Answer:
B. Stays the same
Explanation:
When the speed is constant, it means that the speed will stay in its position without moving to another speed. In other words, it would stay the same.
Answer:
0.2 dm³
Explanation:
Concentration = no. of moles of solute / volume
Concentration: 0.30 mol dm-³
no. of moles of solute: 0.060mol
0.3 = 0.06 / v
v = 0.2 dm³
He proved that electrons were composed of positive and negatively charged particles.<span />
Answer :
A car stopped at the top of a hill
Explanation :
Definition of potential energy : energy stored that depends upon the relative position of various parts of a system
Answer:
Cr₂O₇⁻²(aq) and ClO₃⁻(aq)
Explanation:
At a redox reaction, one substance must be reduced (gain electrons) and others must be oxidized (lose electrons). To evaluate the potential of the substance to be reduced, it's placed a reaction, in standards conditions, with H₂.
The potential reduction is quantified by E°, and as higher is the value of E°, as easy is to the compound to be reduced. So, at a redox reaction, the compound with the greatest E° will be reduced, and the other will be oxidized, in a spontaneous reaction. The values of E° are:
RuO₄⁻(aq) to RuO₄²⁻(aq) E° = + 0.59 V (the reduction reaction is the opposite of the oxidation reaction).
Ni⁺²(aq) E° = -0.257 V
I₂(s) E° = +0.535 V
Cr₂O₇⁻²(aq) E° = +1.33 V
ClO₃⁻(aq) E° = +0.890 V
Pb²⁺(aq) E° = -0.125 V
So, the substances that have E° higher than the E° of the RuO₄⁻²(aq) are Cr₂O₇⁻²(aq) and ClO₃⁻(aq), which are the substances that can oxidize RuO₄⁻(aq) to RuO₄²⁻(aq).