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State the law of definite proportions?
The law of definite proportions states that all chemical compounds have constant proportions of their components.
Is dinitrogen monoxide a pure substance?
No, dinitrogen monoxide, or nitrous oxide, is a compound with the molecular formula N2O. Compounds are pure substances, and each compound has its own unique formula of elements that are chemically bonded, which means that it has a definite composition. Mixtures have no definite composition, and are not chemically bonded.
What is the law that states that a chemical compound always contains the same elements in exactly the same proportions by w eight and mass?
Law of definite proportion, sometimes also called the law of constant composition.
Pure substance vs mixture?
A pure substance is something like just water (H2O). A homogeneous mixture is a solution with multiple compounds. These mostly contain water, but not always. An example of a homogeneous mixture is H2O+NaCl or NaCl (aq).
What is the homogeneous material with with a variable composition?
No. A pure substances has a definite and constant composition.
Is the law of definite composition applicable to compounds only?
This law is not valid for all chemical compounds (ex. nonstoichiometric compounds).
Do compounds have variable composition?
No. Compounds have a definite composition, therefore they are pure substances. For example, water always has the formula H2O, sodium chloride (common table salt) always has the formula NaCl, and glucose (blood sugar) always has the formula C6H12O6.
What you mean by nonstoichiometry?
The chemical composition of nonstoichiometric compounds do not respect the law of definite proportions.
Is it true that a chemical has a definite composition?
Yes, after the Law of definite proportions; but now it is clear that this law is not applicable to all known chemical compounds.
The scientific statement that says that compounds always have exactly the same composition by mass is?
Law of definite proportions See also the link below.
Why are elements and compounds considered as substances?
because if the substances is bonded to another substance its a compound
What has a definite composition?
Solids
Do solutions have a definite composition?
Definite proportions, not indefinite proportions. What it says is that the composition of a compound is the same regardless of its state. For instance: Water is 11.1% hydrogen and 88.9% oxygen by mass. If I were to freeze water into ice, its composition would be 11.1% hydrogen and 88.9% oxygen by mass. If I were to vaporize the water into steam, its composition would be 11.1% hydrogen and 88.9% oxygen by mass. If I were to take ice, melt it, use an electrical current to electrolyze it into hydrogen gas and oxygen gas, burn them together to form water, flash freeze the resulting water to a temperature of -200 oC, it would still have a composition that is 11.1% hydrogen and 88.9% oxygen by mass. That is what the law of definite proportions tells you.
Which material has definite properties and definite chemical composition?
Minerals have a definite chemical composition, are solid, are inorganic, are naturally occurring, and have a crystalline structure.
What do you call a material with definite properties and definite chemical composition?
Atom
What is fixed composition?
Today the laws of definite proportions and multiple proportions, applied to chemical compounds, are considered as not genarally valid.Many mixtures (not all !) have a fixed composition depending on the specific application and recipe.
State the law of definite proportions?
The law of definite proportions states that all chemical compounds have constant proportions of their components.
