Answer:
The cube of gold will have the greatest mass.
Explanation:
All the cubes have the same size, so they have the same volume.
The property that varies among the cubes is density.
D = m/V Multiply both sides by V and transpose.
m = DV
Since V is a constant, m ∝ D.
That is, the cube with the greatest density will have the greatest mass.
The observed densities are
Iron = 7.9 g/cm³
Brass = 8.5 g/cm³
Lead = 11.4 g/cm³
Gold = 19.3 g/cm³
Gold has the greatest density, so the cube of gold has the greatest mass.
Answer:
29.39% of AlCl₃ in the sample
Explanation:
Based on the reaction:
MnO₂(s) + 2Cl⁻ + 4H⁺ → Mn²⁺ + Cl₂(g) + 2H₂O
We can find the amount of chloride in solution with the amount of MnO₂ that reacted as follows:
<em>Initial mass MnO₂ = 0.6467g</em>
<em>Recovered mass = 0.3104g</em>
Mass that reacted = 0.6467g - 0.3104g = 0.3363g
<em>Moles MnO₂ -Molar mass: 86.9368g/mol-:</em>
0.3363g * (1mol / 86.9368g) = 3.868x10⁻³ moles MnO₂
<em>Moles Cl⁻:</em>
3.868x10⁻³ moles MnO₂ * (2mol Cl⁻ / 1mol MnO₂) = 7.737x10⁻³ moles Cl⁻
<em>Moles of AlCl₃ and mass -Molar mass AlCl₃: 133.34g/mol-:</em>
7.737x10⁻³ moles Cl⁻ * (1mol AlCl₃ / 3mol Cl⁻) = 2.579x10⁻³ moles AlCl₃
2.579x10⁻³ moles AlCl₃ * (133.34g / mol) =
<em>0.3439g of AlCl₃</em> are present in the sample.
The percent is:
0.3439g of AlCl₃ / 1.1701g * 100 =
<h3>29.39% of AlCl₃ in the sample</h3>
Deductive reasoning involves making broad observations and examining possibilities to reach a specific, logical conclusion, which is required in the formation of a hypothesis. Conversely, inductive reasoning involves taking specific observations and making broad generalisations from these. Therefore the answer is A.
Hope this helps!
Answer: 1. C. polar covalent: electrons shared between silicon and sulfur but attracted more to the sulfur
2. B) 
3. B) Fluorine
Explanation:
1. A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms.
Electronegativity difference = electronegativity of sulphur- electronegativity of silicon = 2.5 -1.8 = 0.7
Thus as electronegativity difference is less than 1.7 , the cond is polar covalent and as electronegativity of sulphur is more , the electrons will be more towards sulphur.
2. A molecular compound is usually composed of two or more nonmetal elements. Example:
Ionic compound is formed by the transfer of electrons from metals to non metals. Example: 
, 
and 
3. For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here K is having an oxidation state of +1 and as the compound formed is KZ, the oxidation state of non metallic element Z should be -1. Thus the element Z is flourine which exists as diatomic gas 
