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Visita al parco di Porto Conte del 18/05/17

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Visita al parco di Porto Conte del 18/05/17

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La visita al parco è iniziata parlando di come il parco assista gli apicoltori offrendo loro il laboratorio per la smieltura. Ci ha in seguito condotto a vedere quali fiori presenti nel parco fossero "interessanti" per le api. Abbiamo scoperto che non tutti lo sono, ma che le attraggono principalmente quelli sulle tonalità del viola-rosa scura.
Più tardi abbiamo svolto un'attività utile per comprendere meglio la struttura del corpo dell'ape e come il miele venga prodotto da lei e prelevato e messo nei barattoli per essere commerciato dagli apicoltori. Abbiamo avuto anche il piacere di assaggiare tre tipi di miele diversi: di rosmarino, millefiori ed eucalipto. Bellissima esperienza.

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Il nome comune gambero identifica varie specie di crostacei acquatici appartenenti agli ordini dei Decapodi (Astacidea), degli Euphausiacea (krill), degli Stomatopoda e dei Mysida.
Il termine generico "gambero" viene utilizzato per indicare sia le specie marine sia quelle d'acqua dolce.
Il corpo dei gamberi è suddiviso in tre parti: capo, torace e addome.
Il capo presenta l'antenna, l'antennula, due mascelle e una mandibola.
Nel torace sono presenti cinque appendici ambulacrali più tre paia di appendici modificate a massillipedi. Tre paia di questi, muniti di chele, sono utilizzati per il nutrimento. Infine nell'addome sono presenti sei paia di appendici che non hanno funzione ambulacrale, ma rappresentano invece appendici atte al movimento dell'acqua in avanti. In questo modo l'acqua viene spinta in avanti e fatta filtrare nelle branchie che si trovano su una parte delle appendici biramose del torace.
L'addome presenta sei segmenti terminanti con il telson.
La femmina non può accoppiarsi prima della muta del carapace e generalmente tre volte l'anno.
La quantità di uova prodotte varia a seconda dell'età della femmina. Una volta fecondate le uova si trovano sospese sull'addome fino alla schiusa, che varia da qualche settimana a qualche mese in relazione alla temperatura dell'acqua.

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Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" (abdomen) (Greek: βραχύς / brachys = short, οὐρά / οura = tail), usually entirely hidden under the thorax. They live in all the world's oceans, in fresh water, and on land, are generally covered with a thick exoskeleton and have a single pair of claws.
Crabs are generally covered with a thick exoskeleton, composed primarily of calcium carbonate, and armed with a single pair of chelae (claws).
The vast number of brachyuran crabs have internal fertilisation and mate belly-to-belly. For many aquatic species, mating takes place just after the female has moulted and is still soft. Females can store the sperm for a long time before using it to fertilise their eggs. When fertilisation has taken place, the eggs are released onto the female's abdomen, below the tail flap, secured with a sticky material. In this location, they are protected during embryonic development. Females carrying eggs are called "berried" since the eggs resemble round berries.
When development is complete, the female releases the newly hatched larvae into the water, where they are part of the plankton.
They breath with gills.

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Osteichthyes are a taxonomic superclass of fish, also called bony fish, that includes the ray-finned fish (Actinopterygii) and lobe finned fish (Sarcopterygii). The split between these two classes occurred around 440 million years ago. The Osteichthyes are paraphyletic with land vertebrates. This is why some classification schemes put the tetrapods into the Osteichthyes.
We examined the European pilchard (Sardina pilchardus) is a species of ray-finned fish in the monotypic genus Sardina.
Its color was silver, light blue, gray to camouflage itself from predators. We observed the anus, the air bladder, the branchias and we learnt that the shape of the body is useful to swim faster and the alae to swim and to stabilize the fish during strong currents. Here I put the photos taken by me during the experiment.

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It's an activity which joins sports and science.
It involves teens from 14 to 16 years old of the High School "Liceo Scientifico E. Fermi" of Alghero that interact with children of different primary schools of Alghero.
They propose 20 experiments related to density (for those of 7-8 years old) and to light (for those of 9 years old)🌼

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Riso
Peso un chicco di riso e immagino che sia una molecola di 0.018g
Peso un pugno di riso=18g
Molecole in un pugno di riso=18*0.018=1000 molecole

Sale
Massa di un cristallo di sale (considerato molecola)= 50g/moli
Se una busta di sale pesa 908,1 g e la massa molecolare é pari a 58, il numero di moli si trova facendo 908g/58moli

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On the 9 November we went to the laboratory to study the Lavoisier's theory said also law of the definitives and costants proportions. It says that two substances join together to form a compost, and their masses joined proportionally. We used a balance, many ⚗, a plastic spoon, a balloon, bicarbonate sodium and vinegar.
First we've measured the weight of everything and taken note of it. Then we have divided the experiment in two parts:
⚫Firstly we noticed that adding bicarbonate sodium in the vinegar freed carbon dioxide.

🔸Secondly we put the bicarbonate of sodium on the ballon and then put it on the test tube. We noticed that when the bicarbonate fall into the vinegar the gas went in the ballon inflating it.

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We went to he laboratory to study Proust law also called law of definite proportions, state that every chemical compound contains fixed and constant proportions (by weight) of its constituent elements.
We used 2 beckers, a balance, a pliers, a slab, a heater,  glavs, glasses, hydrochloric acid and Zinc (Zn)

1st) we weight beckers
2nd) In the frist becker we put 0,75g of Zn
3rd) in the second becker 1g of Zn
4th) Spill in the beckers 12,5 g of Hcl
5th) Heat under the cloak until the liquid part is evaporate
6th) heat more with the heater (130°C) for 15 minutes
7th) Weight beckers and subtract the mass  of beckers, we obtain the mass of salt that formed : 2nCl2.
8th) Subtract to that empiric formula the mass of used Zn we'll obtain the mass of Chlorine that has combined with different Zn masses.

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Costruisci un atomo partendo da protoni, neutroni, ed elettroni, e osserva come cambiano elemento, massa e carica. Gioca una partita per verificare le tue idee!

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(10/10/2016)
Today we went to the laboratory to try the flame test. It has been very beautiful after me because I've loved the colors that we've obtained whit the elements that the teacher has given us. We have tried with the sodium chloride, the copper chloride, the barium chloride, the potassium chlorate and the strontium nitrate. Here there are some pictures about this lovely experiment!

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My prezi presentation about atomic models.⚗🔍

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My prezi presentation about atomic models.⚗🔍

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In this presentation I speak about the most famous atomic models and their creators.