Химия для вступительных экзаменов на сестринские программы: лист заданий с ответами

An instant cold pack feels cold when the substance inside dissolves. How is this dissolving process classified?

1. AA neutralisation reaction
2. BA combustion reaction
3. CEndothermic
4. DExothermic

Which type of radiation is the most penetrating?

1. ABeta particles
2. BThey are all equally penetrating
3. CAlpha particles
4. DGamma rays

Какая частица атома имеет положительный заряд?

1. AНейтрон
2. BФотон
3. CПротон
4. DЭлектрон

Какое утверждение описывает сильную кислоту?

1. AЕё pH выше 7
2. BОна всегда сильно концентрирована
3. CОна лишь частично высвобождает ионы водорода
4. DОна полностью ионизируется в воде

What is carbon-14 dating used for?

1. AMeasuring body temperature
2. BFinding the exact age of rocks that are billions of years old
3. CDetecting carbon monoxide in a room
4. DEstimating the age of material that was once alive

When diluting a concentrated acid, which method is safe?

1. AAdd the water quickly to the acid
2. BAdd the acid slowly to the water
3. CMix them in any order, as long as it is fast
4. DAdd the water slowly to the acid

2090 J of heat is added to 50 g of water (specific heat 4,18 J/g·°C). By how much does its temperature rise?

1. A20 °C
2. B10 °C
3. C41,8 °C
4. D5 °C

Using PV = nRT with R = 0,082 L·atm/(mol·K), how many moles of gas are in 24,6 L at 1 atm and 300 K?

1. A1 mol
2. B2 mol
3. C0,5 mol
4. D300 mol