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3 years ago

Why aluminium foils are use to wrap food items

Chemistry

2 answers:

Daniel [21]3 years ago

4 0

Because either of the heat or the coolness

nekit [7.7K]3 years ago

3 0

Because they insulate either the heat or the coolness within the food item. But keep in mind- when it comes to electricity aluminum isn’t an insulator.

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How does a temperature rain forest differ from the taiga

nadya68 [22]

It is cold in Taiga and it doesn't rain a lot, It snows a lot

7 0

3 years ago

Read 2 more answers

Calculate ΔHo for the following reaction ussing the given bond dissociation energiesCH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)BOND

Mazyrski [523]

Answer:

The ΔH° for the following reaction is -794 kJ, hence exothermic reaction,

Explanation:

$CH_4(g) + 2O_2(g)\rightarrow CO_2(g) + 2H_2O(g) ,$ ΔH° = ?

We are given with:

$\Delta H_{O-O}=142 kJ/mol$

$\Delta H_{O=O}=498 kJ/mol$

$\Delta H_{H-O}=459 kJ/mol$

$\Delta H_{C-H}=411 kJ/mol$

$\Delta H_{C-O}=358 kJ/mol$

$\Delta H_{C=O}=799 kJ/mol$

ΔH° =

(Energies required to break bonds on reactant side) - (Energies released on formation of bonds on product side)

$\Delta H^o=(1 mol\times 4\times \Delta H_{C-H}+2 mol\times 1\times \Delta H_{O=O})-(1 mol\times 2\times \Delta H_{C=O}+2 mol\times 2\times\Delta H_{H-O})$

$\Delta H^o=(1 mol\times 4\times 411 kJ/mol+2 mol\times 1\times 498 kJ/mol)-(1 mol\times 2\times 799 kJ/mol+2 mol\times 2\times 459 kJ/mol)$

$\Delta H^o=-794kJ$

$\Delta H^o>0$ endothermic reaction

$\Delta H^o$ exothermic reaction

The ΔH° for the following reaction is -794 kJ, hence exothermic reaction,

4 0

4 years ago

Explain why the product at the negative electrode is not always a metal.

Elena-2011 [213]

Answer:

Whether you get the metal or hydrogen during electrolysis depends on the position of the metal in the reactivity series: the metal will be produced if it is less reactive than hydrogen. hydrogen will be produced if the metal is more reactive than hydrogen.

3 0

3 years ago

Increasing the temperature increase the rate of a reaction by doing which of the following

posledela

Answer:

Increase in temperature increases the average kinetic energy of the reactant molecules, hence lowering the activation energy of the reaction.

8 0

3 years ago

Calculate the force of gravity on a 1-Kilogram box located a point 1.3x10^7 meters from the center of Earth if the force on a 2.

k0ka [10]

The force of gravity on the 1 kg box is 2 N.

The formula for the force of gravity F on an object with mass m is

F = (GmM)/d²

Since G, M , and d are the same for both objects, (GM)/d² = a constant = k ). Then, we can write

F = km

F₂/F₁ = m₂/m₁

F₂ = F₁ × m₂/m₁

If the 2.5 kg box is object 1,

F₂= 6.1 N × (1 kg/2.5 kg) = 2 N

Note: The answer can have only one significant figure because that is all you gave for the mass of the 1 kg object.

6 0

3 years ago