Chem 280 midterm questions with 100%
complete solutions passed
Science that tries to understand how matter behaves by studying how atoms / molecules
behave - correct answer ✔✔Define Chemistry:
A way of learning that emphasizes observation/experimentation to understand the world.
1. observation
2. form hypothesis
3. test hypothesis by experiment
4. form law/theory - correct answer ✔✔Scientific Method / steps
measurement of some aspect of nature
- some simple w/ naked eye, others rely on sensitive instrumentation
- occasionally observation happens by chance
- usually involves measurement/description of some aspect of physical world - correct answer
✔✔Observations
tentative interpretation or explanation of observation
-good hypothesis is falsifiable -> further testing has potential to prove it wrong - correct answer
✔✔Hypothesis
highly controlled observations designed to validate or invalidate hypothesis
- these results may confirm or show hypothesis to be wrong
- hypothesis may have to be modified or discarded/replaced
- leads to scientific law - correct answer ✔✔Experiment
, Brief statement that summarizes past observations and predicts future ones - correct answer
✔✔Scientific Law
All matter in chemical reaction is neither created nor destroyed - correct answer ✔✔The Law of
Conservation of Mass.
one or more well-established hypothesis may for basis for scientific theory
- theories provide broader/deeper explanation for observations + laws.
- they model nature + predict behavior that extends well beyond observations/laws on which
they are founded
- atomic theory: all matter composed of small, indestructible particles = atoms - correct answer
✔✔Theory
10-2 - correct answer ✔✔What is the correct multiplier for the prefix centi?
3.2x10-4 - correct answer ✔✔What is the correct scientific notation and total number of sig figs
for 0.00032400?
5 - correct answer ✔✔The correct number of sig figs in the number 6.0220 is?
93 - correct answer ✔✔Determine the answer to the following mixed operations problem:
(9.658 x 0.54) + 88.6 =
26 - correct answer ✔✔Determine the answer to the following mixed operations problem:
(5.321 x 0.15) + 26.1 =
56 - correct answer ✔✔Determine the answer to the following mixed operations problem: (7.5
x 102 - 2.53 x 102) ÷ 8.87 =
complete solutions passed
Science that tries to understand how matter behaves by studying how atoms / molecules
behave - correct answer ✔✔Define Chemistry:
A way of learning that emphasizes observation/experimentation to understand the world.
1. observation
2. form hypothesis
3. test hypothesis by experiment
4. form law/theory - correct answer ✔✔Scientific Method / steps
measurement of some aspect of nature
- some simple w/ naked eye, others rely on sensitive instrumentation
- occasionally observation happens by chance
- usually involves measurement/description of some aspect of physical world - correct answer
✔✔Observations
tentative interpretation or explanation of observation
-good hypothesis is falsifiable -> further testing has potential to prove it wrong - correct answer
✔✔Hypothesis
highly controlled observations designed to validate or invalidate hypothesis
- these results may confirm or show hypothesis to be wrong
- hypothesis may have to be modified or discarded/replaced
- leads to scientific law - correct answer ✔✔Experiment
, Brief statement that summarizes past observations and predicts future ones - correct answer
✔✔Scientific Law
All matter in chemical reaction is neither created nor destroyed - correct answer ✔✔The Law of
Conservation of Mass.
one or more well-established hypothesis may for basis for scientific theory
- theories provide broader/deeper explanation for observations + laws.
- they model nature + predict behavior that extends well beyond observations/laws on which
they are founded
- atomic theory: all matter composed of small, indestructible particles = atoms - correct answer
✔✔Theory
10-2 - correct answer ✔✔What is the correct multiplier for the prefix centi?
3.2x10-4 - correct answer ✔✔What is the correct scientific notation and total number of sig figs
for 0.00032400?
5 - correct answer ✔✔The correct number of sig figs in the number 6.0220 is?
93 - correct answer ✔✔Determine the answer to the following mixed operations problem:
(9.658 x 0.54) + 88.6 =
26 - correct answer ✔✔Determine the answer to the following mixed operations problem:
(5.321 x 0.15) + 26.1 =
56 - correct answer ✔✔Determine the answer to the following mixed operations problem: (7.5
x 102 - 2.53 x 102) ÷ 8.87 =
