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 p...
Honors Chemistry Chapter 3 with comprehensive Questions and
Answers
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.
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