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28 January, 22:21

Which of the following is a chemical change?

wind breaking down a rock into smaller pieces

a leaf falling off of a tree during a storm

a screwdriver rusting when left in a pail of water

a block of ice melting in the sun

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Answers (2)
  1. 28 January, 22:44
    0
    A screw driver rusting when left in a pail of water is a chemical reaction
  2. 28 January, 23:04
    0
    a screwdriver rusting when left in a pail of water

    Explanation:

    In case of chemical change we can say that there must be a chemical reaction due to which there will be a change in the chemical reactants.

    As we can see the given options

    1). wind breaking down a rock into smaller pieces

    There is no chemical reaction between them and it just a physical change of big size to smaller size

    2). a leaf falling off of a tree during a storm

    As we know that here also leaf detach from the tree so there is only physical change again.

    3). a screwdriver rusting when left in a pail of water

    Here we will have a chemical change due to which iron made its oxide due to chemical reaction of iron and oxygen

    4). a block of ice melting in the sun

    This is also physical change in which water molecules change from its solid state to liquid state

    So here correct answer will be

    a screwdriver rusting when left iwind breaking down a rock into smaller pieces

    a leaf falling off of a tree during a storm

    a screwdriver rusting when left in a pail of water

    a block of ice melting in the sunwind breaking down a rock into smaller pieces

    a leaf falling off of a tree during a storm

    a screwdriver rusting when left in a pail of water

    a block of ice melting in the sunwind breaking down a rock into smaller pieces

    a leaf falling off of a tree during a storm

    a screwdriver rusting when left in a pail of water
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