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2 years ago

(1) Complete the word equation for the complete combustion of methane in

1 answer:

6 0

Cooled in ice to help the water vapour condense. Tube 2 – contains lime water, goes cloudy to show the presence of carbon dioxide. Word equation: (hydrocarbon + oxygen → carbon dioxide + water) Methane + oxygen → carbon dioxide + water.

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Why the copper is able to replace the silver, but the reverse reaction will not result in a replacement reaction?

PSYCHO15rus [73]

Answer:

Copper is more reactive and higher in the activity series

Explanation:

Copper is able to replace the silver in a replacement reaction because it is more reactive and higher in the activity series.

Substances or ions that are higher in the activity series are typically more reactive than those ones below them.

In like manner, they are able to replace the lowers ones in a chemical reaction due to their higher reactivity potential.

A less reactive element and a lower one in the activity series cannot displace a higher one in the series.

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3 years ago

Select the lewis structure for xeo2f2 which correctly minimizes formal charges.

IrinaVladis [17]

Answer:

explanation and image attached

Explanation:

Our aim is to draw a structure of XeO2F2 whith the least formal charges. We must remember that the compound has 34 valence electrons.

To obtain the least formal charges then Xe must have a total of twelve electrons on its valence shell instead of eight.

The other atoms around the central Xe atom are arranged as shown in the image attached.

Image Credit: UCLA

7 0

3 years ago

How many g are in 16822 mg?

laila [671]

Answer:

it is jues

Explanation:

1 know

4 0

3 years ago

Find the molar enthalpy of formation for paraffin wax (C2H526)) given the following reaction

pogonyaev

Answer: The molar enthalpy of formation for paraffin wax is -2460.5 kJ

Explanation:

The balanced chemical reaction is,

$C_{25}H_{52}(g)+38O_2(g)\rightarrow 25CO_2(g)+26H_2O(g)$

The expression for enthalpy change is,

$\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]$

$\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+(n_{H_2O}\times \Delta H_{H_2O})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{C_{25}H_{52}}\times \Delta H_{C_{25}H_{52}})]$

where,

n = number of moles

$\Delta H_{O_2}=0$ (as heat of formation of substances in their standard state is zero

Now put all the given values in this expression, we get

$-14800=[(25\times -393.5)+(26\times -285.5)]-[(38\times 0)+(1\times \Delta H_{C_{25}H_{52}})]$

$\Delta H_{C_{25}H_{52}}=-2460.5kJ/mol$

Therefore, the molar enthalpy of formation for paraffin wax is -2460.5 kJ

3 0

3 years ago

What are the atomic number and mass number for the carbon isotope with seven neutrons?

Nady [450]

Answer:

The answer to your question is:

atomic number (Z): 6

mass number (A) : 13

Explanation:

Carbon has an atomic number of 6 and a mass number of 12,

Mass number = # protons + # neutrons

12 = 6 + # neutrons

#neutrons = 12 - 6 = 6

For the carbon isotope the atomic number does not change is still 6

13 = 6 + # neutrons

# neutrons = 13 - 6

# neutrons = 7

7 0

3 years ago