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How does the mass of the evaporating dish and its content change as heating take place?
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Is heating sand to its melting point a chemical or physical change?
Heating is purely physical, though at higher temperatures also some or many chemical reactions might take place: e.g. decomposition (break down) of mineral carbonates into oxides and carbon dioxide.
What causes a chemical change?
No, not always. For example, if you mix salt and water, no chemical change takes place. The salt dissolves in the water and a solution is formed, which is not a chemical change because the salt and water retain their individual chemical compositions.
What are the phase changes processes taking place when a substance is in equilibrium between liquid and gas phase?
Evaporating and condensing
What bowl goes on a gauze mat on top of a tripod?
We place an evaporating basin on top of the gauze mat.
What are the precautions while heating alcohol?
1. Never heat alcohol directly on naked flame 2. you should take a beaker with boiled water in it and then place the alcohol with the test tube in it 3. you should wear goggles while heating alcohol. 4. never smell the alcohol directly after heating
What are phase change process taking place when a substance is in equilibrium between liquid and gas phase?
Evaporating and condensing
When boiling take place is the phase change a chemical or phsical change?
It is a physical change, the substance stay the same elements before and after the change, this is the same for all states of matter changes (melting, freezing, evaporating, condensing, and sublamation)
Would the sugar change take place without heating?
Heating sugar it is thermally degraded. But sugar can be modified also by other chemical reactions.
How does rate of diffusion of a gas in a liquid change on heating?
if the temp is higher then diffusion take place faster
Is heating sand to its melting point a chemical or physical change?
Heating is purely physical, though at higher temperatures also some or many chemical reactions might take place: e.g. decomposition (break down) of mineral carbonates into oxides and carbon dioxide.
What causes a chemical change?
No, not always. For example, if you mix salt and water, no chemical change takes place. The salt dissolves in the water and a solution is formed, which is not a chemical change because the salt and water retain their individual chemical compositions.
How do you write clean and dry your evaporating dish and place it on the wire gauze resting on the iron ring in the past tense?
I cleaned and dried my evaporating dish and placed it on the wire gauze on the iron ring.
Can buttermilk be used in place of condensed milk in recipes?
You will change the flavor of the finished product, but the moisture content of any of them is about the same. Evaporated milk has a higher fat content, but not enough to throw off the recipe.
What are the phase change process is taking place when a substance is in equilibrium between liquid and gas phases?
(Explanation): If it is between the liquid and gas phases, we know that it is at the boiling point of water (liquid boils into gas). So, another way to say boiling is evaporating, and the opposite is condensation, because both are happening at melting point, like they talked about in the lesson.
Can evaporation takes place without heating?
no
What are the phase changes processes taking place when a substance is in equilibrium between liquid and gas phase?
Evaporating and condensing
Where should floor vents heating to be place?
in the floor.
