What are four physical properties of aluminum foil?

Answer:

The correct option is D

Explanation:

The combined gas law is a combination of the three gas laws; Boyle's law, Charles' law and Gay-Lussac's law. It describes the relationship of the product of the pressure, volume and temperature of a gas to a constant as shown in the formula below

P₁V₁/T₁ = P₂V₂/T₂

Where P₁ is the initial pressure

V₁ is the initial volume

T₁ is the initial temperature (in Kelvin)

P₂ is the final pressure

V₂ is the final volume

T₂ is the final temperature (in Kelvin)

Answer:

the answer is sodium nitrate because it is solute

Explanation

thats what is correct I assure you.

Answer:

Two  

Step-by-step explanation:

There are two ways to determine the number sets of equivalent protons in a compound.  

(a) By substitution

Replace each H with a different group and see if you get a different compound

For example, the six CH₃ H atoms are an equivalent set, because, if I replace any one of them, I will always get the same compound: 1-chloromethyl-4-methylbenzene (Fig. 1).

Similarly, the four aromatic H atoms are an equivalent set. If I replace any one of them, I will always get the same compound: 2-chloro-1,4-dimethylbenzene (Fig. 2).

Thus, there are two sets of equivalent protons in p-xylene.

(b) By symmetry

Two atoms are equivalent if one can be converted into the other by a symmetry operation on the molecule.

The methyl hydrogens can be interconverted by a combination of reflections about the AB and CD mirror planes and byrotations about the C-C bonds to the ring (Fig. 3).

Similarly, the four aromatic H atoms can be interconverted by a combination of reflections about the AB and CD mirror planes.

Again, we find two sets of equivalent protons.

Answer:

4)  N2(g) + O2(g) → 2NO(g)

Explanation:

In a chemical equation, the location of the word "heat" can be used to quickly determine whether the reaction is endothermic or exothermic. If heat is released as a product of the reaction, the reaction is exothermic. If heat is listed on the side of the reactants, the reaction is endothermic.

However in the options given, heat was not mentioned. this means we would have to undergo elimination process.

Option 2 represents combustion of methane, heat is a natural by product of any combustion reaction. hence, the correct answer cannot be 2.

Option 1 - The C=O bonds in CO2 have a high bond energy (the energy you would need to break them) which is more than either of the C-C or O=O bonds in the elements and their sum. Thus to create C and O2 from CO2 you would have to put in energy to break the two C=O bonds. You would get some back from the C-C and O=O bonds but less. Thus you need to add a lot of energy to convert CO2 into its elements. (You can decompose it at high temperatures.)

The reverse process gives off heat. So again, the correct answer cannot be 1.

Option 3 - The heat of formation of H2 ( g ) and N2( gas) under the standard condition is zero ( 0), and heat of formation of NH3 ( g ) is -46.11 kj / mol, so for the formation of 2 moles of NH3( g ) it would be - 92.22 kj,

The -ve symbol is indicative of the above reaction is exothermic in nature. So again, the correct answer cannot be 3.

Our only option left is 4 - The standard enthalpy of formation of nitric oxide (NO) in the gas phase is about +90 kJ/mol, which is endothermic. The primary reason for this is that the nitrogen-nitrogen triple bond is very strong (941 kJ/mol). The energy cost to break that bond as well as the oxygen-oxygen double bond (495 kJ/mol) is not compensated by the forming of the nitrogen-oxygen double bond (607 kJ/mol). Endothermic reactions are the result of breaking strong bonds and forming weaker ones.

Answer : The correct option is, 200.00 mole

Explanation : Given,

Moles of nitrogen dioxide = 300.00 mole

The balanced chemical reaction will be,

From the balanced chemical reaction, we conclude that 3 moles of nitrogen dioxide react with 1 mole of water to give 2 moles of nitric acid and 1 mole of nitric oxide as a product.

As, 3 moles of nitrogen dioxide react to give 2 moles of nitric acid

So, 300.00 moles of nitrogen dioxide react to give moles of nitric acid

Therefore, the number of moles of nitric acid is, 200.00 moles