Honors Chemistry Chapter 3 | Comprehensive Questions and Answers Latest Updated
2024/2025 With 100% Verified Solutions
What is the Law of Conservation of Mass? - The law that states that mass cannot be created or
destroyed in ordinary chemical and physical changes.
What is the Law of Definite Proportions? - The law that states that a chemical compound always
contains the same elements in exactly the same proportions by weight or mass.
What is the Law of Multiple Proportions? - The law that states that when two elements combine to form
two or more compounds, the mass of one element that combines with a given mass of the other is in
the ratio of small whole numbers.
Who came up with the atomic theories in 1808 and what were they? - John Dalton
1. All matter is composed of extremely small particles called atoms.
2. Atoms of an element are identical in size, mass, and other properties; atoms of different elements
differ in size, mass, and other properties.
3. Atoms cannot be subdivided, created, or destroyed.
4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
5. In chemical reactions, atoms are combined, separated, or rearranged
(These are not all correct)
What is the modern definition of an atom? - The smallest unit of an element that maintains the chemical
properties of that element.
What observations were made when current was passed through a Cathode-Ray Tube? - 1. Cathode rays
were deflected by a magnetic field in the same manner as a wire carrying electric current, which was
known to have a negative charge.
2. The rays were deflected away from a negatively charged object.
These observations led to the hypothesis that the particles that compose cathode rays are negatively
charged.
It was also concluded that electrons are present in atoms of all elements.
