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17 Terms
Rubbing your hands using laundry powder (washing powder) and water
«in terms of: thermal change»
your hands feel warm
The transformation of a substance from the solid state to the gaseous state directly
«in terms of: thermal change»
the temperature of the surroundings decreases
adding ammonium nitrate to a polystyrene cup containing 100 ml of water
«In terms of: Thermal change»
The temperature of the surroundings decreases
increasing the mass of sodium hydroxide dissolved in water
«In terms of: Thermal change»
The amount of change in temperature increases
heating blue hydrated copper sulphate salt
«In terms of: Color change»
It turns into white anhydrous copper sulphate
adding water to anhydrous cobalt chloride
«In terms of: Color change»
It turns into pink hydrated cobalt chloride
diluting concentrated hydrochloric acid by adding water to it?
A large amount of thermal energy is released leading to a violent instant boiling of water and splashing of acid outside the reaction container which may cause severe damage
doubling the mass of solute while keeping the volume of solvent constant
«In terms of: Temperature»
The temperature usually changes by a constant amount
pressing on instant cold compresses
The thin bag ruptures, causing the solute to mix with water and an endothermic dissolution occurs
the occurrence of a chemical reaction in terms of the bonds present between the atoms of the reactant molecules and the product molecules.
The bonds between the atoms of the reactant molecules are broken (endothermic process) and new bonds are formed between the atoms of the product molecules (exothermic process)
the reaction of magnesium with dilute hydrochloric acid
An amount of thermal energy as a product of the reaction is released to the surroundings, causing its temperature to rise
Pressing the button found in the bottom of the self heating can
The thin membrane which is between calcium oxide and water ruptures, so calcium oxide reacts with water forming calcium hydroxide solution with releasing heat
combustion of hydrocarbons (as methane gas) in air
Carbon dioxide gas and water vapor are formed through an exothermic reaction
CH4 (g) + 2O2 (g) \xrightarrow{\Delta} Co2 (g) + 2H2O(v) + Heat
Complete combustion of acetylene gas in the presence of excess oxygen gas
The oxyacetylene flame is formed, which reaches a temperature of 3000℃
Drops of glycerin are added to potassium permanganate powder
A spontaneous exothermic reaction occurs, leading to the emission of smoke with the formation of a purple-coloured flame
a stream of air is passed over red-hot copper powder
Copper combines with oxygen of atmospheric air forming black copper oxide compound
2Cu(s) + O2 (g) \xrightarrow{\Delta} 2CuO(s)
A stream of hydrogen gas is passes over black copper oxide with heating
Reddish-brown copper is formed
CuO(s) + H2O(v) + Cu(s)
