BIO 181 UNIT 1 EXAM TEST QUESTIONS WITH ACCURATE SOLUTIONS (GRADED A+)
Hypothesis
a possible explanation for an observation
A hypothesis..
-must be tested to determine its validity
-is often tested in many different ways
-allows for predictions to be made
Experiment
tests the hypothesis
An experiment...
-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...
you should be able to predict the results of the experiment
,Scientific inquiry
Observation
Question
Hypothesis
Experiments
Conclusion
Theory/Law
Matter
anything that occupies space and has mass
What is matter composed of?
atoms that are composed of protons, neutrons and electrons
Where are protons found?
Nucleus
Where are neutrons found?
Nucleus
Where are electrons found?
,In orbitals around the nucleus
Chemical element
substance that cannot be broken down to other substances by ordinary chemical means
How many elements are there?
92
How many elements are important to life?
25
What elements make up 96% of air on Earth?
Caron, Hydrogen, Oxygen and Nitrogen
Compound
any pure substance which contains atoms of 2 or more different elements
Ex of compound
Sodium chloride
, Compounds are held together by...
Ionic or covalent bonds
Ionic bonds
The loss or gain of electrons will make ions which are attracted to each other if oppositely
charged
Elements that are electronegative...
pull the electrons towards them
What are the most electronegative elements?
F, O, N, Cl, P, S
Ion
atoms with a charge + or -
Cation
ion with + charge
Anion
Hypothesis
a possible explanation for an observation
A hypothesis..
-must be tested to determine its validity
-is often tested in many different ways
-allows for predictions to be made
Experiment
tests the hypothesis
An experiment...
-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...
you should be able to predict the results of the experiment
,Scientific inquiry
Observation
Question
Hypothesis
Experiments
Conclusion
Theory/Law
Matter
anything that occupies space and has mass
What is matter composed of?
atoms that are composed of protons, neutrons and electrons
Where are protons found?
Nucleus
Where are neutrons found?
Nucleus
Where are electrons found?
,In orbitals around the nucleus
Chemical element
substance that cannot be broken down to other substances by ordinary chemical means
How many elements are there?
92
How many elements are important to life?
25
What elements make up 96% of air on Earth?
Caron, Hydrogen, Oxygen and Nitrogen
Compound
any pure substance which contains atoms of 2 or more different elements
Ex of compound
Sodium chloride
, Compounds are held together by...
Ionic or covalent bonds
Ionic bonds
The loss or gain of electrons will make ions which are attracted to each other if oppositely
charged
Elements that are electronegative...
pull the electrons towards them
What are the most electronegative elements?
F, O, N, Cl, P, S
Ion
atoms with a charge + or -
Cation
ion with + charge
Anion
