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

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

i would say

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000