CEM 141 EXAM 1 2026 GENERAL CHEMISTRY
REVISION QUESTIONS SOLUTIONS COMPLETE
SET
◉ scientific questions
Answer: questions that can be answered by doing experiments,
making observations, taking measurements. Experiments must be
replicable.
◉ what do you need if you're going to make a claim?
Answer: evidence
◉ a scientific model
Answer: can be a drawing or a graph or a diagram or an equation.
We use models to help us make sense by predicting what will
happen and explaining how something happens.
◉ constructing a scientific explanation
Answer: -Claim
-Evidence
-Reasoning
,◉ claim
Answer: the target of your explanation
◉ evidence
Answer: the data or scientific principle you are using to support
your claim
◉ reasoning
Answer: the connection between your claim and evidence
◉ scientific theory has to be...
Answer: based on evidence
◉ a scientific theory
Answer: the best available explanation of the
evidence/data/observations
◉ a scientific theory must be
Answer: testable and falsifiable
◉ What's the difference between a law and a theory
Answer: a law describes the phenomenon by telling you what
,a theory explains the phenomenon by telling you why
◉ A law
Answer: tells you what
◉ A theory
Answer: tells you why
◉ Quote about atoms
Answer: "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" -Richard Feynman
◉ Which has atoms in it?
A. heat
B. cells
C. air
D. gold
Answer: Cells, Air, and Gold
◉ Which is biggest?
, -an atom
-a molecule
-a cell
-it depends
Answer: it depends because the question is vague... some molecules
are smaller than atoms etc
◉ How big do you thing an atom of H is?
- 0.1cm (0.1x10^-2m)
-0.1mm (0.1x10^-3m)
-0.1micrometer (0.1x10^-6m)
-0.1nanometer (0.1x10^-9m)
-0.1 picometer (0.1x10^-12m)
Answer: 0.1 nm
◉ What is the evidence that atoms exist?
Answer: we can now see and manipulate atoms
◉ The original idea of atoms comes from
Answer: The Greeks
◉ Was the Greeks idea of atoms a scientific theory?
REVISION QUESTIONS SOLUTIONS COMPLETE
SET
◉ scientific questions
Answer: questions that can be answered by doing experiments,
making observations, taking measurements. Experiments must be
replicable.
◉ what do you need if you're going to make a claim?
Answer: evidence
◉ a scientific model
Answer: can be a drawing or a graph or a diagram or an equation.
We use models to help us make sense by predicting what will
happen and explaining how something happens.
◉ constructing a scientific explanation
Answer: -Claim
-Evidence
-Reasoning
,◉ claim
Answer: the target of your explanation
◉ evidence
Answer: the data or scientific principle you are using to support
your claim
◉ reasoning
Answer: the connection between your claim and evidence
◉ scientific theory has to be...
Answer: based on evidence
◉ a scientific theory
Answer: the best available explanation of the
evidence/data/observations
◉ a scientific theory must be
Answer: testable and falsifiable
◉ What's the difference between a law and a theory
Answer: a law describes the phenomenon by telling you what
,a theory explains the phenomenon by telling you why
◉ A law
Answer: tells you what
◉ A theory
Answer: tells you why
◉ Quote about atoms
Answer: "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" -Richard Feynman
◉ Which has atoms in it?
A. heat
B. cells
C. air
D. gold
Answer: Cells, Air, and Gold
◉ Which is biggest?
, -an atom
-a molecule
-a cell
-it depends
Answer: it depends because the question is vague... some molecules
are smaller than atoms etc
◉ How big do you thing an atom of H is?
- 0.1cm (0.1x10^-2m)
-0.1mm (0.1x10^-3m)
-0.1micrometer (0.1x10^-6m)
-0.1nanometer (0.1x10^-9m)
-0.1 picometer (0.1x10^-12m)
Answer: 0.1 nm
◉ What is the evidence that atoms exist?
Answer: we can now see and manipulate atoms
◉ The original idea of atoms comes from
Answer: The Greeks
◉ Was the Greeks idea of atoms a scientific theory?
