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katovenus [111]
3 years ago
6

Answer these

Chemistry
1 answer:
Elan Coil [88]3 years ago
3 0
1. Physical properties examples- Color density hardness. Chemical properties example- flammability in corrosion/oxidation resistance
2. Physical properties examples- Color temperature turbidity taste and odor chemical properties examples- Universal solvent Water molecules join together like magnets
3. High heat capacity cohesion adhesion and lower density one frozen
You might be interested in
What you think would happen if global warming caused a decrease in all clouds
marta [7]

Answer:

Global warming is expected to cause changes in the amount of cloud cover, and the height and thickness of these clouds in the future, shifting the balance between the parasol and blanket effects of clouds. The knock-on effect this will have on temperature is known as cloud feedback

Explanation:

Global warming is expected to cause changes in the amount of cloud cover, and the height and thickness of these clouds in the future, shifting the balance between the parasol and blanket effects of clouds. The knock-on effect this will have on temperature is known as cloud feedback

7 0
3 years ago
The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.
astraxan [27]

Answer:

It will take 6.6 hours for 75% of the lead to decay.

Explanation:

The radioactive decay follows first order rate law

The half life and rate constant are related as

k=rate constant=\frac{0.693}{halflife}=\frac{0.693}{3.3}=0.21h^{-1}

The rate law for first order reaction is

time=\frac{1}{k}(ln[\frac{A_{0}}{A_{t}}]

Where

A0 = initial concentration = 1 g

At= final concentration = 0.25 g (as 75% undergoes decay so 25% left]

time=\frac{1}{0.21}(ln(\frac{1}{0.25})=6.6hours

5 0
3 years ago
The value of ΔH for the reaction below is -72 kJ. __________ kJ of heat are released when 1.0 mol of HBr is formed in this react
eimsori [14]

Answer:

36 KJ of heat are released when 1.0 mole of HBr is formed.

Explanation:

<em>By Hess law,</em>

<em>The heat of any reaction  ΔH  for a specific reaction is equal to the sum of the heats of reaction for any set of reactions which in sum are equivalent to the overall reaction:</em>

H 2 (g) + Br 2 (g) → 2HBr (g)         ΔH = -72 KJ

This is the energy released when 2 moles of HBr is formed from one mole each of H2 and Br2.

Therefore, Heat released for the formation of 1 mol HBr would be half of this.

Hence,

ΔHreq = -36 kJ

36 KJ of heat are released when 1.0 mole of HBr is formed.

4 0
3 years ago
What class of organic product results when 1-heptyne is treated with a mixture of mercuric acetate (HgSO4) in aqueous sulfuric a
Alekssandra [29.7K]

Answer:

<u>heptan-2-one</u>

Explanation:

In this case, the final product would be a ketone: <u>heptan-2-one</u>. To understand why this molecule is produced we have to check the<u> reaction mechanism</u>.

The first step is the <u>protonation</u> of the triple bond to produce the more stable carbocation (a secondary one) by the action of sulfuric acid H_2SO_4. The next step is the <u>attack of water</u> to the carbocation to produce a new bond between C and the O, producing a positive charge in the oxygen. Then, a <u>deprotonation</u> step takes place to produce an <u>enol</u>. Finally, we will have a rearrangement (<u>keto-enol tautomerism</u>) to produce the final ketone.

See figure 1

I hope it helps!

7 0
3 years ago
Please help, thank you! :D
Nezavi [6.7K]
25.13(5512)
4568%of the time is 56789
5678
4333
5 0
3 years ago
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