Which of these is not a sign of a chemical Reaction

The atomic number is the same as:

In a chemical equation the PRODUCTS are:

Which of these is a physical change?

Which of these is a chemical change

In a chemical reaction (pick the one that is wrong!)

______ means all atoms of the same type

A mixture is ...

Which sign of a chemical change can we see here - A piece of toast has been burned

The Symbol H stands for

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