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Chapters
2: Work and Energy
3: Current Electricity
▶ 4: Measurement of Matter
5: Acids, Bases and Salts
6: Classification of Plants
7: Energy Flow in an Ecosystem
8: Useful and Harmful Microbes
9: Environmental Management
10: Information Communication Technology (ICT)
11: Reflection of Light
12: Study of Sound
13: Carbon: An important element
14: Substances in Common Use
15: Life Processes in Living Organisms
16: Heredity and Variation
17: Introduction to Biotechnology
18: Observing Space: Telescopes
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Solutions for Chapter 4: Measurement of Matter
Below listed, you can find solutions for Chapter 4 of Maharashtra State Board Balbharati for Science and Technology [English] 9 Standard Maharashtra State Board.
Balbharati solutions for Science and Technology [English] 9 Standard Maharashtra State Board 4 Measurement of Matter Exercise [Page 57]
Give example.
Positive radicals
Give example.
Basic radicals
Give example.
Composite radicals
Give example.
Metals with variable valency
Give example.
Bivalent acidic radicals
Give example.
Trivalent basic radicals
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
Write the steps in deducing the chemical formulae of the following compound.
Sodium sulphate
Write the steps in deducing the chemical formulae of the following compound.
Potassium nitrate
Write the steps in deducing the chemical formulae of the following compound.
Ferric phosphate
Write the steps in deducing the chemical formulae of the following compound.
Calcium oxide
Write the steps in deducing the chemical formulae of the following compound.
Aluminium hydroxide
Write answers to the following questions and explain your answers.
Explain how the element sodium is monovalent.
M is a bivalent metal. Write down the steps to find the chemical formulae of its compounds formed with the radicals, sulphate and phosphate.
Explain the need for a reference atom for atomic mass. Give some information about two reference atoms.
What is meant by Unified Atomic Mass?
Explain with examples what is meant by a 'mole' of a substance.
Write the name of the following compound and deduce its molecular mass.
Na2SO4
Write the name of the following compound and deduce its molecular mass.
K2CO3
Write the name of the following compound and deduce its molecular mass.
CO2
Write the name of the following compound and deduce its molecular mass.
MgCl2
Write the name of the following compound and deduce its molecular mass.
NaOH
Write the name of the following compound and deduce its molecular mass.
AlPO4
Write the name of the following compound and deduce its molecular mass.
NaHCO3
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.
Deduce the number of molecules of the following compound in the given quantity.
32g oxygen
Deduce the number of molecules of the following compound in the given quantity.
90g water
Deduce the number of molecules of the following compound in the given quantity.
8.8g carbon dioxide
Deduce the number of molecules of the following compound in the given quantity.
7.1g chlorine
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
Sodium chloride
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
magnesium oxide
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
Calcium carbonate
Solutions for 4: Measurement of Matter
Balbharati solutions for Science and Technology [English] 9 Standard Maharashtra State Board chapter 4 - Measurement of Matter
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Concepts covered in Science and Technology [English] 9 Standard Maharashtra State Board chapter 4 Measurement of Matter are Law of Conservation of Matter (Law of Conservation of Mass), Law of Constant Proportions (Law of Definite Proportions), Molecular Mass, Laws of Chemical Combination, Atoms: Building Blocks of Matter, Mole Concept, Symbols Used to Represent Atoms of Different Elements, Variable Valency, Valency, Avogadro’s Number, Molecules of Elements and Compounds, Atomic Mass, Ions (Radicals) and Its Types, Chemical Formulae of Compounds.
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