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Which sample of matter can be separated into different substances by physical means?
A mixture is a sample of matter that can be separated into different substances by physical means. This can include techniques such as filtration, distillation, or chromatography to isolate the individual components.
What is the characteristic of a pure substance?
The defining characteristic of a pure chemical substance is that any sample of it contains the same elements in the same mass proportions to one another.
Why is matter a pure substance?
Matter is a pure substance if it can only be separated by chemical means, NOT physical means. This could be a compound or an element. The opposite is a mixture which can be separated/broken into smaller parts by physical means.
What sample of matter can be separated into different substances by chemical means?
Anything larger than a single atom. Compounds -- that is, substances chemically made from more than one species of atom -- can be chemically separated into their elemental parts. H2O can be seperated by electricity into H2 and O2. 2(H2O) + charge --> 2H2+O2
Can pure substances be mixtures?
No, pure substances cannot be mixtures. A pure substance is made up of only one type of atom or molecule, with uniform properties throughout the sample. Mixtures, on the other hand, are composed of two or more different substances physically combined, each retaining its individual properties.
What are 3 facts of Pure Substances?
Pure substances have a uniform and consistent composition throughout, meaning they contain only one type of particle. They can be classified into two categories: elements, which cannot be broken down into simpler substances, and compounds, which consist of two or more elements chemically combined in fixed ratios. Additionally, pure substances have distinct physical and chemical properties, such as boiling and melting points, that remain unchanged regardless of the sample size.
Which sample of matter is single substance?
A sample of matter that is a single substance is called a pure substance. Pure substances have a uniform and definite composition, meaning they consist of only one type of particle. Examples include elements like gold or oxygen, and compounds like water or sodium chloride. In contrast, mixtures contain two or more different substances that can be physically separated.
What can be observed only when the substances in a sample of matter are changing into different substances?
chemical change
Can a sample of matter change its composition or state?
For chemical reactions, the elements in a sealed vessel will not change. But, reactions can take place that would tend to take the sample to a state of equilibrium. Or, with heating or cooling the physical state can be changed.Another type of reaction is nuclear decay, in which radioactive substances will spontaneously decay to other radioactive substances, or decay to non-radioactive substances, thus actually changing the elements present.
Is a mixture always a chemical combining of substances?
Any particular isolated sample of a mixture has a definite chemical composition, but the general idea of a mixture, even of the same materials, implies variability in possible chemical composition.
Briefly explainthe meaning of the phrase resolve a mixture of compounds?
Resolving a mixture of compounds refers to the separation or purification of different substances within a mixture. This process is often done using techniques like chromatography or distillation to isolate individual compounds based on their physical or chemical properties.
Is melting a sample of gold an example of a physical or chemical change?
Melting a sample of gold is an example of a physical change.
