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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.
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∙ 13y ago
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When substances form mixtures the substances always change their physical state?
The statement in the question is false. It is very common for two liquids to form a mixture that is also liquid, and, unless a chemical reaction occurs, a mixture of two gases always is also a gas.
What does not always contain the same percentages of the various substances?
A mixture
What substance can be separated into simpler substances only by chemical means?
A mixture There are four types of mixtures: Alloy - homogenous metalic solid Solution - homogenous mix of two or more substances (not all metals) Suspention - not evenly mixed and will separate if left alone Colloid - Sorry, I always forget what this one is
Which scientist showed that the total mass of the substances in a chemical reaction is always the same before and after the chemical reaction?
Antoine Lavoisier
What is shales chemical symbol?
It doesn't have one. Shale is a mixture and doesn't always have the same composition. Only elements have chemical symbols
Do the substances in a mixture be mixed in any proportion?
Substances in a mixture can be present in any amount. In a mixture, substances are only mixed physically and retain their chemical identity.
When substances form mixtures the substances always change their physical state?
The statement in the question is false. It is very common for two liquids to form a mixture that is also liquid, and, unless a chemical reaction occurs, a mixture of two gases always is also a gas.
A solution a substance or a mixture?
It is always a mixture of two substances: the solute and the solvent.
What does not always contain the same percentages of the various substances?
A mixture
When a chemical property is observed the identity of the substances?
Always :)
New substances are always formed when matter undergoes?
chemical change.
Is caffeine a heterogeneous or a homogeneous mixture?
Caffeine is a chemical compound, not a mixture.
What substance can be separated into simpler substances only by chemical means?
A mixture There are four types of mixtures: Alloy - homogenous metalic solid Solution - homogenous mix of two or more substances (not all metals) Suspention - not evenly mixed and will separate if left alone Colloid - Sorry, I always forget what this one is
New substances are always formed when matter undergoes what?
chemical change.
Unlike a mixture a compound has a chemical formula that is always the sametrue or false?
True.
Which scientist showed that the total mass of the substances in a chemical reaction is always the same before and after the chemical reaction?
Antoine Lavoisier
How do you handle hazardous chemical substances in science lab?
you have to handle chemicals with care and ALWAYS be careful.
