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Marianna [84]
3 years ago
9

Give the correct number of significant figures in 1.900.0 kg*

Chemistry
1 answer:
elena-14-01-66 [18.8K]3 years ago
6 0
1 significant figure
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Cual Fue la teoria de la<br>Cuatro elementos​
Oliga [24]

Answer:

The ancient Greeks believed that there were four elements that everything was made up of earth, water, air, and fire.

Los antiguos griegos creían que había cuatro elementos y que todo estaba compuesto de tierra, agua, aire y fuego.

Explanation:

5 0
2 years ago
What is the difference between evaporation and boiling
Gekata [30.6K]
Answer:

Evaporation is slower, occurs only from the surface of the liquid, does not produce bubbles, and leads to cooling. Boiling is faster, can occur throughout the liquid, produces lots of bubbles, and does not result in cooling.
8 0
3 years ago
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The student is now told that the four solids, in no particular order, are aluminum chloride (AlCl3), sugar (C6H12O6), benzoic ac
zaharov [31]

Answer:

AlCl₃, NaBr, C₆H₅COOH, C₆H₁₂O₆.

Explanation:

The more ions in solution, the greater the conductivity of a solution because these charged particles can carry electrons in the solution.

In the first place, when AlCl₃ dissolves in water it produces 4 ions:

AlCl₃(aq) ⇄ Al³⁺(aq) + 3 Cl⁻(aq)

If the solution is 0.20M in AlCl₃, it will be 4 x 0.20M = 0.80M in ions.

Secondly, NaBr is a strong electrolyte (<em>complete ionization</em>) so it produces 2 moles of ions per each mole of NaBr dissolved:

NaBr(aq) ⇄ Na⁺(aq) + Br⁻(aq)

If the solution is 0.20M in NaBr, it will be 2 x 0.20M = 0.40M in ions.

Then, benzoic acid is a weak electrolyte (<em>partial ionization</em>) so it will produce <em>less than</em> 2 moles of ions per each mole of benzoic acid dissolved:

C₆H₅COOH(aq) ⇄ C₆H₅COO⁻(aq) + H⁺(aq)

If the solution is 0.20M in benzoic acid, the solution will be far below 0.40M in ions.

Finally, sugar has only nonpolar covalent bonds so it will produce no ions in solution, thus being a poor electricity conductor.

4 0
3 years ago
CHEM HELP PLZZZZ!!!!!
earnstyle [38]

Answer:

1. acid

2. neutral

3. acid

4. base

5. acid

6. base

7. neutral

8. acid

9. base

10. base

Explanation:

I'm not 100 percent positive about number three but the rest I believe are correct

3 0
2 years ago
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Given the balanced equation representing a reaction at 101.3 kPa and 298 K:
ser-zykov [4K]
Answer (4)

Endothermic processes: are those in which occurs the absorption of heat.
the change of enthalpy (ΔH) is greater <span>than zero.
</span>
hope this helps!
8 0
3 years ago
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