CH 20 Electrochemistry

What is the definition of "basic research"?

• Research aimed at increasing fundamental knowledge without immediate practical application

• Research focused on developing new products for the market

• Research conducted only in industrial laboratories

• Research that involves only simple experiments

What is the primary goal of a chapter on electrochemistry?

• To understand the chemical processes involving electricity

• To memorize the periodic table

• To learn about organic reactions

• To study only physical changes in matter

Tags

NGSS.HS-PS2-5

What is the primary driving force for lightning and batteries?

• The movement of electrons

• The flow of water

• The increase in temperature

• The presence of sunlight

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which of the following best describes how lightning is generally formed?

• By the rapid movement of electrons between clouds and the ground

• By the condensation of water vapor in the atmosphere

• By the rotation of the Earth

• By the absorption of sunlight by clouds

Tags

NGSS.HS-PS3-5

How does a battery generally operate?

• By converting chemical energy into electrical energy through redox reactions

• By storing heat energy for later use

• By absorbing light and converting it to electricity

• By using magnets to generate electricity

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the definition of oxidation?

• The gain of electrons by a substance

• The loss of electrons by a substance

• The combination of a substance with hydrogen

• The splitting of a molecule into two parts

Tags

NGSS.HS-PS1-1

Which of the following is an example of reduction?

• Iron rusting in air

• Hydrogen gas gaining electrons to form H2

• Magnesium losing electrons to form Mg2+

• Sodium reacting with chlorine to form NaCl

Tags

NGSS.HS-PS1-2

Why can balancing redox reactions be more challenging than balancing other types of reactions?

• Because redox reactions do not involve electron transfer

• Because redox reactions require balancing both mass and charge

• Because redox reactions only occur in basic solutions

• Because redox reactions are always endothermic

What method is commonly used to balance redox reactions and why?

• The trial and error method, because it is the fastest

• The half-reaction method, because it allows separate balancing of oxidation and reduction

• The combustion method, because it is used for all reactions

• The precipitation method, because it balances ions

Which of the following is the first step in the general procedure for balancing aqueous redox reactions in acidic solution?

• Balance the oxygen atoms

• Write the unbalanced equation

• Balance the hydrogen atoms

• Add electrons to balance charges