Matter, Measurement, and Problem Solving Principles of Chemistry: A Molecular Approach 2e (Tro) Chapter 1 Matter, Measurement, and Problem Solving 1) Molecules can be described as A) a mixture of two or more pure substances. B) a mixture of two or more elements that has a specific ratio between components. …
أكمل القراءة »Atoms
ATOMS Law of constant composition: This states that “A chemical compound (if pure) always contains the same elements combined together in the same proportion by mass regardless of bow the compound is prepared or from where it is obtained”. Law of conservation of mass: This is defined as “In every …
أكمل القراءة »ملخص الفصل الثالث :العلاقات الكمية الكيميائية من كتاب الكيمياء للعالم زومدال Chapter 3 notes: Stoichiometry , AP chemistry Zumdahl
ملخص الفصل الثالث :العلاقات الكمية الكيميائية من كتاب الكيمياء للعالم زومدال Chapter 2 notes: Stoichiometry , AP chemistry Zumdahl إذا كنت تبحث عن باقي الفصول فالرجاء الضغط على الروابط الآتية : الفصل الأول : ملخص الفصل الأول :أساسيات الكيمياء للعالم زومدال Chapter 1 chemistry foundation Notes Zumdahl AP الفصل الثاني :ملخص …
أكمل القراءة »isotopes and isobars
Isotopes: Isotopes are atoms of the same element having the same atomic number but different atomic masses. Note that the difference in the masses of isotopes is due to the different number of neutrons in their nuclei. Isotopes have the same chemical properties . because they have the same number of …
أكمل القراءة »Atomic Number and Mass Number
Atomic Number: Atomic number of an element is equal to the number of protons present in the nucleus of an element. Atomic number = number of protons in one atom of element. Since the atom as a whole is neutral therefore atomic number is the same as the number of …
أكمل القراءة »Atomic Theory
Dalton’s Model of the atom. It is the basis of our understanding of the nature of matter. The following four statements comprise Dalton’s Model: a – All matter is made up of extremely tiny. particles. called atoms. b- Atoms are indivisible. c – Atoms of the same element are alike. …
أكمل القراءة »العدد الذري
العدد الذري atomic Number : و يعرف أيضا باسم العدد البروتوني و يرمز له بالرمز Z . و هو عدد البروتونات في النواة . عدد البروتونات يساوي دائما عدد الإلكترونات التي تدور حول النواة .
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