Chemistry A Semester Exam 20-21 Questions
And Answers 100% Pass.
Two samples of solids have similar reactivity with acids and similar densities. Their masses and
volumes, however, are not at all similar. Is it possible that these are the same substance? -
answerYes, it is possible because they ...
Chemistry A Semester Exam 20-21 Questions
And Answers 100% Pass.
Two samples of solids have similar reactivity with acids and similar densities. Their masses and
volumes, however, are not at all similar. Is it possible that these are the same substance? -
answer✔Yes, it is possible because they have similar intensive properties.
Melting gold with other metals makes 10-karat gold. Which term best describes 10-karat gold? -
answer✔homogeneous mixture
How do chemists predict the shapes of molecules? - answer✔Due to the repulsion between
electrons, valence electrons will be arranged as far apart from each other as possible.
Lead has an atomic number of 82. Which statement describes all neutral atoms and ions of lead?
- answer✔Neutral atoms of lead must have 82 protons. Ions must have 82 protons, as well.
How did the study of the atom contribute to our understanding of the periodic table of the
elements? - answer✔Experiments that identified characteristics of atoms provided scientists with
atomic weights and atomic numbers, which were used to organize the periodic table.
Hydrogen is in Group 1 of the periodic table. Which kind of bond would form between two
hydrogens? - answer✔A covalent bond would form because the electron would be shared so both
hydrogens have a full, stable shell.
Which of the following elements are most likely to form an ionic bond? - answer✔K and Cl
Which example accurately describes a solution? - answer✔Polar sugar molecules dissolve in
water, which is polar.
How do temperature changes lead to solubility changes for salt dissolved in water? -
answer✔High temperatures mean more kinetic energy, which keeps sodium and chlorine ions
from combining, which increases solubility.
Which statement best describes a weak base? - answer✔It accepts protons and only partially
dissociates in water.
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