Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

Which technique is used to separate the different coloured dyes in an ink?

1. AChromatography
2. BDistillation of the ink
3. CFiltration
4. DMagnetism

Natris ir kalis priklauso kuriai grupei?

1. AHalogenams (17 grupė)
2. BŠarminiams metalams (1 grupė)
3. CŠarminiams žemės metalams (2 grupė)
4. DTauriosioms dujoms (18 grupė)

What is the name of the polyatomic ion NH₄⁺?

1. AAmmonia
2. BAmmonium
3. CNitride
4. DNitrate

Kaip aukštesnė temperatūra paprastai veikia, kiek kietosios medžiagos ištirpsta vandenyje?

1. AKietosioms medžiagoms įtakos neturi
2. BIštirpsta mažiau kietosios medžiagos
3. CKietoji medžiaga virsta dujomis
4. DIštirpsta daugiau kietosios medžiagos

A reaction has a theoretical yield of 20 g, but only 15 g of product is collected. What is the percent yield?

1. A133%
2. B75%
3. C25%
4. D5%

A gas mixture contains nitrogen at 600 mmHg, oxygen at 150 mmHg and other gases at 10 mmHg. What is the total pressure?

1. A600 mmHg
2. B750 mmHg
3. C253 mmHg
4. D760 mmHg

A scuba diver breathes compressed air deep underwater. Why must the diver breathe out while swimming up to the surface?

1. AOxygen turns to liquid at the surface
2. BThe water gets warmer near the surface
3. CThe air in the lungs expands as the outside pressure falls
4. DThe air in the lungs shrinks as the outside pressure falls

5,85 g of NaCl (molar mass 58,5 g/mol) is dissolved to make 500 mL of solution. What is the molarity?

1. A0,1 M
2. B0,05 M
3. C0,2 M
4. D2 M