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CEM 141 CLICKER QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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CEM 141 CLICKER QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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CEM 141 CLICKER QUESTIONS ANDANSWERS WITH SOLUTIONS 2024
Is "What temperature will my coffee be if I add milk to it?" a scientific question? - ANSWER Yes (testable
and repeatable)
Is "Do Angels have wings?" a scientific question? - ANSWER No (not testable and not repeatable)
Is "Can my dog understand what I say?" a scientific question? - ANSWER Not enough information
"An atom of hydrogen has one Proton" is an example of... - ANSWER Fact
"The force of attraction between masses is proportional to the product of the masses, and inversely
proportional to the square of the distance between them" is an example of... - ANSWER Law
"If we add reagent X to a reaction it will go faster" is an example of... - ANSWER Hypothesis
"Special relativity (time and space are not absolute but are relative to each other)" is an example of... -
ANSWER Theory
"What will happen if we add X to the reaction?" - ANSWER Question
Which of the following has atoms in it?
-Heat
-Cells
-Air
-Gold - ANSWER Cells Air and Gold
Which is biggest?
-An Atom
, -A molecule
-A cell
-It depends - ANSWER It depends
How big is an atom (H)? - ANSWER 0.1 nanometer (0.1 x 10^-9)
What properties ascribed by the Greeks to atoms do we still consider to be valid? - ANSWER Atoms are
in constant motion
If atoms are in constant motion, what do you think keeps them moving? - ANSWER Energy
What distinguishes one element from another? How do the atoms of different elements differ? -
ANSWER Number of Protons
What types of evidence might be used to conclude that you had isolated a new element? - ANSWER
Unique number of protons, have different structures, different atomic masses, DIFFERENT PROPERTIES
What types of elements would be difficult to identify? - ANSWER Noble gases (Don't react with most
things and are gases)
What is the difference between an atoms and a molecule - ANSWER Molecule is a collection of atoms
What is the difference between an element and a compound? - ANSWER Element is made up of one kind
of atom and a compound is made of many elements
Does "Elements are composed of small indivisible indestructible particles called atoms" from Dalton's
Theory still hold today? - ANSWER No (protons, neutrons, elections are smaller, and atoms are divisible)
Does "All atoms of an element are identical and have the same mass and properties" from Dalton's
Theory still hold today? - ANSWER No (Isotopes have same number of protons but a different number of
neutrons)
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