標題:
S.3 Chemistry (10 marks)
發問:
1. (a) Write down the chemical symbol for the following: (i) carbonic acid (ii) calcium hydrogencarbonate (iii) calcium carbonate water (iv) sodium hydroxide solution (v) sodium chloride / silver nitrate / silver chloride / sodium nitrate (vi) argon (b) Is there any chemical... 顯示更多 1. (a) Write down the chemical symbol for the following: (i) carbonic acid (ii) calcium hydrogencarbonate (iii) calcium carbonate water (iv) sodium hydroxide solution (v) sodium chloride / silver nitrate / silver chloride / sodium nitrate (vi) argon (b) Is there any chemical symbols for nitric acid? Why? 2. Dolomite is a rock. It is similar to limestone, but contains a mixture of magnesium carbonate and calcium carbonate. What should be observed when dilute hydrochloride acid is added to the rock? 3. Are the following elements? (a) phosphrous (b) sodium chloride (c) ammonia (d) Glucose (e) Sulphuric acid (f) mercury 4. Read the following information and state any visible differences between the elements and the compound formed. Properties of compounds compared with those of constituent elements: Once formed, a compound has its own physical and chemical properties. The properties are entirely different from those of the constituent elements. For example, when sodium is heated and placed in a gas jar of chloride, sodium chloride is formed. 5. Mixture in various forms: Write in each box as many examples of mixtures as you can. (hints: In the box of solid/solid (mixture), you can put down sand or other examples.) mixturesolidliquidgas solide.g. sand liquid gas 6. Scientists make predictions. Which of the following predictions, do you think, are highly reliable? (a) movement of the plants (b) occurrence of a sun eclipse (c) weather forecast (d) occurrence of an earthquake (e) tidal movement (f) eruption of a volcano 7. Planet Earth (a) Why did most people in ancient times believe that the Earth's shape was flat? (b) Give one piece of evidence to support the Earth's spherical shape.
最佳解答:
其他解答:
1. (a) (i) H2CO3 (ii) Ca(HCO3)2 (iii) CaCO3 (iv)NaOH (v) NaCl / AgNO3 / AgCl / NaNO3 (vi) Ar (b) Is there any chemical symbols for nitric acid? Why? Yes,HNO3 2. Dolomite is a rock. It is similar to limestone, but contains a mixture of magnesium carbonate and calcium carbonate. What should be observed when dilute hydrochloride acid is added to the rock? When dilute hydrochloric acid is added to rock, colourless gas formed and bubbles is given out 3. Are the following elements? (a) Yes (b) No (c) No (d) No (e) No (f) Yes 4)Solid sodium can conduct electricity but sodium chloride solid cannot 5)Solid: Alloy ,Rocks Liquid: Alchol Solution Gas: Air 7. Planet Earth (a) Why did most people in ancient times believe that the Earth's shape was flat? They Think people live on the Earth without fall away. So the Earth should be flat in order to suppour them (b) Give one piece of evidence to support the Earth's spherical shape. Durina a lunar eclipse, the shadow is round. So the Earth should be round as the lunar eclipse is form by the shadow of the Earth block the light from the sun to the moon
S.3 Chemistry (10 marks)
發問:
1. (a) Write down the chemical symbol for the following: (i) carbonic acid (ii) calcium hydrogencarbonate (iii) calcium carbonate water (iv) sodium hydroxide solution (v) sodium chloride / silver nitrate / silver chloride / sodium nitrate (vi) argon (b) Is there any chemical... 顯示更多 1. (a) Write down the chemical symbol for the following: (i) carbonic acid (ii) calcium hydrogencarbonate (iii) calcium carbonate water (iv) sodium hydroxide solution (v) sodium chloride / silver nitrate / silver chloride / sodium nitrate (vi) argon (b) Is there any chemical symbols for nitric acid? Why? 2. Dolomite is a rock. It is similar to limestone, but contains a mixture of magnesium carbonate and calcium carbonate. What should be observed when dilute hydrochloride acid is added to the rock? 3. Are the following elements? (a) phosphrous (b) sodium chloride (c) ammonia (d) Glucose (e) Sulphuric acid (f) mercury 4. Read the following information and state any visible differences between the elements and the compound formed. Properties of compounds compared with those of constituent elements: Once formed, a compound has its own physical and chemical properties. The properties are entirely different from those of the constituent elements. For example, when sodium is heated and placed in a gas jar of chloride, sodium chloride is formed. 5. Mixture in various forms: Write in each box as many examples of mixtures as you can. (hints: In the box of solid/solid (mixture), you can put down sand or other examples.) mixturesolidliquidgas solide.g. sand liquid gas 6. Scientists make predictions. Which of the following predictions, do you think, are highly reliable? (a) movement of the plants (b) occurrence of a sun eclipse (c) weather forecast (d) occurrence of an earthquake (e) tidal movement (f) eruption of a volcano 7. Planet Earth (a) Why did most people in ancient times believe that the Earth's shape was flat? (b) Give one piece of evidence to support the Earth's spherical shape.
最佳解答:
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S.3 Chemistry (10 marks) 1. (a) Write down the chemical symbol for the following: (i) carbonic acid - H2CO3 (aq) carbonic acid cannot be prepared in solid form, it is only present in aqueous state. (ii) calcium hydrogencarbonate - Ca(HCO3)2(aq) (iii) calcium carbonate water - CaCO3(s), CaCO3 does not soluble in water (iv) sodium hydroxide solution - NaOH(aq) (v) sodium chloride / silver nitrate / silver chloride / sodium nitrate - NaCl, AgNO3, AgCl(s), NaNO3 (vi) argon - Ar(g) (b) Is there any chemical symbols for nitric acid? Why? Yes, HNO3, 2. Dolomite is a rock. It is similar to limestone, but contains a mixture of magnesium carbonate and calcium carbonate. What should be observed when dilute hydrochloride acid is added to the rock? Ans: Colourless gas bubbles are evolved which turn limewater to milky then colorless again. 3. Are the following elements? (a) phosphrous (P4) - yes (b) sodium chloride (NaCl) - No, it is a compound formed by Na and Cl (c) ammonia(NH3) - No, it is a compound formed by N (nitrogen) and H (hydrogen) (d) Glucose (C6H12O6) - No, it is a compound formed by C, H and O (e) Sulphuric acid(H2SO4) - No, it is a compound formed by H, S and O (f) mercury (Hg) - Yes 4. Ans: Sodium is a shiny silvery soft metal, it burns with a golden yellow flame colour, chlorine is a greenish-yellow gas and sodium chloride is a white crystal. 5. mixture solid liquid gas solid e.g. sand, garlic salt, liquid - 75% ethanol, gas - air, town gas其他解答:
1. (a) (i) H2CO3 (ii) Ca(HCO3)2 (iii) CaCO3 (iv)NaOH (v) NaCl / AgNO3 / AgCl / NaNO3 (vi) Ar (b) Is there any chemical symbols for nitric acid? Why? Yes,HNO3 2. Dolomite is a rock. It is similar to limestone, but contains a mixture of magnesium carbonate and calcium carbonate. What should be observed when dilute hydrochloride acid is added to the rock? When dilute hydrochloric acid is added to rock, colourless gas formed and bubbles is given out 3. Are the following elements? (a) Yes (b) No (c) No (d) No (e) No (f) Yes 4)Solid sodium can conduct electricity but sodium chloride solid cannot 5)Solid: Alloy ,Rocks Liquid: Alchol Solution Gas: Air 7. Planet Earth (a) Why did most people in ancient times believe that the Earth's shape was flat? They Think people live on the Earth without fall away. So the Earth should be flat in order to suppour them (b) Give one piece of evidence to support the Earth's spherical shape. Durina a lunar eclipse, the shadow is round. So the Earth should be round as the lunar eclipse is form by the shadow of the Earth block the light from the sun to the moon
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