Class 7 Physical and chemical change in one shot by sv education скачать в хорошем качестве

Class 7 Physical and chemical change in one shot by sv education

#sveducation #siddhi #vinayak #educational #siddhivinayakeducation #siddhivinayakdausa In this video we include these questions - Aasoka class 7 science chapter 6 physical and chemical changes Inside chapter question- True and False- 😏 (a) A new substance is formed in a physical change … (b) A chemical change is a reversible change … (c) A physical change is a temporary change … (d) Burning of wood is a physical change … (e) Digestion of food is an example of a chemical change … Circle the correct word among the two given bold to make a meaningful sentence. 😏 (a) Crystallisation is a physical/chemical change. (b) Salty water slows down/speed up the process of rusting. (c) Coating iron object with oil / water prevents rusting. (d) Rusting makes iron object weak / strong. Outside chapter question (Book work) Q.1 Multiple-Choice Question (MCQs) 😏 (a) Crystallisation is a - (b) Rusting of iron requires- (c) Lime water turns milky when – (d) When an iron nail is dipped in copper sulphate solution and kept undistributed for an hour - (e) Rita's mother made a concentrated sugar syrup by dissolving sugar in a hot water when she cold it, crystals of sugar were formed, this indicates a - (f) Which of the following will get most affected by air and moisture? Q.2 Complete the equation given below. 😏 a. Magnesium + Oxygen - b. Magnesium oxide + water c. Copper sulphate + iron d. Carbon dioxide + lime water Q.3 Write true and false. 😏 a. Boiling of water is a physical change b. during a physical change no new substance is formed c. rusting of iron can be prevented by warping iron articles in newspaper d. when a candle burns both physical and chemical changes occur e. energy is always released during a physical change f. iron object can rust if exposed only to water and not air g. dissolving sugar in a water is a chemical change h. rust Falls of the surface of iron object and expose the iron surface beneath to air and moisture Q.4 Assertion reason-based question 😏 - a. Assertion - copper turns iron sulphate solution to green colour. Reason - New substance copper sulphate is formed. b. Assertion - brown flaky layer is formed on the surface of iron in the presence of air and moisture. Reason - when iron objects are left in moist air, rusting occurs due to the formation of iron oxide Q.5 Case-Based questions 😏 - a. How is burning of wax different from melting of wax? b. The burning of a candle shows both physical and chemical change. How does the burning of a candle show physical change? c. How does burning of a candle show a chemical change? Q.6 Very short answer type questions 😏 - a. ➡️ Give an example of a chemical change? b. ➡️ What type of change is cutting of vegetables? c. ➡️ What is formed when vinegar is added to baking soda? d. ➡️ What changes occur when milk changes into curd? e. What is stainless steel made up of? Q.7 Short answer type questions 😏 - a. ➡️ What is galvanization? b. ➡️ define crystallization? c. ➡️ How can rusting of iron articles be prevented? d. ➡️ Why do ships get damaged in spite of being painted? e. ➡️ distinguish between physical and chemical changes? Q.8 long answer type questions 😏 - a. ➡️ What is Rust? How is it formed? b. ➡️ What happens when an iron needle is dipped in a copper sulphate solution? c. ➡️ With the help of an experiment, explain that the burning of magnesium ribbon is a chemical change? d. ➡️ give one example of a chemical reaction for each of the following situations: (i) change of colour is observed. (ii) a gas is evolved. (iii) Sound is produced. 👉your playlist - 👉For class 6 -    • Class 6 Fibre to fabric all question answe...   #rustingofiron #chemicalchanges #physicalchange #class7 #galvanization #crystallization #wax 👉Why Choose SV Education? Siddhi Vinayak Education (SV Education) is a premier online education platform offering comprehensive, curriculum-based courses aligned with the NCERT/CBSE standards. We provide free, full courses for students from Class 5 to Class 10, designed to help you excel in your academic career and perform exceptionally well in your board exams. 👉Disclaimer: This video is intended solely for educational and informational purposes. We do not intend to infringe on any copyrights. If you believe that this video contains copyrighted material that has been used in a manner constituting copyright infringement, please contact us at value3292024@gmail.com. We are committed to resolving any issues and will take appropriate action promptly.