The rate constant (k) for the decay of the radioactive isotope I-131 is 3.6 x 10-3 hours 1. The slope of which of the following graphs is correct for the decay and could be used to confirm the value of k?

Answer:

To determine the number of constitutional isomers of C4H9Br, we can generate different structures by rearranging the atoms. The molecular formula C4H9Br implies a carbon chain with four carbon atoms, and one bromine atom.

Here are the constitutional isomers for C4H9Br:

1. **n-Butyl Bromide**: This is the straight-chain isomer where the bromine atom is attached to the end carbon atom.

2. **Isobutyl Bromide**: This is an isomer with a branched chain. The bromine atom is attached to one of the middle carbon atoms in the chain.

3. **sec-Butyl Bromide**: Another branched isomer where the bromine atom is attached to one of the middle carbon atoms but in a different position compared to isobutyl bromide.

4. **tert-Butyl Bromide**: This isomer has a highly branched structure where the bromine atom is attached to a carbon atom that is part of a tertiary (3°) carbon center.

So, there are four constitutional isomers of C4H9Br. Therefore, the correct answer is (c) Four.

Tarnishing of silver is a chemical property while an apple being cut is a physical property.

What are physical properties?

Any property which describes the state of a physical system is called as a physical property.Changes in physical properties are used to describe changes between the states. They are often related to as observable properties.

Physical property which can be quantified is a physical quantity. These are also classified further with respect to their directionality. Isotropic properties do not change with direction of observation while anisotropic properties change with direction of observation.

Physical properties are differentiated from chemical properties by the way they determine how a substance behaves in a chemical reaction.

Learn more about physical properties,here:

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