Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

Kaip druskos tirpale vadinama druska?

1. ATirpinys (ištirpusi medžiaga)
2. BNuosėdos
3. CKatalizatorius
4. DTirpiklis

A food Calorie (written with a capital C) equals which amount of energy?

1. A1 kilocalorie
2. B1 joule
3. C1 kilojoule (1000 J)
4. D1 calorie

According to the kinetic molecular theory, how do gas particles move?

1. AOnly when heated, and then in neat lines between the walls
2. BSlowly in fixed positions
3. CConstantly, randomly and in straight lines between collisions
4. DAlways in a single direction, set by the pull of gravity

Kas yra sotusis tirpalas?

1. ATirpalas, kuriame nedaug tirpinio ištirpę dideliame tirpiklio kiekyje
2. BTirpalas, kuriame visai nėra tirpiklio
3. CTirpalas, kuris nepraleidžia elektros
4. DTirpalas, kuriame ištirpę tiek tirpinio, kiek gali ištirpti toje temperatūroje

Why does ice float on liquid water?

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

A bag of 5% (w/v) glucose solution (called 5% dextrose in the US) contains 5 g of glucose per 100 mL. How many grams of glucose are in 1 L?

1. A500 g
2. B5 g
3. C0,5 g
4. D50 g

At the top of a high mountain, air still contains about 21% oxygen. Why do climbers still get less oxygen with each breath?

1. AOxygen is heavier, so it all sinks to sea level
2. BThe total air pressure is lower, so the partial pressure of oxygen is lower
3. CThe percentage of oxygen in the air falls sharply as you climb higher
4. DCold air contains no oxygen

In Rutherford's gold foil experiment, most alpha particles passed straight through the foil but a few bounced back. What did this show?

1. AAtoms are solid, indivisible spheres
2. BElectrons move in fixed circular orbits
3. CElectrons are spread evenly through a positive "pudding"
4. DAn atom is mostly empty space with a small, dense, positive nucleus