Робочий аркуш «Хімія для вступних іспитів на медсестринство» з відповідями

Which is a sign that a chemical reaction may have taken place?

1. ASugar dissolves completely when stirred into water
2. BA gas is produced when two liquids are mixed
3. CA block of wax melts when it is heated
4. DWater freezes into ice when put in a freezer

In a solution, what is the solvent?

1. AAny solid that will not dissolve, however long it is stirred
2. BThe substance that does the dissolving, usually present in the larger amount
3. CThe substance that is dissolved, usually present in the smaller amount
4. DThe gas given off when a solid dissolves

Which property is typical of nonmetals?

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

To which family of organic compounds does ethanol, C₂H₅OH, belong?

1. AEsters
2. BAlcohols
3. CAlkanes
4. DCarboxylic acids

A piece of metal has a density of 8 g/cm³ and a volume of 5 cm³. What is its mass?

1. A40 g
2. B0,625 g
3. C1,6 g
4. D13 g

Why does ice float on liquid water?

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

How many atoms in total are in 0,5 mol of water, H₂O?

1. A6,02 × 10²³
2. B9,03 × 10²³
3. C3,01 × 10²³
4. D1,81 × 10²⁴

Змішують однакові об'єми 1 M HCl і 1 M NaOH. Яке приблизно pH отриманого розчину?

1. A14
2. B1
3. C3,5
4. D7