To understand if the black crust on the silver coins signifies a chemical or physical change, you should determine if the substance's identity is altered. This is because a chemical change transforms the substance into a new material, while a physical change only alters its form. Knowing whether the crust changes the original silver coin's nature can differentiate between the two.
To discern whether the black crust on the silver coins signifies a chemical change or a physical change, you could ask: 'Can the black crust be removed to reveal the original silver coin beneath, without altering the silver coin's composition?'
This question is crucial because the main difference between chemical and physical changes on whether the substance's identity is altered. In a chemical change, substances are transformed into entirely new materials with different properties. An example of this is iron rusting. On the contrary, a physical change, such as ice melting into water, does not change the substance's fundamental nature, only its form.
If the black crust on the silver coins is a result of oxidation (combines with oxygen), similar to that in a rusting process, this would indicate a chemical change. However, if the black crust is merely tarnishing that can be polished off to reveal the same silver beneath, this would be an example of a physical change. Thus, understanding whether the crust alters the fundamental nature of the silver is important to differentiate between a chemical change and a physical change.
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A single nucleotide is made up of the three parts known as phosphoric acid, deoxyribose and a nitrogenous base
The part of the nucleotide that determines the genetic information is the Nitrogenous base. There are four different types of nitrogenous bases: adenine (A), guanine (G), cytosine (C), and thymine (T).
The part of the nucleotide that provides the structure and stability of the molecule. The sugar in DNA is deoxyribose, while the sugar in RNA is ribose.
The Phosphate group is part of the nucleotide that provides energy and helps to link nucleotides together. It is also known as phosphoric acid.
Find out more on nucleotides at brainly.com/question/14067588
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off after 15 days
B) steel rusting
C) paper burning
D) wood decaying
A physical change changes the state on object is in, making the answer A) iron melting. Since it's melting, it's going from solid to liquid.
are renewable natural resources.
B.
are in very short supply for consumers.
C.
release carbon dioxide when they are burned.
D.
are clean fuels that contribute little to pollution.
answer- release carbon dioxide when burned
coal, oil, and natural gas release carbon dioxide when they are burned and definitely contribute to air pollution.
B. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
C. A physical change produces a new element, and a chemical change results in a bond breaking between atoms.
D. A chemical change results in a new element being formed, and a physical change results in a new compound being formed.
Answer:
A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
Physical properties:
Physical properties are those which have same composition. In other words, composition does not change, only state may be change like solid to liquid, liquid to gas, solid to liquid etc.
Example.
Water when freezes into ice, it is physical change, just state is change.
Chemical properties:
The chemical properties depend upon composition.
Example:
Formation of precipitates is an example of chemical change.