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Black smoke from candle physical change or chemical change?
The black smoke produced from a burning candle is a physical change. This is because the change in appearance (from no smoke to black smoke) does not involve a change in the chemical composition of the candle wax or the oxygen in the air. The black smoke is primarily made up of tiny carbon particles that result from incomplete combustion of the candle wax.
What color occurs when the indicator is added and starch is added?
When an indicator such as iodine is added to a solution containing starch, a blue-black color change occurs. This reaction is commonly used to detect the presence of starch, as the blue-black color is characteristic of this complex formed between the starch and iodine molecules.
How does the process of black hair turning white occur and what factors contribute to this change?
The process of black hair turning white occurs when the pigment-producing cells in the hair follicles gradually decrease in activity, leading to a loss of melanin, the pigment that gives hair its color. Factors such as genetics, age, stress, and certain medical conditions can contribute to this change.
Why do the cell walls of onions turn blue-black when put with iodine?
The blue-black color change occurs due to the reaction between iodine and starch present in the onion cell walls. When iodine comes in contact with starch, it forms a complex that absorbs light in the visible spectrum, giving the characteristic blue-black coloration.
Would stool be black any tarry from upper gastro or colon bleeding?
Black, tarry stool could be indicative of upper gastrointestinal bleeding (such as from the stomach or esophagus) or bleeding in the colon. This color change occurs due to the breakdown of blood as it moves through the digestive system. It is important to consult a healthcare provider promptly for further evaluation and treatment.
Is black tea a physical change or chemical change?
physical change
Is black crystals of iodine turning into purple vapour of iodine a physical change or a chemical change?
The transformation of black crystals of iodine into purple vapor of iodine is a physical change. This is because the change does not involve a change in the chemical composition of iodine; it only involves a change in the physical state from solid to gas.
When glass turns black from fire is it a physical or chemical change?
chemical
Black smoke from candle physical change or chemical change?
The black smoke produced from a burning candle is a physical change. This is because the change in appearance (from no smoke to black smoke) does not involve a change in the chemical composition of the candle wax or the oxygen in the air. The black smoke is primarily made up of tiny carbon particles that result from incomplete combustion of the candle wax.
Why is it physical change if the steel wool turned the black pot shiny silver?
Physical change: the steel wool only changes the black pot's shape and in doing so reveals another color in the pot or the color of the substance that the pot is made from; it would still be the same thing but there would be all the parts of the pot, just it would be in different pieces.
Is Melting coin being heated and turn black this is used as a test for metal a chemical or a physical change?
The melting of a coin due to heat is a physical change as it alters the physical state of the coin from solid to liquid without changing its chemical composition. The black color that appears is likely due to the formation of an oxide layer on the surface of the coin, also a physical change.
Is a silver teapot turning black a chemical or physical change?
It is a chemical change but it can be reversed since that cahnge is only on the surface. It is merely an oxidization that occurs when silver is exposed to oxygen and has no contact with oil (which blocks the pores of the metal from reacting with oxygen).
A shiny black solid was heated and formed a purple vapour which on cooling became a black solid again Is this a physical or chemical reaction and explain?
This is a physical change. The solid is Iodine, which sublimes on heating to form gaseous Iodine. When cooled, it sublimes again to form solid Iodine. Since this change is only the change of physical states, and since there's no change in the chemical structure of Iodine, this is a physical change.
Does a chemical change cause a substance to have new physical properties?
It affects it so ya Anyways, water becomes black and shines really bright when it is affected to magnesium and cesium bromide
If you put a banana in a warm cupboard for a week will it turn black and will it be chemical or physical change?
If you put a banana in a warm cupboard for a week, the likelyhood of it turning black is very high. This is a chemical change, as it is caused by the internal decomposition (breaking down) of the sugars contained by the fruit. Please note for future that a physical change is in nearly always a change in state, including disolvsion in a solvent.
When a raw egg is broken is that a physical or chemical change?
it is a physical change because the mass of the egg did not alter and nothing "new" was created. For example, If you squish a marshmallow, it did not change mass, nor create anything new, so it means a physical change. BUT if you roast/burn a marshmallow, the black carbon on the edges was created, therefor, it is a chemical change. hope this helped! science is tough!
What color change would you see when iodine is applied to a freshly cut potato?
The colour expected would be Black, as a reaction between the iodine and potato starch occurs to give a black complex.
