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Does The Law of Definite Proportions state that substances combine in predictable proportions and that excess reactants remain unchanged?
Wiki User
∙ 12y ago
Yes, it is true; but today this law is not generally valid.
Wiki User
∙ 12y ago
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Laws of chemical conbination?
The laws of chemical combination are fundamental principles that govern the relationships between the quantities of reactants and products in a chemical reaction. The three main laws are the law of conservation of mass, the law of definite proportions, and the law of multiple proportions. The law of conservation of mass states that mass is conserved in a chemical reaction, meaning that the total mass of the reactants is equal to the total mass of the products. The law of definite proportions states that a compound always contains the same proportions of elements by mass. The law of multiple proportions states that when two elements combine to form multiple compounds, the mass ratios of the elements in the compounds are always in whole-number ratios.
What does a chemical equation have?
It contain the chemical formula of the specified compounds (reactants and final products), it contains the chemical proportions of a compound (coefficients).
What do you call the substances before a chemical reaction takes place?
The substances before a chemical reaction takes place are called reactants.
How much hydrogen will produce if you mix sulfuric acid with calcium metal?
It depends on how much of those reactants you use. You can predict the proportions, however, by looking at the balanced equation: Ca + H2SO4 --> CaSO4 + H2 The reactants and products are all in a 1:1 molar ratio. Some simple stoichiometry will get you actual mass/volume amounts.
What are the substances that are present before a chemical reaction starts?
The reactants exist before a reaction begins, and also the products are the result of the reaction of the reactants.
What does the law of constant proportions say about a reaction that has too much of one of the reactants?
The law of definite proportions says that a reaction that has too much of one of the reactants will eventually stop because it will run out of the other reactant(s). This is also referred to as the law of constant composition.
What tells reactants products physical state and proportions of each substance in a chemical reaction?
A chemical equation
Does a skeleton equation show the correct formulas of the reactants and products?
A skeleton equation has all the correct reactants and products but it does not have the coefficients that indicate the stoichiometric proportions.
The proportions of the reactants and products involved in a chemical reaction are shown by the what in the balanced equation describing the reaction?
mole ratio
Laws of chemical conbination?
The laws of chemical combination are fundamental principles that govern the relationships between the quantities of reactants and products in a chemical reaction. The three main laws are the law of conservation of mass, the law of definite proportions, and the law of multiple proportions. The law of conservation of mass states that mass is conserved in a chemical reaction, meaning that the total mass of the reactants is equal to the total mass of the products. The law of definite proportions states that a compound always contains the same proportions of elements by mass. The law of multiple proportions states that when two elements combine to form multiple compounds, the mass ratios of the elements in the compounds are always in whole-number ratios.
What does a chemical equation have?
It contain the chemical formula of the specified compounds (reactants and final products), it contains the chemical proportions of a compound (coefficients).
What are the basic assumptions in stoichiometry?
reactants completely change into products.no side reaction occurs.law of conservation of mass and law of definite proportions are obeyed.
Definition of a chemical reaction?
A combination, or synthesis, reaction, is one in which two simpler substances chemically combine to form a more complex substance. For example, the reaction between hydrogen and oxygen to form water is a combination (synthesis) reaction. 2H2 + O2 --> 2H2O
Why is there a need to balance equations?
Because the mass of the reactants must equal the mass of the products due to the Law of Conservation of Mass. By balancing the equation you show the correct proportions of chemicals.
What shows the relationship between the reactants and products in a chemical reaction?
the coefficients of a balanced reaction
What substances do you have at the beginning of a chemical reaction?
The substances you have at the beginning of a chemical reaction are the reactants or the reagents.
What is the starting substance in a chemical reaction is?
The substances you have at the beginning of a chemical reaction are called the reactants.
