Glossary entry (derived from question below)
English term or phrase:
gas hob
Portuguese translation:
cooktop
English term
Brazil
Experienced and reliable translator
Native in: Portuguese 
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English
gas hob
Avonite (or similar) worktop
3-zone gas hob with flame-failure device
Single rectangular stainless-steel sink with Monobloc mixer tap
Microwave/conventional oven with grill
Proposed translations
Brazil
Brazilian lawyer - 40+ years in Brazil
Native in: English (Variants: Scottish, British, UK, Irish, US, Australian, Canadian, New Zealand) 
, Portuguese (Variants: Brazilian, Mozambican, Angolan, European/Portugal)
Works in: Portuguese to English, English to Portuguese, English, and 1 more.
cooktop
Deixe sua cozinha mais elegante e moderna e troque seu antigo fogão por um charmoso cooktop. Na Colombo você encontra diversos modelos de uma até cinco bocas, com acendimento automático, vidro temperado ou em inox.
Precisão na tradução PT(BR) - ENG.
Native in: English
Works in: Portuguese to English, English to Portuguese, English, and 1 more.
chapa a gás
http://www.americanas.com.br/produto/5465963/chapa-a-gas-90cm-inox-linhas-tradicional-edanca
Portugal
Marine Science, Medical, Sports, Tourism
Native in: Portuguese (Variant: European/Portugal)
Works in: English to Portuguese, Spanish to Portuguese, Portuguese, and 1 more.
United States
Marlene Curtis
Native in: Portuguese , English
Works in: English to Portuguese, Portuguese to English
chapa do fogão a gás
https://www.google.com/webhp?source=search_app#hl=en&sclient...
https://www.google.com/webhp?source=search_app#hl=en&sclient...
--------------------------------------------------
Note added at 3 hrs (2012-07-09 02:24:17 GMT)
--------------------------------------------------
Tal chapa é vendida separadamente.
Norway
Salvador Scofano and Gry Midttun
Engineer:Oil&Gas/Electron/Finan/Law/HSEQ
Native in: Norwegian , Portuguese
Works in: English to Portuguese, Norwegian to Portuguese, Portuguese to Norwegian, and 19 more.
fogão de mesa a gás
fogão de mesa:
http://www.google.com.br/imgres?um=1&hl=pt-BR&biw=1366&bih=5...
gas hob:
https://www.google.com.br/search?hl=pt-BR&q="gas hob"&um=1&i...
Portuguese to English, English to Portug
Native in: English
Works in: Portuguese to English, English to Portuguese
placa de fogão a gás
--------------------------------------------------
Note added at 11 hrs (2012-07-09 10:10:39 GMT)
--------------------------------------------------
http://www.custojusto.pt/Porto/Electrodomesticos/Placa Fogao...
Discussion
http://lista.mercadolivre.com.br/cooktops