Chem 280 midterm exam questions with
correct answers
Define |Chemistry: |- |CORRECT |ANSWER✔✔-Science |that |tries |to |understand |how |matter |
behaves |by |studying |how |atoms |/ |molecules |behave
Scientific |Method |/ |steps |- |CORRECT |ANSWER✔✔-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
Observations |- |CORRECT |ANSWER✔✔-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
Hypothesis |- |CORRECT |ANSWER✔✔-tentative |interpretation |or |explanation |of |observation
-good |hypothesis |is |falsifiable |-> |further |testing |has |potential |to |prove |it |wrong
Experiment |- |CORRECT |ANSWER✔✔-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
, Scientific |Law |- |CORRECT |ANSWER✔✔-Brief |statement |that |summarizes |past |observations |and
|predicts |future |ones
The |Law |of |Conservation |of |Mass. |- |CORRECT |ANSWER✔✔-All |matter |in |chemical |reaction |is |
neither |created |nor |destroyed
Theory |- |CORRECT |ANSWER✔✔-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
What |is |the |correct |multiplier |for |the |prefix |centi? |- |CORRECT |ANSWER✔✔-10-2
What |is |the |correct |scientific |notation |and |total |number |of |sig |figs |for |0.00032400? |- |CORRECT
|ANSWER✔✔-3.2x10-4
The |correct |number |of |sig |figs |in |the |number |6.0220 |is? |- |CORRECT |ANSWER✔✔-5
Determine |the |answer |to |the |following |mixed |operations |problem: |(9.658 |x |0.54) |+ |88.6 |= |- |
CORRECT |ANSWER✔✔-93.8
Determine |the |answer |to |the |following |mixed |operations |problem: |(5.321 |x |0.15) |+ |26.1 |= |- |
CORRECT |ANSWER✔✔-26.9
Determine |the |answer |to |the |following |mixed |operations |problem: |(7.5 |x |102 |- |2.53 |x |102) |÷ |
8.87 |= |- |CORRECT |ANSWER✔✔-56
correct answers
Define |Chemistry: |- |CORRECT |ANSWER✔✔-Science |that |tries |to |understand |how |matter |
behaves |by |studying |how |atoms |/ |molecules |behave
Scientific |Method |/ |steps |- |CORRECT |ANSWER✔✔-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
Observations |- |CORRECT |ANSWER✔✔-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
Hypothesis |- |CORRECT |ANSWER✔✔-tentative |interpretation |or |explanation |of |observation
-good |hypothesis |is |falsifiable |-> |further |testing |has |potential |to |prove |it |wrong
Experiment |- |CORRECT |ANSWER✔✔-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
, Scientific |Law |- |CORRECT |ANSWER✔✔-Brief |statement |that |summarizes |past |observations |and
|predicts |future |ones
The |Law |of |Conservation |of |Mass. |- |CORRECT |ANSWER✔✔-All |matter |in |chemical |reaction |is |
neither |created |nor |destroyed
Theory |- |CORRECT |ANSWER✔✔-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
What |is |the |correct |multiplier |for |the |prefix |centi? |- |CORRECT |ANSWER✔✔-10-2
What |is |the |correct |scientific |notation |and |total |number |of |sig |figs |for |0.00032400? |- |CORRECT
|ANSWER✔✔-3.2x10-4
The |correct |number |of |sig |figs |in |the |number |6.0220 |is? |- |CORRECT |ANSWER✔✔-5
Determine |the |answer |to |the |following |mixed |operations |problem: |(9.658 |x |0.54) |+ |88.6 |= |- |
CORRECT |ANSWER✔✔-93.8
Determine |the |answer |to |the |following |mixed |operations |problem: |(5.321 |x |0.15) |+ |26.1 |= |- |
CORRECT |ANSWER✔✔-26.9
Determine |the |answer |to |the |following |mixed |operations |problem: |(7.5 |x |102 |- |2.53 |x |102) |÷ |
8.87 |= |- |CORRECT |ANSWER✔✔-56
