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

What does the subscript 2 in H₂O tell you?

1. AThere are two water molecules
2. BWater has a charge of 2
3. CEach molecule contains two oxygen atoms
4. DEach molecule contains two hydrogen atoms

What is an alpha particle made of?

1. A2 protons and 2 neutrons
2. BA single high-energy electron
3. CPure electromagnetic energy
4. D1 proton and 1 electron

In a chemical reaction, what is the limiting reactant?

1. AThe catalyst that controls the speed
2. BThe reactant that runs out first and stops the reaction
3. CThe reactant with the largest mass
4. DThe reactant that is left over at the end

Що робить буферний розчин?

1. AПрискорює реакції нейтралізації, щоб pH швидко досягло рівно 7
2. BПідтримує сталу температуру розчину
3. CПротидіє змінам pH, коли додають трохи кислоти чи основи
4. DПеретворює будь-яку кислоту на сильну основу

How does ionisation energy (the energy needed to remove an outer electron) generally change from left to right across a period?

1. AIt decreases
2. BIt first falls, then rises sharply
3. CIt increases
4. DIt stays the same

Which measurement has three significant figures?

1. A0,0056
2. B56
3. C5,0006
4. D0,00560

The true volume in a flask is 10,0 mL. A student measures it three times and gets 8,1 mL, 8,1 mL and 8,2 mL. How are these results best described?

1. ANeither accurate nor precise
2. BBoth accurate and precise
3. CPrecise but not accurate
4. DAccurate but not precise

In the fission reaction ²³⁵U + ¹n → ¹⁴¹Ba + ⁹²Kr + ? ¹n, how many neutrons are released?

1. A3
2. B1
3. C4
4. D2