I would like some help

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

Which of the following are correct values for the ideal gas laws constant r

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth