Question

a physical reaction is_____.
a change that does not make something new and different from the starting substances
a change that makes something new and different from the starting substances.
an explosion
a red apple
question 9
54
xe
xenon
131.29
how many protons does the element xenon have?

Explanation:

1. For the first - part about physical reaction: In chemistry, a physical reaction is a change that does not create a new substance. For example, melting ice is a physical change as it is still water in a different state.
2. For the second - part about Xenon: The atomic number of an element is equal to the number of protons. The atomic number of Xenon (Xe) is 54, so it has 54 protons.

Answer:

1. a change that DOES NOT MAKE SOMETHING NEW and different from the starting substances
2. 54