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4 years ago

Which element is a liquid at 1000 k 1.Ag 2.Al 3.Ca 4.Ni

2 answers:

7 0

in these options not any Element are liquid at 1000k i think you type wrong in first option It is Hg not Ag and Hg is liquid at 1000 k

-Dominant- [34]4 years ago

6 0

<u>Answer:</u> The correct answer is Option 2.

<u>Explanation:</u>

All the given elements are considered as metals because they all are solid at room temperature and solids are generally solid at room temperatures.

For a solid to change into liquid, it has to attain a minimum temperature known as melting point of that solid.

The melting point of the given elements are:

Silver (Ag) = 1235 K

Aluminium (Al) = 933.5 K

Calcium (Ca) = 1115 K

Nickel )Ni) = 1728 K

From the above melting points, the element which will turn into liquid below 1000 K will be aluminium.

Hence, the correct answer is Option 2.

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Answer:

Cu(NO3)2 --> MM187.5558

NiNO3 *COEF2* --> 120.6983

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4 years ago

Which is a resource that the National Park Service manages?

pantera1 [17]

Answer:

to preserve the integrity of the wildlife refuge, ecosystems and the endangered species.

Explanation:

A national park service manages

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3 years ago

Which statements about the reaction are true? Select all that apply. The reaction is exothermic The reaction is endothermic The

Digiron [165]

The statements true for the reaction are A, C, and E.

The potential energy diagram of the following reaction has been given:

$\rm CH_4\;+\;2\;O_2\;\rightarrow\;2\;H_2O\;+\;CO_2\;+\;891\;kJ$

The reaction has been given to form water and carbon dioxide, along with the release of 891 kJ of energy.

<h3>Statements for the reaction</h3>

The endothermic reaction is the type of reaction that absorbed the energy from the system, while exothermic reaction released energy in the system.

The given system has releasing 891 kJ of energy. Thus, it has been an exothermic reaction.

The equation has been representing the 891 kJ of energy as the product. Thus, it has been released in the reaction as product.

The potential energy graph has been representing that the energy of the reactant has been higher than the product.

Thus, the statements true for the reaction are A, C, and E.

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3 years ago

A student adds 0.40g of sodium hydroxide to a clean, dry 250 mL beaker and leaves the beaker and leaves the beaker on the lab ta

kherson [118]

2 NaOH (s) + CO₂ (g) → Na₂CO₃ (s) + H₂O (l)

Explanation:

The most probably chemical reaction is:

2 NaOH (s) + CO₂ (g) → Na₂CO₃ (s) + H₂O (l)

Sodium Hydroxide (solid) + Carbon Dioxide (gas) → Sodium Carbonate (solid) + Water (gas)

In this reaction the water you obtain have to be in liquid form because the reaction takes place at room temperature. However because the student left the beaker for 24 hours, the water have a plenty of time to evaporate, so in the end only sodium carbonate (Na₂CO₃) remained in the beaker.

number of moles = mass / molar weight

number of moles of NaOH = 0.4 / 40 = 0.01 moles

Taking in account the chemical reaction, we devise the following reasoning:

if 2 moles of NaOH produce 1 mole of Na₂CO₃

then 0.01 moles of NaOH produce X mole of Na₂CO₃

X = (0.01 × 1) / 2 = 0.005 moles of Na₂CO₃

mass = number of moles × molar weight

mass of Na₂CO₃ = 0.005 × 106 = 0.53 g

mass of Na₂CO₃ = mass of beaker and its contents after 24h - mass of empty beaker

mass of Na₂CO₃ = 113.09 - 112.58 = 0.51 g which is close the theoretical value of 0.53 g.

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number of moles

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5 0

3 years ago

The first electron shell of an atom is complete when it has ___ electrons and the second electron shell is complete when it has

elena-s [515]

Answer:

2, 8, 8

Explanation:

The first electron shell always has 2 electrons when it is complete. The second electron shell and 3rd shell can hold 8 when completed.

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3 years ago