What’s the molarity of citric acid & average molarity of citric acid

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?