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elements
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∙ 14y ago
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What is composed of atoms in a fixed proportions?
Molecule.
Composed of atoms in fixed proportions?
compounds
Dalton's fourth postulate states that atoms combine?
A. In fixed proportions its really the only one that makes sence, You shouldn't need to look this one up. :)
What is composed of atoms in fixed proportions?
the rate of energy when used to move your body the rate of energy when used to move your body
How are compounds diffident from mixtures?
Compounds are composed of atoms of different elements chemically bonded in definite proportions. The components of mixtures are not chemically combined and they do not have definite proportions.
Why elements and compounds are pure substances?
Elements and compounds are pure substances because they both have fixed compositions or uniformed compositions.
Are the proportions of a compound fixed or not fixed?
Fixed.
What is any material that is made of two or more substances?
a compound no,it is a "mixture". a specific "compound" must be composed of different kinds of chemically combined (electronically bonded)atoms in fixed proportions. e.g. Methane (CH4) is a different compound than Ethane (C2H6)
Are the proportions of a mixture fixed?
No.
How can the existence of atoms help to explain the law of definite proportions?
The existence of atoms explains the law of definite proportions by suggesting that chemical substances are made up of atoms that combine in fixed ratios. Each atom has a specific mass and combining these atoms in fixed proportions leads to compounds with consistent ratios of elements. This consistency supports the law of definite proportions, which states that a compound will always contain the same elements in the same ratio by mass.
What were John Dalton's hypotheses about atoms?
1. Atoms are impenetrable and aren't destructible. All material is made up of very, very small atoms. 2. All atoms of an element have the same mass and the same properties. 3. Mixtures are made by a fusion of 2+ unlike classifications of atoms. 4. A chemical reaction is a displacement of atoms.
How many atoms is a molecule composed of?
That varies with the substance. H2O is composed of 3 atoms. C6H12O6 is composed of 24 atoms.
