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

What is an alpha particle made of?

1. A1 proton and 1 electron
2. B2 protons and 2 neutrons
3. CA single high-energy electron
4. DPure electromagnetic energy

How is percent yield calculated?

1. A(Actual yield ÷ theoretical yield) × 100
2. B(Mass of reactants ÷ mass of products) × 100
3. C(Theoretical yield ÷ actual yield) × 100
4. DActual yield − theoretical yield

What is the SI unit of temperature?

1. ADegree Fahrenheit
2. BKelvin
3. CDegree Celsius
4. DJoule

Which coefficients balance __KClO₃ → __KCl + __O₂?

1. A2, 2, 3
2. B2, 1, 3
3. C1, 1, 1
4. D1, 1, 3

Using significant figures, what is 2,5 cm × 3,42 cm?

1. A8,6 cm²
2. B8,55 cm²
3. C8,550 cm²
4. D9 cm²

How many oxygen atoms are in one formula unit of calcium nitrate, Ca(NO₃)₂?

1. A3
2. B2
3. C6
4. D5

A sealed bag of crisps (potato chips) packed at sea level looks puffed up when it is carried to a high mountain. Why?

1. AMore gas is produced by the crisps at altitude
2. BThe bag becomes thinner and weaker at altitude
3. CThe gas inside the bag is heated strongly by the mountain sunlight
4. DThe outside air pressure is lower, so the gas inside expands

What is the percentage by mass of nitrogen in ammonium nitrate, NH₄NO₃ (N = 14, H = 1, O = 16; molar mass 80 g/mol)?

1. A35%
2. B28%
3. C17,5%
4. D60%