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As plants grow, light energy is converted into chemical energy during the process of photosynthesis. The reaction produces glucose and oxygen. The balanced equation below represents photosynthesis.

NY Regents Chemistry June 2023 Questions 74-78


As plants grow, light energy is converted into chemical energy during the process of photosynthesis. The reaction produces glucose and oxygen. The balanced equation below represents photosynthesis.

6CO2 + 6H2O + light energy → C6H12O6 + 6O2

74  State the molecular polarity for each of the reactants in the equation.

Solution: Mayya's Trick

A Molecule is NONPOLAR if

It consists of two of the same atoms. Example: H2, O2, N2

OR

The central atom is attached to the same atoms AND has no lone pairs of electrons.

CO2 is a nonpolar molecule and H2O is a polar molecule.


75  In the space in your answer booklet, draw a Lewis electron-dot diagram for a molecule of water.

Solution:


76  Based on Table S, compare the strength of attraction of a carbon atom for electrons with the strength of attraction of an oxygen atom for the electrons in a bond between them.

Solution: Table S on the Reference Table lists electronegativity for all the elements. Carbon has an electronegativity value of 2.6, which is lower than oxygen’s electronegativity value of 3.4.


77  State, in terms of element classification, why CO2 is a molecular compound.

Solution: A molecular compound consists of all nonmetals. Both carbon and oxygen are nonmetals.


78  Write the empirical formula for glucose.

Solution: Empirical formula is a formula with the smallest whole number ratio of atoms. We just need to divide subscripts further.C6H12O6 where we can divide all the subscripts by 6, we get C1H2O1= CH2O


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