Answer:
Explanation:
4HCl + O₂ ⇌ 2Cl₂ + 2H₂O
E/mol·L⁻¹: 0.80 0.20 3.0 3.0
![K_{\text{eq}} = \dfrac{\text{[Cl$_{2}$]$^{2}$[H$_{2}$O]$^{2}$}}{\text{[HCl]$^{4}$[O$_{2}$]}} = \dfrac{3.0^{2}\times3.0^{2}}{0.80^{4}\times 0.20} = \mathbf{990}\\\\\text{The $K_{\text{eq}}$ value is $\large \boxed{\mathbf{990}}$}](https://tex.z-dn.net/?f=K_%7B%5Ctext%7Beq%7D%7D%20%3D%20%5Cdfrac%7B%5Ctext%7B%5BCl%24_%7B2%7D%24%5D%24%5E%7B2%7D%24%5BH%24_%7B2%7D%24O%5D%24%5E%7B2%7D%24%7D%7D%7B%5Ctext%7B%5BHCl%5D%24%5E%7B4%7D%24%5BO%24_%7B2%7D%24%5D%7D%7D%20%3D%20%5Cdfrac%7B3.0%5E%7B2%7D%5Ctimes3.0%5E%7B2%7D%7D%7B0.80%5E%7B4%7D%5Ctimes%200.20%7D%20%3D%20%5Cmathbf%7B990%7D%5C%5C%5C%5C%5Ctext%7BThe%20%24K_%7B%5Ctext%7Beq%7D%7D%24%20value%20is%20%24%5Clarge%20%5Cboxed%7B%5Cmathbf%7B990%7D%7D%24%7D)
Answer: A. Perform a gravity filtration with a stemless funnel.
Explanation: Gravity filtration with a stemless funnel prevent blocking up the funnel. Undissolved sample may come out in the stem when the solution cools down thus will be blocking the funnel. Using stemless funnel prevent this problem.
Answer:
Increase in the concentration of the reactants (vinegar and baking soda) leads to an increase in the rate of reaction (more volume of CO2 is evolved within a shorter time)
Explanation:
The chemical reaction between baking soda and vinegar in water is shown in the chemical reaction equation below;
NaHCO3(aq) + CH3COOH(aq) ----->CO2(g) + H2O(l) + CH3COONa(aq)
The chemical name of baking soda is sodium bicarbonate (NaHCO3) while vineager is a dilute acetic acid (CH3COOH) solution. This reaction provides a very easy set up in which we can study the effect of concentration on the rate of chemical reaction.
We must have it behind our minds that increase in the concentration of reactant species increases the rate of chemical reaction. Secondly, the rate of the reaction between baking soda and vinegar can be monitored by observing the volume of CO2 evolved and how quickly it evolves from the reaction mixture.
We can now postulate a hypothesis which states that; 'increase in the concentration of the reactants (vinegar and baking soda) leads to an increase in the rate of reaction (more volume of CO2 is evolved within a shorter time).'
If we go ahead to subject this hypothesis to experimental test, it will be confirmed to be true because a greater volume of CO2 will be evolved within a shorter time as the concentration of the reactants increases.
Answer:
4 means there are four molecules of Na₂SO₃.
Explanation:
Molecule:
A molecule is the smaller particle which can exist independently.
It may be monoatomic , diatomic, triatomic etc.
For example,
Hydrogen molecule consist of two atoms H₂
Nitrogen molecule = N₂
It may be combination of atoms of different elements.
HCl, H₂SO₄,Na₂SO₃
HCl = 1 mole of hydrochloric acid or one molecules of hydrochloric acid
H₂SO₄= 1 mole of sulfuric acid or one molecule of sulfuric acid
Na₂SO₃ = 1 mole of sodium sulfite or one molecule of sodium sulfite.
4Na₂SO₃ = 4 mole of sodium sulfite or four molecule of sodium sulfite.
The coefficient before the formula indicate the total number of molecules.
So if you are trying to find the coffee with the highest concentration of sugar, the cup that has the highest concentration of sugar is the cup that Sarah made on Thursday.
Since there were sugar molecules remaining at the bottom of her coffee cup, that means that the coffee solution was completely saturated with sugar - no more sugar was able to dissolve in the coffee.
