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Dhalaalka: qaabka walxaha

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I can use the particle model to explain why substances have different melting points, and use a thermometer to measure melting points.

Muuji qoraalka
In the solid state, forces of attraction between particles hold them in fixed positions. In the liquid state, particles are held together but have enough energy to break free to move around. The stronger the force of attraction between particles in a substance, the higher its melting point. Water freezes at 0ºC, room temperature is about 20ºC and body temperature is about 37ºC. The bulb of a thermometer is made of very thin glass and is delicate.

Warqadda shaqada

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Imtixaannada

  1. 1. Waa maxay xaaladda maaddada (state of matter) ee ay qaybaha (particles) si dhow isugu xiran yihiin oo ay ku jiraan hab go'an?

    • Jawaabta saxda ah:Xaaladda adag (solid state)
    • Xaaladda dareeraha (liquid state)
    • Xaaladda gaaska (gas state)

  2. 2. Mid ka mid ah kuwan soo socda ayaa ah qalabka caadiga ah ee lagu cabbiro heerkulka (temperature)?

    • barometer (qalabka cadaadiska hawada)
    • Jawaabta saxda ah:thermometer (qalabka heerkulka)
    • ruler (xisaabta dhererka)
    • calliper (qalabka cabbiraadda dhumucda)

  1. 1. Maxaa ku dhacaya habaynta walxaha (particles) marka walax ka beddelanto xaaladda adag (solid) una guurto xaaladda dareeraha (liquid)?

    • Waxay isku habayn qaab go'an (fixed pattern)
    • Jawaabta saxda ah:Waxay ka guuraan habayn joogto ah una guuraan habayn aan kala sooc lahayn (random)
    • Waxay isku cadaadiyaan meel yar (compress)

  2. 2. Sheeg tilmaanta ugu habboon ee u qalmaysa ereyga 'habayn joogto ah' (regular arrangement)?

    • Walxuhu way isku dhex wareegi karaan si xor ah
    • Jawaabta saxda ah:Walxuhu waxay ku jiraan meelo go'an oo isu qiyaasan
    • Walxuhu waxay ku kala fidsan yihiin meel aad u kala fog

  3. 3. Sababtee ayay dhuxusha heerkulbeegga (thermometer) looga sameeyay galaas aad u khafiif ah?

    • Si ay ugu dabaalan karto biyaha
    • Jawaabta saxda ah:Si kulaylku si dhakhso ah ugu dhex maro
    • Si ay u noqoto mid midab leh
    • Si loo yareeyo kharashka samaynta

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