It's between br and si so id go with br
Answer:
All are correct
Explanation:
This might be a little deceptive. The question shows H, O and N which would designate ELEMENTS.
However, all of these can also be considered compounds and molecules as well. BUT, they are H₂, O₂ and N₂ when they are molecules and compounds.
So it depends on the whether the question is being literal or not.
Answer:
Silver tarnishes and becomes black when exposed to oxygen:
Diesel fuel burns when it is heated:
Explanation:
Chemical Changes are those changes in which the chemistry at molecular level is changed as the starting material is converted in to a new and different final material. This change takes place with the breaking of old bonds and forming of new bonds respectively.
Silver tarnishes and becomes black when exposed to oxygen:
This is a chemical change as Silver a white and lustrous starting material is being converted into a tarnish black final material. However, Silver doesn't readily react with oxygen at normal conditions. It readily react with Sulfur containing compounds in air and produces black compound as Ag₂S.
Diesel fuel burns when it is heated:
Diesel is a mixture of hydrocarbons ranging approximately from C₁₀H₂₀ to C₁₅H₂₈. When these hydrocarbons are burnt they produces a new materials i.e. CO₂ and H₂O.
C₁₀H₂₀ + 15 O₂ → 10 CO₂ + 10 H₂O
Hence, it is also a chemical reaction.
Answer:
5.521 × 10⁻² mol/m².s
Explanation:
Given:
Pressure of the Methane and Helium gas = 101.32 kPa
Temperature of the Methane and Helium gas = 298 K
Partial pressure of Methane, pA₁ = 60.79 kPa
Partial pressure of Methane at point 0.02 m away, pA₂ = 20.26 kPa
Now,
Molar flux is given as:
Here,
= 0.675 × 10⁻⁴ m²/s (for He-CH4 at 101.32 kPa and 298 K)
Z₂ - Z₁ = 0.02 m
R is the ideal gas constant = 8.314 J/mol.K
T is the temperature = 298 K
On substituting the respective values, we get
or
= 5.521 × 10⁻² mol/m².s
The equation is the representation of the chemical reaction. The reaction to be added to equation 1 to produce equation 2 is 
.
<h3>What is the chemical reaction?</h3>
The chemical reaction is the change in the reactant for the formation of the product.
The given equation 1 has been:
The final reaction 2 has been:
The reaction with carbon to utilize the reactant oxygen of reaction 1 forming carbon dioxide, results in reaction 2.
Thus, the reaction that must be added will be:
Thus, option A is correct.
Learn more about the chemical equation, here:
brainly.com/question/20492533
