Which expression could represent theconcentration of a solution?
(1) 3.5 g
(2) 3.5 M
(3) 3.5 mL
(4) 3.5 mol
Answers
As you can see, only M appears in your answers, which means that the correct option should be (2) 3.5 M.
The expression for representation of concentration of a solution has been 3.5 M. Thus, option 2 is correct.
Concentration has been defined as the amount of substance present in a volume of solution. The concentration has been given by varying units. The concentration has been given by mass per unit volume.
It can be represented by moles/L or g/L. The expression that has been similar to moles/L has been molarity.
Thus, the expression for representation of concentration of a solution has been 3.5 M. Thus, option 2 is correct.
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Answers
Answers
a) in this we are diluting a stock solution, so we can use the dilution formula
c1v1 = c2v2
where c1 is concentration and v1 is volume of the stock solution
c2 is concentration and v2 is volume of the diluted solution to be prepared
substituting the values
6.0 M x V = 0.500 M x 110 mL
V = 9.17 mL
9.17 mL of the stock solution should be taken and diluted upto 110 mL to prepare the 0.500 M solution
b)
In this question we are given the volume taken from the stock solution , we have to find the concentration of the diluted solution
again we use the dilution formula, c1v1 = c2v2
substituting the values
6.0 M x 10.0 mL = C x 250 mL
C = 0.24 M
the concentration of diluted solution is 0.24 M
Final answer:
To prepare 110 ml of 0.500 M HNO3 from a 6.0 M HNO3 solution, 9.17 ml of the stock solution would have to be used. If 10.0 ml of the stock solution is diluted to a final volume of 0.250 L, the concentration of the diluted solution will be 0.24 M.
Explanation:
(a) In order to prepare 110 ml of 0.500 M HNO3 from a 6.0 M HNO3 solution, we have to use the formula M1V1 = M2V2 where M and V are the molarity and volume respectively. Here, the M1 and V1 are the molarity and volume of the stock solution and M2 and V2 are the molarity and volume of the diluted solution. Filling in known values, 6.0M * V1 = 0.500M * 110ml. Solving for V1, we get V1 = (0.500 M * 110 ml) / 6.0 M = 9.17 ml. So, you would have to use 9.17 ml of the stock solution.
(b) The diluted solution's molarity is calculated using the same formula as before. Substituting the known values 6.0M * 10.0 ml = M2 * 0.250 L, rearrange the formula to get M2= (6.0M * 10.0 ml) / 0.250 L = 0.24 M or 240 mM. Therefore, the concentration of the diluted solution is 0.24 M.
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Answers
Answer:
A) 2Na + = 2NaBr
Explanation:
As the problem says that you should find the balanced chemical equation for the synthesis of NaBr from Na and , the reactants are Na and
and the product is NaBr, so it can be writen as:
Na + = NaBr
Then you shoud balance the equation, it means that you should have the same number of each element in each part of the equation, so if you put a number 2 for the NaBr and the Na, the equation will be balanced:
2Na + = 2NaBr
Answers
As reactants form products, the potential energy increases.
Thermal energy is transferred from the product to the reacting substances.
Thermal energy is transferred from the surroundings to the reacting substances.
Answers
Answer is: As reactants form products, the potential energy decreases.
There are two types of reaction:
1) Endothermic reaction (chemical reaction that absorbs more energy than it releases).
2) Exothermic reaction (chemical reaction that releases more energy than it absorbs).
For example, balanced chemical reaction:
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O ΔrH= -1370 kJ/mol.
This reaction is exothermic reaction (heat is released), so products have less potential energy and energy is transerred to surroundings.
Considering the definition of exothermic reaction, as reactants form products, the potential energy decreases (first option).
Exothermic reaction
Energy is the ability to do work or to produce heat.
Chemical reactions involve a rearrangement of atoms between substances with the breaking or formation of chemical bonds. In general, this formation or breaking of chemical bonds is accompanied by changes in the energy of the system.
In exothermic reactions, energy is released when they occur (usually this energy is released in form of heat), so the reaction system temperature increases.
In a chemical reaction, the reactants are the compounds that are transformed and give rise to the products. Reactants and products have stored potential energy. In an exothermic reaction, the reactants have more potential energy compared to the products, so the excess energy is released as heat, thus complying with the law of conservation of energy, which says that energy is not lost. gain or loss, so the energy of the reactants must be equal to that of the products.
Summary
In summary, considering the definition of exothermic reaction, as reactants form products, the potential energy decreases (first option).
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