cho 7,35 gam hỗn hợp gồm kim loại kiềm A và Kali tác dụng với nước . để trung hòa dung dịch thu được cần 0,25 mol HCl vậy A là ?

Agood hypothesis includes which of the following? a: prediction b: data c: uncertainty d: conclusion

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.