The least reliable indicator of a chemical change is shape. Change of shape usually indicates a physical change, unless the material change resulted from a recombination or decomposition of the material's chemical form, as in the rotting of vegetable matter.
No, mold growth is a biological process that involves the decomposition of organic matter by fungi. It is not a chemical change because the molecular structure of the substances involved remains the same.
You can be sure that a chemical change has occurred if there is a change in color, formation of a precipitate, evolution of gas, or absorption/release of heat during the reaction. These are all indicative of a chemical reaction where the substances are transformed into different compounds with new chemical properties.
Yes, wood rotting is a chemical change. It involves the breakdown of the wood's structure by fungi or bacteria, which changes the chemical composition of the wood through processes like hydrolysis and oxidation.
Color is the least reliable physical property for identifying minerals because many minerals can have the same color but different compositions.
Phase changes are one example of a non chemical change. If the substance reacts the same way chemically, it has the same properties such as melting point, there has not been a chemical change.
No, the least reliable indicator of a chemical change is shape. Change of shape usually indicates a physical change, unless the material change resulted from a recombination or decomposition of the material's chemical form, as in the rotting of vegetable matter.
Skin turgor in geriatric clients is not a reliable indicator of fluid status, because as people age the skin normally loses its elasticity.
At least 2 of the reactants must change their chemical formula.
At least one change in chemical bonding.
Color is generally considered the least reliable mineral identification property because many minerals can have a variety of colors due to impurities or variations in chemical composition.
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It is a physical change at least that is what I've been told
No, mold growth is a biological process that involves the decomposition of organic matter by fungi. It is not a chemical change because the molecular structure of the substances involved remains the same.
The formation of a new substance is the criterion for a chemical change. You can't have a chemical change without the formation of at least one new substance. As you can't observe a chemical property without setting a chemical change in motion, the answer to your question is yes.
Color is the least reliable property for identifying a mineral because many minerals can have the same color but different compositions.
Nuclear change usually (but not always) changes the element of an atom itself; at the very least, it changes the isotope of the atom, altering its radiological properties (such as its half life). A chemical change means a change to a molecule in which the atom is bound.
Both, strangely enough. Applying the paint to the car is a physical change. The paint is a polyurethane compound. When you get it, it's in at least two containers - the paint, and a hardener. Stir them together and they undergo a chemical change.