Chemistry Final ACS Exam Questions and Answers
Accuracy? - Answer- Closeness of measurements to the TRUE VALUE of what is being
measured
Precision? - Answer- Closeness of a SET of measurements
How do you calculate Percent Error? - Answer- I experimental-accepted I
____________________ x 100 accepted value
Are zeros infront of non-zero digis significant? - Answer- Nope! ex: 0.0071 is only 2 sig figs
Are zeros at the end of a number and to the right of the decimal significant? - Answer- Yep! ex: 9.100 is 4 sig figs
Addition/Subtraction in regards to sig figs? - Answer- Round numbers to the least number of decimal places
Multiplaction/Division in regards to sig figs? - Answer- Round answers to the least amount of sig figs
# of e- equal - Answer- the # of p+
Atomic Mass? - Answer- Number of protons in the nucleus (number on the left bottom corner of the chemical symbol)
Atomic Mass Number? - Answer- Number of protons and neutrons (number on the left upper corner of the chemical symbol)
Isotope? - Answer- Atoms of the same element, but with different masses (different number of neutrons)
STUDY ELECTRON CONFIGURATIONS - Answer- STUDY ELECTRON CONFIGURATIONS
Do columns or rows in the Periodic Table have similar patterns? - Answer- Columns (the "groups") have repeating patterns? Which area of the Periodic Table has greater metallicness? - Answer- Left and down has greater metallicness
Which area of the PT has greater atomic size? - Answer- Left and down has a greater atomic size
Which area of the PT has greater ionization energy? - Answer- Right side and up has greater ionization energy
Which area of the PT has greater electronegativity? - Answer- Right side and up has greater electronegativiy, except the Noble Gases of 0 electronegativy
Ionic Bonding? - Answer- Metal and a nonmetal. Give/take electrons
Covalent bonding? - Answer- Nonmetal and a nonmetal. Share electrons.
VSEPR Theory? - Answer- Valence Shell Electron Pair Repulsion
aka Valence e- pairs stay as far apart as possible
How do you determine polarity? - Answer- Use the chart that has electronegativity values, then subtract the elements in the compound from each other.
Is water polar? - Answer- Yes!
Combination Reaction? - Answer- A + B --> AB
Decomposition Reaction? - Answer- AB --> A + B
Single Replacement Reaction? - Answer- AB + C --> AC + B
Double Replacement Reaction? - Answer- AB + CD --> AD + CB
Combustion Reaction? - Answer- C + H + O --> H2O + CO2 always
Avogadro's Number? - Answer- 6.022 x 10^23 particles = 1 mole
Molar Mass? - Answer- gram/mole
Mole to Volume? - Answer- 1 mole = 22.4 L
Empirical Formula vs Molecular Formula? - Answer- Molecular = the actual number of atoms in a compound
Empirical = basic ratio, smallest whole numbers of atoms in a compound
Percent Composition? - Answer- Mass element/mass compound x 100
Accuracy? - Answer- Closeness of measurements to the TRUE VALUE of what is being
measured
Precision? - Answer- Closeness of a SET of measurements
How do you calculate Percent Error? - Answer- I experimental-accepted I
____________________ x 100 accepted value
Are zeros infront of non-zero digis significant? - Answer- Nope! ex: 0.0071 is only 2 sig figs
Are zeros at the end of a number and to the right of the decimal significant? - Answer- Yep! ex: 9.100 is 4 sig figs
Addition/Subtraction in regards to sig figs? - Answer- Round numbers to the least number of decimal places
Multiplaction/Division in regards to sig figs? - Answer- Round answers to the least amount of sig figs
# of e- equal - Answer- the # of p+
Atomic Mass? - Answer- Number of protons in the nucleus (number on the left bottom corner of the chemical symbol)
Atomic Mass Number? - Answer- Number of protons and neutrons (number on the left upper corner of the chemical symbol)
Isotope? - Answer- Atoms of the same element, but with different masses (different number of neutrons)
STUDY ELECTRON CONFIGURATIONS - Answer- STUDY ELECTRON CONFIGURATIONS
Do columns or rows in the Periodic Table have similar patterns? - Answer- Columns (the "groups") have repeating patterns? Which area of the Periodic Table has greater metallicness? - Answer- Left and down has greater metallicness
Which area of the PT has greater atomic size? - Answer- Left and down has a greater atomic size
Which area of the PT has greater ionization energy? - Answer- Right side and up has greater ionization energy
Which area of the PT has greater electronegativity? - Answer- Right side and up has greater electronegativiy, except the Noble Gases of 0 electronegativy
Ionic Bonding? - Answer- Metal and a nonmetal. Give/take electrons
Covalent bonding? - Answer- Nonmetal and a nonmetal. Share electrons.
VSEPR Theory? - Answer- Valence Shell Electron Pair Repulsion
aka Valence e- pairs stay as far apart as possible
How do you determine polarity? - Answer- Use the chart that has electronegativity values, then subtract the elements in the compound from each other.
Is water polar? - Answer- Yes!
Combination Reaction? - Answer- A + B --> AB
Decomposition Reaction? - Answer- AB --> A + B
Single Replacement Reaction? - Answer- AB + C --> AC + B
Double Replacement Reaction? - Answer- AB + CD --> AD + CB
Combustion Reaction? - Answer- C + H + O --> H2O + CO2 always
Avogadro's Number? - Answer- 6.022 x 10^23 particles = 1 mole
Molar Mass? - Answer- gram/mole
Mole to Volume? - Answer- 1 mole = 22.4 L
Empirical Formula vs Molecular Formula? - Answer- Molecular = the actual number of atoms in a compound
Empirical = basic ratio, smallest whole numbers of atoms in a compound
Percent Composition? - Answer- Mass element/mass compound x 100
