Mostly Electrochemistry & Redox

. What is conserved during a chemical reaction?

• mass, only

• neither mass nor charge

• both mass and charge

• charge, only

Tags

NGSS.HS-PS1-7

Which reaction occurs at the anode in an electrochemical cell?

• saponification

• oxidation

• esterification

• reduction

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.

A collision between reactant particles is most likely to result in a reaction when the particles have proper orientation and proper

• charge

• energy

• mass

• radius

Tags

NGSS.HS-PS1-5

Which statement accurately describes particles of an ideal gas, according to the kinetic molecular theory?

• The distance between the gas particles is much greater than the size of the particles

• As the gas particles collide, the total energy of the system increases

• The gas particles have strong intermolecular forces

• The gas particles move in a circular motion

As the elements in Group 2 in the periodic table are considered in order of increasing atomic number, there is a general increase in

• stability

• atomic radius

• electronegativity

• first ionization energy

Tags

NGSS.HS-PS1-1

During the operation of a voltaic cell, the cell produces

• electrical energy spontaneously

• chemical energy spontaneously

• electrical energy nonspontaneously

• chemical energy nonspontaneously

Which statement explains why Group 18 elements are stable and unreactive?

• They are all gases

• They have low melting points.

• Their valence electron shell has reached a full octet.

• They have high ionization energies

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which statement describes the general trends in electronegativity and atomic radius as the elements in Period 2 are considered in order from left to right? 

• Both electronegativity and atomic radius increase.
• Both electronegativity and atomic radius decrease. 
• Electronegativity increases and atomic radius decreases.
• Electronegativity decreases and atomic radius increases.

In a redox reaction, which particles are lost and gained in equal numbers?

• electrons

• neutrons

• hydroxide ions

• hydronium ions