exam with all Correct & 100% Verified
Answers |Actual Complete Exam |Already Graded A+
Hypothesis ✔Correct Answer--a possible explanation for an observation
A hypothesis.. ✔Correct Answer---must be tested to determine its validity
-is often tested in many different ways
-allows for predictions to be made
Experiment ✔Correct Answer--tests the hypothesis
An experiment... ✔Correct Answer---must be carefully designed to test only one variable at a time
-involves an independent and a dependent variable
-consists of a test experiment and a control experiment
If the hypothesis is valid... ✔Correct Answer--you should be able to predict the results of the
experiment
Scientific inquiry ✔Correct Answer--Observation
Question
Hypothesis
Experiments
Conclusion
Theory/Law
Matter ✔Correct Answer--anything that occupies space and has mass
What is matter composed of? ✔Correct Answer--atoms that are composed of protons, neutrons
and electrons
Where are protons found? ✔Correct Answer--Nucleus
Where are neutrons found? ✔Correct Answer--Nucleus
Where are electrons found? ✔Correct Answer--In orbitals around the nucleus
Chemical element ✔Correct Answer--substance that cannot be broken down to other substances
by ordinary chemical means
How many elements are there? ✔Correct Answer--92
How many elements are important to life? ✔Correct Answer--25
What elements make up 96% of air on Earth? ✔Correct Answer--Caron, Hydrogen, Oxygen and
Nitrogen
Compound ✔Correct Answer--any pure substance which contains atoms of 2 or more different
elements
, Ex of compound ✔Correct Answer--Sodium chloride
Compounds are held together by... ✔Correct Answer--Ionic or covalent bonds
Ionic bonds ✔Correct Answer--The loss or gain of electrons will make ions which are attracted to
each other if oppositely charged
Ionic bonds have... ✔Correct Answer--unfilled shells
Are ionic bond weak or strong? ✔Correct Answer--Weak
Covalent bonds ✔Correct Answer--atoms incompletely filled valence electron shells share
electrons between them
Are covalent bonds weak or strong? ✔Correct Answer--Strong
Ionic/covalent bonds are... ✔Correct Answer--chemical bonds
Isotopes ✔Correct Answer--atoms of the same element that have different atomic mass #s due to
different #s of neutrons
Valence electrons ✔Correct Answer--electron(s) in the outermost shell
What are VE responsible for? ✔Correct Answer--chemical properties of the atom
What determines the mass of an element? ✔Correct Answer--Protons and neutrons
Periodic table ✔Correct Answer--arranges all elements according to atomic #s
How many electrons can the first energy level hold? ✔Correct Answer--2, can have 1
How many electrons can the 2nd energy level hold? ✔Correct Answer--8, can have >8
How many electrons can the 3rd energy level hold? ✔Correct Answer--8, can have >8
Orbital rules ✔Correct Answer--electrons occupy certain regions in space according to energy
levels and in pairs
Bohr model ✔Correct Answer--showing all electrons
Lewis dot diagram ✔Correct Answer--showing only valence electrons
Elements with filled VE are... ✔Correct Answer--chemically nonreactive or electronically stable
Atoms without filled valence levels either... ✔Correct Answer--give away or obtain electrons
Electronegativity ✔Correct Answer--attraction of an atom for the valence electrons of another
atom
Elements that are electronegative... ✔Correct Answer--pull the electrons towards them
Answers |Actual Complete Exam |Already Graded A+
Hypothesis ✔Correct Answer--a possible explanation for an observation
A hypothesis.. ✔Correct Answer---must be tested to determine its validity
-is often tested in many different ways
-allows for predictions to be made
Experiment ✔Correct Answer--tests the hypothesis
An experiment... ✔Correct Answer---must be carefully designed to test only one variable at a time
-involves an independent and a dependent variable
-consists of a test experiment and a control experiment
If the hypothesis is valid... ✔Correct Answer--you should be able to predict the results of the
experiment
Scientific inquiry ✔Correct Answer--Observation
Question
Hypothesis
Experiments
Conclusion
Theory/Law
Matter ✔Correct Answer--anything that occupies space and has mass
What is matter composed of? ✔Correct Answer--atoms that are composed of protons, neutrons
and electrons
Where are protons found? ✔Correct Answer--Nucleus
Where are neutrons found? ✔Correct Answer--Nucleus
Where are electrons found? ✔Correct Answer--In orbitals around the nucleus
Chemical element ✔Correct Answer--substance that cannot be broken down to other substances
by ordinary chemical means
How many elements are there? ✔Correct Answer--92
How many elements are important to life? ✔Correct Answer--25
What elements make up 96% of air on Earth? ✔Correct Answer--Caron, Hydrogen, Oxygen and
Nitrogen
Compound ✔Correct Answer--any pure substance which contains atoms of 2 or more different
elements
, Ex of compound ✔Correct Answer--Sodium chloride
Compounds are held together by... ✔Correct Answer--Ionic or covalent bonds
Ionic bonds ✔Correct Answer--The loss or gain of electrons will make ions which are attracted to
each other if oppositely charged
Ionic bonds have... ✔Correct Answer--unfilled shells
Are ionic bond weak or strong? ✔Correct Answer--Weak
Covalent bonds ✔Correct Answer--atoms incompletely filled valence electron shells share
electrons between them
Are covalent bonds weak or strong? ✔Correct Answer--Strong
Ionic/covalent bonds are... ✔Correct Answer--chemical bonds
Isotopes ✔Correct Answer--atoms of the same element that have different atomic mass #s due to
different #s of neutrons
Valence electrons ✔Correct Answer--electron(s) in the outermost shell
What are VE responsible for? ✔Correct Answer--chemical properties of the atom
What determines the mass of an element? ✔Correct Answer--Protons and neutrons
Periodic table ✔Correct Answer--arranges all elements according to atomic #s
How many electrons can the first energy level hold? ✔Correct Answer--2, can have 1
How many electrons can the 2nd energy level hold? ✔Correct Answer--8, can have >8
How many electrons can the 3rd energy level hold? ✔Correct Answer--8, can have >8
Orbital rules ✔Correct Answer--electrons occupy certain regions in space according to energy
levels and in pairs
Bohr model ✔Correct Answer--showing all electrons
Lewis dot diagram ✔Correct Answer--showing only valence electrons
Elements with filled VE are... ✔Correct Answer--chemically nonreactive or electronically stable
Atoms without filled valence levels either... ✔Correct Answer--give away or obtain electrons
Electronegativity ✔Correct Answer--attraction of an atom for the valence electrons of another
atom
Elements that are electronegative... ✔Correct Answer--pull the electrons towards them
