Chemical reactions can be classified based on patterns such as reversibility or irreversibility, changes in chemical structure, and changes in chemical energy. These changes can refer to the reaction direction, molecular rearrangements, and energy transformations.
The criteria for classifying chemical reactions are notable patterns of behavior and include factors such as reversibility or irreversibility, changes in chemical structure, and changes in chemical energy. For instance, reversibility or irreversibility refers to the direction in which the reaction takes place. A reaction may synthesize into a product and then decompose back into the reactants, an instance of reversible reaction.
Changes in chemical structure involve a transformation in the arrangements of atoms in the reactants and the products. For instance, in a chemical reaction involving the transfer of hydrogen ions between reactants, the structure of the molecules changes.
Changes in chemical energy denote transformations involving energy, either by absorption or release, accompanying the reaction process. This is a characteristic feature of exergonic and endergonic reactions. For instance, in an exergonic reaction, energy is released due to the reaction.
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(1) At STP, carbon has a greater density than
fluorine.
(2) A carbon atom has more valence electrons
than a fluorine atom.
(3) The difference in electronegativity between
carbon and oxygen is greater than that
between fluorine and oxygen.
(4) The difference in first ionization energy
between carbon and oxygen is greater than
that between fluorine and oxygen.
Answer: (3) The difference in electronegativity between carbon and oxygen is greater than that between fluorine and oxygen.
Explanation: Polarity of a molecule is due to the difference in electronegativity of the atoms. More is the electronegativity difference, more is the polarity.
Electronegativity of carbon = 2.5
Electronegativity of oxygen = 3.5
Electronegativity of fluorine = 4.0
Thus the difference in electronegativity of carbon and oxygen is=(3.5-2.5)= 1.0
Thus the difference in electronegativity of fluorine and oxygen is=(4.0-3.5)= 0.5.
Thus C-O bond is more polar than F-O bond.
B. a Joule.
C. its heat capacity.
D. a Btu.
Answer:
2.34 %
Explanation:
Since the density of the Jello, ρ = 1.14 g/mL and ρ = m/v where m = mass of jello and v = volume of jello = 475 mL.
So, m = ρv
substituting the values of the variables into the equation, we have
m = ρv
m = 1.14 g/mL × 475 mL = 541.5 g
Since we have 13 g of sugar in the jello, the total mass present is 13 g + 541.5 g = 554.5 g
So, the percentage by mass of sugar present % m/m = mass of sugar present/total mass × 100 %
= 13 g/554.5 g × 100 %
= 0.0234 × 100 %
= 2.34 %
So, the percentage by mass of sugar present % m/m = 2.34 %
The reaction of sodium with bromide is sodium bromide. The balanced chemical equation is Na + Br → NaBr. In the reaction, only one mole of sodium is needed to react with one mole of bromine to produce one mole of sodium bromide.
Answer:
A 1:1
Explanation: