It correctly describes the male reproductive parts.
Eunice switched the stamen and the anther.
Eunice switched the filament and the stamen.
It correctly describes the female reproductive parts.
Answer:
1,100 J.
Explanation:
- The amount of heat added to a substance (Q) can be calculated from the relation:
<em>Q = m.c.ΔT.
</em>
where, Q is the amount of heat released from ethanol cooling,
m is the mass of ethanol (m = 50.0 g),
c is the specific heat of ethanol in the gas phase, since the T is cooled above the boiling point (c = 2.0 J/g °C),
ΔT is the temperature difference (final T - initial T) (ΔT = 79.0 °C – 90.0 °C = - 11.0 °C).
<em>∴ Q = m.c.ΔT</em> = (50.0 g)(2.0 J/g °C)(- 11.0 °C) = <em>- 1100 J.</em>
<em>The system releases 1100 J.</em>
Answer:
A physical property that depends on the sample size
Answer:
Option D :- check if one element replaces another element in a compound.
Explanation:
A single-displacement reaction occurs when an element replaces another element in a compound. A metal only replaces a metal, and a nonmetal only replaces a nonmetal.
Answer:
Explanation:
We must use the Nernst equation
E_{\text{cell}} = E_{\text{cell}}^{\circ} - \dfrac{RT}{zF}\ln Q
We want Ecell < 0 for a reverse reaction, so assume it is 0.
Step 1. Calculate E°cell
Anode: 3Zn ⟶ 3Zn²⁺(4 mol·L⁻¹) + 6e⁻; E° = +0.7618 V
<u>Cathode: 2Cr³⁺ (x mol·L⁻¹) + 6e⁻ ⟶ 2Cr; </u> E° = <u>-0.744 V</u>
Overall: 3Zn + 2Cr³⁺(x mol·L⁻¹) ⟶ 3Zn²⁺(4 mol·L⁻¹) + 2Cr; E° = +0.018 V
Step 2. Calculate Q
3. Calculate [Cr³⁺]
![\begin{array}{rcl}Q & = & \dfrac{\text{[Zn$^{2+}$]$^{3}$}}{\text{[Cr}^{3+}]^{2}}\\\\64.0 & = & \dfrac{4^{3}}{\text{[Cr}^{3+}]^{2}}\\\\\text{[Cr}^{3+}]^{2}& = & \dfrac{64}{64.0}\\\\& = & 1\\\text{[Cr}^{3+}] & = & \textbf{1 mol/L}\\\end{array}\\\text{[Cr$^{3+}$] must be less than $\large \boxed{\textbf{1 mol/L}}$ for the reaction to be spontaneous in the reverse}\\\text{direction.}](https://tex.z-dn.net/?f=%5Cbegin%7Barray%7D%7Brcl%7DQ%20%26%20%3D%20%26%20%5Cdfrac%7B%5Ctext%7B%5BZn%24%5E%7B2%2B%7D%24%5D%24%5E%7B3%7D%24%7D%7D%7B%5Ctext%7B%5BCr%7D%5E%7B3%2B%7D%5D%5E%7B2%7D%7D%5C%5C%5C%5C64.0%20%26%20%3D%20%26%20%5Cdfrac%7B4%5E%7B3%7D%7D%7B%5Ctext%7B%5BCr%7D%5E%7B3%2B%7D%5D%5E%7B2%7D%7D%5C%5C%5C%5C%5Ctext%7B%5BCr%7D%5E%7B3%2B%7D%5D%5E%7B2%7D%26%20%3D%20%26%20%5Cdfrac%7B64%7D%7B64.0%7D%5C%5C%5C%5C%26%20%3D%20%26%201%5C%5C%5Ctext%7B%5BCr%7D%5E%7B3%2B%7D%5D%20%26%20%3D%20%26%20%5Ctextbf%7B1%20mol%2FL%7D%5C%5C%5Cend%7Barray%7D%5C%5C%5Ctext%7B%5BCr%24%5E%7B3%2B%7D%24%5D%20must%20be%20less%20than%20%24%5Clarge%20%5Cboxed%7B%5Ctextbf%7B1%20mol%2FL%7D%7D%24%20for%20the%20reaction%20to%20be%20spontaneous%20in%20the%20reverse%7D%5C%5C%5Ctext%7Bdirection.%7D)
