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3 years ago

PLEASE HURRY!! ONLY ANSWER IF YOU KNOW FOR SURE

Chemistry

1 answer:

LenaWriter [7]3 years ago

3 0

The cation is written before the anion in the name and formula of an ionic compound.

Answer: Option B

Explanation:

An ionic compounds are a chemical compound at which ions usually held together by an ionic bonds. Typically, a positively charged residue consists of metal cations, while a negatively charged residue consists of an anion or a poly-atomic ion. The ionic compound is mentioned first by a cation after with an anion. The cations have the same name as its element.

For example, $K^{+1}$ is called the potassium ion but simply 'K' refers potassium atom. Anion is called by the name of the element, removing the end part and adding "ide". For example, $F^{-1}$ is called fluorine, an element called fluorine. 'ine' was replaced with an 'ide'. To name the compound, the cation and anion names are added together. For example, NaF (sodium fluoride).

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At 25°C and constant pressure, carbon monoxide gas combines with oxygen gas to give carbon dioxide gas with the evolution of 10.

stealth61 [152]

Answer : The value of $\Delta H$ for the reaction is, -565.6 kJ

Explanation :

First we have to calculate the molar mass of CO.

Molar mass CO = Atomic mass of C + Atomic mass of O = 12 + 16 = 28 g/mole

Now we have to calculate the moles of CO.

$\text{Moles of }CO=\frac{\text{Mass of }CO}{\text{Molar mass of }CO}=\frac{1g}{28g/mole}=\frac{1}{28}mole$

Now we have to calculate the value of $\Delta H$ for the reaction.

The balanced equation will be,

$2CO(g)+O_2(g)\rightarrow 2CO_2(g)$

From the balanced chemical reaction we conclude that,

As, $\frac{1}{28}mole$ of CO release heat = 10.1 kJ

So, 2 mole of CO release heat = $2\times 28\times 10.1=565.6kJ$

Therefore, the value of $\Delta H$ for the reaction is, -565.6 kJ (The negative sign indicates the amount of energy is released)

4 0

3 years ago

Based on the equations below, which metal is the least active? Pb(NO3)2(aq) + Ni (s) --> Ni(NO3)2 (aq)+ Pb(s) Pb(NO3)2(aq) +

viva [34]

Answer:

Explanation:

An active metal is a highly reactive metal. Active metals are found high up in the activity series.

Active metals react with other metals that are lower than them in the activity thereby displacing the lower metals from a solution of their salts. This is what may have happened in the other two reactions.

Ni is the most active metal listed in the question since it can react a compounds with Pb(NO3)2(aq) to liberate Pb metal.

6 0

3 years ago

Why do scientists use spiral tubes instead of straight ones?

elixir [45]

Answer:

Heat and mass transfer of a LiBr/water absorption heat pump system (AHP) was experimentally studied during working a heating-up mode. The examination was performed for a single spiral tube, which was simulated for heat transfer tubes in an absorber. The inside and outside of the tube were subjected to a film flow of the absorption liquid and exposed to the atmosphere, respectively. The maximum temperature of the absorption liquid was observed not at the entrance but in the region a little downward from the entrance in the tube. The steam absorption rate and/or heat generation rate in the liquid film are not constant along the tube. Hence the average convective heat transfer coefficient between the liquid film flowing down and the inside wall of the tube was determined based on a logarithmic mean temperature difference between the tube surface temperature and the film temperature at the maximum temperature location and the bottom. The film heat and mass transfer coefficients rose with increasing Reynolds number of the liquid film stream.

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3 years ago

What is the PTP for 11/4? serving size portion size big mac size

vagabundo [1.1K]

The answer is Big Mac size

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3 years ago

Methylpentane is held in a closed container at 150°f. both gas and liquid are present. what is the pressure in the container

WITCHER [35]

Pressure =vapor pressure of 2 methlypentane at 150F. If you

7 0

3 years ago