why polychromatic light gives continious spectrum if passes throught prism and why polychromatic light gives line spectrum when passes throught hydrogen gas what is the reason of different situation that forming continious and line spectrum

Which of the following processes are exothermic and which are endothermic? a) frost forms on a car window in winter; b) water condenses on a glass of ice water on a humid summer afternoon;

What is a molecule made of and what is it's molecular mass

Samuel adds a teaspoon of salt to a glass of water. He notices that the song disappears. Samuel takes a sip to discover that the water taste salty. What kind of change has occurred?

What is the mass of 1.00 mol of sodium hydrogen carbonate?

Which begins as chemical energy and can be transformed into electricity? A. coal B. water C. sunlight D. wind

Intermolecular forces as a whole are also known as

What is the definition of a common ion as it applies to Le Chatelier's principle? A) an ion that is found in a wide variety of compounds B) an ion that is present in every sample of pure water C) an ion that is found dissolved in most aqueous

Water standing in the open at 33.0°C evaporates because of the escape of some of the surface molecules.

What could explain the changes in the insect's coloration over time A. The population of the incest increased B. The color of the surroundings changed C. A new color of predator was introuduce D. Females started to prefer darker males

Compare and contrast neap tides and spring tides discuss when they occur as well as the alignment of the earth moon sun system