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CEM 141 Exam #1 Questions And Answers
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What is a scientific question? i.e. what can it be answered by? - ANS scientific questions can be answered by: -doing experiments -making observations -taking measurements *must be able to be repeated ex) what temp. will my coffee be if I add milk to it? What 3 parts do you ne...

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  • 16 de noviembre de 2024
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CEM 141 Exam #1 Questions And
Answer


What is a scientific question? i.e. what can it be answered by? - ANS scientific questions
can be answered by:
-doing experiments
-making observations
-taking measurements

*must be able to be repeated
ex) what temp. will my coffee be if I add milk to it?

What 3 parts do you need for a scientific explanation? Further explain what they mean. - ANS
1. Claim: the target of your explanation
2. Evidence: the data or scientific principle you are using to support your claim; comes from your
experiment
3. Reasoning: the connection between your claim and evidence

* all this information develops an explanation or theory

What is a scientific model and what does it help do? - ANS A scientific model...
-can be a drawing, graph, diagram, or equation
-help make sense by explaining how something happens and making testable, quantifiable
predictions

What is a scientific theory? - ANS -best explanation of existing evidence and data
-explains how/why
-makes testable predictions
-can be proven false
-can change over time

What is the difference between a law and a theory? - ANS -a law describes a phenomenon
(answers what?)
-a theory explains the phenomenon (answers why?)

Special relativity (time and space are not absolute but relative to each other) is an example of
a....? - ANS theory

, The force of attraction between masses is proportional to the product of the masses...is an
example of a...? - ANS law

An atom of hydrogen has one proton is an example of a...? - ANS fact

If we add reagent X to a reaction it will go faster if an example of a ....? - ANS hypothesis

What will happen if we add X to the reaction? is an example of a...? - ANS question

What did Feynman write about atoms? - ANS "all things are made of atoms-little particles
that move around in perpetual motion, attracting each other when they are a little distance apart,
but repelling on being squeezed into one another."

Which has atoms in it? Heat, Cells, Air, Gold - ANS Cells, air, and gold

Which is biggest? An atom, a molecule, a cell, it depends - ANS a cell/ it depends

How big is an atom (H)? - ANS about 0.1 nanometer (0.1x10^-9m)

*0.1 mm is smallest unit seen by human eye

What two methods provide images at the atomic level? - ANS -Atomic force microscopy
(AFM)
-Scanning tunneling microscopy (STM)

Where did the original idea of atoms come from? What are some characteristics of their beliefs?
- ANS -the Greeks: "Atomos": not to be cut

-based on philosophy; not evidence

-elements; earth, fire, air, and water

-atoms were in constant motion-based on watching the movement of specks of dust in
sunlight--> Brownian motion

-believed shape of atoms played a role in properties-->foreshadowed molecular structure
determining properties

What properties ascribed by the Greeks to atoms do we still consider to be valid? If atoms are in
constant motion, what do you think keeps them moving? - ANS thermal energy; heat keeps
them in motion

What distinguishes one element from another? How do the atoms of different elements differ? -
ANS number of protons in the nucleus (atomic number)

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