1. State the two laws of chemical combination.
2. What are the postulates of Dalton's atomic theory?
3. What is an atom?
Answers
Answer:
Law of Conservation of Mass. It states that matter can neither be created nor destroyed.
Law of Definite Proportions. It stated that a given compound always contains exactly the same proportion of elements by weight. ...
Law of Multiple Proportions. ...
Gay Lussac's Law of Gaseous Volumes. ...
Avogadro Law.
2. The matter is made up of indivisible particles known as atoms. The properties of all the atoms of a given element are the same including mass. ... Atoms of different elements combine in fixed ratios to form compounds. Atoms are neither created nor destroyed.
3. An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers.
Components: Electrons and a compact nucleus of protons and neutrons
Electric charge: zero (neutral), or ion charge
Mass range: 1.67×10−27 to 4.52×10−25 kg
Diameter range: 62 pm (He) to 520 pm (Cs) (data page)
Laws of chemical combining
There are five basic laws of chemical combination that govern the chemical combinations of elements:
Law of Conservation of Mass. In simple terms, this law states that matter can neither be created nor destroyed. ...
Law of Definite Proportions. ...
Law of Multiple Proportions. ...
Gay Lussac's Law of Gaseous Volumes. ...
Avogadro's Law.
Dalton's atomic theory
Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass
Atom
atom a fundamental piece of matter. ... An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.
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