https://padlet.com/lai_mei_kien/2T_WB_activity Activity 11.4.1 (a) From the list, identify 2 chemical reactions that can benefit our lives. Explain your answer. (b) From the list, identify 2 chemical reactions that can harm our health or the environment. Explain your answer. en-us 2022-04-07 14:36:35 UTC 2026-02-14 00:43:19 UTC hello@padlet.com https://padlet.net/icons/png/1f320.png https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147978710 harmful  
- oxidation: rusting, apple turning brown  
- combustion of fuels
- thermal decomposition 

Beneficial 
- neutralisation 
- combustion of fuels
- respiration ]]> 2022-04-19 04:10:52 UTC https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147978710 https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147980478 Harmful:
- Rusting of nails
- Releasing of harmful gases

Beneficial:
- Photosynthesis
- Eating Antacids to relieve gastric pain]]> 2022-04-19 04:12:45 UTC https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147980478 elise_yuki_sim_2024 https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147984086
beneficial chemical reactions :
combustion of fuel -> allows chemical potential energy to convert to kinetic energy and makes the car move
release of energy from food -> allows a living thing to survive and reproduce


harmful chemical reactions :
rusting of iron components -> reduces the product’s lifespan because the rust might prevent the product from performing its function
decay of an apple -> produces greenhouse gases like methane + food spoilt ]]> 2022-04-19 04:16:43 UTC https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147984086 https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147984492 (a) beneficial:
release of energy from food — gives us energy to go about our daily lives 
neutralisation of acid on teeth by toothpaste — neutralises acid bacteria on our teeth and prevents us from getting sick 

(b) harmful 
combustion of fuel — release carbon dioxide which is hardmful to the environment 
decay of an apple — eating food that has decayed can harm our health as it is not safe to eat anymore]]> 2022-04-19 04:17:11 UTC https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147984492 https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147986371 Beneficial:
1. Antacids - neutralise stomach acids 
2. Toothpaste - alkali neutralises acids on teeth
3. Release of energy from food - respiration

Harmful:
1. Oxidation of apple - turns brown - presence of oxygen
2. Rusting of iron - harmful if you touch it and damages machines - presence of oxygen]]> 2022-04-19 04:19:18 UTC https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147986371 https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147986680 harmful
- decay of an apple
- rusting of iron components
beneficial
- combustion of fuels 
- neutralisation of acid on teeth by toothpaste 
- eating antacids (alkali) to relieve access of acids in our stomach that brings discomfort (neutralisation)

]]> 2022-04-19 04:19:42 UTC https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147986680 https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147987160 beneficial:
release energy from food—> helps to give us energy
combustion of fuels— allows us to power things
neutralisation of acid on teeth by toothpaste— helps to clean the teeth and prevent decaying

harmful:
decay of an apple— releases carbon dioxide into the atmosphere, also wastes food
rusting of iron components— the iron parts will not be able to be used, and can also cause machines to fail because the rusting makes them brittle.

]]> 2022-04-19 04:20:14 UTC https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147987160 https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147988673 Beneficial effects:
Release of energy from food  - gives us energy to live. Due to oxidation, food molecules are broken down in the presence of oxygen into glucose to provide cells with energy
Neutralisation of acid on teeth by toothpaste - alkaline toothpaste neutralises the bacterial acid on our teeth to prevent cavities

Harmful effects:
Rusting of iron components - metal reacts with moisture in the air to oxidise overtime, which decreases the lifespan of metal
Combustion of fuel - fuel when burnt produces harmful gases into the environment

]]> 2022-04-19 04:21:41 UTC https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147988673 ong_kai_rui_nicole_2024 https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147989786 Beneficial chemical reactions:
Neutralisation of acid on teeth by toothpaste - helps to get rid of bacteria on your teeth
Releasing of energy from food - provides energy for cells to function

Harmful chemical reactions:
Rusting of nails - degrades strength of nails
Combustion of fuel - Can produce air pollutants such as carbon monoxide and sulfur dioxide and contribute to global warming]]> 2022-04-19 04:22:45 UTC https://padlet.com/lai_mei_kien/2T_WB_activity/wish/2147989786