Acid Alkaline indicator and pH scale

Which of the following plant extracts CANNOT be used as a natural indicator?

以下哪一項植物提取液不可以用作天然指示劑？

• Strawberry Extract 草莓提取液

• Onion Extract 洋葱提取液

• Red Cabbage Extract 紅椰菜提取液

• Blueberry Extract藍莓提取液

Which of the following substances does NOT contain alkalis?

以下哪一項不是鹼性溶液？

• Baking Soda 梳打粉

• Glass Cleaner 玻璃清潔劑

• Hair conditioner 護髮素

• Toothpaste 牙膏

Which of the following statements about red cabbage extract are correct?

以下哪些有關紅椰菜提取液的描述是正確的？

• (1) It contains pigments which change colour in the presence of an acid or an alkali.

  紅椰菜提取液中的色素會隨著酸鹼改變顔色。

• (2) It is pink in dilute hydrochloric acid.

  紅椰菜提取液在稀氫氯酸中是粉紅色的。

• (3) It is purple in dilute sodium hydroxide acid.

  紅椰菜提取液在稀氯化鈉中是紫色的。

• (4) It is Yellow in concentrated calcium hydroxide

  紅椰菜提取液在濃氫氧化鈣溶液中是紫色的。

Blue litmus paper

藍色石蕊指示劑

• is always blue

  永遠是藍色的

• will turn red when added into an acid.

  當遇到酸性溶液會轉爲紅色

• is a concentrated acid.

  是强酸

• is an animal extract.

  是動物提取液

Which of the following substances can turn blue litmus paper red?

• Apple juice

• Glass cleaner

• Black coffee

• Distilled water

Which of the following is NOT neutral?

以下哪一項并不是中性溶液？

• salt water鹽水

• sugar water糖水

• Distilled water蒸餾水

• Soap water肥皂水

Which of the following can indicate whether a substance is an acid or an alkali?

以下哪些指示劑能準確顯示物質的酸鹼值？

• Litmus paper

  石蕊試紙

• Universal Indicator

  通用指示劑溶液

• pH paper

  pH 試紙

• Blueberry extract

  藍莓提取液

Which of the following can be used to distinguish between sodium hydroxide and limewater?

以下哪些指示劑可以用於分辨氫氧化鈉溶液和石灰水？

• pH paper

  pH試紙

• Red litmus paper

  紅石蕊試紙

• Universal indicator

  通用指示劑溶液

• Blue litmus paper

  藍石蕊試紙

Which of the following colours shown by a pH paper indicates the lowest pH?

以下哪種顔色在pH試紙中顯示最低酸鹼值。

• Green 綠色

• Orange 橙色

• Red 紅色

• Yellow 黃色

Which of the following represents the pH range of acids?

以下哪個酸鹼值的範圍代表酸性？

• 0 to 6

• 0 to 7

• 0 to 14

• 8 to 14