9th Std - science- chapter 4 measurement of matter Question answer| Exercise std 9 science chapter4
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9th Std sci ch 4 measurement of matter Question answer
Exercise std 9 sci ch4 measurement of matter
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9th Std - science- chapter 4 measurement of matter Question answer| Exercise std 9 science chapter4
1. Give examples.
Exercises Co
a. Positive radicals
b. Basic radicals
c. Composite radicals
d. Metals with variable valency
e. Bivalent acidic radicals
f. Trivalent basic radicals
2. Write symbols of the following
elements and the radicals obtained
from them, and indicate the charge
on the radicals.
Mercury, potassium, nitrogen, copper,
sulphur, carbon, chlorine, oxygen
3. Write the steps in deducing the
chemical formulae of the following
compounds.
Sodium sulphate, potassium nitrate,
ferric phosphate, calcium oxide,
aluminium hydroxide
4. Write answers to the following
questions and explain your answers.
a. Explain how the element sodium is
monovalent.
b. M is a bivalent metal. Write down
the steps to find the chemical
formulae of its compounds formed
with the radicals, sulphate and
phosphate
c. Explain the need for a reference
atom for atomic mass. Give some
information about two reference
atoms.
d. What is meant by Unified Atomic
Mass.'
e. Explain with examples what is
meant by a 'mole' of a substance.
57
5. Write the names of the following
compounds and deduce their
molecular masses.
Na SO, K,CO, CO,, MgCl, NaOH,
AIPO, NaHCO,
6. Two samples 'm' and 'n' of slaked
lime were obtained from two
different reactions. The details
about their composition are as
follows:
'sample m' mass: 7g
Mass of constituent oxygen : 2g
Mass of constituent calcium : 5g
'sample n' mass: 1.4g
Mass of constituent oxygen : 0.4g
Mass of constituent calcium: 1.0g
Which law of chemical combination
does this prove? Explain.
7. Deduce the number of molecules of
the following compounds in the given
quantities.
8.
32g oxygen, 90g water, 8.8g carbon di
oxide, 7.1g chlorine.
If 0.2 mol of the following substances
are required how many grams of
those substances should be taken?
Sodium chloride, magnesium oxide,
calcium carbonate
Project:
Prepare models of various radicals
using cardboard, small circular
magnets and araldite. From these
make molecules of various
compounds.
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