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NY Regents Chemistry Chemistry — practice by topic

Browse 69 questions across 3 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Chemistry topics

Electrochemistry (44)Chemical Bonding and Molecular Geometry (25)Electrochemical Series (17)

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A neutral atom loses two electrons from its valence shell. What has it become?Read the answer and worked solution →What force holds the ions of a salt crystal together?Read the answer and worked solution →How much energy is needed to pull one mole of solid sodium chloride apart into gaseous ions?Read the answer and worked solution →A calcium atom loses both of its valence electrons. Its 18 remaining electrons match which noble gas?Read the answer and worked solution →

Worked practice questions

A neutral atom loses two electrons from its valence shell. What has it become?

  1. A cation carrying a 2+ charge
  2. An anion carrying a 2- charge
  3. An isotope with added mass
  4. A radical with a lone electron
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Correct answer: A. A cation carrying a 2+ charge

1. Losing electrons leaves the particle with more protons than electrons, so it ends up positive. 2. A positive ion is a cation, and every electron lost adds one unit of positive charge. 3. Two electrons lost therefore leave a cation with a 2+ charge. 4. Gaining electrons would instead make an anion, so the negative option does not fit. _Source: OpenStax Chemistry (CC BY 4.0), Chs 7 and 17, section 7.1 Ionic Bonding_

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What force holds the ions of a salt crystal together?

  1. Equal sharing of one pair of electrons
  2. Overlap of two half filled orbitals
  3. Electrostatic attraction between opposite charges
  4. Weak attraction between neutral molecules
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Correct answer: C. Electrostatic attraction between opposite charges

1. A salt is built from cations, which are positive, and anions, which are negative. 2. Opposite charges pull on each other, and that pull is an electrostatic force. 3. This electrostatic attraction between cations and anions is the ionic bond itself. 4. Sharing electrons would make a covalent bond instead, which is a different mechanism. _Source: OpenStax Chemistry (CC BY 4.0), Chs 7 and 17, section 7.1 Ionic Bonding_

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How much energy is needed to pull one mole of solid sodium chloride apart into gaseous ions?

  1. 436 kJ
  2. 769 kJ
  3. 243 kJ
  4. 185 kJ
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Correct answer: B. 769 kJ

1. Separating the lattice means overcoming every attraction between the ions at once. 2. For one mole of solid sodium chloride that costs 769 kilojoules. 3. The other values belong to covalent bonds, which are far weaker than a whole ionic lattice. _Source: OpenStax Chemistry (CC BY 4.0), Chs 7 and 17, section 7.1 Ionic Bonding_

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