7. Is the boiling point of water on a mountaintop
the same as that on the ground?
8. Water is cooled to 0°C. What do you expect to
happen?
9. What happens when a gas is cooled?
10. What happens when ammonium chloride is
heated?
11. 25 mL each of water and alcohol are taken in
two separate dishes and left exposed to air.
What do you expect to observe?
12. What is the fourth state of matter called?
Answers
Answer:
7 Is the boiling point of water on mountain top the same as on the ground ? no,the boiling point is not the same. because of the low atmosphereic pressure,the water begins to boil at mountain top at 92oc but the water begins to boil at 100oc on the ground
8
Water is cooled to zero degree celsius what do you expect to 'Anamalous Expansion of Water'. As all liquids do, it will start contracting when water is cooled. But this will begin to increase from 4–0 ° C volume of water due to the unique property of water known as ' Anomalous Expansion of water.
9
When a gas is cooled ,it's molecules becomes less active. They stay together not moving much. When cooled enough ,the gas becomes a liquid.
10
When ammonium chloride is heated it undergoes dissociation to form a product such as NH3 and HCl. The ammonium chloride undergoes sublimation when it is heated, the substance undergoes changes from solid to gas. The gas contains molecules such as ammonia and hydrogen chloride.
11
25mL each of water and alcohol are taken in two separate dishes and left exposed to air. What do you expect to observe? Alcohol will get mixed with the atmosphere and water will remain as it is. Alcohol is volatile substance (those can be vaporised easily) it takes heat energy form surrounding and vaporised slowly.
12
Plasma is often called “the fourth state of matter,” along with solid, liquid and gas. Just as a liquid will boil, changing into a gas when energy is added, heating a gas will form a plasma – a soup of positively charged particles (ions) and negatively charged particles (electrons).