The inherent energy of matter that transforms into heat during chemical reactions is called:
- anuclear energy
- bchemical energy
- cmechanical energy
- dpotential energy
293 questions · 23 sections
The inherent energy of matter that transforms into heat during chemical reactions is called:
Atoms remain connected to one another by means of:
The energy by which atoms remain joined with another atom in a chemical bond is called:
In sodium chloride, the bond between sodium ion and chloride ion is:
In carbon dioxide, the bond between carbon and oxygen is:
In iron, atoms are bonded together due to:
Which of the following correctly defines bond energy?
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of (triple) is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
Bond energy of is:
To break one bond, the heat required is:
Forming one bond evolves:
Which has the highest single-bond energy among halogens with hydrogen?
The energy that keeps molecules of a covalent compound combined with each other is:
In water, surrounding molecules are combined to a central water molecule by:
In sodium chloride, how many chloride ions surround a sodium ion?
In sodium chloride, how many sodium ions surround a chloride ion?
Compared to inter molecular energy of covalent molecules, the attraction energy between ions of an ionic compound is:
Why do ionic compounds have higher melting and boiling points than covalent compounds?
At room temperature, ionic compounds usually exist as:
At room temperature, covalent compounds usually exist in:
Which covalent compound is an exception that remains solid at room temperature?
Compared to inter molecular energy in , the inter molecular energy in is:
Energy of reactants needed to make a reaction occur or energy released from a reaction may be in the form of:
The unit earlier used to measure energy was:
The heat applied to raise the temperature of 1 gram of water by 1°C is called:
1 kilocalorie equals:
The international standard unit to measure energy is:
A joule is the work done by a force of:
1 kJ equals:
1 calorie equals approximately:
1 kcal equals approximately how many joules?
Reactions in which heat is evolved are called:
Reactions in which heat is absorbed are called:
In exothermic reactions, the value of ΔH is:
In endothermic reactions, the value of ΔH is:
The internal energy of a substance at a specific temperature is denoted by:
ΔH equals:
In an exothermic reaction:
In an endothermic reaction:
If reactant internal energy is 50 kJ/mol and product internal energy is 20 kJ/mol, ΔH equals:
If reactant internal energy is 70 kJ/mol and product internal energy is 80 kJ/mol, ΔH equals:
Burning of methane produces how many kJ per mole?
The reaction has ΔH equal to:
When water is poured on dry lime , calcium hydroxide is formed and how much heat is produced?
The reaction is:
The decomposition of to and requires how much heat?
The reaction has ΔH equal to:
The reaction of preparing edible lime from snail/oyster shells is:
Snail shells contain about what percentage of calcium carbonate?
In an exothermic reaction equation, the word "Heat" is written:
In an endothermic reaction equation, the heat term may appear:
ΔH using bond energies equals:
Energy required to break bonds is:
Energy released when new bonds form is:
In an exothermic reaction, the relation between (bond energy of reactants) and (bond energy of products) is:
In an endothermic reaction, the relation between and is:
For the reaction given , , , kJ/mol, total energy to break bonds in reactants:
For the same reaction, total bond energy released forming products:
ΔH for the reaction is:
The reaction is:
ΔH calculated by internal energy method versus by bond energy method:
Chemical energy can transform into:
When wood/natural gas/coal is burnt, the energy primarily obtained from:
Burning is essentially the reaction of a substance with:
The main ingredient of natural gas is:
Fireworks emit light, sound and:
The batteries used in torches and remotes are:
The batteries used in buses and trucks are:
In a Daniell cell, the metal stick used in solution is:
In a Daniell cell, the metal stick used in solution is:
The reaction in a Daniell cell is:
The Daniell cell transforms chemical energy into:
Chemical energy is the most used form of energy among:
Heat from burning wood is used for:
Industries that require huge amount of heat include:
Mineral fuels are burnt in burning chambers of heat engines to produce heat which is converted to:
Chlorophyll helps plants utilize:
Photosynthesis produces glucose () and:
The sunlight participating in photosynthesis remains stored in plants as:
Without chemical energy:
Petroleum, coal and natural gas are called:
Burning fossil fuels yearly produces approximately how many billion tons of ?
is a:
reacts with rain water to produce:
Excessive use of fossil fuels will:
Acid rain is harmful to:
Burning fuel in insufficient air produces:
Carbon monoxide is:
Natural fuels are of crude form and contain compounds of:
If unrefined fuel is burnt, oxides of N/S/P enter air and form:
The reaction produces:
Sulfur dioxide and oxygen react to form:
Sulfur trioxide and water react to form:
The reactions of / with water produce nitric acid involving:
Smoke from automobiles consists of:
In presence of sunlight, automobile smoke gases react to form:
Acid rain in water bodies makes survival of fishes:
Trees take in during:
About what fraction of yearly produced remains on earth?
is a heavy gas and:
The increase of earth's temperature due to greenhouse gases is called:
The phenomenon of heat-trapping by greenhouse gases is called:
Global warming melts polar ice and causes sea level to:
Which country among the following is at risk of being submerged due to sea level rise?
The other name of ethanol is:
The formula of ethanol is:
All automobiles in USA use fuel mixed with what percentage of ethanol?
Burning ethanol produces:
Ethanol may be a suitable substitute for:
The mechanism that converts chemical energy directly into electrical energy or uses electrical energy to conduct chemical reactions is:
Electrochemical cells are of how many kinds?
The cell in which electricity from an outer source is used to carry out a chemical reaction is:
The cell in which a chemical reaction produces electricity is:
Conductors are of how many types based on the mechanism of passage of electricity?
Substances through which electricity is passed by means of electrons are:
Which of the following is an electronic conductor?
Graphite is an electronic conductor because:
Substances that conduct electricity in molten/solution state but not in solid state and undergo chemical change are:
Which of the following is an electrolyte?
Strong electrolytes are completely ionized in:
Which is a strong electrolyte?
Which of the following is a weak electrolyte?
Pure water is a:
Sulfuric acid () is a:
An electrode is:
In an electrochemical cell, the electrode where oxidation occurs is:
The electrode where reduction occurs is:
In oxidation at an electrode, the species:
Positive ions accept electrons at the:
Electrolysis of molten sodium chloride produces at the anode:
Electrolysis of molten sodium chloride produces at the cathode:
Overall reaction of electrolysis of molten NaCl:
In molten NaCl, the migrating species are:
The anode in electrolysis is connected to which terminal of the battery?
The cathode is connected to which terminal of the battery?
At the anode of molten NaCl electrolysis:
At the cathode of molten NaCl electrolysis:
The ion attracted by the cathode is called a:
The ion attracted by the anode is called a:
Wet blue litmus paper held over chlorine gas turns:
+ produces:
The blue litmus turns red because of:
In concentrated NaCl solution, additional ions present besides and are:
At the cathode in NaCl solution electrolysis, which is reduced first?
The reaction at the cathode of NaCl solution electrolysis:
At the anode of NaCl solution electrolysis, the species discharged earlier than is:
Why does discharge before in NaCl solution electrolysis even though is lower in the series?
The species left behind in NaCl solution electrolysis combine to form:
Three factors that determine which ion discharges first are: tendency, concentration and:
The reactivity series of metals is also called:
Between two metals in the electrochemical series, the metal placed above is:
Between two metal ions, the ion of the metal at lower order will:
Between and , which discharges first at cathode?
Between and , which discharges first?
Between and , which donates an electron first at anode?
Between and , in absence of concentration effect, which discharges first?
In NaCl aqua solution with mercury cathode, which ion discharges first?
In NaCl aqua solution with platinum cathode, which ion discharges first?
The molarity of in 0.1 M NaCl is approximately how many times that of from water self-ionization?
In electrolysis of pure water, the anode and cathode are made of:
To increase decomposition of water during its electrolysis, a few drops of which acid is added?
Reaction at the cathode in electrolysis of water:
Reaction at the anode in electrolysis of water:
The gas produced at the cathode in electrolysis of water is:
The gas produced at the anode in electrolysis of water is:
Pure water acts like a:
Sulfuric acid is added during electrolysis of water to:
Active metals like alkali metals, alkaline earth metals, and aluminium are usually extracted by:
In electrolysis of molten alumina (), the metal is produced at:
In electrolysis of molten alumina, oxygen is produced at:
Reaction at the cathode in electrolysis of molten alumina:
Reaction at the anode in electrolysis of molten alumina:
Purification of metals like copper, zinc and lead uses:
In purification of copper by electrolysis, the impure metal is connected to:
In purification of copper by electrolysis, the pure electrode is connected to:
In electrolytic purification, the pure electrode:
Adding a coating of one metal on another metal by electrolysis is called:
Less reactive metals do not react with:
Metals commonly used in electroplating include:
To electroplate a spoon with silver, which solution is used?
In silver electroplating, the spoon is connected as the:
In silver electroplating, the silver foil acts as:
Reaction at the anode in silver electroplating:
Reaction at the cathode in silver electroplating:
Decomposition of in solution gives:
Aluminium is widely used in:
Iron is coated with which metals to prevent rusting?
Chlorine gas obtained from electrolysis of sea water is used as:
produced from electrolysis is used as:
The Daniell cell was invented by:
Year of invention of Daniell cell:
In a galvanic cell, the more reactive metal electrode is the:
In a galvanic cell, the less reactive metal electrode is the:
In a Daniell cell, zinc electrode is the:
In a Daniell cell, copper electrode is the:
Oxidation half-reaction in a Daniell cell:
Reduction half-reaction in a Daniell cell:
Total reaction in Daniell cell:
The galvanic cell transforms:
In a galvanic cell, the zinc rod is dipped in:
Electrons in a Daniell cell flow externally from:
The notation represents:
Electrodes of highly reactive metals like sodium, potassium, calcium are made by using:
An amalgam is a mixture of mercury and:
In a galvanic cell with copper and silver electrodes, the anode is:
In a galvanic cell with copper and silver electrodes, the cathode is:
Total reaction of Cu/Ag galvanic cell:
In an electrolytic cell, the anode is:
In a galvanic cell, the anode is:
In an electrolytic cell, the cathode is:
In a galvanic cell, the cathode is:
Electrolytic cells are used for:
Galvanic cells are used as the technology of:
A salt bridge typically contains agar-agar mixed with:
Salt bridge is shaped like:
The salt bridge ions and have:
Salt bridge maintains:
In a Daniell cell, surplus charge in the anode is balanced by:
The reduced positive charge in cathode solution is balanced by:
Without a salt bridge, the flow of electricity in a galvanic cell:
A dry cell is a kind of:
Dry cell transforms chemical energy into:
The anode in a dry cell is made of:
The cathode in a dry cell is:
The paste inside a dry cell contains , , and:
Anode reaction in a dry cell:
Cathode reaction in a dry cell:
Total cell reaction in dry cell:
Which acts as the oxidant in a dry cell?
Hydrogen fuel cell oxidizes hydrogen at the:
Hydrogen fuel cell reduces oxygen at the:
Hydrogen fuel cell produces:
Blood sugar measurement in diabetic patients uses the mechanism of:
In the blood sugar machine, glucose of blood is oxidized at the:
Lead-storage battery contains:
According to chemical properties, battery components are:
Throwing batteries randomly contaminates:
The reaction in which the nucleus of an element undergoes transformation is:
Two most significant types of nuclear reactions are:
The nuclear process where a heavy nucleus breaks into smaller nuclei is called:
The nuclear process where smaller nuclei combine into a larger nucleus is called:
Striking which particle on at low velocity causes fission?
The fission of produces:
How many neutrons are produced in the standard fission reaction shown?
The reaction is:
Fusion reaction is the basis of:
Reactions that do not require extra energy to continue once started are called:
Nuclear chain reactions are the basis of:
The reactor that helps control the chain reactions is called a:
Heat from fission reactor is used to produce:
Bangladesh's nuclear power plant is being set up at:
In the galvanic cell experiment, the LED's positive edge is connected to the:
In the galvanic cell experiment, the LED's negative edge is connected to the:
In the galvanic cell experiment, what continues to decay during operation?
Cautions for the galvanic cell experiment include keeping:
Dissolving in water is:
When dissolves, water temperature:
The energy required to break the crystal of comes from:
Adding lime () to water gives:
Reaction of and produces:
Conductors are how many kinds based on the mechanism of passing of electricity (sample question)?
Coating one metal with another metal through electrolysis is called:
Which particle is used to strike a nucleus during a nuclear fission reaction (sample)?
Electrolysis of NaCl aqueous solution with platinum electrode produces (multi-correct):
About the electroplating of iron with nickel: which is correct?
From the picture stem, what does plating do to iron?
Acid rain forms primarily from oxides of:
Why is acidified water called an electrolytic conductor?
Why is considered a strong electrolyte?
Why is a salt bridge used in an electrochemical cell?
Why is a few drops of sulfuric acid required in electrolysis of water?
Which one is a metallic conductor?
The reaction is:
The reaction is:
Compared with petroleum combustion, reaction also: