Thermal energy VS Thermochemistry
What is Thermochemistry?
a. describes the flow of heat (thermal energy) due to temperature differences and the subsequent temperature distribution and changes
b. a thermodynamic quantity equivalent to the total heat content of a system
c. the study of heat changes that happen during chemical reactions
C: THE STUDY OF HEAT CHANGES THAT HAPPEN DURING CHEMICAL REACTIONS
In the chemical equation 2H2 + O2 =2H2O
which substance is the product?
a. 2H2 + O2
c. 2H20
C: 2H2O
Is the Example given below Endo or Exo?
A producer carries out photosynthesis
ENDOTHERMIC BECAUSE THE ENERGY IS BEING ABSORBED
What Is the Definition Of a Reactant?
a. A process in which heat is absorbed
b. A substance produced during a chemical reaction
c. A substance that takes part in and undergoes change during a reaction
C = A Substance That Takes Part In And Undergoes Change During A Reaction.
Exothermic reaction definition?
a. a reaction in which energy is released in the form of light or heat
b. any chemical reaction that absorbs heat from its environment
c. Anything that has matter and takes up space
A: a reaction in which energy is released in the form of light or heat
What is thermal energy?
a. the result of the movement of tiny particles called atoms
b. the total kinetic energy of the particles within a substance
c. energy of the system as a state function
B: THE TOTAL KINETIC ENERGY OF THE PARTICLES WITHIN A SUBSTANCE
In the reaction Na + Cl = NaCl which substance is the reactant?
a. Na + Cl
c. NaCl
A: Na + Cl
Is the Example given below Endo or Exo?
A flammable material is burning
EXOTHERMIC BECUASE THE ENERGY IS BEING RELEASED.
What Is the Definition Of Product?
a. Total kinetic energy (motion)
b. The process by which one or more substances change to produce one or more different substances
c. an article or substance that is manufactured or refined for sale.
C = An Article Or Substance That Is Manufactured Or Refined For Sale
What is the definition of Endothermic reaction?
a. The smallest part of a substance that keeps all the chemical properties of that substance.
b. any chemical reaction that absorbs heat from its environment
c. The natural environment where a particular species of plant or animal typically lives and grows
B: any chemical reaction that absorbs heat from its environment
What is the difference between thermal energy and thermochemistry?
a. Thermal energy is about heat in general, while thermochemistry focuses on heat in chemical reactions.
b. Thermal energy is about heat in general, while thermochemistry focuses on heat in chemical reactions.
c. Thermal energy is the heat you feel when you touch something hot, while thermochemistry is the magic that makes things hot in the first place.
B
Where are the reactants typically written in a chemical equation?
a. on the left-hand side
b. in the middle
c. on the right-hand side
A: ON THE LEFT HAND SIDE
Is the Example given below Endo or Exo?
A chef is cooking an egg
ENDOTHERMIC
What is the Definition of Thermal Energy?
a. energy contained within a system that is responsible for its temperature.
b. energy which a body possesses by being in motion.
c. A process in which heat is released.
A = Energy Contained Within A System That Is Responsible For Its Temperature
What is the definition of photosynthesis?
a. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
b. The set of chemical reactions that occur in living organisms to convert food into energy and build or repair cellular components
c. A metabolic process where cells break down glucose using oxygen to produce energy (ATP), releasing carbon dioxide and water in the process
A: the process by which green plants and other organisms use sunlight to synthesize food from carbon dioxide and water.
Which statement is true?
a: Thermal energy always increases during an exothermic reaction
b: Thermochemistry studies the average kinetic energy of particles in a substance
c: Thermal energy is concerned with heat transfer, while thermochemistry deals with enthalpy changes
B AND C
What is the difference between reactants and products in a chemical reaction?
a. Reactants are always solids, while products are always liquids in a chemical reaction.
b. Reactants are the substances present at the start of a chemical reaction, while products are the substances formed at the end of the reaction.
c. Reactants are the catalysts that speed up a reaction, while products are the substances that slow down the reaction.
B: Reactants are the substances present at the start of a chemical reaction, while products are the substances formed at the end of the reaction.
Is the Example given below Endo or Exo?
A pile of plant matter rots.
EXOTHERMIC
What Is the Definition Of Raidient Energy?
a. A process in which heat is absorbed
b. Total kinetic energy
c. The energy that is transferred by electromagnetic radiation
C= The energy that is transferred by electromagnetic radiation
Which of the following is the focus of thermochemistry but not thermal energy?
a: the temperature of a substance
b: The kinetic energy of particles
c: The heat of formation of chemical products
C
What is the definition of a product?
a. a substance that catalyzes a chemical reaction without being consumed.
b. a substance that is present at the beginning of a chemical reaction and is used up during the process.
c. a substance that is formed as a result of a chemical reaction.
C: a substance that is formed as a result of a chemical reaction.
Is the Example given below Endo or Exo?
A mammal carries out cellular respiration, breaking down sugars in its cells and creating body heat.
EXOTHERMIC
What Is the Definition of Thermochemistry?
a. A protein that increases the rate of a chemical reaction without being changed by the reaction; an organic catalyst
b.the branch of chemistry concerned with the quantities of heat evolved or absorbed during chemical reactions.
c. : A force that pulls things together
B: the branch of chemistry concerned with the quantities of heat evolved or absorbed during chemical reactions.