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7.2 Oxides

  1. Acidic oxides

Most nonmetallic oxides are acidic oxides, such as SO2 and CO2.
When these acidic oxides are placed in water, acids will be produced. For instance,
SO2 + H2O → H2SO3 (sulfurous acid)
CO2 + H2O → H2CO3 (carbonic acid)
These oxides can react with base. For example,
CO2 + Ca(OH)2 → CaCO3 + H2O

It does not mean that all nonmetallic oxides can dissolve in water to produce an acidic solution. One example is silicon dioxide (SiO2). It cannot “dissolve” in water to form an acidic solution, but it can react with base, and the chemical equation as shown below:
SiO2 + 2NaOH → Na2SiO3 (sodium silicate) + H2O

2. Basic oxides

Most metallic oxides are basic oxides, such as CuO and CaO.
These metal oxides can react with acid to produce salt and wate. For instance,
2HCl + CuO → CuCl2 + H2O
Some oxides (most of them are alkali metals) are “soluble” and can “dissolve” water to produce hydroxide. For example,
Na2O + H2O → 2NaOH

3. Neutral oxides

Some nonmetallic oxides cannot “dissolve” in water and react with base, and they are called as neutral oxides, such as CO (carbon monoxide), NO (nitrogen(II) oxide, or nitrogen monoxide) and N2O (nitrogen(I) oxide, dinitrogen monoxide).

4. Amphoteric oxides

The meaning of term “amphoteric” is “both”. It means these oxides can react both acids and bases, such as Al2O3 and ZnO.
Al2O3 + 6HCl → 2AlCl3 + 3H2O
Al2O3 + 2NaOH → 2NaAlO2 (sodium aluminate) + H2O
ZnO + 2HCl → ZnCl2 + H2O
ZnO + 2NaOH → Na2ZnO2 (sodium zincate) + H2O

7.2 Oxides

1 / 10

Which statement describes a chemical property of aluminium oxide, Al2O3?

2 / 10

Part of the periodic table is shown.Which element forms an oxide that reacts with dilute acid to form a salt and water?

3 / 10

Nitrogen(I) oxide, N2O, nitrogen(II) oxide, NO, and carbon monoxide, CO, are all non-metal oxides.They do not react with acids or bases.Which statement is correct?

4 / 10

The results of some experiments with sulfur dioxide are shown.
Which results are correct?
 

5 / 10

Information about the solubility in water of four oxides is shown.Which oxide, when added to water, gives a solution with a pH less than pH 7.

6 / 10

Which statement about carbon monoxide and aluminium oxide is correct?

7 / 10

The positions of elements W, X, Y and Z in the periodic table are shown.

8 / 10

Which substance is a neutral oxide?

9 / 10

Carbon, copper, magnesium, sodium and sulfur can all form oxides.How many of these elements form acidic oxides?

10 / 10

Which statement about oxides is correct?

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《 “7.2 Oxides” 》 有 2 条评论

  1. hxh 的头像
    hxh

    看不懂啊，能不能弄个机翻

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    1. Chemistry Teacher (Wang J.J.) 的头像
      Chemistry Teacher (Wang J.J.)

      机翻不是你应该自己去弄的吗？😅

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