Chemistry - 0620 CIE

Oxides

Gbogbo ọrọ náà

Oxygen reacts with almost every element to form an oxide, but those oxides do not all behave the same way. Some turn water acidic, others make it alkaline, and a few can do either. Sorting oxides by how they react with acids and bases reveals a neat pattern that follows the periodic table.

In this lesson you will learn to classify oxides as acidic or basic and link this to whether the element is a metal or a non-metal. You will also meet amphoteric oxides, the in-between cases that react with both acids and bases, such as those of aluminium and zinc, and understand why they sit on that boundary.

Ebumnobi

Classify oxides as acidic, including SO₂ and CO₂, or basic, including CuO and CaO, related to metallic and non-metallic character.
[Supplement] Describe amphoteric oxides as oxides that react with acids and with bases to produce a salt and water.
[Supplement] Classify Al O and ZnO as amphoteric oxides 2 3.

Akọmọ Ojú-ẹkọ

Oxides are everywhere: in the air we breathe, the rust on iron, the lime spread on fields and the gases that cause acid rain. Knowing whether an oxide is acidic or basic tells you how it will react and what it can be used for, and it ties directly to where its element sits in the periodic table.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Oxides. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

Which oxide is acidic? A. CaO B. CuO C. CO2 D. Na2O Answer: C
Which oxide is basic? A. SO2 B. CuO C. CO2 D. NO2 Answer: B
Which oxide is amphoteric? A. CaO B. SO2 C. Al2O3 D. CO2 Answer: C
An amphoteric oxide reacts with: A. Acids only B. Bases only C. Both acids and bases D. Neither acids nor bases Answer: C
Acidic oxides are generally oxides of: A. Metals B. Non-metals C. Noble gases D. Transition elements Answer: B