Is chilli a element compound or mixture?

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 is the main reason why some developing countries fear the increase the free trade policies around the world?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.