lấy 20 giọt dung dịch na2s2o3 1%. lấy vào ống khác 10 giọt na2s2o3 1% và 10 giọt nước cất. cùng một lúc nhỏ vào hai ống , mỗi ống một giọt h2so4 2N. lắc đều và nhận xét xem ống nào đục trước

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]

If the standard reduction potential of a half-cell is positive, which redox reaction is spontaneous when paired with a hydrogen electrode? reduction both reduction and oxidation neither reduction nor oxidation oxidation