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) I(g) + e → I-(g)
b) I2(g) → 2I(g)
c) I(g) → I+(g) + e
d) Na(g) + I(g) → NaI(s)
e) Na(s) + 1/2I2(s) → NaI(s)
Of these options the correct answer is e).
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∙ 14y ago
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If you have the heat of formation of a substance at a given temperature how do you calculate its heat of formation at a different temperature?
Say u know heat of formation at temperature Ta and u want to calculate it at a temperature Tb Delta H(at Tb) = Delta H(at Ta) + integral of (Heat capacity) from Ta to Tb
What is in fossil fuel and released in the form of kinetic energy when burned?
The heat is produced by the formation of chemical bonds between carbon and oxygen, and between hydrogen and oxygen. So CO2 and water are the necessary products when fossil fuel is burned, without which there would be no heat.
When you heat water by which method heat travels in water?
There is more than one way to heat water, so I would not apply this to all situations, but in general, when you heat water you create convection currents which cause the hotter water to mix in with the colder water.
Is the earths formation a source of thermal energy?
Much of the Earth's heat was leftover when the planet was formed
Why must heat energy be supplied to melt ice?
Water has hydrogen bonds that can hold a large amount of heat. These bonds are even stronger in ice. The electrons in the water molecules are slower as there is an absence of energy (heat ). That means that the electrons in the hydrogen will create a small but substantial bond as they loop around, making the already present hydrogen bond stronger. The molecules will become more compact and will result in ice formation. To weaken it, energy (heat) must be added to make these electrons spin faster and create a weaker bond between them. This will result in less compact water molecules (liquid water).
What are 3 requirements for cloud formation?
heat , water and air
What is the formula for finding heat formation?
Heat of combustion of a hydrocarbon is based on the reaction: fuel + oxygen --> carbon dioxide + water (unless you have some nitrogen or sulfur in the fuel, in which case it gets a little more complex) The heat of formation of O2 is zero (O2 is the reference state) The heat of formation of CO2 is the same as the heat of combustion for carbon The heat of formation of H2O is the same as the heat of combustion for hydrogen To find the heat of formation of the fuel, you subtract the heat of combustion from the heats of formation - (weighted with the stoichiometric coefficients from the balanced reaction equation).
Is the formation of water endothermic or exothermic?
The process is endothermic because the water is absorbing heat from the kettle. When energy (heat) is released as steam this is exothermic.
What is the heat of formation of SO2?
The standard heat/enthalpy of formation of SO2 is -296.8 KJ
How does water make you cooler?
when we sweat , water use the body heat for vaporisation as water to vapour formation is a endothermic reaction. so the heat required for this reaction in case of sweat evaporation is body heat. as our body lose heat, our body becomes cool.
What is the heat of formation of n2O4?
The heat of formation of zinc nitrate is -2304 kJ.
Why does well water bubble?
Every action hs a reaction. If yu heat it , it's formation will change with the type of energy.
What is the reaction of caustic soada in water?
NaOH gives Na(aq.) and OH-(aq).....the heat of formation for sodium hydroxide is -425.6 kJ/mol (so it's exothermic).When you dissolve NaOH in water, the reaction is exothermic. But this is dissociation, the opposite of formation. So logically, you would flip the sign around for the heat of formation to get the enthalpy change of the dissociation, right? But if you do, the enthalpy change becomes +425.6 kJ/mol, which means that it is endothermic. However, the dissolving of NaOH in water releases heat to the environment, so it's exothermic!
What is released as sensible heat during the formation of clouds?
Latent heat.
What property of water is NOT attributable to hydrogen bonding between water molecules A heat storage B ice formation C polarity D cohesion?
Transparency and wetness.
Does water requires the addition of heat to turn into vapor?
Yes, water typically requires the addition of heat to turn into vapor. This process is known as evaporation, where the heat energy breaks the bonds between water molecules, allowing them to escape into the air as water vapor.
Why water demineralized used in a boiler?
In water a lot of impurities are present when we use such water it will produce slice formation inside the tube of boiler due to which there is slice formation takes place and heat will not transfer properly . temperature of the boiler tubes are about 1400 degree centigrade.if heat is not flow properly through tubes then tubes will melt.
