Describe how to do a flame test on a sample of a salt

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

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