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dolphi86 [110]
3 years ago
6

I need help on homework

Chemistry
1 answer:
My name is Ann [436]3 years ago
3 0
What do you need help with
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Which type of bond is found between atoms of solid cobalt?
Vsevolod [243]
The answer is (3) metallic. Cobalt is a transition metal, so it can't be covalent bonds, which bond non-metals, therefore eliminating choice 1 and 2. Ionic bonds are between metals and non metals, but solid cobalt does not have a non metal, eliminating choice 4 as well. Metallic bonds are bonds between metals, therefore the answer is (3) metallic.
3 0
3 years ago
Read 2 more answers
You are working in your laboratory and decide to do some cleaning. You find a test tube with some brown substance congealed at t
Anna [14]

Answer:

  • <em>The mystery substance is</em> <u>C. Bromine (Br) </u>

Explanation:

<em>Argon (Ar) </em>is a noble gas. Whose freezing point is -189 °C (very low), thus it cannot be the frozen substance. Also, it is not reactive, thus is would have not reacted with iron. Hence, argon is not the mystery substance.

<em>Scandium (Sc) </em>is a metal from group 3 of the periodic table, thus is will not react with iron. Thus, scandium is not the mystery substance.

Both <em>bromine</em> and <em>iodine</em> are halogens (group 17 of the periodic table).

The freezing point of bromine is −7.2 °C, ​and the freezing point of iodine is 113.7 °C. Thus, both could be solids (frozen) in the lab.

The reactivity of the halogens decrease from top to bottom inside the group. Bromine is above iodine. Then bromine is more reactive than iodine.

Bromine is reactive enough to react with iron. Iodine is not reactive enough to react with iron.

You can find in the internet that bromine vapour over hot iron reacts  producing iron(III) bromide. Also, that bromine vapors are red-brown.

Therefore, <em>the mystery substance is bromine (Br).</em>

7 0
3 years ago
2 hydrogen atoms; 3 helium atoms; 5 oxygen atoms; 6 iron atoms
lidiya [134]

Answer:

4chlorine;12thousand ;17zinc;2grams;three 8carbon;15aluminium

7 0
3 years ago
❤Bree here! I need some help! ❤
lora16 [44]

I think its B. Chemical Change

5 0
3 years ago
Read 2 more answers
Write the dissociation equation for NH4OH.​
iVinArrow [24]

Explanation:

NH4OH(aq) ---> NH4+(aq) + OH-(aq)

7 0
3 years ago
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