- Classify each of the following as a pure substance or a mixture- if.docx
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. Classify each of the following as a pure substance or a mixture; if it is a mixture, state whether it or homogeneous: (a) concrete, (b) tomato juice, (c) marble, (d) seawater, and (e) iron. 2. Sugge st a way to determine whether a colorless liquid is pure water or a salt solution without tasting it. 3. What distinguishes a mixture from an impure substance? 4. Define the process of sublimation. 5. How do decantation and filtration differ? Which should be faster? 6. Why should you never weigh a hot object? Solution 1. Only iron is pure substance, rest all are homogeneous mixture . 2 .Pure water will be clear and and salt solution will have some colloidal particles suspended in water and these can be seen with naked eye . 3.A mixture is made while impure substance is self made . Mixture is a combination of two different substance for any purpose but impure substance have undesirable foreign substance in a pure substance . 4.Sublimatio ; when upon strong heating any solid directly changes into the gas without undergoing liquid phase , is called sublimation . .
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Important questions CLASS 9 IS MATTER AROUND US PURE
This document discusses questions related to pure substances and mixtures. It provides answers to questions about classifying mixtures as homogeneous or heterogeneous, identifying solutions, distinguishing between physical and chemical changes, and techniques for separating mixtures like distillation, crystallization, chromatography, and centrifugation. Key topics covered include properties of pure substances and mixtures, types of mixtures, solubility and saturation, and separation methods for mixtures and solutions.
Is Matter Around Us Pure - exercises
This document for Class 9 (CBSE), Chapter 2 - Is Matter Around Us Pure, includes MCQs, Match the following, True or False, Fill in the blanks and Very-Short-Answer Questions. Hope you like it.
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1. A polar section of a molecule, which is  ---Select--- to water, is called hydrophilic (literally, \"water loving\"), and a(n)___part of the molecule, which is not expected to be attracted to water, is called hydrophobic (\"water fearing\").
2. Would the following combinations be expected to be soluble or insoluble?
(a) hydrocarbon solute and hexane
(b) nonpolar solute and nonpolar solvent
(c) ionic solute and hexane
3. The solubilities in water of several substances are listed below. Classify each of these substances as soluble, insoluble, or moderately soluble, based on the criteria presented in the text.
(a) Camphor, C 10 H 16 O (a topical anti-infective): 0.1 g per 100 mL H 2 O at 25°C
(b) Cobalt(II) fluoride, CoF 2 (a catalyst in organic reactions): 1.5 g per 100 g H 2 O at 25°C
4. The primary components of vinegar are acetic acid and water, both of which are composed of polar molecules with hydrogen bonds that link them. These two liquids will mix in any proportion. Explain why acetic acid and water are miscible.
5. What does it mean to say a solution is saturated? Describe the changes that take place at the particle level in a saturated solution of sodium chloride that contains an excess of solid NaCl. Is the NaCl still dissolving?
Solution
1) attracted, non-polar
2) Nonpolar solute dissolves in nonpolar solvent and polar solute dissolves in polar solvent.
a)soluble (both being nonpolar)
b)soluble
c)insoluble (as ionic solutes are polar)
3) solubility: if a solute has a solubility of 0.1g/mL or less, it is considered insoluble.
if a solute has a solubility of 1.0g/mL or more, it is considered soluble.
Any value between these 2 are considered sparingly soluble.
Thus.
a) camphor is insoluble in water
b)CoF 2 is soluble in water.
4) due to their polar nature and presence of inter molecular H-bonding.
5)The excess NaCl added to saturated solution acts as seeds for NaCl crystal growth, as the solution tries to restore its equilibrium.
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C08 mixtures and separations
This document discusses different types of mixtures and separation techniques. It begins by defining a pure substance as a single substance that exists as crystals, while mixtures are impure substances made of two or more substances mixed together. It then discusses homogeneous mixtures like solutions and heterogeneous mixtures like suspensions and colloids. The document goes on to describe various separation techniques including filtration, evaporation, crystallization, distillation, chromatography and provides examples of how each technique can be used to separate different mixtures.
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The document discusses various topics related to mixtures and separations:
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Important questions CLASS 9 IS MATTER AROUND US PURE
This document discusses questions related to pure substances and mixtures. It provides answers to questions about classifying mixtures as homogeneous or heterogeneous, identifying solutions, distinguishing between physical and chemical changes, and techniques for separating mixtures like distillation, crystallization, chromatography, and centrifugation. Key topics covered include properties of pure substances and mixtures, types of mixtures, solubility and saturation, and separation methods for mixtures and solutions.
Is Matter Around Us Pure - exercises
This document for Class 9 (CBSE), Chapter 2 - Is Matter Around Us Pure, includes MCQs, Match the following, True or False, Fill in the blanks and Very-Short-Answer Questions. Hope you like it.
1- A polar section of a molecule- which is---Select--- to water- is ca.docx
1. A polar section of a molecule, which is  ---Select--- to water, is called hydrophilic (literally, \"water loving\"), and a(n)___part of the molecule, which is not expected to be attracted to water, is called hydrophobic (\"water fearing\").
2. Would the following combinations be expected to be soluble or insoluble?
(a) hydrocarbon solute and hexane
(b) nonpolar solute and nonpolar solvent
(c) ionic solute and hexane
3. The solubilities in water of several substances are listed below. Classify each of these substances as soluble, insoluble, or moderately soluble, based on the criteria presented in the text.
(a) Camphor, C 10 H 16 O (a topical anti-infective): 0.1 g per 100 mL H 2 O at 25°C
(b) Cobalt(II) fluoride, CoF 2 (a catalyst in organic reactions): 1.5 g per 100 g H 2 O at 25°C
4. The primary components of vinegar are acetic acid and water, both of which are composed of polar molecules with hydrogen bonds that link them. These two liquids will mix in any proportion. Explain why acetic acid and water are miscible.
5. What does it mean to say a solution is saturated? Describe the changes that take place at the particle level in a saturated solution of sodium chloride that contains an excess of solid NaCl. Is the NaCl still dissolving?
Solution
1) attracted, non-polar
2) Nonpolar solute dissolves in nonpolar solvent and polar solute dissolves in polar solvent.
a)soluble (both being nonpolar)
b)soluble
c)insoluble (as ionic solutes are polar)
3) solubility: if a solute has a solubility of 0.1g/mL or less, it is considered insoluble.
if a solute has a solubility of 1.0g/mL or more, it is considered soluble.
Any value between these 2 are considered sparingly soluble.
Thus.
a) camphor is insoluble in water
b)CoF 2 is soluble in water.
4) due to their polar nature and presence of inter molecular H-bonding.
5)The excess NaCl added to saturated solution acts as seeds for NaCl crystal growth, as the solution tries to restore its equilibrium.
.
Potassium Chromate Lab
The lab experiment involved purifying benzoic acid through recrystallization and then using calorimetry to determine its enthalpy of solution. In the first part, 50mg of benzoic acid was dissolved in hot water and filtered. Impurities were removed through boiling and activated charcoal. The solution was cooled and crystals were formed, separated from water using ethanol, and dried. In the second part, the enthalpy of solution was determined using a calorimeter by dissolving the purified benzoic acid crystals in water and measuring the temperature change.
Chapter5waterandsolution 121120021919-phpapp01
Water is the most abundant substance on Earth and exists in three states: solid, liquid, and gas. It has unique physical characteristics like being colorless, odorless, and tasteless as a liquid. Its freezing point is 0°C and boiling point is 100°C. Water is made of hydrogen and oxygen atoms and is represented by the formula H2O. Natural sources of water include oceans, lakes, rivers, and groundwater but require purification for human use and consumption. Common purification methods include filtration, boiling, and chlorination which remove various impurities while distillation produces the purest form of water.
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The document discusses the properties of various substances including gold, pyrite, water, chloroform, ethanol, propane, and table salt. It provides information on their melting points, boiling points, and states at room temperature. It then discusses the physical and chemical properties of gold, noting that it is a yellowish metal that is an excellent conductor of heat and electricity with a high density and melting/boiling points but does not react with water.
C08 mixtures and separations
This document discusses different types of mixtures and separation techniques. It begins by defining a pure substance as a single substance that exists as crystals, while mixtures are impure substances made of two or more substances mixed together. It then discusses homogeneous mixtures like solutions and heterogeneous mixtures like suspensions and colloids. The document goes on to describe various separation techniques including filtration, evaporation, crystallization, distillation, chromatography and provides examples of how each technique can be used to separate different mixtures.
C08 mixtures and separations
The document discusses various topics related to mixtures and separations:
- It identifies different types of solutions, suspensions, and colloids.
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- It describes the extraction of sucrose from sugar cane.
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Solution
A phase-transfer catalyst enables the reaction in a heterogeneous system between general organic compounds soluble in organic solvents and compounds soluble in water such as inorganic salts. The reaction can be accomplished in a biphasic system of an inexpensive nonpolar aprotic solvent and water without using DMSO or DMF which are high-polar solvents. A phase-transfer catalyst is soluble in both solvents, and it carries anions of inorganic salts into organic solvents and returns them into the water phase. Reactions usually progress under mild conditions with easy work-up procedures. For this reason, they are also used industrially. Typical phase-transfer catalysts are quaternary ammonium salts, crown ethers, and phosphonium compounds etc.
Phase-transfer catalysis (PTC) has been widely used for the synthesis of organic compounds for more than three decades. Phase transfer catalysis (PTC) uses catalytic amounts of phase transfer agents which facilitate the interphase transfer of species, making reactions between reagents in two immiscible phases possible. PTC is used widely in the synthesis of various organic chemicals in both liquid-liquid and solid-liquid systems.
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(Multiple choice) Which one of the following statements is true- Expla.docx
(Multiple choice)
Which one of the following statements is true? Explain why they are T/F.
(a) In metals, dislocations provide easy pathways for conducting electrons.
(b) When a hole is created by thermal excitation of an electron across the band gap (1.1 eV) in
silicon (atomic number 14), it has the same charge as a hole created by thermal excitation
of an electron across the band gap (0.67 eV) in germanium (atomic number 32).
(c) When a reverse-bias potential is applied across a p-n junction in doped Si, the flow of
charge carrier across the junction will be insignificantly small.
(d) In any given intrinsic semiconductor, the mobility of holes in the conduction band is lower
than the mobility of electrons in the conduction band.
(e) The addition of Ge to Si produces an extrinsic semiconductor.
Solution
(d) is correct .
qE= E-Eg (in eV) so, lesser Eg gives more charge.
(e) is false because Ge (+4 valency) will retain nature of doping in Si.
(c) it would be significantly small i.e.,much lesser.
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Required
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Solution
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What is continuous linked settlement and how does it operate?
Continuous Linked Settlement
Continuous Linked Settlement is a process by which a number of the world\'s largest banks manage settlement of foreign exchange amongst themselves, their customers and other third-parties. It is an industry initiative to eliminate the settlement risk in foreign exchange transactions. This is achieved by using a \'payment versus payment\' method, which provides a simultaneous exchange of currency values through Continuous Linked Settlement Bank International (CLS)
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Solution
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(b) Ionization energy generally increases from left to right across th.docx
(b) Ionization energy generally increases from left to right across the second period element, but boron, which is to the right of beryllium, has a lower ionization energy than beryllium. Explain. Bor on has a lower Ionization energy Beryllium than be cause He D Øshell only contains one ele ce von which makes it less stable the Beryllium which has a tulis oy bital. Muh s
Solution
Generally in the periods from left to right Ionisation Energy increases... Because decrease in atomic radii.
But Boron having less Ionisation Energy compare to Beryllium it\'s neighbour element,
reason:
BORON electronic configuration 1s2 2s2 2p1
Beryllium electronic configuration 1s2 2s2
Beryllium contains completely filled 2s orbital, so it gives extra stability. That is why it needs more energy to remove the electron.
Where as Boron has 2p1 electron in its valence shell it can be easily removed, so it has low Ionisation Energy
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Solution
The concept of corporate hierarchies and the concept of systems is simpilar to eachother.
The arrangement of individuals within a corporation according to power, status and job function. In a public company, usually the board of directors will be at the top, followed by the CEO, who may also be the chairman of the board of directors as well as the president. Below the CEO will be other C-level executives, such as the CFO, CIO and COO, followed by upper management (vice-presidents/managers/directors), then the employees in each department who are further broken down into levels of experience and authority.
Similarly,
A system is a set of interacting or interdependent component parts forming a complex/intricate whole. [1] Every system is delineated by its spatial and temporal boundaries, surrounded and influenced by its environment, described by its structure and purpose and expressed in its functioning.
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Solution
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We can access or browse the web pages with the help of web browsers.
Web browsers examples: Mozilla, chrome
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Protocals:
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Nominal GDP in billions
GDP Deflator
2010
$12,000
100
2011
13,000
104
2012
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105
2013
14,800
110
Solution
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Solution
What is continuous linked settlement and how does it operate?
Continuous Linked Settlement
Continuous Linked Settlement is a process by which a number of the world\'s largest banks manage settlement of foreign exchange amongst themselves, their customers and other third-parties. It is an industry initiative to eliminate the settlement risk in foreign exchange transactions. This is achieved by using a \'payment versus payment\' method, which provides a simultaneous exchange of currency values through Continuous Linked Settlement Bank International (CLS)
How is CLS managed?
Settlement Members have direct links to CLS to input deals on their own and their customers\' behalf. They effect settlement on the due dates through accounts held at the CLS Bank. User Members have the same direct access, but use a Settlement Member to handle their settlement on the due dates. Third Parties have no direct links to CLS, and their trades must be sent to CLS via a Settlement or User Member. Most banks (as well as major corporates with their own FX departments), that wish to use CLS, do so as Third Parties)
How does Continuous Linked Settlement work?
When a foreign exchange deal is struck between banks, each counterparty transmits the details to CLS Bank, where they are matched and held until the settlement date. At the start of day, each Settlement Member
.
- What is a right-to-work state- What are the advantages or disadvanta.docx
. What is a right-to-work state? What are the advantages or disadvantages of doing business in a right-to-work state?
Solution
A Right to Work law secures the right of employees to decide for themselves whether or not to join or financially support a union. However, employees who work in the railway or airline industries are not protected by a Right to Work law, and employees who work on a federal enclave may not be. Moreover, a Right to Work law does not prohibit limitations on when a dues deduction authorization card can be revoked.
The Advantages of the Right to Work
Right-to-work laws prevent union organizations from monopolizing work opportunities. An outgrowth of the Taft-Hartley Act of 1947, right-to-work laws prohibit employers from creating exclusive relationships with labor unions. Right-to-work laws guarantee that nonunion employers and nonunion workers can bid on jobs that would otherwise be restricted for union labor
The Disadvantages of Right to Work States
Right-to-work states prohibit unions and employers from forcing employees to join a union or pay union dues as a condition of employment. These states also prevent denial of employment to non-union members or requiring a fee for the right to work. Nearly half of all states are \"right-to-work\" states. Advocates of right-to-work laws claim stronger economic growth indicators, such as lower unemployment rates, interstate migration and higher gross domestic product (GDP) growth. However, right-to-work can potentially weaken collective bargaining, inhibit worker wage growth and allow for employee termination without just cause
.
(b) Ionization energy generally increases from left to right across th.docx
(b) Ionization energy generally increases from left to right across the second period element, but boron, which is to the right of beryllium, has a lower ionization energy than beryllium. Explain. Bor on has a lower Ionization energy Beryllium than be cause He D Øshell only contains one ele ce von which makes it less stable the Beryllium which has a tulis oy bital. Muh s
Solution
Generally in the periods from left to right Ionisation Energy increases... Because decrease in atomic radii.
But Boron having less Ionisation Energy compare to Beryllium it\'s neighbour element,
reason:
BORON electronic configuration 1s2 2s2 2p1
Beryllium electronic configuration 1s2 2s2
Beryllium contains completely filled 2s orbital, so it gives extra stability. That is why it needs more energy to remove the electron.
Where as Boron has 2p1 electron in its valence shell it can be easily removed, so it has low Ionisation Energy
.
- How are corporate hierarchies related to the systems concept-Solutio.docx
- How are corporate hierarchies related to the systems concept?
Solution
The concept of corporate hierarchies and the concept of systems is simpilar to eachother.
The arrangement of individuals within a corporation according to power, status and job function. In a public company, usually the board of directors will be at the top, followed by the CEO, who may also be the chairman of the board of directors as well as the president. Below the CEO will be other C-level executives, such as the CFO, CIO and COO, followed by upper management (vice-presidents/managers/directors), then the employees in each department who are further broken down into levels of experience and authority.
Similarly,
A system is a set of interacting or interdependent component parts forming a complex/intricate whole. [1] Every system is delineated by its spatial and temporal boundaries, surrounded and influenced by its environment, described by its structure and purpose and expressed in its functioning.
The term system may also refer to a set of rules that governs structure or behavior. Alternatively, and usually in the context of complex social systems, the term is used to describe the set of rules that govern structure or behavior.
.
- Describe in one or two paragraphs what is Web (8-10 lines) Your desc.docx
. Describe in one or two paragraphs what is Web (8-10 lines) Your description should include, definition, evolution, starting history, protocols and creation of web pages, browsing, searching, managing organization, future of the web
Solution
Web is basically a system of Internet servers that support formatted documents. HTML (HyperText Markup Language) is used to format them. It consists of videos,audio and graphics.
We can access or browse the web pages with the help of web browsers.
Web browsers examples: Mozilla, chrome
Evolution of web :
On the thirtieth of April 1993 The European Council for Nuclear Research (CERN) released the source code of WorldWideWeb into the public domain, so anyone could use or build upon the software without charge.
Marc Andreessen left NCSA and together with Jim Clark founded Mosaic Communications, later renamed to Netscape Communications Corporation, and started work on what was to become Netscape Navigator.
Version 1.0 of the software was released in December 1994.
In August 1995 Spyglass Inc. licensed their Mosaic technology to Microsoft to form the basis of Internet Explorer and the version 1.0 of internet explorer was released.
Protocals:
TCP/IP : The Internet protocol suite (TCP/IP) was introduced as the standard networking protocol on the ARPANET in 1982.
Http : Development of HTTP was initiated by Tim Berners-Lee at CERN in 1989. The first definition of HTTP/1.1 occurred in RFC 2068 in 1997.Http/2 was standardized into 2015.
.
- Below are nominal GDP and GDP deflators for four years- Calculate re.docx
.  Below are nominal GDP and GDP deflators for four years. Calculate real GDP in each year:
Year
Nominal GDP in billions
GDP Deflator
2010
$12,000
100
2011
13,000
104
2012
14,490
105
2013
14,800
110
Solution
Year Nominal GDP Index Real GDP=Nominal GDP*100/Index(Base Year 2010) 2010 Â Â Â Â Â Â Â Â $12,000 100 12000 2011 Â Â Â Â Â Â Â Â 13,000 104 12500 2012 Â Â Â Â Â Â Â Â 14,490 105 13800 2013 Â Â Â Â Â Â Â Â 14,800 110 13454.55
.
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