Worksheets17.1: The Flow of Energy
Total questions: 24
Worksheet time: 12mins
The study of energy changes that occur during chemical reactions and changes in state.
Thermochemistry
Biochemistry
Analytical chemistry
The energy stored in the chemical bonds of a substance is called ......................................
chemical kinetic energy.
chemical potential energy.
physical potential energy.
The kinds of atoms and the arrangement of the atoms in a substance determine the amount of energy stored in the substance.
True
False
Energy changes occur as either heat transfer or work, or a combination of both.
True
False
Heat, represented by q, is energy that transfers from one object to another because of a temperature similarity between the objects.
True
False
................................. is the part of the universe on which you focus your attention.
A system
A surrounding
States that “in any chemical or physical process, energy is neither created nor destroyed”.
The Boyle's law.
The Avogadro's law.
The law of conservation of energy
During any chemical or physical process, the energy of the universe remains unchanged.
True
False
An .......................... is one that releases heat to its surroundings.
endothermic process
exothermic process
Heat is absorbed from the surroundings in an ........................
endothermic process.
exothermic process.
Heat flowing out of a system into its surroundings has a ..........................
negative value.
positive value.
Heat flowing into a system from its surroundings has a .......................................
negative value.
positive value.
A ...............is defined as the quantity of heat needed to raise the temperature of 1 g of pure water 1°C.
calorie
joule
The SI unit of energy.
calorie
joule
The amount of heat needed to increase the temperature of an object exactly 1°C is the ...............................
heat of fusion.
heat capacity of that object.
heat of vaporization.
The heat capacity of an object depends on both its mass and its chemical composition.
True
False
The smaller the mass of the object, the .................... its heat capacity.
greater
smaller
The specific heat capacity, or simply the specific heat, of a substance is the amount of heat it takes to raise the temperature of 10 g of the substance 100°C.
True
False
Water has a very high specific heat compared with the other substances in the table.
True
False
Metals generally have high specific heats
True
False
The units of specific heat are either J/g or cal/g.
True
False
The same amount of heat affects the temperature of objects of the same mass with a high specific heat much less than the temperature of those with a low specific heat.
True
False
When 400 J of heat is added to 4.3 g of palm oil at 25oC, the temperature increases to 89oC. What is the specific heat of the palm tree?
1.45 J/(C.g)
0.688J/(C.g)
1720J/(C.g)
Convert 2.5 joules into calories.
0.6 calories
10.5 calories
5.3 calories
