Which of the following equations are correctly balanced? i. agno3 + nabr → agbr + nano3 ii. al + o2 → al2o3 iii. caco3 → 3cao + co2 iv. cu2so4 + zn → znso4 + 2cu

Five students had to answer the question how are elements arranged in a periodic tabledamon: i think the elements are arranged by increasing massflo: i think the elements are arranged according to their properties sienna: i think the elements are arranged by when their discovers kyle: i think the elements are arranged according to how common they areglenda: i don't agree with any of themwho is right

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread