Answer:
scientists often communicate their research results in three general ways:
1) One is to publish their results in peer-reviewed journals that can be ready by other scientists.
2) Two is to present their results at national and international conferences where other scientists can listen to presentations
Explanation:
<span>Important information to solve the exercise :
Substance ΔHf (kJ/mol):
HCl(g)= −92.0 </span><span>kJ/mol
Al(OH)3(s)= −1277.0 </span><span><span>kJ/mol
</span> H2O(l)= −285.8 </span><span>kJ/mol
AlCl3(s) =−705.6 </span><span>kJ/mol
</span><span>Al(OH)3(s)+3HCl(g)→AlCl3(s)+3H2O(l)
reactants products
products- reactants:</span><span>
(−705.6) + (3 x −285.8) - ( −1277.0 ) - (3 x −92.0 ) = - 10.0 </span>kJ per mole at 25°C
<span>
</span>
Answer:
equal to [OH-]
Hydrogen ion concentration is more conveniently expressed as pH, which is the logarithm of the reciprocal of the hydrogen ion concentration in gram moles per liter. Thus, in a neutral solution the hydrogen ion (H+) and the hydroxyl ion (OH−)
Answer : The boiling point of the solution is
Explanation :
Formula used for Elevation in boiling point :
or,
where,
= boiling point of solution = ?
= boiling point of water =
= boiling point constant of water =
m = molality
i = Van't Hoff factor = 1 (for non-electrolyte)
= moles of solute (ethylene glycol) = 0.75 mole
= mass of solvent (water) = 1 kg
Now put all the given values in the above formula, we get:
Therefore, the boiling point of the solution is
Answer:
2Ag(s) + 2HNO₃ (aq) → 2AgNO₃(aq) + H₂(g)
Explanation:
Metallic silver = Ag (s)
Concentrated nitric acid = HNO₃ (aq)
Product being hydrogen gas = H₂(g)
2Ag(s) + 2HNO₃ (aq) → 2AgNO₃(aq) + H₂(g)
Be careful AgNO₃ doesn't precipitate