<h2>Answer:</h2>
Correct option is B.
B. To relate the type of box material to the warmth of air within the box.
<h2>Explanation:</h2>
Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box. She actually did this to relate the type of box material to the warmth of air within the box.
Answer:
0.109 g.
Explanation:
Equation of the reaction:
Na3PO4 + 3HCl --> 3NaCl + H3PO4
Number of moles of HCl = molar concentration × volume
= 0.1 × 0.04
= 0.004 mol.
By stoichiometry, 1 mole of Na3PO4 neutralises 3 moles of HCl. Therefore, number of moles of Na3PO4 = 0.004/3
= 0.0013 mol
Mass of Na3PO4 = molar mass × number of moles
= 0.0013 × 164
= 0.219 g
Since 50% of Na3PO4 was present in the sample. Let 100 g be the total mass of the substance
= 0.219 × 50 g/100 g
= 0.109 g.
Answer: B
Explanation: The clouds act almost like a lid. Think of it like when you put tin foil over food before it goes in the oven. so that even after it is removed from the heat the tin foil traps it causing it to stay warm.
The percentage yield of the reaction : 93.3%
Mass of FeCO₃ 2310.44 g
<h3>Further explanation
</h3>
The reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products
Reaction
4 FeCO₃ + O₂ ⇒ 2 Fe₂O₃ + 4CO₂
MW FeCO₃ : 115,854 g/mol
MW Fe₂O₃ : 159,69 g/mol
![\tt \dfrac{35}{115.854}=0.302](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B35%7D%7B115.854%7D%3D0.302)
![\tt \dfrac{2}{4}\times 0.302=0.151](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B2%7D%7B4%7D%5Ctimes%200.302%3D0.151)
![\tt 0.151\times 159.69=24.113~g](https://tex.z-dn.net/?f=%5Ctt%200.151%5Ctimes%20159.69%3D24.113~g)
![\tt \dfrac{22.5}{24.113}\times 100\%=93.3\%](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B22.5%7D%7B24.113%7D%5Ctimes%20100%5C%25%3D93.3%5C%25)
mol of 1 kg Fe₂O₃ = 1000 g
![\tt \dfrac{1000}{159.69}=6.262](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B1000%7D%7B159.69%7D%3D6.262)
mol of FeCO₃
![\tt \dfrac{4}{2}\times 6.262=12.524](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B4%7D%7B2%7D%5Ctimes%206.262%3D12.524)
mass of FeCO₃
![\tt 12.524\times 115.854=1450.955~g](https://tex.z-dn.net/?f=%5Ctt%2012.524%5Ctimes%20115.854%3D1450.955~g)
a purity of 62.8%
![\tt \dfrac{100}{62.8} \times 1450.955=2310.44~g](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B100%7D%7B62.8%7D%20%5Ctimes%201450.955%3D2310.44~g)
Answer:
Dissolve benxioc acid and benzaldehyde in organic solvent. The two compounds are not miscible.with water. Put the two in separating funnel. Then use aqueous sodium bicarbonate to extract. Benzioc acid will be in aqueous layer as benzioate ion. Benzaldehyde remain insoluble and can be isolated.
Explanation:
Extractions are techniques use to separate desired compounds when mixed together. The mixture is brought in contact with solvent in which the sites substance is soluble and other is insoluble. Extractions use imissicible stages to separate substance from another.