You are given the following substances with their melting and boiling points. Substance Melting point (°C) Boiling point (°C)

X -219 -183

Y 119 445

Z – 15 78
Find the state of x, y and z

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Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

What substance has a mass of 9.5g and volume of 2.1cm^3

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)