Double replacement reactions do not show transfer of electrons, why not?

1. baking powder is a 1: 1 molar mixture of cream of tartar (khc4h4o6) and baking soda (nahco3). a recipe calls for two teaspoons (a total of 8.0 grams) of cream of tartar. how much baking soda must be added for both materials to react completely?

Areaction in which products can react to re-form reactants is

Which of the following isotopes has the same number of neutrons as phosphorus-31?