155 / 5000 Có hai điện tích q1 và q2 đặt cách nhau 20cm tại hai điểm a và b. Biết q1 = -9uC, q2 = 4uC. Tìm vị trí M tại đó điện trường bằng không.

Iron reacts with sulfur to form iron sulfide. if 60 grams of iron reacts with sulfur to produce 90 grams of iron sulfide, how much sulfur has been used in the chemical reaction?

An object's buoyant force and weight mean the same thing. a. trueb. false

According to valence bond theory, which orbitals overlap in the formation of the bond in hf according to valence bond theory, which orbitals overlap in the formation of the bond in hf 2s on h and 2p on f 1s on h and 2s on f 1s on h and 1p on f 1s on h and 2p on f 1s on h and 3p on f