Câu 4. Tính pH của các dd sau: (a) 400 ml dung dịch A chứa 1, 46 gam HCl
(b) 200 ml dung dịch B có hòa tan 0, 8 gam NaOH
(c) Trộn 150 ml dd H2SO4 0, 2M và 50 ml dd HCl 0, 04M
(d) Trộn 80 ml dd KOH 1M và 30 ml dd Ba(OH)2 1, 5M

Solar energy is energy from the sun that is converted into thermal or energy. a. nuclear b. mechanical c. electrical d. chemical

Of the groups of elements below, which are most likely to gain electrons to become anions? a. alkali metal b. boron group c. halogen d. transition metal

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)