https://padlet.com/maiouya175/z0vrdyp23srgxc56 Activity 1 en-us 2021-05-09 20:01:22 UTC 2026-01-09 09:30:29 UTC hello@padlet.com maiouya175 https://padlet.com/maiouya175/z0vrdyp23srgxc56/wish/1506943880 In each pair , indicate the one that represents a chemical change .

•  grinding nuts        -    roasting nuts
•  cooking an omelette -     mixing ingredients for an omelette
• filling up a gas cylinder     -     burning gas from a cylinder
• freezing meat       -       roasting meat
• chopping wood into pieces     -     burning wood in a fireplace
• backing a clay mug in an oven    -   molding a mug from wet clay
• washing mud off a fabric   -    bleaching yellowed white fabric

]]> 2021-05-09 20:33:59 UTC https://padlet.com/maiouya175/z0vrdyp23srgxc56/wish/1506943880 maiouya175 https://padlet.com/maiouya175/z0vrdyp23srgxc56/wish/1506974792
Why can some changes to substances be "reversed" while others cannot?

]]> 2021-05-09 21:01:51 UTC https://padlet.com/maiouya175/z0vrdyp23srgxc56/wish/1506974792 maiouya175 https://padlet.com/maiouya175/z0vrdyp23srgxc56/wish/1507008128  If a matter has been chemically changed, what is one thing that can never do now?]]> 2021-05-09 21:34:29 UTC https://padlet.com/maiouya175/z0vrdyp23srgxc56/wish/1507008128 maiouya175 https://padlet.com/maiouya175/z0vrdyp23srgxc56/wish/1507038790 With the celebration of UAE National Day , a lot of fireworks used to express the joyful of the day .. What kind of change happened ? Explain your answer.....]]> 2021-05-09 22:06:28 UTC https://padlet.com/maiouya175/z0vrdyp23srgxc56/wish/1507038790