Chemistry Regents

How many electrons are shared in a triple bond between two atoms?

• 6

• 2

• 3

• 4

Which phrase describes the effect of adding a catalyst to a chemical reaction in order to increase the reaction rate?

• provides a different reaction pathway with a lower activation energy

• provides a different reaction pathway with a higher activation energy

• uses the same reaction pathway with a higher activation energy

• uses the same reaction pathway with a lower activation energy

Which statement describes the two types of reactions that occur in operating electrochemical cells?

• Nonspontaneous reactions occur in voltaic cells, and spontaneous reactions occur in electrolytic cells.

• Nonspontaneous reactions occur in electrolytic cells, and nonspontaneous reactions occur in voltaic cells.

• Spontaneous reactions occur in voltaic cells, and nonspontaneous reactions occur in electrolytic cells.

• Spontaneous reactions occur in electrolytic cells, and spontaneous reactions occur in voltaic cells.

Which term describes an acid according to one acid-base theory?

• H⁺ acceptor

• H⁺ donor

• H₂ acceptor

• H₂ donor

Which chemical bond is most polar?

• a O–H bond in H₂O

• a S–H bond in H₂S

• a Se–H bond in H₂Se

• a Te–H bond in H₂Te

Tags

NGSS.HS-PS1-1

This apparatus is used for which process?

• filtration

• distillation

• chromatography

• electrolysis

Which subatomic particles are matched with their charges?

• Protons are positive and neutrons are negative.

• Protons are positive and electrons are negative

• Protons are negative and neutrons have no charge.

• Protons are negative and electrons have no charge.

Which conclusion directly resulted from the “gold foil experiment”?

• Atoms are mostly empty space.

• Atoms are hard, indivisible spheres.

• Electrons are located in shells.

• Electrons have a small mass.

The bright-line spectrum of an element is produced when excited-state electrons

• absorb energy and move to higher energy states

• absorb energy and move to lower energy states

• release energy and move to higher energy states

• release energy and move to lower energy states

Tags

NGSS.HS-PS4-3

Atoms of which element in Group 15 have the greatest electronegativity?

• As

• Bi

• N

• P

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2