The black coloured precipitate that form is IRON ll SULPHIDE, FeS.
Iron sulphide ll sulphide is black in colour and is insoluble in water. It possess very high melting temperature and react in acids. Iron ll sulphide is used as pigment in hair dyes, glasses, bottles and paints. It is also used as lubricant.
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1. If the temperature of a gas is increased by 4x, its volume A. will increase by 4x.
2. If the pressure of a gas is decreased by 4x, its volume A. will increase by 4x.
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Explanation:</h3>
The combined gas law combines the three gas laws; Boyle's law, Charles law and Gay Lussac's law together relating pressure, temperature & volume and states thus:
"The ratio of product of Pressure and Volume to that of its Temperature is a constant."
In mathematical terms,
where P1, V1, T1 are the initial values and P2, V2, T2 the final values.
Therefore,
.......................................(1)
......................................(2)
1. If temperature of gas is increased by 4x, keeping pressure constant, from(1) since the volume of gas is directly proportional to its temperature (by Charles' law); it will increase in the same rate as the temperature is increased. Hence, the volume will increase by 4x.
2. If the pressure of a gas is decreased by 4x, keeping temperature constant, from (2), since the pressure of a gas is inversely in proportion to its volume (by Boyles' law), a decrease in pressure leads to increase in volume and vice versa. Hence, the volume will increase by 4x.
Answer:
Molecules in order of decreasing rate of effusion:
Explanation:
Mass of gas=
Mass of gas =
Mass of gas =
Mass of gas =
According Graham's law:
'The rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas'.The equation given by this law follows the equation:
So, higher the molecular mass of the gas lower will be the effusion rate and vice versa.
Increasing order of molecular masses of the given gases:
Decreasing order of effusion rate respective to gases:
Molecules in order of decreasing rate of effusion:
Answer:
1) Los gases naturales son inflamables porque el natural contiene metano junto con una pequeña cantidad de otros gases orgánicos, lo que hace que una mezcla de entre 5 y 15% de concentración de gas natural con aire u oxígeno se queme por completo cuando se enciende.
2) El petróleo crudo, que son depósitos de hidrocarburos que se encuentran en depósitos naturales en las formaciones subterráneas de la Tierra, se obtiene perforando un pozo en el yacimiento de petróleo a través del cual se permite que una parte importante del petróleo fluya fuera del yacimiento bajo la presión del yacimiento para recibir procesamiento e instalaciones de almacenamiento en la superficie
3) El carbón se forma cuando se aplica compactación y calor a la turba que proviene de material vegetal muerto enterrado durante un período de varios millones de años.
4) Los combustibles fósiles se consideran una fuente de combustible no renovable porque la velocidad a la que se produce es más rápida que la velocidad a la que se forma.
Una fuente de energía renovable, como la energía eólica, es producida por la naturaleza tan rápido como se consume para generar energía.
Explanation: