Revision test
1. Differentiate between homogeneous and heterogeneous solution.
2. What is size range of colloidal solution?
3. Write down the formulae of
Sodium oxide
Aluminum chloride
Sodium sulphide
Magnesium hydroxide
4. Calculate molecular masses of-
Carbon dioxide
Water
Methanol
Ammonia
5. What is the mass of-
0.2 mole of oxygen atom
0.5 mole of water molecules?
6. Name subatomic particles of atom.
7. Explain Rutherford's model of atom.
Answers
Answer:
homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. ... Particle size distinguishes homogeneous solutions from other heterogeneous mixtures.
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Answer:
Ans 1-A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. ... Particle size distinguishes homogeneous solutions from other heterogeneous mixtures.
ans2-Colloidal particles are larger than simple molecules but small enough to remain suspended. Their range of diameters is between 1 and 1000 nm (10−5 to 10−7cm).
ans3- a)Na2O
b)AlCl3
c)Mg(OH)2.
ans4-We can calculate the mass of one molecule of carbon dioxide by adding together the masses of 1 atom of carbon and 2 atoms of oxygen. The molecular mass of a compound is the mass of one molecule of that compound. The molecular mass of carbon dioxide is 44.01am.
b)-Molar mass of atoms
Mass of one mole of water = 2 g/mol + 16 g/mol = 18 g/mol.
c)32.04 g/mol
d)Molar mass of atoms
Mass of one mole of water = 2 g/mol + 16 g/mol = 18 g/mol.
ans5-a)From here, the answer is simple. Just multiply 2 by 31.9988 g because there are two moles of oxygen. So, the answer is 63.9976 g
b)9 grams
Thus, the mass of 1 mole of water is 18 grams. Thus, the mass of 0.5 mole of water (H2O) is 9