Explanation:
Atomic number is the number of protons, which is 17 for all chlorine atoms. Mass numbers differ due to different neutrons (18 and 20). Isotopes have same atomic number, different mass number.
Explanation:
Cement sets by hydration reactions forming C-S-H gel and Ca(OH)₂, even underwater. It's a chemical process, not drying. Gypsum controls the setting rate.
Explanation:
Biofuels are produced from biomass—recently living organisms or their metabolic byproducts. Examples: ethanol from sugarcane/corn, biodiesel from vegetable oils, biogas from organic waste. They are renewable and can reduce greenhouse gas emissions compared to fossil fuels. However, large-scale production may compete with food crops. Algae-based biofuels are also being researched.
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