1, According to the law of definite proportions, a, the mass ratio of the elements in a pure compound is always the same. b, if two same elements react to form two different compounds, their mass ratio stays the same for both compounds c, samples that have the same mass ratio are always the same substance d,the mass of the products is definitely the same as the mass of the reactants e, when two elements react they always form one definite compound
1, According to the law of definite proportions, a, the mass ratio of the elements in a pure compound is always the same. b, if two same elements react to form two different compounds, their mass ratio stays the same for both compounds c, samples that have the same mass ratio are always the same substance d,the mass of the products is definitely the same as the mass of the reactants e, when two elements react they always form one definite compound
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter2: Atoms, Molecules, And Ions
Section: Chapter Questions
Problem 3QAP: Two basic laws of chemistry are the law of conservation of mass and the law of constant composition....
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1, According to the law of definite proportions,
a, the mass ratio of the elements in a pure compound is always the same.
b, if two same elements react to form two different compounds, their mass ratio stays the same for both compounds
c, samples that have the same mass ratio are always the same substance
d,the mass of the products is definitely the same as the mass of the reactants
e, when two elements react they always form one definite compound
2, Which answer can be used to illustrate the law of multiple proportions?
a, CO2, H2CO3
b, CH4, CO2
c, HCl, Cl2
d, NaF, NaBr
e, SO, SO2
3, Which of the following was not postulated by Dalton?
a, Atoms of one element differ in properties from atoms of all other elements.
b, Atoms can be decomposed into smaller particles protons, neutrons, and electrons.
c, An atom is the smallest unit of an element that can participate in a chemical change.
d, Atoms are neither created nor destroyed during a chemical change, but are instead rearranged
4, Cathode ray experiments permitted Thomson to calculate:
a, mass-to-charge ratio of the particles composing the cathode ray
b, the mass of the atom
c, the charge of the electron
d, the mass of the electron
5,if two atoms have the same number of protons, but the different number of neutrons, they have the same:
a, chemical properties
b, atomic mass
c, mass number
d, physical properties
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