You will need wire cutters to remove just a little bit of insulation it should only be a few centimeters(remove from both sides).Then make sure to wrap the wire neatly around the nail.The more wire you put the stronger your magnet is.
-Detor
Answer:
Explanation:
We must look up the standard reduction potentials for the half-reactions.
<u> ℰ° </u>
Cr₂O₇²⁻ + 14H⁺ + 6e⁻ ⇌ 2Cr³⁺ + 7H₂O 1.36
Cl₂ + 2e⁻ ⇌ 2Cl⁻ 1.35827
2IO₃⁻ + 12H⁺ + 10e⁻ ⇌ I₂ + 6H₂O 1.195
Fe³⁺ + e⁻ ⇌ Fe²⁺ 0.771
(a) Cr³⁺/Cl₂
We reverse the sign of ℰ° for the oxidation half-reaction. Then we add the two half-reactions and their ℰ° values.
<u> ℰ°/V </u>
2Cr³⁺ + 7H₂O ⇌ Cr₂O₇²⁻ + 14H⁺ + 6e⁻ -1.36
<u>Cl₂ + 2e⁻ ⇌ 2Cl⁻ </u> <u>1.358 27
</u>
2Cr³⁺ + 3Cl₂ + 7H₂O ⇌ Cr₂O₇²⁻ + 6Cl⁻ + 14H⁺ 0.00
(b) Fe²⁺/IO₃⁻
<u> ℰ°/V
</u>
Fe²⁺ ⇌ Fe³⁺ + e⁻ -0.771
<u>2IO₃⁻ + 12H⁺ + 10e⁻ ⇌ I₂ + 6H₂O </u> <u> 1.195
</u>
10Fe²⁺ + 2IO₃⁻ + 12H⁺ ⇌ 10Fe³⁺ + I₂ + 6H₂O 0.424
The ℰ° values for the cells are
Potassium is placed where it is based on its properties and it's reactivity. It's also placed there based on it's atomic number.
<h2><u>Density</u></h2>
Problem:
a solid is 5 cm tall 3 cm wide and 2 cm stick it has a mass of 129 g what is its density
Answer:
Solution:
To achieve a volume of 30, multiply 5,3, and 2 together. Density is defined as the ratio of mass to volume, thus divide 129 by 30. You'd obtain a mass of 4.3.
- Therefore 4.3 g/cm³ would be the answer.