Well research shows that it's not technically a chemical change. you need to find out whether you are looking for silica or to use glass changes on a molecular level when heated or if it's melted into another form (physical change). It appears that to make glass you simply melt silica into the resulting product, which is glass. there is not a chemical change or molecular change. Therefore, <u>making glass<em /></u> from sand is a <u>physical</u>, not a chemical change.
In thermal cracking, high temperatures (typically in the range of 450°C to 750°C) and pressures (up to about 70 atmospheres) are used to break the large hydrocarbons into smaller ones. Thermal cracking gives mixtures of products containing high proportions of hydrocarbons with double bonds - alkenes.
I believe copper would dissolve iron would just get the rust off of it. Copper would boil then dissolve. idk what the second part would be. Hope this helps!
Answer: Neon
Explanation: The second period involves elements with n =2 i.e. the elements have electrons in second shell. The element with filled s and p orbitals will have outer electronic configuration
Thus the element with filled orbital will be a noble gas. It will have total of 10 electrons and the element will be neon with complete outer electronic configuration will be:
Answer:
Montreal protocol is an international treaty signed by many countries across the globe to regulate the manufacturing and usage of substances like chlorofluorocarbons and to take measures to protect the ozone layer.
Explanation:
Montreal protocol was signed on 16th September 1987 and it was enforced on January 1st 1989. It was singed all the 197 countries who acknowledged the importance of restoring and protecting the ozone layer. The treaty has various articles under it like -(Article 2) Calculation of control levels to control the usage of ozone depleting substances.
some of the recent measures to reduce CFCs are:-
1. UN environment programme had released a list of products for the public that deplete the ozone layer and another list that doesn't. so that the public can make wise purchasing decisions.
2. Safe disposal of appliances like ACs, refrigerator and coolers that contain CFCs
3. Different policies are made by the UN environmental protection agency and organisations like national resource defense council to regulate and reduce the production and usage of CFCs.