Lembar kerja Kimia untuk ujian masuk keperawatan dengan jawaban

Where do the mole ratios used in stoichiometry come from?

1. AThe subscripts in each formula
2. BThe physical states of the substances
3. CThe coefficients of the balanced equation
4. DThe molar masses of the reactants

What is a solution?

1. AA pure compound made of two elements
2. BA solid that has been melted
3. CA mixture in which particles settle out on standing
4. DA mixture that is the same throughout (homogeneous)

What is absolute zero?

1. A−100 °C, the coldest temperature on Earth
2. B0 K, about −273 °C, the lowest possible temperature
3. C0 °F, the temperature of a salt and ice mixture
4. D0 °C, the point at which pure water freezes into ice

On an energy diagram, the products are at a lower energy than the reactants. What kind of reaction is shown?

1. AReversible only
2. BExothermic
3. CNuclear
4. DEndothermic

Why must temperatures be in kelvin in gas law calculations?

1. AThe kelvin scale has smaller degrees, which gives more precise answers
2. BGas volume and pressure are proportional to the absolute temperature
3. CKelvin values are always below 100
4. DCelsius can only be used for liquids

How much heat is needed to raise the temperature of 100 g of water by 10 °C (specific heat of water = 4,18 J/g·°C)?

1. A4180 J
2. B418 J
3. C41,8 J
4. D41,800 J

Ketika gula larut dalam air, mengapa itu bukan perubahan kimia?

1. AGula dimusnahkan dan digantikan oleh air
2. BMolekul gula tetap gula dan dapat diperoleh kembali
3. CKalor selalu dilepaskan saat gula larut
4. DGula bereaksi dengan air membentuk senyawa baru

Which substance has the lowest boiling point?

1. AWater
2. BSodium chloride
3. CIron
4. DHelium