A double replacement reaction occurs when the ionic parts of two ionic compounds are exchanged.
Reaction 1 results in a product which is a single compound. No ionic parts are exchanged.
Reaction 3 results in one compound being separated into its elemental parts. No ionic parts are exchanged.
Reaction 4 has two reactants, but Pb is an element and not an ionic compound. No ionic parts are exchanged.
Hence, the answer is Reaction 2. Both NaBr and Ca(OH)2 are ionic compounds. Br - is the anion in NaBr, and (OH)2 is also an anion. Ionic parts are exchanged.
Answer:
See explanation
Step-by-step explanation:
A <u>parallelogram</u> is a quadrilateral with parallel opposite sides. The main property of a parallelogram is that the opposite sides of the parallelogram are congruent.
1. Sides AB and CD are congruent, then
2. Sides AD and BC are congruent, so
3. Sides AD and BC are congruent, so
Triangle RTS is a right triangle and QTP is also a right triangle
look for the little square in the corners of a right triangle