Chapter 4 Q/A Flashcards
(33 cards)
What is a mixture? Give a few examples.
Page 74-76
Is salt solution a compound? Why?
Page 74
Answer the following questions:-
a. What are the main gasses which make up the air?
b. Which of the gasses, including water vapour, are elements?
c. Which gas is present in the greatest amount in clean, dry air?
d. Which gas is present in the least amount in clean, dry air?
Pie Chart Page 75
(Think About It Page 75)
Identify a process which increases the amount of carbon dioxide and decreases the amount of oxygen in air. Identify a process which increases the amount of oxygen and decreases the amount of carbon dioxide in air.
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What is mixed with water to make it sparkling?
mhm
First Try it Out Page 77
What is ‘stainless steel’? What makes steel ‘stainless’? In what ways is stainless steel better than pure iron in making cutlery?
eriufheriugh
What are the general properties of mixtures and use air as an example?
Page 77
Second Try it Out Page 77
Compare the general properties of compounds and mixtures.
err, just check dat page
What is melting and boiling point? Name the melting and boiling points of some substances.
Page 78
In the properties of different substances, how are elements, compounds, and mixtures different? How do one of the properties vary with mixtures? Give an example. What happens when impurities are added?
Page 79
Think About It Page 79
What are the states of sodium, chlorine, and sodium chloride at 100 degrees Celsius?
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State whether they are mixtures (M), compounds (C), or elements (E).
- Milk
- Mercury
- Sulphur
- Bronze
- Diamond
- Sugar
- Plastic
- Ink
- Muddy Water
Page 80
Name examples of separation techniques for mixtures. What do they take advantage of? Give an example to illustrate this.
Page 81
Describe Filtration. Give a few worldly examples.
Page 81-82
Try it Out Page 82
How is filtration used in the human body? What substances are being filtered? Which organs are being filtered?
skibidi sigma ohio 🪳
Name the sand filters used in water treatment plants.
Page 82
Describe evaporation. Show two of the setups. Label them too
Page 83
Can you separate common salt from water using filtration? Why?
Page 83
Why are shallow pans used instead of deep pans for obtaining salt from seawater?
Shallow pans speed up salt extraction because they expose more water to air and sunlight, allowing faster evaporation compared to deep pans.
How does evaporation to dryness work? How does evaporation using a steam bath work?
Evaporation to dryness simply works like this: The bunsen burner heats the solvent, like water, inside the evaporating dish, causing it to evaporate somewhat quickly, and leaving the solute, like salt, behind as residue. On the other hand with evaporation using a steam bath, the boiling chips inside the beaker are there to prevent splashing and violent boiling. The water inside the beaker evaporates into steam by the heat from the bunsen burner and it rises up the beaker. This steam reaches the watchglass and heats up the solution in it. The solvent in it evaporates gently, and the solute remains as resiude. This indirect heating method can be safer.
Try it Out Page 84
Name the properties of sawdust, sand, and ammonium chloride. Using these properties, how would you separate the three substances if they were mixed together?
logic
Think About It Page 84
Can sugar be obtained from a sugar solution by heating the sugar solution and evaporating the water? Explain.
efgiu
Describe distillation. What is involved in the setup?
Page 84
How is distillation used in some countries?
Page 85
