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CEM EXAM 1 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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CEM EXAM 1 QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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CEM EXAM 1 QUESTIONS ANDANSWERS WITH SOLUTIONS 2024
Scientific question - ANSWER no such thing as "the scientific method"
can be answered by doing experiments,making observations,taking measurements in a replicable way
What do scientists do? - ANSWER 1. ask questions
2.design experiments
3.gather and analyze data
4. make claims (based on data and evidence)
5. Develop expectations, models and theories about how the universe behaves how it does
CLAIM, EVIDENCE,RESONOING - ANSWER you need evidence if you are going to make a claim and you
need to support that with data
1. CLAIM- the target of your explanation
2.EVIDENCE - scientific principal you are using to support your claim
3.REASONING- that connects your claim to evidence
ex. claim if i add milk to hot coffee the temp will decrease
scientific model - ANSWER can be a drawing or a graph or a diagram or equation physical or mental
used to help make sense or predict what will happen
they make testable,quantifiable predictions
and this can help us explain WHY
a scientific theory - ANSWER based on observations/ experiments
makes testable productions
may change over time as new evidence becomes available
is falsifiable
restricted to natural phenomenon
, law vs theory - ANSWER law is the description of phenomenon while theory explains the phenomenon
Atomic theory development - ANSWER original idea of atoms came from greeks but was not a scientific
theory b/c no evidence
they called atoms "atoms" which means not to be cut
based on philosophy
they thought the elements were: earth, air, fire, h2o
thought to be in constant motion b/c dust particles and sunlight and that there was a void (brownian
motion)
h2o smooth spears and iron gadgety
atom - ANSWER is the smallest unit of an element
91 naturally occurring ordered on PT
periodic table - ANSWER atoms differ on the PT by the atomic number or number of protons
Daltons atomic theory - ANSWER -elements are composed of small indivisible indestructible particles
called atoms
this is FALUSE bc of subatomic particles
-all elements are identical and have same mass and properties
FALUSE b/c of isotopes
-atoms of a given element are dif from atoms in other elements
TRUE
-compounds are formed by combinations of atoms of 2 or more elements
true
-chemical reactions are due to the rearrangements of atoms matter are neither created or destroyed
TRUE
lived in manchester
Which subatomic particle was discovered first - ANSWER electron it was discovered by JJ Thomson
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