In a double replacement reaction, which of the following occurs?

A gas, solid precipitate, or compound forms in the exchange of ions.

Energy in the form of heat or light is not always produced.

The reactants can involve a variety of elements.

A gas, solid precipitate, or compound forms in the exchange of ions.

Which subatomic particle does not contribute significantly to an atom's mass?

All contribute to the atom's mass.

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Which type of RNA is used to carry genetic code copied from DNA?

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