Stabileste daca propietatile substantelor din enunturi sunt fizzice sau chimice. a) Apa se descompune in doua subst gazoase , oxigen si hidrogen, cu ajutorul curentului electric. b)Heliul, gazul folosit la umplerea baloanelor, este de 14,45 ori mai usor decar aerul. c)Oxigeul se dizolva partial in apa, fapt dovedit prin existenta vietii subacvactice d)Dioxidul de carbon nu arde si nu intertine arderea, de accea se foloseste la producerea unor stringatoare de incendiu

Describe the interaction that occurs between two objects with the same electrical charge.

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?