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Norma-Jean [14]
3 years ago
5

We use the periodic table to determine a mineral’s hardness true or false

Chemistry
2 answers:
Ray Of Light [21]3 years ago
6 0
False we use it to determine what type of element it is as well as the atomic mass and number
Bas_tet [7]3 years ago
3 0
False we use it to detirmine the reactivitys and what groups they are in
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NEED HELP! thank you!
Zanzabum

Answer:

This is a physical change.

Explanation:

As long as the identity of the substance has not changed, and the element is present before and after, it is a physical change! (Ex: ice melting)

7 0
3 years ago
Which of the following motions is least like an earthquake wave?
Zarrin [17]

Surface waves are the slowest moving of the seismic waves created during an earthquake
Good luck
7 0
3 years ago
Write the first and second ionization equations for H2SeO3 please.
IRISSAK [1]
As a diprotic acid, the H₂SeO₃ can ionize by step. First step is H₂SeO₃ =(reversible reaction) H⁺ + HSeO₃⁻. And second step is HSeO₃⁻ =(reversible reaction) H⁺ +SeO₃ ²⁻.
3 0
3 years ago
If 41.38 g of sodium combines with
Arlecino [84]
I think it is 3 because Sus wiw word if rn
3 0
3 years ago
Given that the ka for hocl is 3.5 × 10–8, calculate the k value for the reaction of hocl with oh–.
Harlamova29_29 [7]
Following reaction is involved in above system
HOCl(aq)  ↔  H+(aq) + OCl-<span>(aq)
</span>OCl-(aq) + H2O(l)  ↔ HOCl(aq) + OH-<span>(aq)
</span>
Now, if the system is obeys 1st order kinetics we have
K  = [OCl-][H+<span>]/[HOCl]   ............. (1)
</span>∴ [HOCl-] / [OCl-] = [H+] (1 / 3.0 * 10-8<span>)   ............. (2)
</span>
and now considering that system is obeying 2nd order kinetics, we have
K  = [OH-][HOCl-] / [OCl-] ................. (3<span>)
</span>Subs 2 in 3 we get
K = [OH-][H+] (1 / 3.0 * 10-8<span>)
</span>we know that, [OH-][H+] = 10<span>-14

</span>∴K = 3.3 * 10<span>-7
</span>
Thus, correct answer is e i.e none of these
6 0
3 years ago
Read 2 more answers
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