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States of matter

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Wordlink is a facility which links webpages word-by-word to online dictionaries

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Penitentes form when the sun’s rays turn snow directly into water vapor without melting it first, a process called sublimation. An initially smooth snow surface first develops depressions as some regions randomly sublimate faster than others. The curved surfaces then concentrate sunlight and speed up sublimation in the depressions, leaving the higher points behind as forests of towering spikes. At the micro-scale, similar-looking spikes help solar cell surfaces maximize their sunlight absorption.

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Si riscaldano per 20 minuti 500cm ³ di acqua inizialmente a 20°C per mezzo di un fornello capace di fornire 240cal/s. Sapendo che il 20% del calore fornito viene assorbito dal recipiente e dall’ambiente esterno e solo l’80% va effettivamente a riscaldare la massa d’acqua, calcola quanta acqua contiene il recipiente dopo i 20 minuti e quanto tempo sarebbe necessario per far evaporare completamente l’acqua.

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Scegli per ciascuna risposta l'alternativa corretta. Quando hai completato l'esercizio, clicca su Conferma.

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capitolo 8 - I cambiamenti di fase - Bovolenta multimedia

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Passaggi di stato: fusione e solidificazione, vaporizzazione, liquefazione e condensazione, sublimazione; stasi termica; calore latente. Influenza della pressione sui passaggi di stato.

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DO YOU SPEAK PHYSICS? HEAT CURVE PROBLEMS

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DO YOU SPEAK PHYSICS? HEAT CURVE PROBLEMS

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1. How much heat is needed to warm 25 grams of water from 10 °C to 20 °C?

2. How much heat is needed to warm 25 grams of water from -10 °C to 20 °C

3. What is the specific heat of copper metal if 200 cal increases the temperature of 40.9 g of it from 21 °C to 73 °C

4. How much heat is needed to increase the temperature of 12 grams of gold from 20 °C to 95 °C?

5. 5. What is the temperature of 40 grams of water at 45 °C added to 60 grams of water at 95 °C?

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cambiamenti stato esercizi fisica liceo scientifico

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Esercizi di Fisica: cambiamenti di stato

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Esercizi risolti sui cambiamenti di stato per studenti del secondo anno di liceo scientifico.

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Come funziona una pentola a pressione? Come fa a cuocere i cibi più velocemente?

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Come funziona una pentola a pressione? Come fa a cuocere i cibi più velocemente?

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Why does ice float in water? - George Zaidan and Charles Morton

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View full lesson: http://ed.ted.com/lessons/why-does-ice-float-in-water-george-zaidan-and-charles-morton Water is a special substance for several reasons, and you may have noticed an important one right in your cold drink: ice. Solid ice floats in liquid water, which isn't true for most substances. But why?

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Pouring a Thermos of Hot Tea at -40°C Near the Arctic Circle

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Pouring a Thermos of Hot Tea at -40°C Near the Arctic Circle

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VIDEO 3: turning water into ice with a push

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VIDEO 3: turning water into ice with a push

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Spiega cosa fa passare l'acqua dallo stato liquido allo stato solido in questo esperimento e in quali condizioni si verifica il fenomeno

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Happened to find out that our water that has been sitting in the trunk of my car was really close to the triple point. Here is the video.

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VIDEO 1: lifting ice cubes with a pinch of salt

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VIDEO 1: lifting ice cubes with a pinch of salt

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Spiega perché il filo si attacca al cubetto di ghiaccio e qual è il ruolo del sale in questo esperimento

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How to... Science, Craft Plus Other DIY Fixes

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How to Stick String to Ice using Salt - Simple Science Experiment - Easy to do

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Place the ice in water, lay some string over the ice, and sprinkle on some salt. Leave in the water for a minute or two and allow the salt to slowly wash away. The salt initially melts the ice, but once washed away the water freezes around the string and attaches the string to the ice.

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VIDEO 2: changing the boiling point of water 

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VIDEO 2: changing the boiling point of water 

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Spiega come fa l'acqua a bollire e qual è il ruolo della campana a vuoto in questo esperimento

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Physics experiment: Boiling water in the vacuum pump.

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Cambiamenti di stato nel diagramma calore/temperatura

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Cambiamenti di stato nel diagramma calore/temperatura

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I cambiamenti di stato e le leggi quantitative

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I cambiamenti di stato e le leggi quantitative