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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.
What else can I help you with?
When water is boiled in a pot it bubbles Is this the result of a chemical reaction Explain why or why not?
The bubbling of water when boiled is not the result of a chemical reaction. It is due to the conversion of liquid water to water vapor, which forms bubbles as it rises to the surface. This process is physical in nature, involving the phase change from liquid to gas.
Can you explain how acid donates a proton in a chemical reaction"?
In a chemical reaction, acid donates a proton by releasing a hydrogen ion (H). This proton transfer helps to form new bonds and change the properties of the substances involved in the reaction.
Do you think a chemical reaction has taken place Can you explain your reasoning behind your conclusion?
Yes, a chemical reaction has likely taken place if there is a change in the chemical composition of the substances involved. This can be observed through the formation of new substances, changes in color, temperature, or the release of gas. These are all indicators that a chemical reaction has occurred.
Explain why dissolving is a physical change?
All physical changes are reversible because the molecules do not undergo change in any chemical reaction even in in the change in the state of matter. NaCl is a salt compound and each molecules gets easily dissolved in water and the salt recovered by evaporation of water.
Is burning a match a phase change?
Burning a match is not a phase change. A phase change refers to a physical change in the state of matter, such as melting, freezing, vaporization, or condensation. When a match burns, it undergoes a chemical change as the reactants (matchstick and oxygen) are transformed into new substances (carbon dioxide, water vapor, and ash) through a combustion reaction. This chemical change involves the breaking and forming of chemical bonds, rather than a change in the state of matter.
Explain what a chemical change is?
A chemical change is when a substance undergoes a transformation that results in the formation of one or more new substances with different chemical properties. This typically involves the breaking and forming of chemical bonds between atoms. Examples of chemical changes include rusting of iron and burning of wood.
When water is boiled in a pot it bubbles Is this the result of a chemical reaction Explain why or why not?
The bubbling of water when boiled is not the result of a chemical reaction. It is due to the conversion of liquid water to water vapor, which forms bubbles as it rises to the surface. This process is physical in nature, involving the phase change from liquid to gas.
Explain why burning butter is a chemical change but melting is not?
Melting: change of phase, a physical phenomenon without change of the composition. Burning: a reaction of oxydation, a change of composition - a chemical change.
What is a purpose of a chemical equation?
A chemical equation lets humans explain a chemical reaction. When the same reaction occurs repeatedly, the equation serves to remind us of what happened in the reaction.
If steam escapes from a teapot is that chemical reaction explain please?
yes and no, it depends on what you would consider a chemical reaction. most people define a chemical reaction as when two or more chemicals react together, steam escaping from a pot, however, is not two chemicals, it is just water evaporating and condensing in the air to make steam which is hotter than air so it rises out of the pot, so it isn't a chemical reaction, so much as a 'change of chemical state'.
What is the purpose of a equated?
A chemical equation lets humans explain a chemical reaction. When the same reaction occurs repeatedly, the equation serves to remind us of what happened in the reaction.
What is neutrailization explain with an example?
neutrallization is a chemical reaction of acid and alkali
Is twisting a wire chemical or physical change explain?
It is physical. The wire changes shape, but it is still made of the same materials.
Must new substances be formed when you observe a chemical property explain?
Yes , it should or else it is a physical property
Is it a chemical or physical change when heat is put over sugar?
its physical change.to explain,the conversion of solid to liquid is physical
Explain how wood burning in a fire place undergoes a chemical change?
Burning is an oxydation reaction so a chemical change.
Is berning methane a chemical racton explain?
Burning methane is a chemical reaction, because you are reacting it with oxygen. Work on your spelling as well.
