are the following true for the element gallium? if they are false make them true.
oxide more basic than Al203
oxide less basic than Mg(OH)2
hydroxide soluble in acid
hydroxide soluble in base
sulfide precipitates with H2S
sulfide not soluble in (NH4)2S
will form EaCl3, Ea2S3, and alum
EaCl3, Ea2S3, and alum soluble
will be discovered by spectrum
are the following true for the element scandium? if they are false make them true.
EbCl3 less volatile than AlCl3
will form Eb2O3
density of Eb2O3 = 3.5 g/cm3
ocide more basic than Al2O3
oxide less basic than Y2O3
oxide less basic than Mg(OH)2
answered later.
To determine the accuracy of the statements related to the elements gallium and scandium, we can refer to their properties and behavior as elements. Let's break down each statement and assess its validity.
For the element gallium:
1. Oxide more basic than Al2O3: False. To confirm this, we can compare the acid-base properties of gallium(III) oxide (Ga2O3) and aluminum(III) oxide (Al2O3) by reviewing their respective pKa values or studying their behavior in a basic solution. Ga2O3 is amphoteric, meaning it can act as both an acid and a base, but it is generally considered a weak base compared to Al2O3.
2. Oxide less basic than Mg(OH)2: True. To verify this, we can compare the acid-base properties of gallium(III) oxide (Ga2O3) and magnesium hydroxide (Mg(OH)2). Mg(OH)2 is a strong base, whereas Ga2O3 is a weaker base, making the statement true.
3. Hydroxide soluble in acid: False. To determine if gallium hydroxide (Ga(OH)3) is soluble in acid, we can consult solubility tables or conduct experiments. It is generally observed that Ga(OH)3 is insoluble in acid.
4. Hydroxide soluble in base: True. Gallium hydroxide (Ga(OH)3) is soluble in base due to its amphoteric nature.
5. Sulfide precipitates with H2S: True. Gallium sulfide (Ga2S3) will precipitate when reacted with hydrogen sulfide (H2S) gas.
6. Sulfide not soluble in (NH4)2S: False. Gallium(III) sulfide (Ga2S3) is soluble in ammonium sulfide ((NH4)2S), making the statement false.
7. Will form EaCl3, Ea2S3, and alum: True. Gallium chloride (GaCl3), gallium(III) sulfide (Ga2S3), and aluminum gallium sulfate [(AlGa)2(SO4)3], commonly referred to as alum, can form in various reactions involving gallium.
8. EaCl3, Ea2S3, and alum soluble: True. Both gallium chloride (GaCl3) and gallium(III) sulfide (Ga2S3) are soluble in water, while alum [(AlGa)2(SO4)3] is also soluble.
9. Will be discovered by spectrum: False. It is not accurate to say that gallium will be discovered by spectrum. Elements are typically discovered through observations, experiments, and analyses rather than simple observation of their spectral lines.
For the element scandium:
1. EbCl3 less volatile than AlCl3: True. Scandium chloride (ScCl3) is less volatile than aluminum chloride (AlCl3). This can be confirmed by comparing their boiling points or by studying their physical properties and behavior under different conditions.
2. Will form Eb2O3: True. Scandium oxide (Sc2O3) can be formed by reacting scandium with oxygen.
3. Density of Eb2O3 = 3.5 g/cm3: False. The actual density of scandium oxide (Sc2O3) is approximately 3.86 g/cm3, so the given value of 3.5 g/cm3 is not accurate.
4. Oxide more basic than Al2O3: False. Scandium oxide (Sc2O3) is generally considered less basic than aluminum oxide (Al2O3) due to the electronegativity differences between scandium and aluminum atoms.
5. Oxide less basic than Y2O3: True. Scandium oxide (Sc2O3) is less basic than yttrium oxide (Y2O3).
6. Oxide less basic than Mg(OH)2: True. Scandium oxide (Sc2O3) is less basic than magnesium hydroxide (Mg(OH)2).
Remember that some of these properties can be subject to various conditions. However, the above explanations provide general trends and observations regarding the given statements.