School Certificate Science MARATHON (1 Viewer)

[Riot09]

really water!!!,i dont we just pump water out of the atmosphere or make a car that runs on water then? the latter would be very hard.

 

[hermand]

why does my signature change to my profile picture and then after i edit a post it changes to my current signature then after i leave and come back it changes to the profile picture again?

and a dna molecule make up genes which make up chromosones that determine charecteristics such as etc........

i gues that would count as my question

i dunno. it's your profile picture on my computer.

gosh, i knew more than that about dna in y10.

 

[lpodnano]

Explain the term Mitosis and Meiosis.

 

[Riot09]

mitosis-is a process of cell division that creates body cells,which enables organisms to grow and repair tissue.Asexual repoduc... also occurs by mitosis.During mitosis chrom....(dna) make copies of themselves (dna replication) and each cell recieves the same no. and type of chromosones and genes as the parent cell.

Meiosis-is a process of cell division that creates gametes or reproduc... cells.

is my signature my profile picture or a drawing showing on your'e computer?
(if i leave this post and come back it changes to my profile picture for some reason)

Q.outline the differences of Aerobic and anerobic respiration and give an example for the 2.

 

[muzeikchun852]

Q.outline the differences of Aerobic and anerobic respiration and give an example for the 2.

aerobic - oxygen provides the catalyst for a chemical reaction in our muscles (including the heart) that generates aerobic energy (swimming)

anerobic - provides sustainable energy for not very long (100m running)

question: equation of photosynthesis.

 

[Riot09]

6co2+12h2o+light energy=c6h1206+6h2o+602

or carbon dioxide+water+light energy=glucose+water+oxygen

q.outline the features of the carbon cycle

 

[muzeikchun852]

q.outline the features of the carbon cycle

the recycling in nature through the interactions between plants and animals. plants use CO2, water and energy in photosynthesis, and produce glucose and oxgen. then process to animal to produce CO2, water and energy. cycle back.

question: name one althernative renewable resources. and how they work.

 

[Mudkip94]

q.outline the features of the carbon cycle

There's CO₂ in the atmosphere and some is used by plants to:

• create carbohydrates through photosynthesis, animals eat the plants and breathe out CO₂ into the atmosphere where it can go through the cycle again
• some of the carbon goes into the ground and is stored in fossil fuels. When these are burned they release CO₂ which can go through the cycle again.

My Question: Name three viral, three bacteria and three genetic diseases.

 

[Riot09]

virus:flu,swine flue

bacteria:germs,

genetic:cancers,down syndrome and hiv/aids

 

[lpodnano]

Everyone seems to have answered and not left me a question ;(

lol.
Ah well.

Give an example of precipitation (chemistry)

 

[supre]

Give an example of precipitation (chemistry)

AgNO3 + KCl --> KNO3 + AgCl

My Turn: differentiate between homozygous and heterozygous cells

 

[Mudkip94]

My Turn: differentiate between homozygous and heterozygous cells

Homozygous have both genes same for a trait e.g. pure black hair.
Heterozygous have both genes different for a trait e.g. hybrid blond hair.

My Question: What is the chemical equation for CFCs destroying ozone?

 

[supre]

My Question: What is the chemical equation for CFCs destroying ozone?

[FONT=Arial, Helvetica, sans-serif]CFCl3 + UV Light ==> CFCl2 + Cl[/FONT]

My question: discuss the theory of plate tectonics.

 

[Mudkip94]

[FONT=Arial, Helvetica, sans-serif]CFCl3 + UV Light ==> CFCl2 + Cl[/FONT]

That's just UV breaking a bond and making Cl radicals...

CF₃Cl + UV Light --> CF₃· + Cl·

Cl· + O₃ --> ClO· + O₂

ClO· + O₃ --> Cl· + 2O₂

Then the Cl· repeats the process 10⁶ times and kills lots of our ozoney buddies.

 

[Riot09]

convection currents in the mantle move the crustal plates around the earth.some move away or move toward each other creating mountains and earthquakes.as aplate moves away from each they leave behind mid-ocean ridges.

also plate tectonics,due to the convection currents in the mantle cause continental drift.

q.list at least 2-3 advantages and disadvantages of biotechnology....

 

[Mudkip94]

q.list at least 2-3 advantages and disadvantages of biotechnology....

• Ethical issues surrounding cloning, stem cell research
• some people may be allergic to GM stuff
• some insects may develop resistance to GM crops and become 'superbugs'.

My Question: What conditions must be true for an object to be considered a planet by the IAU?

 

[maths94]

• Ethical issues surrounding cloning, stem cell research
• some people may be allergic to GM stuff
• some insects may develop resistance to GM crops and become 'superbugs'.

My Question: What conditions must be true for an object to be considered a planet by the IAU?

1) A planet is a celestial body that (a) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (b) is in orbit around a star, and is neither a star nor a satellite of a planet.

(2) We distinguish between the eight classical planets discovered before 1900, which move in nearly circular orbits close to the ecliptic plane, and other planetary objects in orbit around the Sun. All of these other objects are smaller than Mercury. We recognize that Ceres is a planet by the above scientific definition. For historical reasons, one may choose to distinguish Ceres from the classical planets by referring to it as a “dwarf planet.”

(3) We recognize Pluto to be a planet by the above scientific definition, as are one or more recently discovered large Trans-Neptunian Objects. In contrast to the classical planets, these objects typically have highly inclined orbits with large eccentricities and orbital periods in excess of 200 years. We designate this category of planetary objects, of which Pluto is the prototype, as a new class that we call “plutons”.

(4) All non-planet objects orbiting the Sun shall be referred to collectively as “Small Solar System Bodies”.

Question:What did Nikola Tesla invent?

 

[supre]

My Question: What conditions must be true for an object to be considered a planet by the IAU?

• the object must be in orbit around a star, while not being itself a star
• the object must be large enough for its own gravity to pull it into a nearly spherical shape.

 

[muzeikchun852]

Question:What did Nikola Tesla invent?

the basis of modern alternative current electric power system.

question: make a experiment of creating a natural indicator.

 

[zxreth]

anyone have any ideas what the long response (i.e. 3-6 markers) could/should be on??? thanks.