couple last minute chem questions~

Test Preparation SAT Subject Test Preparation
1

<p>i dont understand reactivity series and redox:</p>

<p>the following elements are listed in decreasing reactivity order:</p>

<p>Ca, Na, Mg, Zn, Fe, H, Cu, Hg, Ag, Au</p>

<p>the one that is the best reducing agent is:
Ca, Au, H, Fe or Cu</p>

<p>(please also explain)</p>

<p>the element that does NOT react with HCL to produce H2
Zn, Fe, Hg, Ca, Mg</p>

<p>(please explain)</p>

<p>given the following options</p>

<p>a) s-s bonds
b) s-p bonds
c) p-p bonds
d) sp3-p bonds
e) sp2-sp2 bonds</p>

<p>1) bonding in H2
2) bonding in HF
3) bonding in F2</p>

<p>please explain, because I got single bonds for all and thus s-s bonds but that isnt right</p>

<p>thanks for any help, its greatly appreciated (test tmrw!!!)</p>

2

<p>bumping b/c i want to know too!</p>

3

<p>what does "bumping" mean? lol</p>

4

<p>The first part just means that Ca is more reactive than each of the following elements. Reducing agent is another word for an element that that is most easily oxidized. The question about not producing H2 is because those reducing agents tend to form ions with the H+ ions so for example zn reacts with hcl to form znh2. Last part is a, b, c, respectively</p>

5

<p>can u explain the last part (a, b, c)
arent all three just single bonds?</p>

6

<p>nevermind about the hcl question i dont think the explanation is right. H and H are in s orbitals. H and F are in S and P orbitals, and f and f are in p and p orbitals</p>

7

<p>addendum, when the orbitals overlap, it is done on the valence electrons and orbitals that need to filled up are in those orbitals</p>

8

<p>The answer for the second question would be Hg. Mercury only reacts with very few acids, most notably HNO3. </p>

<p>All of the rest can react and produce H2:</p>

<p>Zn + 2HCl ---> ZnCl2 + H2
Fe + 2HCl ---->FeCl2 + H2
Ca + 2HCl ---> CaCl2 + H2
Mg + 2HCl ---> MgCl2 + H2</p>