Waste System

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# Waste System - PowerPoint PPT Presentation

Waste System. Pg. 190-193. Solubility Pg. 17. There is a limit to the amount of solute you can add to a solvent Solution = solvent + solute Ex: Kool-aid = water + kool-aid powder

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## PowerPoint Slideshow about 'Waste System' - merle

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### Waste System

Pg. 190-193

Solubility Pg. 17
• There is a limit to the amount of solute you can add to a solvent
• Solution = solvent + solute
• Ex: Kool-aid = water + kool-aid powder
• Have you ever made hot chocolate and could not get the powder in the bottom to mix in (no matter how long you stirred?)
• This is because your hot chocolate reached solubility
Solubility
• The maximum amount of solute that can be dissolved in a given amount of solvent
• Name the solute, solvent and solution in the following examples:
• Ice tea, ice tea powder, water
• Salt, salt water, water
• Water, grapes, wine
• Concentration is measure C= m/v
Concentration
• C=m/v
• C= concentration
• m = mass of solute (g)
• v = volume of solvent (L)
• Find the concentration of salt when 5g of salt is added to 2L of water. What is the final solution?
Solubility
• Just like concentration, solubility can be expressed with many units
• g/L
• Percent mass (%m/V)
• Percent volume (%V/V)
• Percent mass (%m/m)
• If there is less than the maximum amount of solute (not enough salt in soup) it is called unsaturated
Solubility
• If it contains exactly the maximum amount of solute (you do not need to add any salt to your soup) it is called Saturated
• If it contains more than the maximum amount of solute it is called supersaturated
• In most cases the extra solute is called a Precipitate
Solubility
• Depends on many factors
• Nature of the solute (will sand ever dissolve in water?)
• Temperature (does cold water or hot make sugar dissolve faster?)
• Pressure (do you think it is easier to make Kool-aid at sea level or up on Mount Everest?)
Temperature variations Pg. 18
• When temperature increases so does the solubility of many solids
• Solubility of many gases decreases when temperature increases
• Fig 1.21 and 1.22 what do you see??
• Table 1.23 how is the dissolving of sugar changed? Explain what you see…
Aqueous solution
• What does aqueous mean? Anything sound familiar?
• As soon as you add water (solvent) to a solute it becomes an aqueous solution
• Write an example of an aqueous solution and describe the solvent and solute for me.

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Dissolution
• When you have too much solute compared to solvent
• Give an example…what about soup?
• How would this change your concentration?
• Can you explain this using the particle model?
• Pg. 16 use the idea from Dilution
• Draw it out for me…
Dilution
• When you have too much solvent compared to solute
• Give an example…what about soup?
• How would this change your concentration?
• Can you explain this using the particle model? Pg. 16
• Draw it out for me…
Dilution pg. 16
• How would your concentration change after you dilute your solution? (increase or decrease?)
• You need to be able to show me mathematically as well as with the particle model
• Mathematically we use the formula

C1V1= C2V2 what is C1?V1?C2?V2?

Dilution problem on pg. 16
• Let’s do the math together… SHOW YOUR WORK!
Dilution
• Problem 2

I have 2 L of lemonade with a concentration of 4g/L, but Alex tells me it is too sweet so I add 2 more litres of water. What is the new concentration of the lemonade?

Dilution homework
• Complete the Dilution worksheet I gave you March 12th
• For homework and it is for marks!!
Urinary System
• The elimination of waste from the body
• Cellular activity can produce waste that is toxic to the body and must be eliminated
• EXCRETION is the process by which waste products are eliminated from the body
• Main organs that eliminate waste: lungs, kidneys and sweat glands
Sweat glands
• There are ~ 2 500 000 sweat glands on the surface of your body
• These glands secrete sweat by means of a channel that opens on the skin’s surface
• Sweating or perspiration is a mechanism that helps to regulate body temperature (mainly in hot weather or when we exert ourselves)
• Sweat is made up of water and waste materials from the blood
• This is why sweat plays a role in excretion
Urinary System
• Main parts include: kidneys, ureters, bladder and urethra
• The tubes that carry urine are the ureters and urethra
• Pg. 191 Fg 6.47 make sure you can label all the parts and know where they are located
• Table 6.48 pg. 192 explains the description and function of the main parts…KNOW THEM!!
Kidneys
• Description:
• Function:
Ureters
• Description:
• Function:
• Description:
• Function:
Urethra
• Description:
• Function:
Summary
• What is solubility?
• What can affect solubility of a substance (like solid or gas)?
• Describe solute, solvent and solution and how they can make a concentration
• What is an aqueous solution?
• How would you use C1V1=C2V2?
Summary
• What is dissolution?
• Can you draw it?
• What is dilution?
• Explain it using concentration and volume
• Name the main parts of the urinary system
• What are their functions?
• What is the main role of the excretory system?
Almost done… Pg. 192
• Main components of urine…
• The kidneys filter the blood, removing waste and creating a liquid called urine
• Urea is the chief waste product from the blood
• It is created when the cells use protein to produce energy and amino acids are oxidized (oxygen and energy)
• Write the equation for this oxidization:

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More on urine
• Kidneys also help keep blood in balance
• They stabilize the amount of water in the blood, constant concentration of mineral balance
• If the blood contains excess (too much) water or minerals, the kidneys EXCRETE them
• Urine:
• Water (90%)
• Urea (2.5%)and other waste
• Minerals
• Excess substances in blood (if you took a multi-vitamin you would pee out whatever is not absorbed…so you should eat FRESH and real food whenever possible)
And more…
• Urine could also contain…
• Protein, glucose, fats and blood cells (BUT if this is in your urine it is a bad health sign)
• Traces of medication or drugs (this is why athletes have to do urine checks to see about Doping/steroids)
• Amount of urine produced by body can depend on concentration of minerals in blood and amount of water in body
Urine
• If mineral concentrations is too low, the kidneys excrete more water, Raising the level of minerals
• BUT if the body lacks water, the concentration of minerals in the body is too high, the kidneys Excrete LESS water so we feel thirsty.
• This the body’s way of letting you know you need to drink more liquid and help maintain homeostasis!!!
Homework
• Pg. 197
• # 18-20
• Due next class
• On a Loose Leaf paper so I can pick it up
• HAVE FUN!!! 