Question

C4(a)When you have mixed the solution of lead nitrate and potassium iodide
1. What was the colour of the ppt 2.what type of reaction is this. 3.Write a
balanced chemical equation(2) C4(b)A white powder is added while baking
breads and cakes to make them soft and fluffy. Write the name of powder write
the main ingredients Expaon the function of each ingredient Write the equation
C4c.Explain tooth decay ​

Answer 1

Answer:

1. Yellow

2.Double Displacement Reaction

Pb(No3)+KI------ PbI2+ KNo3

Baking powder. Baking soda and tartaric acid. On heating or mixing with water, sodium bicarbonate reacts with hydrogen ion from acid and releases CO2 that makes the cake soft and fluffy. Tartaric acid is used to avoid the bitter taste by reacting with Na2CO3 formed.

NaHCo3+H------- Na2Co3+H2o+Co2

Tooth decay (dental caries) is damage to a tooth that can happen when decay-causing bacteria in your mouth make acids that attack the tooth's surface, or enamel. This can lead to a small hole in a tooth, called a cavity. If tooth decay is not treated, it can cause pain, infection, and even tooth loss.