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Questions in chemistry

[Terjawab] Describe the following states of matter (solid, liquid, and gas) according to their: 1. Properties 2. Arrangement of particles 3. Motion of particles

[Terjawab] Determine the polarity (polar or nonpolar) and the type of intermolecular forces of attraction (IMFA) for the following compounds: | Compound | Polarity (Polar or Nonpolar) | Type of IMFA | |---|---|---| | H₂O (water) | polar | H-bonding | | XeF₄ (xenon tetrafluoride) | | | | Acetone | | | | O₃ (ozone) | | | | SF₆ (sulfur hexafluoride) | | | | H-C≡N: (hydrogen cyanide) | | | Molecular structures: Water: H-O-H Acetone: H-C-C-C-H Ozone: O=O-O Xenon tetrafluoride: F-Xe-F | F | F Sulfur hexafluoride: F-S-F | F | F Hydrogen cyanide: H-C≡N

[Terjawab] The number of protons, on the other hand, has remained the same. How many protons are present in the nucleus of chlorine, whether it is in its elemental state or an ionic state?

[Terjawab] Which of the following reactions shows a physical change? A. [tex]$H _2(g)+ O _2(g) \rightarrow H _2 O ( l )$[/tex] B. [tex]$2 AgNO _3(a q)+ CaBr _2(a q) \rightarrow 2 AgBr (s)+ Ca \left( NO _3\right)_2(a q)$[/tex] C. [tex]$2 CH _3 OH ( l )+3 O _2(g) \rightarrow 2 CO _2(g)+4 H _2 O ( l )$[/tex] D. [tex]$NaCl (s) \rightarrow NaCl (a q)$[/tex]

[Terjawab] Phosphine (PH3) decomposes at elevated temperatures, yielding gaseous P2 and H2: 2 PH3(g) ⇌ P2(g) + 3 H2(g) Kp = 398 at 873 K If the initial partial pressures are PPH3 = 0.0271 atm, PP2 = 0.863 atm, PH2 = 0.514 atm, calculate Qp. Qp =

[Terjawab] The glass transition (Tg) value of the following polymers: -[-S-]- CH3 -[-O-C-C-O-CO-]- CH3 -[N-CO-CO-N-O-]- PI, polyimide, PPS, polyphenylenesulfide, PC, polycarbonate, Which of the following is correct? a. PI > PC > PPS b. PPS > PC > PI c. PPS = PC > PI d. PI = PPS > PC

[Terjawab] Describe how you can separate a mixture of coffee grains and water?

[Terjawab] 1. Discuss NFTF. 2. A sample of ammonia (NH3) has a molality of 1.6 molal and density of 0.9 g/mL. Calculate the %w/w of NH3. (C3) 3. Wine has a typical alcohol content of 12% (%v/v). If the alcohol volume is 24 mL, what is the volume of wine? (C3)

[Terjawab] What has the same mass as 0.25 mol of copper atoms? A. 0.5 mol of oxygen molecules B. 1 mol of sulphur dioxide molecules C. 1.5 mol of water molecules D. 2 mol of oxygen atoms

[Terjawab] Which reaction shows that the enthalpy of formation of $CS _2$ is $\Delta H_f=89.4$ $kJ / mol$? A. $C (s)+2 S(s) \rightarrow CS _2(1)$ B. $C (s)+2 S(s)+894 kJ \rightarrow CS _2(t)+89.4 kJ$ c. $C (s)+2 S(s)+89.4 kJ \rightarrow CS _2(t)$ D. $C (s)+2 S(s) \rightarrow CS _2(\jmath)+89.4 kJ$