Molecule is a chemical substance that cannot be broken down into another chemical substance.
Answer:
The correct answer is A. An element.
Explanation:
An element is a chemical substance that cannot be broken down into another chemical substance.
Answer: -
1.8
End point passed.
Explanation: -
Volume of HI solution = 47.0 mL = 0.047 L
Strength of HI solution = 0.47 M
Since HI is a strong acid, all of HI will dissociate to give H +.
[H+ ] =0.47 M x 0.047 L
= 0.02209 mol
Volume of KOH = 25.0 mL = 0.025 L
Strength of KOH = 0.25 M
Since KOH is a strong base, all of KOH will dissociate to give OH-.
[OH-] = 0.25 M x 0.025L
= 0.00625 mol
Since [H+] and [OH-] react to form water,
[H+] unreacted = 0.02209 – 0.00625 = 0.01584 mol
Using the formula
pH = - log [H+]
= - log 0.01584
= 1.8
As the strong acid HI is being titrated by strong base KOH, the pH at the end point should be 7.
The pH has already crossed that. Thus the titration end point has already passed
After titration, there are more moles of HI than KOH, implying excess HI (acid) is present. The remaining acid concentration is 0.2 M and consequently, the final pH of the solution is approximately 0.70.
In the case of the titration of a 47.0 mL of 0.47 M HI solution with 25.0 mL of 0.25 M KOH, we first need to understand that HI is a strong acid and KOH is a strong base. When we titrate a strong acid with a strong base, the equivalence point occurs at a pH of 7.0.
First, we calculate the moles of the acid and the base: moles of HI = 0.47 mol/L * 0.047 L = 0.02209 mol, and moles of KOH = 0.25 mol/L * 0.025 L = 0.00625 mol. Since there are more moles of HI than KOH, we will have extra HI left after the titration. Hence, it is a strong acid-strong base titration before the equivalence point i.e. when we have excess acid.
The remaining acid concentration is (0.02209 mol - 0.00625 mol) / (0.047 L + 0.025 L) = 0.2 M and pH of a strong acid is basically the negative logarithm of the acid's concentration. Therefore, the pH is -log[H+] = -log(0.2) = approx. 0.70.
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A) The product contains no preservatives
B) The product contains more juice than water.
C) The product contains more sugar than juice.
D) The product contains more sugar than any other ingredient.
Answer:
C
Explanation:
C is the only one that is true. Because sugar comes before juice in the ingredients listed, there is more of it.
The temperature of 871.09 Kelvin as stated in the question is approximately -101.06 degrees Celsius.This is obtained by the standard result.
Temperature is often measured in two main scales, Kelvin (K) and Celsius (°C). To convert from Kelvin to Celsius, you need to subtract 273.15 from the given temperature in Kelvin.
This adjustment accounts for the fact that 0 Kelvin (absolute zero) is the point at which all molecular motion theoretically stops, while 0 degrees Celsius is the freezing point of water.
In this case, for the temperature of 871.09 Kelvin, the conversion is as follows:
The temperature in Celsius = 871.09 K - 273.15 ≈ -101.06°C.
This means that a temperature of 871.09 Kelvin is approximately equivalent to -101.06 degrees Celsius. It's important to note that Kelvin is an absolute temperature scale, where 0 K represents absolute zero, while Celsius is a relative scale with 0°C corresponding to the freezing point of water at standard atmospheric pressure.
To know more about Temperature conversion,
In this reaction there is conservation of
(1) mass, only
(2) mass and charge, only
(3) charge and energy, only
(4) charge, energy, and mass
Answer: option (4) charge, energy, and mass.
Justification:
1) Charge, energy, and mass are always conserved in every chemical reaction.
Charge, energy and mass are not created nor destroyed, but can be transferred.
2) The charge can only be transferred by the motion of electrons, so the charge can move and end up on a different atom, but when you add up all the charge is conserved.
The charge balance is verified in the given equation since:
left side right side
(1+) + (1-) = 1 - 1 = 0 0
∴ The total charge of the reactants equals the total charge of the products.
3) As for energy, the right side shows the "apparition" of some energy. That means that the reaction is exothermic, i.e. it releases energy.
The energy released is the net result of the difference in the potencial chemical energy of the bonds of the products and the reactants.
The reactants have more chemical energy stored than the reactants, so potential energy was transformed into heat energy.
4) As for the mass, its conservation is verified when you check that there are the same number of particles of each spieces: two particles of hydrogen in the reactand side, such as in the products; and the particles of oxygen are one in the reactants and one in the products.