Honors Chemistry Chapter 3 Already Graded A+
Law of Conservation of Mass:
️ The law that states that mass cannot be created or destroyed in ordinary chemical and physical
changes.
Law of Definite Proportions:
️ The law that states that a chemical compound always contains the same ...
✔️ The law that states that mass cannot be created or destroyed in ordinary chemical and physical
changes.
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.
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 wholenumber ratios to form chemical compounds.
5. In chemical reactions, atoms are combined, separated, or rearranged.
(Note: 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 CathodeRay Tube?:
✔️ 1. Cathode rays were deflected by a magnetic field in the same manner as a wire carrying an
electric current, which was known to have a negative charge.
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