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Questions in chemistry
📝 Answered - Define and compare boiling point, melting point, and freezing point.
📝 Answered - You heat a piece of iron from 200 K to 400 K. What happens to the energy of random motion of the atoms?
📝 Answered - A 30.00 mL solution of 0.100 M benzoic acid, a monoprotic acid, is titrated with 0.100 M NaOH. The [tex]$K_a$[/tex] is [tex]$6.3 \times 10^{-5}$[/tex]. Determine the pH of the solution after the following volumes of NaOH are added: a. 0 mL b. 10.00 mL c. 30.00 mL d. 40.00 mL
📝 Answered - A 4 kg rock is rolling at 10 m/s. Find its kinetic energy.
📝 Answered - Describe the primordial soup theory.
📝 Answered - Within a period, an increase in atomic number is usually accompanied by A. a decrease in atomic radius and an increase in electronegativity. B. an increase in atomic radius and an increase in electronegativity. C. a decrease in atomic radius and a decrease in electronegativity. D. an increase in atomic radius and a decrease in electronegativity. E. None of these answer choices is correct.
📝 Answered - Determine the number of electrons in the outer ring (valence electrons) for each of the following elements: - Phosphorus - Potassium - Oxygen - Iodine - Gold - Bromine - Sulfur - Cobalt
📝 Answered - The change in heat energy for a reaction is best expressed as a change in: A. Enthalpy (H) B. Absolute temperature (T) C. Specific heat (c) D. Entropy (S) E. Kinetic energy (KE)
📝 Answered - Bicarbonate ion is an example of a: a. an acid b. a base c. an acidic salt d. a basic salt e. an amphoteric substance
📝 Answered - These two compounds are in the liquid phase at 293 K. A. Br₂ and Hg B. Cl₂ and F₂ C. NH₄⁺ and H₃O⁺ D. Fe and Co E. Diamond and graphite
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