NaOH reacts with benzoic acid to form sodium benzoate therefore, aqueous NaOH is a bad choice for the recrystallization of benzoic acid.
Recrystallization is a process of obtaining a pure solute by dissolving a solute in a solvent at high temperature and cooling the solution rapidly so that the pure solute can crystallize out of solution.
It is important to note that the solute must not react with the solution from which it is to be recrystallized. Unfortunately, NaOH reacts with benzoic acid to form sodium benzoate therefore, aqueous NaOH is a bad choice for the recrystallization of benzoic acid.
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The change in internal energy for the combustion of 1.0 molmol of octane at a pressure of 1.0 atmatm is -5084.1 kJkJ . Part A If the change in enthalpy is -5074.4 kJkJ , how much work is done during the combustion
Answer:
W = -10.3 kJ
Explanation:
During combustion, the system performs work and releases heat. Therefore, the change in internal energy is negative, and the change in enthalpy, which is equal to heat at constant pressure, is also negative. Work is then calculated by rearranging the equation for the change in internal energy:
w=ΔE−qp=−5084.3 kJ−(−5074.0 kJ)
The release of heat is much greater than the work performed by the system on its surroundings. The potential energy stored in the bonds of octane explains why considerably large amounts of energy can be lost by the system during combustion.
The work done during the combustion is mathematically given as
w= −10.3kJ
What is the work done during the combustion?Question Parameter(s):
The change in internal energy for the combustion of 1.0 molmol of
octane at a pressure of 1.0 atmatm is -5084.1 kJkJ .
Generally, the equation for the workdone is mathematically given as
w=ΔE−qp
w=−5084.3 kJ−(−5074.0 kJ)
w= −10.3kJ
In conclusion, the work done
w= −10.3kJ
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I’ll give 5 stars and Brainliest plus this is 20 points lol
Answer:
I think is b
Explanation:
Any observations collected from Parts A and B were obtained by testing solutions with a single cation present. Would the presence of two cations in one solution (like that of the unknown) affect the cation identification in Part C?
Answer:
Yes
Explanation:
The two cations in the unknown can react with the reagent added for a particular test. The observation of the reaction for one cation can mask the other cation in solution making it difficult to identify either cation.
An ion carrying a positive charge is called a cation. The presence of two cations in a solution will affect the identification of cations in the C part.
What is a qualitative analysis of cation?In the qualitative analysis the chemical and the analytical process of identification of the ions in a mixture of sample solution. The cations and the anion gets separated in a mixture by the addition of a particular reagent.
The presence of two cations in an unknown mixture can alter and interfere with the reagent added to detect the third cation. The cation can mask and hinder the presence of another cation in the mixture by reacting with it.
Therefore, yes the two cations can affect the identification of the third cation.
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What causes anions to have a negative charge a the gaining of electrons b the loss of electrons c the gaining of protons d the loss of protons
Answer:
Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.
False and Ture
Air is denser
near Earth's
surface than
high in the
atmosphere.
Answer:
Wind is the movement of air from an area of low pressure to an area of high pressure. TRUE. As you move upward from Earth's surface, wind speeds increases because the air meets with less friction from Earth's surface.
How many grams of sodium metal are needed to react with 40.1 grams of hydrochloric acid?
Answer:
23.1 grams of sodium is use for this kind of stuff
How many atoms of each element in the following chemical equation:
3 CO + 8 H2O + 4 SO2
+
C =
0 =
H =
S =
C-3
(3CO)
O-19
(3CO)+(8H²O)+(4SO₂)
H-16
(8H₂O)
S-4
4(SO₂)
Radioactive iodine, used to treat thyroid cancer, has a half-life of eight days. Find its decay constant, r.
The decay constant of the radioactive iodine is r =0.086625
Radioactive decay is defined as the spontaneous reaction which occurs when an unstable atomic nuclei disintegrates form more stable nuclei.decay constant shows how the rate of the size of the parent nuclei decreases with time due to radioactive decay.
Now,
Let N be the size of a population of radioactive atoms at a given time t, and dN, the amount by which the population decreases in time dt
So that the rate of change is given by
dN/dt = −λN, ((where λ is the decay constant).
By Integration, We have
N = N0e−λt, ( where N0 is the size of an initial population of radioactive atoms at time t = 0)
We can see that the population decays exponentially which is dependent on the decay constant.
Now the half life is defined as the time it will take for half of the original population of radioactive atoms to decay.The relationship between the half-life, T1/2, and the decay constant, λ. is given by T1/2 = 0.693/λ.Therefore, for a radioactive iodine with half life of 8days , The decay constant will be
λ = 0.693/ T1/2 or
r = 0.693/ T1/2
r = 0.693/ 8days
r =0.086625
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50 POINTS !! I have a science project that I need help with its called pH
Project: Researching Acid Rain if anyone knows the answer or has down it before let me know.
Answer:
Acidic solutions are measured to have lower pH values than basic or alkaline solutions.
Explanation:
So basically acids have a lower pH than other liquids like water.
A foliation
B. grains
C. igneous rock
D. lava
E lithification
1. a naturally occurring solid mixture made of
minerals, rock fragments, organic matter, or glass
2. the individual particles in rocks
3. type of rock that forms when magma or lava
cools and hardens
4. molten rock found inside Earth
5. molten rock that erupts onto Earth's surface
6. type of rock made of layers that are pressed or
cemented together
7. process through which sediment turns into rock
8. type of rock that results from changes that occur
in existing rocks
9. name for the original rocks that are changed into
metamorphic rocks
10. Metamorphic rock sometimes has this layered
appearance.
F.
magma
G. metamorphic
H. parent rock
i rock
J. sedimentary
Answer:
B.Grains
Explanation:
H.parent rock
Describe the difference between at atom and an ion in regards to their substaomic
particles.
Answer:
-Atoms are neutral; they contain the same number of protons as electrons. By definition, an ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion.
-An atom has an equal number of protons and electrons. An ion has an imbalance between the number of protons and electrons.
-An atom has no electrical charge. Ions have an electrical charge because they have an imbalance of protons and electrons.
Explanation:
A cheerful teen willing to help,
wishing you a splendiferous day,
stay salty...
It’s 10pm at 45°W. What time will it be at 45°E?
Answer:
11:30am
Explanation:
45 + 45 = 90
90 = 1 hrs 30 mins
10 pm + 1 hrs 30 mins
= 11:30 am
The process of releasing energy through the spitting of an atom is:
Answer:
When an atom splits into two parts, either through natural decay or when instigated within a lab, it releases energy. This process is known as fission.
Explanation:
Fission
A foliation
B. grains
C. igneous rock
D. lava
E lithification
1. a naturally occurring solid mixture made of
minerals, rock fragments, organic matter, or glass
2. the individual particles in rocks
3. type of rock that forms when magma or lava
cools and hardens
4. molten rock found inside Earth
5. molten rock that erupts onto Earth's surface
6. type of rock made of layers that are pressed or
cemented together
7. process through which sediment turns into rock
8. type of rock that results from changes that occur
in existing rocks
9. name for the original rocks that are changed into
metamorphic rocks
10. Metamorphic rock sometimes has this layered
appearance.
F.
magma
G. metamorphic
H. parent rock
i rock
J. sedimentary
Answer:d
Explanation:
Compare the reactivity between lithium and sodium towards oxygen.
When converted to a household measurement, 9 kilograms is approximately equal to a) 9000 grams. b) 9000 ounces. 19.8 ounces. d) 19.8 pounds.
Answer:
D 19.8
Explanation:
1kg in household measurement is equal to 35.274 Oz 35.274*9=317.466 Oz
1 KGS is also equal to 2.205 lbs 9*2.205=19.8416
When converted to a household measurement, 9 kilograms are approximately equal to 19.8 pounds. Therefore, option D is correct.
What is pound ?The British imperial and American customary systems of measurement both utilize the pound as a unit of mass. It is stated that a kilogramme (kg) weighs 2.2 times more than a pound (represented as lbs). As a result, 2.26 pounds equal one kilo of mass.
The pound has strong connections with Britishness, yet it also has roots in continental Europe. Its name, Libra Pondo, which translates as "a pound weight," comes from the Latin word Libra, which means weight or balance.
Approximately 0.45359237 kilogrammes make up one pound (kg). The provided pound value is multiplied by 0.45359237 to convert a pound to kilograms. Additionally, a kilogramme is about equivalent to 2.2046226218 pounds.
1kg in household measurement = 35.274 Oz 35.274 * 9
=317.466 Oz
1 KGS = 2.205 lbs 9 * 2.205
= 19.8416
Thus, option D is correct.
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What is the definition of Feild
Answer:
the printed pattern from a reticle
Explanation:
field, In physics, a region in which each point is affected by a force.
name the type of reaction involved in the conversation of ethanol to Ethan
Atoms are thermally promoted to the excited state through collisions in the plasma. As they return to a lower energy state, they emit photons.
a. True
b. False
Answer:
True
Explanation:
A product has a ingredients of: Aqua, Isopropyl Alcohol, Betaine, Tocopheryl Acetate, Niacinamide, Sodium Starch Octenylsuccinate, Calcium Patothenate, Maltodextrin, Sodium Ascorbly, Phostate, Pyridoxine Hydrochloride, Silica, Poly(hexamethylenebiguanide) Hydrochloride, fragrance.
List three (3) elements present and write it's electron configuration.
Answer:
Explanation:
NUMBER ELEMENT ELECTRON CONFIGURATION
1 Hydrogen 1[tex]1s^{1}[/tex]
2 Helium [tex]1s^{2}[/tex]
3 Lithium [Helium] [tex]2s^{1}[/tex]
Question 14 of 25 A certain mass of nitrogen gas occupies a volume of 4.44 L at a pressure of 5.80 atm. At what pressure will the volume of this sample be 6.82 L? Assume constant temperature and ideal behavior.
I will mark brainlist
What is the concentration of a solution that contains 12 moles of solute in 4 liters of solution?
• 6M
• 12M
• 7M
• 3M
Answer:
Molarity of a solution is defined as number of moles of solute per litre of solution.Mathematically we can write
molarity = (number of moles of solute) / (volume of solution in litres)
It's units are mol/L also denoted by M.
So for this question answer is 6/2 =3mol/L Or 3M
OXIDATION ELECTRON TRANSFER
which phrase best describes oxidation?
gain of cations
gain of electrons
loss of electrons
loss of cations
Answer:
Loss of electrons
Explanation:
Oxidation occurs in a redox reaction where electrons are transferred from one reactant to another.
The loss of electrons is called oxidation.The gaining of electrons is called reduction.The reactant that causes oxidation is called the oxidizing agentThe reactant that causes reduction is called the reduction agentOxidation reaction can be described as the loss of electrons. Therefore, option (C) is correct.
What is oxidation?Oxidation can be described as a chemical reaction that takes place in an atom or compound and results in the loss of electrons.
Oxidation is the loss of electrons and happens when an atom or chemical compound loses one or more electrons. Some elements have a tendency to lose electrons more easily than others and are said to be easily oxidized. Metals such as magnesium, sodium, and iron are easily oxidized.
Elements that are reluctant to lose electrons are not easily oxidized they hold tightly their electrons. Nonmetals such as oxygen, nitrogen, and chlorine are not easily oxidized.
Most of the time, oxidation takes place with a process called reduction. The reduction can be defined as the process of gaining electrons. In an oxidation-reduction reaction, one atom or compound will give or take electrons from another atom or compound.
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A kind of kinetic energy that moves in waves and can be seen
Answer:
Radient energy
Explanation:
Radiant energy is the type of energy that travels by waves.
If an element has Atomic number 25, and Atomic mass 55. What element is this one? Write the name and the symbol
Answer:
Manganese
Explanation:
Mn
Help me out please !!
PLS HELP ME I WILL GIVE BRAINIEST 20 POINTS !!!
26 Milkweed contains a poison known as cardenolides. Monarch butterflies eat the milkweed plant and hold on to this toxic compound. The
chemical formula for cardenolides is shown below.
CH18C20H15CHCO2
Problem
How many atoms of each element are in one molecule of cardenolides?
A
42 carbon atoms, 23 hydrogen atoms, and 2 oxygen atoms
B
20 carbon atoms, 33 hydrogen atoms, and 2 oxygen atoms
с
34 carbon atoms, 43 hydrogen atoms, and 2 oxygen atoms
D
23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms
please help ASAP !!
Answer: D
Explanation:
The subscript on each element tells us the number of atoms.
Adding up all the numbers directly after C we get 23.
Adding up all the numbers directly after H we get 34.
Adding up all the numbers directly after O we get 2.
Using the first equation in HQ11.43, how grams of O2(g) will be needed to produce 55.0 kJ of heat if reacted in excess H2(g)
A reduction in the mass of oxygen available to react with the hydrogen,
reduces the heat produced.
The mass of O₂(g) needed to produce 55.0 kJ if reacted in excess H₂(g) is approximately 3.08 grams.Reasons:
The chemical equation for the reaction obtained online is presented as
follows;
[tex]\displaystyle H_2(g) + \frac{1}{2} O_2 (g) \longrightarrow H_2O(g), \ \Delta H^{\circ} = -285.82 \, kJ[/tex]
From the above equation, one mole of H₂ reacts with half [tex]\left(\dfrac{1}{2} \right)[/tex] mole of O₂
to produce 285.82 kJ.
Therefore;
[tex]\displaystyle 55.0 \, kJ \ will \ be \ produced \ by \ \dfrac{55.0}{285.22} \times\dfrac{1}{2} = \frac{1375}{14291} \approx 9.62 \times 10^{-2} \ moles \ of O_2[/tex]
Molar mass of O₂ = 31.999 g/mol
Mass = Number of moles × Molar mass
Mass of oxygen gas, O₂, required, m, is therefore;
m = 9.62 × 10⁻² moles × 31.999 g/mol ≈ 3.08 grams
The mass of O₂(g) needed to produce 55.0 kJ if reacted in excess H₂(g), m ≈ 3.08 gramsLearn more here:
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The equation in HQ 11.43 as obtained online is presented as follows;
[tex]\displaystyle H_2(g) + \frac{1}{2} O_2 (g) \longrightarrow H_2O(g), \ \Delta H^{\circ} = -285.82 \, kJ[/tex]
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Answer:
I'm not the animal Crossing
There are eight elements in the second row (lithium to neon) of the periodic table.
Answer:
lithium, beryllium, boron, carbon, oxygen, fluorine and neon
Explanation:
There are eight elements in the second row (lithium to neon) of the periodic table as the second row can has 2 shells and second shell has maximum capacity of 8 electrons.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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