Question

Science
1. State the laws of chemical combination.
2. Explain Dalton's theory.
3. Write the formula of the following:
(a) sodium hydroxide
(b) calcium chloride
(c) zinc oxide
(d) potassium hydroxide
4. Define mole.
5. What is ion?



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Answer 1

1laws of chemical

Law of Conservation of Mass.

Law of Definite Proportions.

2Dalton atomic

All matter is comprised of tiny, definite particles called atoms.

Atoms are indivisible and indestructible.

All atoms of a particular element share identical properties, including weight.

Atoms of different elements contain different mass.

4The mole is the unit of measurement for amount of substance in the International System of Units. It is defined as exactly 6.02214076×10²³ particles, which may be atoms, molecules, ions, or electrons.

5An ion is a particle, atom or molecule with a net electrical charge. The charge of the electron is considered negative by convention. The negative charge of an ion is equal and opposite to charged proton considered positive by convention

Answer 2

Answer:

1.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.

2.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.

Dalton’s atomic theory also stated that all compounds were composed of combinations of these atoms in defined ratios

Dalton also postulated that chemical reactions resulted in the rearrangement of the reacting atoms.

3.

NaOH

CaCl2

ZnO

KOH

4.mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

5.An ion is a positively or negatively charged atom or group or atom. For Ex:Sodium ion,Magnesium ion,magnesium ion,chloride ion,oxide ion etc. There are two types of ions: 1)Cation:A positively charged ion is known as cation. A cation is formed by loss of one or more electrons by an atom