Identify as element, compound, solution, or mechanical mixture.
a) a cloudy liquid is left to stand for several hours. At the end of this time, it is more cloudy toward the bottom of the liquid.
b) A clear, colourless liquid is heated. It first boils at a constant temperature, but after a period of time, the temperature increases. The liquid continues to boil at a higher fixed temperature.
c) A colourless gas is reacted with burning phosphorus. Part of the gas is unaffected, regardless of the amount of phosphorus used.
d) A solid has a sharp melting point. When heated strongly, it decomposes into another solid and a gas.
Physical change or chemical change?
a) the addition of flour to water
b) the tarnishing of silver
c) the formation of dew
d) the rotting of food
e)the melting of solder
THANKS
a) a cloudy liquid is left to stand for several hours. At the end of this time, it is more cloudy toward the bottom of the liquid.
b) A clear, colourless liquid is heated. It first boils at a constant temperature, but after a period of time, the temperature increases. The liquid continues to boil at a higher fixed temperature.
c) A colourless gas is reacted with burning phosphorus. Part of the gas is unaffected, regardless of the amount of phosphorus used.
d) A solid has a sharp melting point. When heated strongly, it decomposes into another solid and a gas.
Physical change or chemical change?
a) the addition of flour to water
b) the tarnishing of silver
c) the formation of dew
d) the rotting of food
e)the melting of solder
THANKS