Lembar kerja Kimia untuk ujian masuk keperawatan dengan jawaban

How is percent yield calculated?

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

Golongan mana yang berisi gas mulia, seperti helium dan neon?

1. AGolongan 18
2. BGolongan 1
3. CGolongan 17
4. DGolongan 2

How many electrons are shared in a double covalent bond?

1. A2
2. B6
3. C8
4. D4

Why does the vapour pressure of a liquid increase as it is heated?

1. AThe molecules become heavier and press harder on the surface
2. BMore molecules have enough energy to escape into the gas phase
3. CThe liquid's volume decreases and squeezes out vapour
4. DThe attractions between the molecules become stronger

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

1. A2
2. B6
3. C3
4. D5

A plastic block has a density of 0,8 g/cm³. What happens when it is placed in water (density 1,0 g/cm³)?

1. AIt sinks
2. BIt dissolves
3. CIt stays suspended halfway down
4. DIt floats

How does a rise in temperature affect how much carbon dioxide gas can dissolve in a soft drink?

1. AMore gas dissolves, so warm drinks stay fizzy for longer
2. BTemperature has no effect on gas solubility
3. CLess gas dissolves, so warm drinks go flat faster
4. DThe gas turns into a solid at higher temperature

Why is Dmitri Mendeleev's early periodic table regarded as such a success?

1. AHe left gaps and correctly predicted the properties of elements not yet discovered
2. BHe discovered the noble gases and placed them in group 18
3. CHe proved that the atoms of every element contain electrons
4. DHe arranged the elements by atomic number, which he had discovered