Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

In a chemical equation, what does the symbol (aq) after a formula mean?

1. AA gas
2. BA solid
3. CA pure liquid
4. DDissolved in water

Which technique is used to separate the different coloured dyes in an ink?

1. AFiltration
2. BMagnetism
3. CDistillation of the ink
4. DChromatography

Where do the mole ratios used in stoichiometry come from?

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

A bag of 5% (w/v) glucose solution (called 5% dextrose in the US) contains 5 g of glucose per 100 mL. How many grams of glucose are in 1 L?

1. A0,5 g
2. B50 g
3. C500 g
4. D5 g

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

Potassium forms K⁺ ions and sulfur forms S²⁻ ions. What is the name and formula of their compound?

1. APotassium sulfide, K₂S
2. BPotassium sulfite, KS
3. CPotassium sulfate, K₂SO₄
4. DPotassium sulfide, KS₂

Which list puts 0,1 M solutions of HCl, acetic acid (CH₃COOH) and NaCl in order of increasing pH?

1. ANaCl < CH₃COOH < HCl
2. BHCl < NaCl < CH₃COOH
3. CCH₃COOH < HCl < NaCl
4. DHCl < CH₃COOH < NaCl

Carbon-12 and carbon-14 react in exactly the same way in chemical reactions. Why?

1. AThey have the same number of protons and electrons
2. BThey have the same mass number
3. CThey have the same number of neutrons
4. DCarbon-14 turns into carbon-12 before reacting