Which of the following is not a physical change?

Hydrogen has three isotopes called protium, deuterium and tritium. The atoms of these isotopes have

Isotopes of the same element differ from each other by their

If a substance conducts electricity and heat, and it is hard and shiny, it is most likely a

If a substance conducts neither electricity nor heat, and is dull and brittle it is most likely a

A change in speed, direction, or both is a change in a moving object's

Velocity is a vector quantity because it has both

Speed can be determined with the formula

Density is calculated using the following formula

According to the Second Law of Newton

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