Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

What causes the pressure of a gas in a container?

1. AGas particles sticking to the walls
2. BThe weight of the container pressing on the gas inside
3. CGas particles colliding with the container walls
4. DGas particles stopping and pushing outward

Kuris iš šių pokyčių yra cheminis?

1. ALedo tirpimas
2. BCukraus tirpimas arbatoje
3. CStiklo dūžimas
4. DMedienos degimas

Which property is typical of nonmetals?

1. AThey easily lose electrons to form positive ions
2. BThey are all solids at room temperature
3. CThey are shiny and easily bent into wires
4. DThey are poor conductors of heat and electricity

How does electronegativity change going down a group?

1. AIt increases
2. BIt doubles with each period
3. CIt decreases
4. DIt stays the same

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

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

Why does ice float on liquid water?

1. AIce has a higher mass than the same volume of water
2. BIce contains trapped air from the freezer
3. CIce is denser than liquid water
4. DIce is less dense than liquid water

Balione yra 2,0 L dujų 300 K temperatūroje. Esant pastoviam slėgiui jis pakaitinamas iki 450 K. Koks naujas tūris?

1. A2,0 L
2. B3,0 L
3. C1,3 L
4. D4,5 L

Why does food cook faster in a pressure cooker?

1. AThe higher pressure raises the boiling point, so the water is hotter
2. BPressure itself breaks down the food, regardless of temperature
3. CThe higher pressure lowers the boiling point
4. DSteam is trapped, so the water boils at a lower temperature