Zadanie 1e
Most oxide ions are . (i) State the number of protons, neutrons and electrons in this ion. (ii) Some oxide ions are . State the term that describes the relationship between and . (iii) The…
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Most oxide ions are . (i) State the number of protons, neutrons and electrons in this ion. (ii) Some oxide ions are . State the term that describes the relationship between and . (iii) The…
Atoms were once thought to be the smallest particles of matter, impossible to divide. Suggest two pieces of evidence that show an atom has an internal structure.
State the type of bonding in calcium, nitrogen and calcium nitride, and how the valence electrons produce each type of bonding.
A student mixes 100 cm3 of 0.50 mol dm−3 calcium chloride solution with 150 cm3 of 1.00 mol dm−3 potassium chloride solution. What is the concentration of chloride ions, in mol dm−3, in…
Determine the coefficients needed to balance the equation for the reaction between sodium and water. Na(s) + H2O(l) → NaOH(aq) + H2(g)
A 0.460 g piece of sodium was placed in 250.0 cm3 of water. (i) Calculate the molar concentration of the sodium hydroxide solution formed. Assume that the volume of the solution is 250.0 cm3. (ii) Calculate the volume of hydrogen gas…
Identify the oxidizing agent in the reaction of sodium with water and justify your answer in terms of oxidation states.
Describe two observations, other than the formation of gas bubbles, that would show that the reaction of sodium with water is exothermic.
A 0.030 mol sample of magnesium is added to 20.0 cm3 of hydrochloric acid of concentration 1.0 mol dm−3. Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) How many moles of hydrogen gas are produced? A. 0.010 B. 0.020 C. 0.030 D. 0.060
Suggest an experiment that shows that zinc is more reactive than copper, giving the observation that would confirm this.