Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

Which of these is a polyatomic ion?

1. ASodium, Na⁺
2. BOxide, O²⁻
3. CChloride, Cl⁻
4. DSulfate, SO₄²⁻

Sūrus vanduo yra kokios materijos pavyzdys?

1. AHeterogeninio mišinio
2. BHomogeninio mišinio (tirpalo)
3. CJunginio
4. DGryno elemento

Koks ryšys susidaro, kai atomai dalijasi elektronais?

1. AMetalinis ryšys
2. BKovalentinis ryšys
3. CJoninis ryšys
4. DBranduolinis ryšys

At 20 °C, about 36 g of NaCl dissolves in 100 g of water. If 50 g of NaCl is stirred into 100 g of water at 20 °C, what happens?

1. AAbout 36 g dissolves and about 14 g stays undissolved
2. BAll 50 g dissolves
3. CNone of the salt dissolves
4. DAbout 14 g dissolves and about 36 g stays undissolved

For the gas reaction N₂ + 3H₂ ⇌ 2NH₃, what is the effect of increasing the pressure?

1. AThe equilibrium shifts to the right, toward NH₃
2. BThe NH₃ breaks down completely
3. CThere is no effect on the equilibrium
4. DThe equilibrium shifts to the left, toward N₂ and H₂

Koks yra natrio atomo (11 elektronų) elektronų išsidėstymas?

1. A2, 8, 1
2. B2, 9
3. C2, 8, 2
4. D8, 2, 1

Dujos yra 1 atm slėgio 6 L inde. Esant tai pačiai temperatūrai jos suspaudžiamos iki 2 L. Koks naujas slėgis?

1. A0,33 atm
2. B4 atm
3. C3 atm
4. D12 atm

Why is Dmitri Mendeleev's early periodic table regarded as such a success?

1. AHe discovered the noble gases and placed them in group 18
2. BHe arranged the elements by atomic number, which he had discovered
3. CHe proved that the atoms of every element contain electrons
4. DHe left gaps and correctly predicted the properties of elements not yet discovered