Nam có 10 cái kẹo, Năm ăn mất 2 cái kẹo. Hỏi vận tốc tương đối của viên kẹo khi đi chuyển trong thực quản của Nam là bao nhiêu, biết trong miệng của Nam có chứa En-din-lim-pa-za.

Which of the following statements is not true? • a. covalent compounds have low melting and boiling points. • ob. covalent bonds between atoms of a compound are relatively weak compared to bonds between molecules. • c. covalent bonds occur between nonmetals. • d. covalent compounds are often gases or liquids.

A6.10 m nacl can be made by adding [x]g of nacl to a container and making the volume of water up to the 1.00 l line

Explain why pure hydrogen cyanide does not conduct electricity, but become a conductor when it is dissolved in water? (at room temp, pure hcn exists as a volatile liquid)