What is a demand schedule?

What is a demand schedule? What is a demand curve?
What do economists mean when they use the Latin

expression ceteris paribus?

What is the difference between a change in demand and a

change in quantity demanded?

What is the law of demand? Use the substitution effect and

the income effect to explain why an increase in the price

of a product causes a decrease in the quantity demanded.

Suppose the price of white plain flour goes up by 50 percent.

Ceteris paribus, will this affect the demand of brown

plain flour?