Kimyo

Hozirgi kunda davriy sistemada nechta element mavjud?

• 117

• 118

• 120

Atmosfera havosi tarkibida necha foiz kislorod bor?

• 21%

• 78%

• 99%

Kislorodni kim kashf qilgan?

• Kavendish

• K.Shele

• Lavuarye

Fotosintez jarayonida atmosferaga qaysi gaz ajralib chiqadi?

• N(2)

• H(2)

• O(2)

Avogadro soni nechaga teng?

• 6.02*10^23

• 6.02*10^20

• 22.4*10^23

Kalsiy karbonatning formulasini toping?

• CaCO(3)

• K(2)CO(3)

• H(2)CO(3)

Suyuq holatdan gaz holatiga o'tish nima deb ataladi?

• Qotish

• Cho'kish

• Bug'lanish

Atom yadrosi qanday zarrachalardan iborat?

• Proton, elektron

• Proton, neytron

• Elektron, neyrton

Alanga necha qismdan iborat?

• 3

• 2

• 4

Ozonning tuzilishi va xossalarini qaysi olim aniqlagan?

• Farodey

• Fridrix Shenbeyn

• Lomonosov