Previous Year Questions Of Chemical Reactions And Equations Class 10 Pdf Download

Question 12.

1 g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name and the colour of the products formed in each case. (2020)

Answer:

When copper powder is heated in a China dish, the reddish brown surface of copper powder becomes coated with a black substance which is copper oxide.

When hydrogen gas is passed over CuO, the black coating on the surface turned reddish brown due to the formation of Cu.

Chemical equations are symbolic representations of chemical reactions that express the reactants and products in terms of their respective chemical formulae. They also use symbols to represent factors such as reaction direction and the physical states of the reacting entities.

Previous Year Questions Of Chemical Reactions And Equations Class 10 Pdf Download

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This article contains the latest 10th class chapter-wise previous year questions of Subject Science. PYQs help students in a better understanding of the syllabus and topics covered in the exam. Solving these questions certainly helps in boosting confidence as the exam is just around the corner. Given below are the chapter name with their respective links containing questions and their solution:

Chapter 1 Chemical Reactions and Equations Class 10 Science Important Questions and Answers PDF will help you in scoring more marks. This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Chemical Reactions and Equations Chapter.

The Chemistry subject is fascinating and that contains many equations and chemical reactions. With so many chemical formulas and concepts present in the class 12 NCERT books, students get confused among them. Due to this, there is always a chance that students may skip some important concepts and study the not-so-important concepts. That is why, it is important to know the types of questions and concepts that are asked frequently in the board exam.

CHEM 15a Honors General Chemistry I

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This course may not be taken for credit by students who have passed CHEM 11a in previous years. Three class hours and one recitation per week. The corresponding laboratory is CHEM 19a.

An advanced version of general chemistry for students with good preparation in math and chemistry in high school. Topics include chemical stoichiometry, chemical bonding from a classical and quantum mechanical perspective, gases, thermochemistry, solutions, states of matter atomic structure and periodic properties. Real world examples are used to demonstrate the concepts. Usually offered every year.

Thomas Pochapsky

CHEM 15b Honors General Chemistry II

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Prerequisite: A satisfactory grade (C- or better) in CHEM 15a or the equivalent. This course may not be taken for credit by students who have passed CHEM 11b in previous years. Three class hours and one recitation per week. The corresponding laboratory is CHEM 19b.

A continuation of CHEM 15a. Topics include an introduction to thermodynamics, chemical equilibria, including acid-base and solubility equilibria, electrochemistry, chemical kinetics, nuclear chemistry, coordination chemistry and special topics. Usually offered every year.

Klaus Schmidt-Rohr

CHEM 18a General Chemistry Laboratory I

Corequisite: CHEM 11a. Dropping CHEM 11a necessitates written permission from the lab instructor to continue with this course. Two semester-hour credits; yields half-course credit. Laboratory fee: $100 per semester. This course may not be taken for credit by students who have passed CHEM 19a in previous years.

Introduction to basic laboratory methods and methods of qualitative and quantitative analyses. Included in the analytical methods are gas chromatography and infrared measurements. A synthesis project that includes analyzing the product by titration. Calorimetric experiment using probes interfaced with computers. Identification of unknowns based on physical and chemical properties. Analysis of the metal content of substances by atomic absorption. One laboratory lecture per week. One afternoon of laboratory per week. Usually offered every year.

Milos Dolnik

CHEM 18b General Chemistry Laboratory II

Prerequisites: A satisfactory grade (C- or better) in CHEM 18a and CHEM 11a. Corequisite: CHEM 11b. Dropping CHEM 11b necessitates written permission from the lab instructor to continue with this course. May yield half-course credit toward rate of work and graduation. Two semester-hour credits. Laboratory fee: $100 per semester. This course may not be taken for credit by students who have passed CHEM 19b in previous years.

The second semester of the general chemistry laboratory program. Continued use of probes interfaced with computers to monitor pH and electrical conductivity changes in titrating weak monoprotic and polyprotic amino acids, to monitor pressure changes as part of a kinetics study, and to monitor voltage changes of electrochemical cells with temperature so as to establish thermodynamic parameters for redox reactions. Also included is identification of unknowns based on selective precipitation. Usually offered every year.

Milos Dolnik

CHEM 25a Organic Chemistry I

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Prerequisite: A satisfactory grade (C- or better) in CHEM 11b or 15b or the equivalent. CHEM 25a honors option involves a separate recitation and permission of the instructor to enroll. Students in the honors section will receive a note on their transcript designating the class "Honors Organic Chemistry." Three class hours and one ninety-minute recitation per week.

Structure, reactions, preparations, and uses of the compounds of carbon. Usually offered every year.

Kristen Mascall

CHEM 33a Environmental Chemistry

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Prerequisite: A satisfactory grade (C- or higher) in CHEM 11b or 15b or the equivalent.

The course surveys the important chemical principles and reactions that determine the balance of the molecular species in the environment and how human activity affects this balance. The class evaluates current issues of environmental concern such as ozone depletion, global warming, sustainable energy, toxic chemicals, water pollution, and green chemistry. Usually offered every year.

Dwight Peavey

CHEM 59b Advanced Laboratory: Physical Chemistry

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Prerequisites: A satisfactory grade (C- or higher in CHEM 18b or equivalent; CHEM 141a or 142a (may be taken concurrently) or equivalent. One one-hour lecture and one afternoon of lab per week. Laboratory fee: $125 per semester.

This course introduces the student to a number of topics of current interest in physical and analytical chemistry and provides experimental verification of physico-chemical principles in thermodynamics, kinetics, macromolecules, organic chemistry, semiconductors, nanochemistry, photochemistry, magnetic resonance imaging and electrochemistry. The properties, reactions, and structure of compounds are understood by evaluating their physiochemical responses to changes in experimental conditions. The experiments use synthesis, spectroscopy, chromatography, electrochemical and other instrumental methods employed in the modern chemical laboratory. The program includes the methodology of quantitative measurement, statistical data analysis, and report writing. One one-hour lecture and one afternoon of laboratory per week. Usually offered every second year.

Thomas Pochapsky

BCHM 101a Advanced Biochemistry: Enzyme Mechanisms

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Prerequisites: One year of organic chemistry with laboratory and BCHM 100a or equivalents.

Describes the principles of biological catalysts and the chemical logic of metabolic pathways. Discusses representative enzymes from each reaction class, with an emphasis on understanding how mechanisms are derived from experimental evidence. Topics include serine proteases, phosphatases, isomerases, carboxylases, and dehydrogenases. Usually offered every year.