1. Long Answer Questions.
1. Explain the main postulates of kinetic molecular theory of matter.
2. Explain the processes that take place during interconversion of states of matter
3. Why is it important to perform an activity in a closed system to prove the law of conservation of
mass? Explain with examples.
4. State the law of conservation of mass. Prove it with the help of an activity.
Answers
Answer:
1.)The kinetic molecular theory describes the properties of molecules in terms of motion (kinetic energy) and of temperature. ... As applied to gases, the kinetic molecular theory has the following postulates: Gases are composed of very tiny particles (molecules).
2.)Matter can change from one form to other form i.e from solids to liquids to gases. The phenomenon of the change of matter from one state to another and back to original state is known as interconversion of the sates of matter. Matter can be changed from one state to another by changing temperature or pressure.
3).Imagine you enter a closed system, a room that is perfectly sealed where nothing can enter the room and nothing can escape. In this closed system, you light a candle and let it burn, watching as some of the wax seems to disappear as the flame travels down the wick. Where does the wax go? Is it truly disappearing?
The law of conservation of mass states that in a closed system, the mass of the system cannot change over time. Look at our example of the candle in the closed room. Though much of the wax itself is no longer present in its original form, all of the mass of the wax is still present in the room, albeit in a different form.
When the flame was lit, oxygen gas from the room reacted with the candle wax to produce water vapor and carbon dioxide gas. If you massed the reactants oxygen and wax, it would equal the mass of the products water and carbon dioxide. We can remember the law of conservation of mass with this simple statement:
The mass of the reactants must equal the mass of the products.
Sadly for fans of magic, anything that has mass, including matter and energy, cannot be created or destroyed. That means, mass cannot simply appear out of nowhere and equally it cannot disappear. Matter may change forms however, giving the illusion of nothing out of something or vice versa, but the mass of the matter is always the same before and after the change. If 22 grams of reactants go into a chemical reaction, then 22 grams of products must be produced.
Importance
Discovery of the law of conservation of mass helped to turn chemistry into the respectable science it is today. Chemistry has its foundations in alchemy, a protoscience that put much stock into magic and mysticism. With the advent of the law of conservation of mass, chemists took the mystery and illusion of alchemy and brought predictability and reliability to the science of chemistry.
The law of conservation of mass is very important to the study and production of chemical reactions. If scientists know the quantities and identities of reactants for a particular reaction, they can predict the amounts of products that will be made. Chemical manufacturers can increase efficiency by applying the law of conservation of mass to their laboratory practices.
Examples
Imagine you are lighting up your gas grill for the first summer barbecue. The propane from your heavy gas tank reacts with the oxygen in the air, generating a hot blue flame. The products of this reaction are water vapor and carbon dioxide
the law of conservation of mass states that mass can neither be created nor be destroyed. If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system. weigh a test tube. ... this will be equal to the weight of the reactant.
4.)The Law of Conservation of Mass states that matter can neither be created nor destroyed in a chemical reaction. Consider the formation of water molecule. Hydrogen combines with oxygen to form a water molecule. In this case, the total mass of the reactants = total mass of the products.
Explanation:
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