Home/Class -10: Chemistry/10th Chemistry: Ch-01 Chemical Reactions and Equations

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Mukesh Pandit
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Mukesh PanditNCT#
Asked: November 21, 2022In:
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⚠ This activity needs the teacher’s help. It would be better if students wear suitable eyeglasses. Clean a magnesium ribbon about 3-4 cm long by rubbing it with sandpaper. Hold it with a pair of tongs. Burn it using a spirit lamp or ...Read more

⚠ This activity needs the teacher’s help. It would be better if students wear suitable eyeglasses.

  • Clean a magnesium ribbon about 3-4 cm long by rubbing it with sandpaper.
  • Hold it with a pair of tongs.
  • Burn it using a spirit lamp or burner and collect the ash so formed in a watch glass as shown in fig.1.1. Burn the magnesium ribbon keeping it away as far as possible from your eyes.

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  1. Mukesh Pandit
    Mukesh Pandit NCT# Chief Marketing Officer

    We have observed that magnesium ribbon burns with a dazzling white flame changes into a white powder. The powder is magnesium oxide. It is formed due to the reaction between magnesium and oxygen present in the air.

    We have observed that magnesium ribbon burns with a dazzling white flame changes into a white powder. The powder is magnesium oxide. It is formed due to the reaction between magnesium and oxygen present in the air.

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Mukesh Pandit
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Mukesh PanditNCT#
Asked: November 21, 2022In:
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milk is left at room temperature during summer. an iron tawa/pan/nail is left exposed to humid atmosphere. grapes get fermented. food is cood. food gets digest in our body. we respire.

  • milk is left at room temperature during summer.
  • an iron tawa/pan/nail is left exposed to humid atmosphere.
  • grapes get fermented.
  • food is cood.
  • food gets digest in our body.
  • we respire.
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  1. Mukesh Pandit
    Mukesh Pandit NCT# Chief Marketing Officer
    This answer was edited.

    In all the above situations , the nature and the identity of the initial substance have somewhat changed i.e chemical reactions have taken place.

    In all the above situations , the nature and the identity of the initial substance have somewhat changed i.e chemical reactions have taken place.

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Mukesh Pandit
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Mukesh PanditNCT#
Asked: November 21, 2022In:
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  1. Mukesh Pandit
    Mukesh Pandit NCT# Chief Marketing Officer

    Whenever a chemical change occurs that means a chemical reaction has taken place.

    Whenever a chemical change occurs that means a chemical reaction has taken place.

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Mukesh Pandit
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Mukesh PanditNCT#
Asked: November 21, 2022In:
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  1. Mukesh Pandit
    Mukesh Pandit NCT# Chief Marketing Officer

    Two different atoms or group of atoms (ions) are exchanged in the double displacement reactions.

    Two different atoms or group of atoms (ions) are exchanged in the double displacement reactions.

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Mukesh Pandit
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Mukesh PanditNCT#
Asked: November 21, 2022In:
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  1. Mukesh Pandit
    Mukesh Pandit NCT# Chief Marketing Officer

    Whenever a chemical change occurs, we can say that a chemical reaction has taken place. Any of the following observations helps us to determine whether a chemical reaction has taken place: change in colour change in temperature change in state evaluation of a gas.

    Whenever a chemical change occurs, we can say that a chemical reaction has taken place. Any of the following observations helps us to determine whether a chemical reaction has taken place:

    • change in colour
    • change in temperature
    • change in state
    • evaluation of a gas.
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Mukesh Pandit
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Mukesh PanditNCT#
Asked: November 21, 2022In:
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  1. Mukesh Pandit
    Mukesh Pandit NCT# Chief Marketing Officer

    The reactions in which heat is given out along with the products are called exothermic reactions.

    The reactions in which heat is given out along with the products are called exothermic reactions.

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