Most of the time, combustion reactions occur when hydrocarbons react with what element?
Answers
Answer:
Explanation:
Combustion means the process by which the burning of any substance, whether gaseous, liquid or solid, occurs. In this process, the fuel oxidizes and gives off heat, and, frequently, light.
Combustion reactions are reactions where oxygen intervenes as a reagent. Oxygen has the ability to combine with various elements to produce oxides, where then oxidation is the combination of oxygen with another substance. There are oxidations that are extremely slow, but when oxidation is rapid it is called combustion.
When a substance containing carbon and hydrogen (a hydrocarbon) undergoes complete combustion, or burning, oxygen is consumed and carbon dioxide is produced, and water. Incomplete combustion can also occur when part of the fuel does not react completely because oxygen is not enough.
Related Questions
Increasing the intensity and duration of an exercise program too quickly can lead to injury.a. Trueb. False
Which condensed structural formula represents an unsaturated compound?(1) CH3CHCHCH3 (2) CH3CH2CH3 (3) CH3CH3(4) CH4
How many atoms are in 6.2 moles of aluminum?
The addition of sodium chloride to pure water, causes the conductivity to _________.
Answers
The concentration of gallium in kilograms per cubic meter is equal to the calculated mass of gallium per cubic meter.
To determine the concentration of gallium in kilograms per cubic meter, we need to convert the concentration from atomic percent (at%) to kilograms per cubic meter.
The atomic fraction is the ratio of the number of gallium atoms to the total number of atoms in the silicon-gallium mixture.
We need to know the atomic masses of gallium and silicon. The atomic mass of gallium is 69.72 g/mol, and the atomic mass of silicon is 28.09 g/mol.
The atomic fraction of gallium can be calculated using the formula:
Atomic fraction of gallium = (Concentration of gallium in at%) / (Atomic mass of gallium) / [(Concentration of gallium in at%) / (Atomic mass of gallium) + (Concentration of silicon in at%) / (Atomic mass of silicon)]
Plugging in the given values:
Atomic fraction of gallium = (%) / (69.72 g/mol) / [(
at%) / (69.72 g/mol) + (100 -
) at% / (28.09 g/mol)]
Now, let's convert the atomic fraction to the number of gallium atoms per cubic meter. We can use Avogadro's number, to make this conversion.
Number of gallium atoms per cubic meter = Atomic fraction of gallium × Avogadro's number.
Mass of gallium per cubic meter = Number of gallium atoms per cubic meter × (Atomic mass of gallium / 1000)
Therefore, the concentration of gallium in kilograms per cubic meter is equal to the calculated mass of gallium per cubic meter.
Learn more about Concentration here;
#SPJ12
Final answer:
The concentration of gallium in kilograms per cubic meter can be calculated using the atomic mass of gallium and Avogadro's number.
Explanation:
To calculate the concentration of gallium in kilograms per cubic meter, we can use the atomic mass of gallium and Avogadro's number. The concentration in kilograms per cubic meter can be found using the formula:
Concentration (kg/m³) = Concentration (% by mass) x Density (g/cm³) x Atomic Mass (g/mol) / 1000 x Avogadro's Number
First, convert the concentration from at% (atomic percent) to % by mass. Since gallium has an atomic mass of 69.7 g/mol, we can use this value to find the concentration in kilograms per cubic meter.
Learn more about concentration of gallium here:
#SPJ3
Answers
Answer:
Tin: 54.3%
Zinc: 45.7%
Explanation:
The molar masses of the elements are:
Tin: Sn = 117.710 g/mol
Zinc: Zn = 65.409 g/mol
Fluorine: F = 18.998 g/mol
The fluorine gas in excess, so the reaction consumes all the alloy, and all the tin is converted to SnF₄ and all the zinc is converted to ZnF₂. The molar masses of the fluorides are:
SnF₄ = 117.710 + 4*18.998 = 193.702 g/mol
ZnF₂ = 65.409 + 2*18.998 = 103.405 g/mol
If we call x the number of moles of SnF₄, and y the number of moles of ZnF₂, the total mass can be calculated knowing that the mass is the number of moles multiplied by the molar mass:
193.702x + 103.405y = 2.489
The number of moles of Sn is the same as SnF₄ (1:1), and also the number of moles of Zn is the same as ZnF₂ (1:1), so the mass of the alloy:
117.710x + 65.409y = 1.540
if we multiply it by -1.581 and sum with the other equation:
117.710x*(-1.581) + 65.409y*(-1.581) + 193.702x + 103.405y = 1.540*(-1.581) + 2.489
7.60249x = 0.05426
x = 0.0071 mol of Sn
117.710*0.0071 + 65.409y = 1.540
65.409y = 0.704259
y = 0.0108 mol of Zn
The masses are the molar mass multiplied by the number of moles:
Sn: 117.710*0.0071 = 0.836 g
Zn: 65.409*0.0108 = 0.704 g
The percent composition is the mass of the substance divided by the total mass multiplied by 100%:
Sn: (0.836/1.540)*100% = 54.3%
Zn: (0.704/1.540)*100% = 45.7%
The reactant surface area increases.
The reaction rate decreases.
The reaction is not affected at all.
The reaction stops completely.
Answers
Answer:
The increase in pressure alters the equilibrium of the reaction. In this case, the number of gaseous products in the reactant side is zero while the product side contains 1 gaseous product. The increase in pressure favors the side with less number of gaseous molecules which is the reactant side. Hence, the reaction rate decreases.
Explanation:
Answers
Answer : In an aqueous solution, a chloride ion is attracted to the hydrogen end of the water molecule.
Explanation :
The meaning of aqueous solution is the solution in which the solvent is water. In water molecule , oxygen atom is more electronegative than the hydrogen atom. That means, the hydrogen in the water molecule has partial positive charge and oxygen has partial negative charge.
As the chloride ion have the (-1) negative charge. So, it will be attracted towards the positive charge that is hydrogen end of the water molecule because opposite charges attract to each other.
Hence, in an aqueous solution, a chloride ion is attracted to the hydrogen end of the water molecule.
Which statement is true about this reaction?
(1) It is exothermic and DH equals -91.8 kJ.
(2) It is exothermic and DH equals +91.8 kJ.
(3) It is endothermic and DH equals -91.8 kJ.
(4) It is endothermic and DH equals +91.8 kJ.
Answers
Endothermic processes: are those in which occurs the absorption of heat.
the change of enthalpy (ΔH) is greater than zero.
hope this helps!
Some molecules may contain no atoms.
B.
Some elements found in nature exist as molecules.
C.
Some compounds include only one type of element.
D.
Some atoms are made of two or more different elements. Which of these statements is true?
A.
Some molecules may contain no atoms.
B.
Some elements found in nature exist as molecules.
C.
Some compounds include only one type of element.
D.
Some atoms are made of two or more different elements.