Purpose: Observe the properties of carbon dioxide. Discover what happens when carbon dioxide mixes with water. Record a neutralization reaction
Materials: Dry ice, universal indicator, sodium hydroxide, water. Caution: ice is -73 celsius and may cause skin damage if it is touched. Sodium hydroxide is corrosive. Universal indicator is poisonous. Use appropriate eyewear. Wash hands with soap after the lab is over.
Procedure: Follow the procedure and write your observations:
Properties of carbon dioxide:
1. Place a nugget of ice on the table and bat it around with your hands. It'll start to slide around
2. Place a nugget of ice on the table and put a coin on it. Breathe on the coin.
3. Place a nugget of ice in a puddle of water
4. Rate of Reaction: Put ice in a flask of cold water. Now use hot water.
5. Neutralization: Put on your goggles: place a dropperful of sodium hydroxide in a flask of water and another dropperful of universal indicator. Drop a nugget of ice in the water. Observe the reaction.
Conclusions: write down your conclusions on the properties of Carbon Dioxide.
Thursday, 30 October 2014
Wednesday, 22 October 2014
Update for October lessons, Potions Lab
If you have not already done the ecosystem quiz on 2.1 , make sure that you do the 2.1 quiz. If you've already done it, please don't do it again. It is still up due to my absence (bronchitis is persisting). If you have any questions with regards to nutrient cycles, please email me. I'm expecting to go back to school soon.
Next week's lessons:
Oct 28: Review session on nutrient cycles and nutrient cycle quiz will be up. And a general Q and A on our lessons so far.
Oct 30: there will be a lab on Dry Ice to explore the physical properties of Carbon Dioxide. It'll be our Halloween lab. You will write this lab up and hand it in. It'll be a classic potions lab, for all you Harry Potter fans out there.
Next week's lessons:
Oct 28: Review session on nutrient cycles and nutrient cycle quiz will be up. And a general Q and A on our lessons so far.
Oct 30: there will be a lab on Dry Ice to explore the physical properties of Carbon Dioxide. It'll be our Halloween lab. You will write this lab up and hand it in. It'll be a classic potions lab, for all you Harry Potter fans out there.
Solid Carbon Dioxide: -73 degrees celsius! |
observe the properties of carbon dioxide and discover how to make carbonic acid in the ocean |
Monday, 20 October 2014
Lesson Notes: Nitrogen, Carbon and Phosphorus get recycled through living things.
Read the Study guide and do questions from pages 33 to 42
Read and make notes on section 2.2 of your textbook.
Assignment: draw a cartoon of the Nitrogen cycle OR the carbon cycle in a simplified form.
NUTRIENT CYCLE NOTES section 2.2
Why do
living things need
Nitrogen in their bodies? Nitrogen
is part of the amine group in an amino acid. Amino acids are
building blocks of protein and protein are building blocks
for many structures in living things. Within your body, proteins form enzymes,
pigment, muscle, cellular components. Animals have protein as a major structural
component.
How much Nitrogen is in the
atmosphere? about 80% of
air is nitrogen and the other 20% is oxygen. This nitrogen is necessary for survival for all life on earth, yet most life forms are unable to access the nitrogen without help from microbes.
How do
PLANTS AND ANIMALS
access
atmospheric nitrogen? They cannot do it alone.
PLANTS AND ANIMALS MUST ACCESS NITROGEN IN A COMPLEX, ROUNDABOUT WAY THAT DEPEND UPON BACTERIA.
PLANTS AND ANIMALS MUST ACCESS NITROGEN IN A COMPLEX, ROUNDABOUT WAY THAT DEPEND UPON BACTERIA.
here are the four steps:
STEP 1: NITROGEN FIXATION: NITROGEN GAS MUST TURN INTO AMMONIUM
STEP 1: NITROGEN FIXATION: NITROGEN GAS MUST TURN INTO AMMONIUM
N2 gets turned into NH4+
At the NH4 stage, plants are able to absorb this and use it
for life functions but animals (including humans cannot – unless you believe
those people who like to drink pee for nutrition)
a.
in
soil: nitrogen fixing bacteria in
roots These bacteria
live as symbionts in the roots of plants such as legumes (beans), clover.. Examples of nitrogen fixing bacteria living in roots is Rhizobium..
b.
An
aquatic example is Cyanobacterium
STEP
2: AMMONIUM IS TURNED INTO NITRITES AND NITRATES by NITRIFYING BACTERIA in the
soil:
NH4+ gets turned into NO3-:
ammonium turns into nitrates
STEP 3: Both Ammonium and NITRATES CAN NOW BE ABSORBED by PLANTS through their roots:
ammonium turns into nitrates
STEP 3: Both Ammonium and NITRATES CAN NOW BE ABSORBED by PLANTS through their roots:
Plants take the nitrate and turn it into plant proteins
STEP 4: PLANTS ARE EATEN BY ANIMALS
STEP 4: PLANTS ARE EATEN BY ANIMALS
When animals eat plants, the plant protein are converted into animal protein.
Are there
other sources of nitrogen without following those steps? There are three other sources:
1. When animals and plants die, their bodies decompose into AMMONIUM Microbes and fungi and other DECOMPOSERS are responsible for this
2. When animals urinate in the environment, urine breaks down into AMMONIUM
1. When animals and plants die, their bodies decompose into AMMONIUM Microbes and fungi and other DECOMPOSERS are responsible for this
2. When animals urinate in the environment, urine breaks down into AMMONIUM
3. Lightening strikes can make
nitrates in the soil .
What would happen if Rhizobium, Cyanobacteria and all
Those nitrogen fixers became
extinct?
First plants would die from lack of nitrogen and then all the animals would die. We depend on the nitrogen fixers to make our protein. (you are protein, when you stop to think about it…)
First plants would die from lack of nitrogen and then all the animals would die. We depend on the nitrogen fixers to make our protein. (you are protein, when you stop to think about it…)
How is nitrogen returned back to the
atmosphere? DENITRIFICATION: again
a task performed by bacteria: the
denitrifying bacteria.
EUTRIFICATION: too
much of a good thing nitrogen is
essential so more nitrogen is better right? Wrong. Human
industry and agriculture can release ammonia into the environment (a lake) and
cause algae to bloom. Algae grows quickly and then dies all at once, robbing
the lake of oxygen. Fish die as a result.
Images to remember Copy
fig 2.35 and 2.37 in words p. 80 and 81 in your textbook
CARBON CYCLE
Carbon
cycled throughout the earth’s history The Carbon dioxide you are breathing out now could have contained
carbon from Isaac Newton’s teacup and the same one that entered a prehistoric
plant through photosynthesis. The
carbon emitted from a car was photosynthesized by an aquatic plant millions of
years ago. Carbon on earth never really disappears. It just gets used over and over again.
Carbon
cycles through these places
1. atmosphere in the form of carbon dioxide: CO2
1. atmosphere in the form of carbon dioxide: CO2
2. Plant material: cellulose, starch
3. Animal material: carbon is in our fat and protein.
4. Shells of phytoplankton: calcium carbonate shells
5. Dissolved in the ocean: as carbonic acid
Atmospheric carbon has sources and sinks :
a
sink removes carbon dioxide from the atmosphere.
A source returns carbon back to the atmosphere.
A source returns carbon back to the atmosphere.
Examples of Carbon
sinks
1.
PLANTS,
especially forests and
bogs THROUGH PHOTOSYNTHESIS
CO2
+ H2O sunlightà C6H12O6 + O2
Also
fossilized plants:
3. atmosphere to the ocean carbon
dioxide gets absorbed into the ocean and turns into carbonic acid. This acid is a buffer. The buffer has a tendency to maintain
ocean acidity at a constant level
4. ocean to phytoplankton
shells the bicarbonate
ion HCO3- can
combine with calcium to make calcium carbonate CaCO3 shells for a
variety of sea life, including phytoplankton. This carbon can be locked up for millions of years as the
sea life dies and turns into limestone cliffs.
Examples of Carbon
sources:
1. animals breathing: cell respiration
2. plants and animals dying and releasing carbon dioxide
3. fossil fuel combustion:
2. plants and animals dying and releasing carbon dioxide
3. fossil fuel combustion:
C6H12O6
+ O2 --> CO2 + H2O
PHOSPHORUS
CYCLE
PHOSPHORUS
is used for 1. energy: part of adenosine triphosphate, an energy molecule
2. Makes
genetic material: DNA and RNA
3. In
vertebrate animals: makes bone
4. In
plants: promotes growth
PHOSPHORUS
CYCLE FROM
LIVING THINGS TO THE SOIL AND BACK AGAIN.
Phosphate
is trapped in rocks, sediments, ocean floor
Weathering
releases phosphates
EUTRIPHICATION humans
add phosphorus to the environment resulting in algal blooms and fish death
Water and Carbon Cycle Crash Course
Water and Carbon Cycle Crash Course
Tuesday, 14 October 2014
Ecological Webs and Ecological Pyramids. How the Sun's Energy gets into Everything
Vocabulary words. Read the study guide section 2.1 that's pages 34 - 42.
In your textbook, read Chapter 2, section 2.1 to review these concepts. At the end of this post there is a quiz.
In an ecosystem, you are food!
In this section, we explore the many ways of visualizing the ecosystem. These include
Food Chain
Food Web
Pyramids showing trophic levels
Ecological Pyramid: Four kinds
Food Pyramid showing trophic levels
Biomass Pyramid
Pyramid of Energy
Pyramid of numbers
When you finish doing the questions in the study guide, check out the provincial exam samples on the ministry website and then try this quiz. You have until next tuesday to submit your responses. Careful. some questions are really tricky!
In your textbook, read Chapter 2, section 2.1 to review these concepts. At the end of this post there is a quiz.
In an ecosystem, you are food!
In this section, we explore the many ways of visualizing the ecosystem. These include
Food Chain
Food Web
Pyramids showing trophic levels
Members of the ecosystem can be divided into these categories:
Producer: a plants and any photosynthesizing microbe.
Primary Consumer: a herbivore
Secondary Consumer: can be a carnivore who eats herbivores. Also can be an omnivore who
eats herbivores
Tertiary Consumer: a carnivore: one who eats carnivores and herbivores
detrivore: one who eats dead and decaying things
decomposer: Fungi and Microbes: consume decaying things and breaks them down into
elements and compounds. Decomposers cause the biodegradation of other organisms
Food Pyramid showing trophic levels
Biomass Pyramid
Pyramid of Energy
Pyramid of numbers
When you finish doing the questions in the study guide, check out the provincial exam samples on the ministry website and then try this quiz. You have until next tuesday to submit your responses. Careful. some questions are really tricky!
Subscribe to:
Posts (Atom)