Is there any evidence that a new chemical substance is produced in the overall reaction?

Temperature changes are sometimes used as evidence to indicate that a chemical reaction, which produces a new chemical substance, has occurred.

Is complete combustion possible?

However, complete combustion is almost impossible to achieve, since the chemical equilibrium is not necessarily reached, or may contain unburnt products such as carbon monoxide, hydrogen and even carbon (soot or ash). Thus, the produced smoke is usually toxic and contains unburned or partially oxidized products.

Which equation identifies the reactants and products of a combustion reaction?

A: The burning of fuel is a combustion reaction. The general equation for this type of reaction is: Fuel + O2 → CO2 + H2O.

What evidence show that reaction occurs?

Chemical reactions can be identified via a wide range of different observable factors including change in color, energy change (temperature change or light produced), gas production, formation of precipitate and change in properties.

What word chemical equation describes a chemical reaction?

Glossary. chemical equation: Describes a chemical reaction. product: Are the end-result of the reaction and are written on the right-hand side of the equation. reactant: Starting materials and are written on the left-hand side of the equation.

Does combustion always produce water?

A combustion reaction always includes a hydrocarbon and oxygen as the reactants and always produces carbon dioxide and water as products.

How do you calculate heat of combustion?

Find the amount of substance burned by subtracting the final mass from the initial mass of the substance in g. Divide q in kJ by the mass of the substance burned. The answer is the experimental heat of combustion in kJ/g.

What is the word equation for the combustion of propane?

The balanced chemical equation for the combustion of propane is: C3H8(g)+5O2(g)→3CO2(g)+4H2O(g).

What is the mechanism for the rising of hot air?

16 Answers 16. The mechanism responsible for the rising of hot air is flotation: Hot air is less dense than cold air and hence air pressure will exert an upwards force, in the same way air rises in water.

What is the percentage of hot water to cold water in mixture?

H-C 180-40 140 = 71.5\% of mixtureis hot water \% of cold water in mixture is: H-M = 180-140 = 40 = H-C 180- 40 140 28.5\% of mixture is cold water.

What is the relation between air pressure and water vapour concentration?

The water vapour concentration is expressed here as mole fraction in air, rather than as vapour pressure. Air is involved in the psychrometric equation, because it brings the heat required to evaporate water from the wet surface. The constant B is therefore dependent on total air pressure, P.

What was the first experiment to prove that water has air?

Experiment to prove that water has air. up vote 8 down vote favorite. In elementary school, there was an experiment to show that water has dissolved air, which involved boiling some water and observing the drops at the surface of the container, and this proved that water has air.