Elscores: Tuesday, 20 August 2024
CHEMISTRY CUMULATIVE
EXAM REVIEW PT. 1
Questions and Correct Answer
Many household cleaners, particularly toilet cleaners and some drain cleaners have acid in
them. This is the equation representing hydrochloric acid plus bleach.
NaClO + 2 HCl →Cl2 + H2O + NaCl
If you mix bleach with acidic cleanser, a very noxious gas that can cause respiratory
problems will be released. Your sense of smell can detect this gas in air at concentrations as
low as 0.08 parts per million and at that level, it is basically an irritant. Levels as low as 15
parts per million can cause severe throat irritation while levels of 50 parts per million or
above are very dangerous. What is this gas?
✓ :-- chlorine gas
Most nonmetals form covalent or ionic bonds, depending on the element with which they
react. Carbon predominantly forms covalent bonds since it has 4 valence electrons and can
form single, double or triple bonds with other elements. What element will form an ionic
bond with carbon?
✓ :-- calcium
what is the formula for finding the change of thermal energy in a substance
✓ :-- heat (q) = mass x specific heat x change in temperature
DO NOT COPY AND PASTE!!
CHEMISTRY CUMULATIVE
EXAM REVIEW PT. 1
Questions and Correct Answer
Many household cleaners, particularly toilet cleaners and some drain cleaners have acid in
them. This is the equation representing hydrochloric acid plus bleach.
NaClO + 2 HCl →Cl2 + H2O + NaCl
If you mix bleach with acidic cleanser, a very noxious gas that can cause respiratory
problems will be released. Your sense of smell can detect this gas in air at concentrations as
low as 0.08 parts per million and at that level, it is basically an irritant. Levels as low as 15
parts per million can cause severe throat irritation while levels of 50 parts per million or
above are very dangerous. What is this gas?
✓ :-- chlorine gas
Most nonmetals form covalent or ionic bonds, depending on the element with which they
react. Carbon predominantly forms covalent bonds since it has 4 valence electrons and can
form single, double or triple bonds with other elements. What element will form an ionic
bond with carbon?
✓ :-- calcium
what is the formula for finding the change of thermal energy in a substance
✓ :-- heat (q) = mass x specific heat x change in temperature
DO NOT COPY AND PASTE!!
