Quiz 1:   Fullscreen Mode Exothermic and Endothermic Reactions Exothermic and Endothermic Reactions Chemical reactions can be classified into two main categories based on energy changes: exothermic reactions and endothermic reactions . Exothermic Reactions An exothermic reaction is one that releases energy in the form of heat to the surroundings. During this reaction, the temperature of the surroundings increases due to the energy released. A common example of an exothermic reaction is the combustion of fuels, such as methane (CH₄). The combustion reaction of methane can be written as follows: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) + ΔH Here, ΔH has a negative value, indicating that energy is released during this process. The combustion of methane in oxygen produces carbon dioxide and water, releasing about 728 kJ/mol of energy. Characteristics of Exothermic Reactions: Energy Released: Energy in the form of heat is released to the surround...

Quiz 1:   Fullscreen Mode Besaran dan Pengukuran A. Besaran Besaran adalah segala sesuatu yang dapat diukur dan dinyatakan dengan angka serta memiliki satuan tertentu. 1. Besaran Pokok Besaran pokok adalah besaran yang menjadi dasar dari besaran yang lain. Terdapat 7 besaran pokok dalam Sistem Internasional (SI): No Besaran Simbol Besaran Satuan SI Simbol Satuan SI 1 Panjang l meter m 2 Massa m kilogram kg 3 Waktu t sekon s 4 Suhu T kelvin K 5 Kuat Arus I ampere A 6 Jumlah Zat n mol mol 7 Intensitas Cahaya I candela cd 2. Besaran Turunan Besaran turunan adalah besaran yang diperoleh dari besaran pokok yang diturunkan. Beberapa contoh besaran turunan: Besaran Penjabaran Satuan Luas panjang × lebar m² Volume panjang × lebar × tinggi m³ Massa Jenis massa / volume kg/m³ Kecep...