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kvasek [131]
4 years ago
8

Four students are developing a model to illustrate covalent and ionic substances dissolving in

Chemistry
1 answer:
Liono4ka [1.6K]4 years ago
5 0

The students with ionic bonds have a better understanding of what the model needs to illustrate.

Explanation:

  • When ionic compounds dissolve in water, they break apart into the ions that make them up through a process called dissociation.
  • When placed in water, the ions are attracted to the water molecules, each of which carries a polar charge.
  • If the force between the ions and the water molecules is strong enough to break the bonds between the ions, the compound dissolves.
  • The ions dissociate and disperse in solution, each ringed by water molecules to prevent reattachment.
  • The ionic solution turns into an electrolyte, meaning it can conduct electricity.
  • While covalent compounds dissolve in water they break apart into molecules, but not individual atoms.
  • Water is a polar solvent, but covalent compounds are usually nonpolar.
  • This means covalent compounds typically don't dissolve in water, instead making a separate layer on the water's surface.
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During a lab, you heat 1.62 g of a CoCl2 hydrate over a Bunsen burner. After heating, the final mass of the dehydrated compound
sashaice [31]
Answer is: formula of hydrate is CoCl₂· 6H₂O -c<span>obalt(II) chloride hexahydrate
</span>m(CoCl₂· xH₂O) = 1,62 g.
m(CoCl₂) = 0,88 g.
n(CoCl₂) = m(CoCl₂) ÷ M(CoCl₂)
n(CoCl₂) = 0,88 g ÷ 130 g/mol
n(CoCl₂) = 0,0068 mol.
m(H₂O) = 1,62 g - 0,88 g.
m(H₂O) = 0,74 g.
n(H₂O) = m(H₂O) ÷ m(H₂O) 
n(H₂O) = 0,74 g ÷ 18 g/mol
n(H₂O) = 0,041 mol.
n(CoCl₂) : n(H₂O) = 0,0068 mol : 0,041 mol.
n(CoCl₂) : n(H₂O) = 1 : 6.
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What do scientists use molecular clocks to estimate?
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Which of the following is a nonrenewable resource?
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4 years ago
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The water-gas shift reaction CO(g)+H2O(g)⇌CO2(g)+H2(g) is used industrially to produce hydrogen. The reaction enthalpy is ΔH∘=−4
denis23 [38]

Answer:

To increase the yield of H₂ we would use a low temperature.

For an exothermic reaction such as this, decreasing temperature increases the value of K and the amount of products at equilibrium. Low temperature increases the value of K and the amount of products at equilibrium.

Explanation:

Let´s consider the following reaction:

CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g)

When a system at equilibrium is disturbed, the response of the system is explained by Le Chatelier's Principle: <em>If a system at equilibrium suffers a perturbation (in temperature, pressure, concentration), the system will shift its equilibrium position to counteract such perturbation</em>.

In this case, we have an exothermic reaction (ΔH° < 0). We can imagine heat as one of the products. If we decrease the temperature, the system will try to raise it favoring the forward reaction to release heat and, at the same time, increasing the yield of H₂. By having more products, the value of the equilibrium constant K increases.

3 0
3 years ago
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