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Cbse Class 8 Chemistry Sample Paper Term 2 Model 1 - http://cbse.edurite.com/cbse-science/cbse-class-8-science.html
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travel agent
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Here are the answers to the practice questions:
1. Displacement reaction
2. (g) indicates the substance is in gaseous state
3. By storing in air tight containers to prevent reaction with oxygen
4. CO2 dissolves in water to form carbonic acid which reacts with calcium hydroxide to form calcium carbonate, making the solution milky
5. Nitrogen
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7. Photodecomposition of hydrogen chloride to form hydrogen and chlorine
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2. Short answers are provided for questions asking about bleaching powder preparation, disproportionation reactions, iodized salt, uses of halogens, noble gas properties and more.
3. Longer answers discuss similarities and differences of fluorine, oxidizing properties of halogens, reactions of chlorine with sodium hydroxide, and industrial bleaching powder manufacture.
Intro to reactions
I. This document introduces chemical reactions and their key components:
II. A chemical reaction involves the rearrangement of atoms and conserves mass. Signs of a reaction include heat, gas, precipitate, or color changes.
III. Chemical equations are used to represent reactions, balancing the reactants and products. They use symbols to show quantities, identities, and states of substances involved.
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FellowBuddy.com is a platform which has been setup with a simple vision, keeping in mind the dynamic requirements of students.
Our Vision & Mission - Simplifying Students Life
Our Belief - “The great breakthrough in your life comes when you realize it, that you can learn anything you need to learn; to accomplish any goal that you have set for yourself. This means there are no limits on what you can be, have or do.”
Like Us - https://www.facebook.com/FellowBuddycom-446240585585480
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1) The document provides a chemistry exam for Class XII students with three sections - multiple choice questions, short answer questions, and descriptive answer questions.
2) The multiple choice section contains 16 questions testing concepts across the chemistry curriculum.
3) The short answer section contains 8 questions requiring students to provide explanations, equations, or names for various chemistry concepts.
4) The descriptive answer section provides 3 essay questions where students must explain processes, properties, or reactions in fuller detail. The exam aims to comprehensively test students' understanding of chemistry.
travel agent
This document contains 8 stems with multiple chemistry questions below each stem. The stems provide chemical equations, molecular structures, names of compounds or lists of elements/compounds. Learners are asked questions testing their understanding of concepts like oxidation numbers, positions in the periodic table, bond formation, types of chemical reactions, and more. The questions require analyzing the information given in each stem and applying chemistry knowledge to explain, calculate, relate or derive requested information.
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Here are the answers to the practice questions:
1. Displacement reaction
2. (g) indicates the substance is in gaseous state
3. By storing in air tight containers to prevent reaction with oxygen
4. CO2 dissolves in water to form carbonic acid which reacts with calcium hydroxide to form calcium carbonate, making the solution milky
5. Nitrogen
6. By the direction of the gas bubbles - oxygen bubbles up and hydrogen bubbles down
7. Photodecomposition of hydrogen chloride to form hydrogen and chlorine
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2. Short answers are provided for questions asking about bleaching powder preparation, disproportionation reactions, iodized salt, uses of halogens, noble gas properties and more.
3. Longer answers discuss similarities and differences of fluorine, oxidizing properties of halogens, reactions of chlorine with sodium hydroxide, and industrial bleaching powder manufacture.
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I. This document introduces chemical reactions and their key components:
II. A chemical reaction involves the rearrangement of atoms and conserves mass. Signs of a reaction include heat, gas, precipitate, or color changes.
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London dispersion forces are the attractive force between two molecules with hydrogen bonded to the oxygen atom. CH4 has dispersion forces as its only intermolecular force. Adsorption is the process of a substance sticking to the surface of another. Surface tension is the energy required to expand the surface area of a liquid by a unit amount of area. The vapor pressure of any substance at its normal boiling point is 1 atm. The concentration of nitrate ion in a solution containing 0.900 M aluminum nitrate is 2.70 M. Sublimination is the direct conversion of a solid to a gas.
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HAZARDOUS MATERIALSQuestion 1Polar substances are de.docx
HAZARDOUS MATERIALS
Question 1
Polar substances are described as:
[removed]
a congregation of positive and negative charges on opposite ends of the molecules.
[removed]
molecules that are diatomic.
[removed]
molecules that possess only single atoms, also known as monatomic.
[removed]
molecules that only have positively charged ions.
5 points
Question 2
Decide why the heat from a candle flame is barely tolerable when a person places his or her hand above the candle compared to when the hand is placed next to the candle.
[removed]
The highest temperature is at the tip of the candle flame.
[removed]
Hot air rises upward, not sideways, by the mechanism of convection.
[removed]
Hot air rises upward, not sideways by the mechanism of conduction.
[removed]
The highest temperature is at the base of the candle flame.
5 points
Question 3
The fuel used in some racing cars contains isoamyl nitrite. Select which one of the characteristics below is classified as a chemical change/property?
[removed]
Isoamyl nitrite is a yellowish liquid having an ethereal odor.
[removed]
At 77
�
F (25
�
C) isoamyl nitrite has a specific gravity in the range 0.865-0.875
.
[removed]
Isoamyl nitrite is nearly insoluble in water.
[removed]
Isoamyl nitrite decomposes when exposed to light.
5 points
Question 4
The lead (Pb) concentration detected from a water-supply well is 0.15 mg/l (assume specific gravity of the well water is 1.0 at 25 deg C). If the drinking water standard is 15 ppb, what is your evaluation of this data?
[removed]
The Pb concentration is equivalent to 0.015 ppb and therefore meets the drinking water standard.
[removed]
The Pb concentration is equivalent to 15 ppb and therefore meets the drinking water standard.
[removed]
The Pb concentration is equivalent to 150 ppb and therefore does not meet the drinking water standard.
[removed]
The Pb concentration is equivalent to 1,500 ppb and therefore does not meet the drinking water standard.
5 points
Question 5
An area measuring 400 ft
�
120 ft is engulfed in a raging forest fire. During a single pass over the fire, a water-bearing helicopter drops sufficient water to extinguish a burning area measuring 20 m
�
20 m. Assuming the fire remains confined within the original area, how many passes must four helicopters make to extinguish the fire?
[removed]
3
[removed]
2
[removed]
4
[removed]
5
5 points
Question 6
The vaporization of the liquid elements of gasoline constitutes a __________ change.
Words:0
5 points
Question 7
Radon, which is a radioactive gas, is a member of the __________ gas family. Name one other element in this group or family: __________.
5 points
Question 8
Carbon disulfide is immiscible with water and sinks below the water because its specific gravity is __________ than 1.0.
5 points
Question .
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There are 5 general types of chemical reactions:
1. Synthesis reactions combine two or more substances to form one new substance.
2. Decomposition reactions break down a single substance into two or more new substances.
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4. Single displacement reactions involve one element replacing another in a compound.
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This document discusses:
1) Transforming worded chemical equations into balanced chemical equations. Examples include iron reacting with bromine to form iron bromide and hydrogen chloride splitting into hydrogen and chlorine.
2) Classifying chemical equations as synthesis, analysis, single replacement, or double replacement reactions. Examples classified include ammonia forming from nitrogen and hydrogen (analysis) and calcium oxide reacting with carbon dioxide to form calcium carbonate (synthesis).
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3) Catalyst experiments are discussed where manganese dioxide increased the rate of hydrogen peroxide decomposition but was not used up in the reaction.
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- The three common states of matter
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The document provides a lesson plan on chemistry topics including:
1. Diagnostic questions, answering techniques, and the particulate nature of matter will be covered.
2. Answering techniques include short answers, active sentences, keywords, and relating topics like acids/bases.
3. The particulate nature of matter is explained using kinetic particle theory including the properties of solids, liquids, and gases. Particle movement and intermolecular forces are related to physical properties.
#9 Key
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This document discusses interhalogen compounds and xenon compounds. It provides an overview of interhalogen compounds, including their classification, general characteristics, states at 25°C, methods of preparation, properties, uses, and structures. It then discusses compounds of xenon, including preparation of xenon fluorides, reactions of XeF2, xenon trioxide, oxyfluorides of xenon, and the structures of xenon compounds.
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HAZARDOUS MATERIALSQuestion 1Polar substances are de.docx
HAZARDOUS MATERIALS
Question 1
Polar substances are described as:
[removed]
a congregation of positive and negative charges on opposite ends of the molecules.
[removed]
molecules that are diatomic.
[removed]
molecules that possess only single atoms, also known as monatomic.
[removed]
molecules that only have positively charged ions.
5 points
Question 2
Decide why the heat from a candle flame is barely tolerable when a person places his or her hand above the candle compared to when the hand is placed next to the candle.
[removed]
The highest temperature is at the tip of the candle flame.
[removed]
Hot air rises upward, not sideways, by the mechanism of convection.
[removed]
Hot air rises upward, not sideways by the mechanism of conduction.
[removed]
The highest temperature is at the base of the candle flame.
5 points
Question 3
The fuel used in some racing cars contains isoamyl nitrite. Select which one of the characteristics below is classified as a chemical change/property?
[removed]
Isoamyl nitrite is a yellowish liquid having an ethereal odor.
[removed]
At 77
�
F (25
�
C) isoamyl nitrite has a specific gravity in the range 0.865-0.875
.
[removed]
Isoamyl nitrite is nearly insoluble in water.
[removed]
Isoamyl nitrite decomposes when exposed to light.
5 points
Question 4
The lead (Pb) concentration detected from a water-supply well is 0.15 mg/l (assume specific gravity of the well water is 1.0 at 25 deg C). If the drinking water standard is 15 ppb, what is your evaluation of this data?
[removed]
The Pb concentration is equivalent to 0.015 ppb and therefore meets the drinking water standard.
[removed]
The Pb concentration is equivalent to 15 ppb and therefore meets the drinking water standard.
[removed]
The Pb concentration is equivalent to 150 ppb and therefore does not meet the drinking water standard.
[removed]
The Pb concentration is equivalent to 1,500 ppb and therefore does not meet the drinking water standard.
5 points
Question 5
An area measuring 400 ft
�
120 ft is engulfed in a raging forest fire. During a single pass over the fire, a water-bearing helicopter drops sufficient water to extinguish a burning area measuring 20 m
�
20 m. Assuming the fire remains confined within the original area, how many passes must four helicopters make to extinguish the fire?
[removed]
3
[removed]
2
[removed]
4
[removed]
5
5 points
Question 6
The vaporization of the liquid elements of gasoline constitutes a __________ change.
Words:0
5 points
Question 7
Radon, which is a radioactive gas, is a member of the __________ gas family. Name one other element in this group or family: __________.
5 points
Question 8
Carbon disulfide is immiscible with water and sinks below the water because its specific gravity is __________ than 1.0.
5 points
Question .
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GenChem
STEM
Science, Technology, Engineering, and Mathematics
K to 12 Senior High School STEM Specialized Subject – General Chemistry 1 and 2
Quarter 1 – General Chemistry 1
Matter and Its Properties
Measurements
Atoms, Molecules and Ions
Stoichiometry
Percent Composition and Chemical Formulas
Chemical reactions and chemical equations
Mass Relationships in Chemical Reactions
Gases
Dalton’s Law of partial pressures
Gas stoichiometry
Kinetic molecular theory of gases
Quarter 2 – General Chemistry 1
Electronic Structure of Atoms
Electronic Structure and Periodicity
Chemical Bonding
Organic compounds
Quarter 3 – General Chemistry 2
Intermolecular Forces and Liquids and Solids
Physical Properties of Solutions
Thermochemistry
Chemical Kinetics
Quarter 4 – General Chemistry 2
Chemical Thermodynamics
Chemical Equilibrium
Acid-Base Equilibria and Salt Equilibria
Electrochemistry
Class 12 Cbse Chemistry 2010 Sample Paper Model 2
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Diploma 104 engineering chemistry
1. The document outlines the course content and objectives for Engineering Chemistry & Environmental Studies. It covers topics such as fundamentals of chemistry, solutions, acids and bases, principles of metallurgy, electrochemistry, corrosion, water technology, polymers, and fuels.
2. The course aims to help students understand concepts related to atomic structure, chemical bonding, oxidation-reduction reactions, and calculations involving molarity, molality and normality of solutions. It also examines principles of metallurgy, electrochemistry, corrosion, water treatment processes and polymers.
3. Upon completing the course, students should be able to solve numerical problems, explain various chemical theories and industrial processes, and discuss the environmental impact
Chemisty Stream (2010 December) Question Papers
This document appears to be an exam for an engineering chemistry course. It contains 8 multiple choice questions across two parts (Part A and Part B). The questions cover topics like fuels and combustion, electrochemistry, corrosion, polymers, water analysis, and more. The maximum marks for the exam is 100. Students are instructed to answer 5 full questions by choosing at least 2 from each part, and to answer all objective type questions on the OMR sheet provided.
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2nd puc chemistry_qb
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The document then provides the blueprints for two model question papers, outlining the distribution of questions from different topics across various parts of the papers. It allocates a total of 105 marks to the papers and divides them into parts A, B, C and D, with part A containing
Course Name (Legal Political and Ethical Dimensions of Business)MG.docx
Course Name (Legal Political and Ethical Dimensions of Business)MGMT520
Week 2: Assignment Instructions
In each week the learning assignment is designed to demonstrate your competence with the Terminal Course Objectives of the course. Prior to working on the assignment, you should read through the week’s chapters and lesson.
Clearly identify your work with your name, the date, the week number and the assignment name, and upload work to the Dropbox.
The questions are designed to probe the higher levels of thinking and learning such as analyzing, evaluating and creating, and so there often are no “correct” answers. Instead of focusing and who wins or loses the case, you should analyze, evaluate and create alternative solutions to the various issues presented while arguing and debating the connections between business, law, politics and ethics.
Terminal Course Objective: G
Case Study: International and World Trade Law - Counterfeiting
Write a 1-2 page reflective paper (double spaced) on the following questions while discussing the connections between business, law, politics and ethics.
One: There has been a movement in the last decade encouraging people to “buy American.” Discuss the legal and ethical issues related to boycotting goods from other countries. What are the practical business implications of such a move?
Two: The World Trade Organization, or WTO, is the largest and most influential of the trade organizations. China and other heavy counterfeiting nations are part of this group. What could WTO-participating nations do to address the problems of counterfeiting? What should they do?
Three: The United Nations Security Council, the main decision-making body at the UN, is comprised of five regular members: China, France, the Russian Federation, the United Kingdom and the United States. Ten more members are elected from the General Assembly. Given the make-up of the committee, what type of action might the UN take with regard to the counterfeiting issue?
Submit your assignment to the Dropbox.
· 10165 - CHEM - 131 - Section 001 - Spring 2016 - General Chemistry Lec II
Top of Form
Question 1
Correct
Mark 3.00 out of 3.00
Flag question
Question text
All of the following are clues that a chemical reaction has taken place except
The reactant is smaller.
a.A flame occurs.
b.A color change occurs.
c. A solid forms.
Question 2
Question text
Balance the following equation in standard form and determine the sum of the coefficients.
a.6
b.4
c.3
d.14
e.7
Question 3
Question text
Balance this equation using the smallest possible integers, S + HNO3 → H2SO4 + NO2 + H2O. What is the coefficient of water.
Select one:
a.2
b.6
c.8
d. 1
e.
Question 4
Question text
When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas?
C7H16(g) + O2(g) → CO2(g) + H2O(g)
a.5
b.11
c.2
d.14
e.8
Question 5
Question text
True or false? The equation N2 + 3H2 → 2NH3 means that 1 g of N.
Need of co2 capture new
This document summarizes a technical seminar presentation on oxygen carriers used in chemical looping combustion. Chemical looping combustion is a process for carbon dioxide capture that uses metal oxides as oxygen carriers in two interconnected fluidized bed reactors - an air reactor and a fuel reactor. In the fuel reactor, gaseous fuel reacts with the metal oxide to produce carbon dioxide, water and heat. The reduced metal oxide is then reoxidized in the air reactor. Nickel, copper, iron and manganese are common oxygen carriers that must be stable, fluidizable, resistant to agglomeration and mechanically durable. The selection of oxygen carrier is a key aspect, with nickel oxide and iron oxide being favorable but having different properties and reactivities
F.Sc. Part 1 Chemistry Paper Faisalabad Board 2013 (Malik Xufyan)
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PNEB - CHEMISTRY 2013
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