Is the pH changes tooth decay? Explain.

What is tooth decay ?

An ant is moving on the surface of a ball. Does its velocity change or not ? Explain.

ONE WORD ANSWER QUESTION What are the major causes of tooth decay ?

Is there any change in mass when a substance changes its state ? Explain with example.

Describe an activity to explain the situation that "the speed changes but the direction of motion remains constant".

An acid-base titration consists of the controlled addition of a dissolved base to a dissolved acid (or the reverse). Acid and base react rapidly to neutralize each other. At the equivalence point, equivalents of reacting substances are equal. The pH during a titration changes every time with a drop of titrant added, but the rate of this change varies enormously. A titration curve, graph of pH as a function of the volume of titrant, displays in detail how the pH changes over the course of an acid base titration. Significantly. the pH changes most rapidly near the equivalence point. The exact shape of a titration curve depends on the K_(a) and K_(b) of acid and base The pH at equivalence point is:

Explain whether a reaction occurs on its own, by considering the entropy change of the reaction.

How the heat of combustion of alkanes changes with branching ? Explain stability of alkanes from this.

How do you know that rusting of iron is a change? If a raw egg is boiled in water, what changes do you notice in it ? Explain.