What is the OH- concentration of a solution whose pH is 12.40?
Answers
12.40 + pOH = 14
pOH = 14 - 12.40
pOH = 1.6
[OH⁻] =
[OH⁻] =
[OH⁻] = 2.5x10⁻² M
hope this helps!
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mixture or pure substance: 1.blood 2.dyes 3.self-raising flour 4.muesli 5.copper wire 6.distilled water 7.table salt 8.milk 9.bronze 10.tea 11.oxygen 12.air
physical
chemical
nuclear
Answers
A physical change occurs when a substance changes phase.
For example, boiling pure water (H₂O) is physical change of substance (from liquid to gaseous state). In physical change, the bonds between oxygen and hydrogen can not be separated.
Sublimation of iodine (from solid to gas state) is also physical change.
Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change.
Final answer:
A physical change occurs when a substance changes phase. In this process, a substance may change from one state of matter to another but its foundational substance remains the same.
Explanation:
A physical change takes place when a substance alters its phase. This means that it shifts from one state of matter (solid, liquid, gas) to another. It's crucial to remember that although the physical characteristics of the substance may change, its substance does not. Let's take an example of water, it can exist as solid (ice), liquid (water), and gas (steam) but in all these states it remains H2O. Therefore, when a substance changes phase, it undergoes a physical change, not a chemical or a nuclear change.
Learn more about Phase Change here:
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b. distribution.
c. conservation.
d. irrigation.
Answers
Answer: Option (c) is the correct answer.
Explanation:
When we avoid wastage of water or overuse of then then it is known as conservation of water.
For example, turning off tap when bucket placed below it is filled with water means avoiding wastage of water.
Whereas over flow of water from the bucket is wastage of water.
Thus, we can conclude that using less water is one way to practice water conservation.
c. can be broken down into atoms.
b. smells.
d. reacts with other substances.
Answers
B. Copper
C. Propanol
D. Water
(P.s, tysm )
Answers
The substance that cannot be decomposed by a chemical change is: B. Copper
What is copper
Copper is an element, and elements cannot be broken down into simpler substances through chemical changes. Chemical changes involve the rearrangement of atoms in molecules, leading to the formation of new substances.
However, in the case of an element like copper, it is composed of only one type of atom (Cu), and it cannot be further broken down into simpler substances by a chemical reaction.
Read mroe on copper here brainly.com/question/26449005
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Answers
Ca(OH)2 + 2HCl —> CaCl2 + 2H2O
Stoichiometry of Ca(OH)2 to HCl is 1:2
Number of Ca(OH)2 moles present - 0.001 mol/L / 1000 mL/L x 25 mL
Number of Ca(OH)2 moles = 2.5 x 10^(-5) mol
Number of HCl moles needed for neutralisation = 2.5 x 10^(-5) mol x2 = 5 x 10 ^(-5) mol
The molarity of HCl solution is 0.005 M
The solution contains 0.005 mol in 1000 mL
Therefore volume of 5x10^(-5) mol in = 1000/0.005 x 5 x 10^(-5) mol = 10 mL
10 mL of HCl is needed for neutralisation
b. False?
Answers
Answer:
The correct answer is option b.
Explanation:
Exothermic reactions are defined as the reactions in which energy of reactants is more than the energy of the products. In these reactions, energy is released by the system. The total enthalpy of the reaction comes out to be negative.
In these reaction , products are favored when temperature is kept low. And when we allow these reaction to take place at higher temperature they favor reactant side.
Endothermic reactions are defined as the reactions in which energy of products is more than the energy of the reactants. In these reactions, energy is absorbed by the system. The total enthalpy of the reaction comes out to be positive.