The combustion of the fatty acid called stearic acid has the the complete equation; C18H36O2(s) + 26O2(g) ------> 18CO2 (g) + 18 H2O(g)
What is combustion?The term combustion has to do with the burning of a substance in air. For organic compounds, we get carbon dioxide and water as the products.
Thus, for the combustion of the fatty acid called stearic acid, the complete equation is; C18H36O2(s) + 26O2(g) ------> 18CO2 (g) + 18 H2O(g)
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A reaction forms a gas at 90.4 ∘C. Report this value using the temperature scale required for gas law calculations and select the correct units for your answer.
The temperature scale required for gas law calculations is Kelvin , The temperature of the gas is 363 in Kelvin.
What is Gas Law ?According to Gas law , for a unit mole of ideal gas the product of pressure to volume is equal to the product of Universal Gas Constant and Temperature.
it is written as
PV = RT
It is given that A reaction forms a gas at 90.4 °C.
The temperature scale required for gas law calculation is Kelvin
Temperature in Kelvin = Temperature in degree Celsius +273
Temperature in Kelvin = 90.4 +273
Temperature in Kelvin = 363 K
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5. The rate of diffusion of a gas depends on its
molecular mass and the temperature.
Which combination of molecular mass and
temperature gives the slowest rate of diffusion?
molecular mass
temperature
A.high
high
B.low
low
C.high
low
D.high
low
Answer:
A
Explanation:
because rate of diffusion is inversely proportional to molecular mass
The combination of high molecular mass and low temperature gives the slowest rate of diffusion.The correct option is c.
When it comes to diffusion, the rate at which a gas spreads out depends on its molecular mass and temperature.
Molecular mass refers to the weight of the gas molecules. The larger the molecules, the slower they move and the slower they diffuse. Therefore, gases with higher molecular mass diffuse more slowly than those with lower molecular mass.
Temperature also affects the rate of diffusion. At higher temperatures, gas molecules have more energy and move faster, resulting in a faster diffusion rate. On the other hand, at lower temperatures, gas molecules have less energy and move slower, leading to a slower diffusion rate.
So, when we combine high molecular mass and low temperature, we have both factors working against a fast diffusion rate. The gas molecules are heavy, which slows down their movement, and the low temperature reduces their energy and speed. As a result, this combination gives us the slowest rate of diffusion.
In summary, the combination of high molecular mass and low temperature gives the slowest rate of diffusion.The correct option is C.
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a student tried to balance a reaction in which iron (II) chloride reacts with potassium phosphate to produce iron (II) phosphate and potassium chloride:
FeCL^2 + K^3PO^4 —> Fe^3(PO^4)2 + KCI
Answer:
Option 1
Explanation:
You need to make the number of each type of atom on both sides the same, and this can only be done by changing the coefficients.
How many significant figures does 7,874.9640 s have?
Submit Question
Answer:
8 significant figures
Explanation:
All numbers (that are not zero) are always significant. Because there is a zero at the end of the number after the decimal place, this makes this zero also significant. This zero is significant because it makes the number more precise. Therefore, all of the numbers in this number are significant.
Answer:
There are 8 sig figs
Explanation:
Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular
theory?
higher temperature → less kinetic energy
higher temperature → more kinetic energy→more space between particles → higher volume
less space between particles → higher volume
higher temperature → more kinetic energy less space between particles → lower volume
higher temperature → less kinetic energy→more space between particles lower volume
The correct sequence is higher temperature→ more kinetic energy→ more space between particles→ higher volume.
According to the postulates of Kinetic gas theory:
Postulate 1: It states that the average kinetic energy of gas particles is proportional to the absolute temperature of the gas.
Which states that the higher temperature, the higher the kinetic energy of the molecules, which is the start of the sequence of the relationship between temperature and volume.
Postulate 2: Average kinetic energy is proportional to the square of the speed, it shows that at higher the kinetic energy the faster the molecules will move.
Postulate 3: As the particles move faster, the particles will collide more frequently so they will move away from each other, occupying more space.
Postulate 4: More space between the molecules results in more volume.
So, the complete and correct sequence is higher temperature → higher kinetic energy (higher speed) → more space → more volume.
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Which buffer can be suitable to prepare a solution that needs to be buffered at ph 4?
Answer:
For pH= 4.00 :
Add 0.1 ml of 0.1 molar NaOH to 50 ml of 0.1 molar potassium hydrogen phthalate .
Step 5: Measure the Mass of the Water (Iron)
Tare the balance. Put calorimeter (no lid) on the balance.
Measure the mass to the nearest 0.01 g.
g
DONE✔
ZERO
Answer:
12.42 g
Explanation:
because I saw your laptop so it is
Different atoms and elementary particles have varied masses. Therefore, 12.42 g is the Mass of the Water.
What is mass?A body's mass is an inherent quality. Before the invention of the atom or particle physics, it was widely considered to be tied to the amount of matter inside a physical body. It was discovered that, despite having the same quantity of matter in theory, different atoms and elementary particles have varied masses.
There are various conceptions of mass in contemporary physics that are theoretically different but physically equivalent. The resistance of the body to acceleration in the presence of a net force can be measured experimentally as mass. 12.42 g is the Mass of the Water.
Therefore, 12.42 g is the Mass of the Water.
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how many moles of potassium iodide (KI) are in 48.9 g of potassium iodide (KI) ? ____ moles
Answer:
mass of kI = 74.55 Atomic mass
74.55 g ---> 1 mole
48.9 g --> ?
48.9 / 72
0.7 mole.
In one mole of kI --->
Which quantity could best be measured with a meter stick?
A.
the amount of matter in a rock
B.
the width of a wooden block
C.
the volume of water in a cup
D.
the diameter of the Earth
Answer:
B
Explanation:
A meter stick measures distances ( like centimeters) so....B
it does NOT measure mass , volume or VERY large distances (Like earth's diameter)
The quantity could best be measured with a meter stick will be "the width of a wooden block".
What is meter stick?The measurement tool is known as a "meter stick" would be used to measure objects in meters and millimeters.
What is wooden block?A single new piece of wood would be used to create a miniature slit drum known as a wood block.
An instrument for measuring lengths in meters and centimeters is a meter stick, which measures one meter (hundred centimeters). A meter stick can be used to measure things such as the width of a bag or the length of a table.
The quantity that could best be measured with a meter stick will be "the width of a wooden block".
Therefore, the correct answer will be an option (b)
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How many taste buds are present on the tongue? Name them.
there are five Taste bud present tongue they are -
SWEET SALT SOUR BITTER UMAMI ______________________out of the four type of papillie present on tongue the fungiform circumvallate and folite papillie contain numerous small taste but few such type of Taste but also occur in the mucous membranes of soft palate tonsils and epiglottis all of these days but received taste is normally
each Taste bud is an oval structures formed due to modification of epithelial cells which are situated erect and vertically on the surface long sensory cells and supporting cells are found in this bird is sensory cell is spindle shaped in which a sensory here is found at its free in the century fibre of the facial and vagus cranial nerves are wrapped around the basal and of the gustatory cells each test but open on the epithelial surface through minute taste pore
____________________Corrosion may be regarded as the destruction of metal by:
Electrochemical action
Hydroelectric action
Electromechanical action
All of the above
At STP, 2.24 L of carbon dioxide gas is collected. What is the number of molecules of gas present in this volume?
a. 6.02 × 1022
c. 1.24 × 1024
e. 3.62 × 1024
b. 6.02 × 1023
d. 1.81 × 1024
Considering the definition of STP conditions and Avogadro's number, the number of molecules of gas present in 2.24 L is 6.023×10²² molecules.
Definition of STP conditionThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Definition of Avogadro's numberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of molecules of carbon dioxide gasAt STP, 2.24 L of carbon dioxide gas is collected. So, you can apply the following rule of three: if by definition of STP conditions 22.4 L are occupied by 1 mole of carbon dioxide gas, 2.24 L are occupied by how many moles of carbon dioxide gas?
[tex]amount of moles of carbon dioxide gas=\frac{2.24 Lx1 mole}{22.4 L}[/tex]
amount of moles of carbon dioxide gas= 0.1 moles
Finally, 0.1 moles of carbon dioxide gas are collected.
Then you can apply the following rule of three, considering the Avogadro's number: If 1 mole of carbon dioxide gas contains 6.023×10²³ molecules, 0.1 mole of carbon dioxide gas contains how many molecules?
amount of molecules of carbon dioxide gas= (6.023×10²³ molecules × 0.1 moles)÷1 mole
amount of molecules of carbon dioxide gas=6.023×10²² molecules
Finally, the number of molecules of gas present in 2.24 L is 6.023×10²² molecules.
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why is it important to record all accidents and breakages that occur in the laboratory
It is important to record all accidents and breakages that occur in the laboratory to prevent them from happening again.
What is laboratory accident?Laboratory accident is defined as the type of accident that occurs in the laboratory leading to harm.
Example of laboratory accidents include the following:
chemical burns, cuts from broken glass, inhalation of toxic fumes, absorption of chemicals through the skin, and ingestion of toxic chemicals.A record of these type of laboratory accidents would hel prevent it's reoccurrence.
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Convert -145 °F to kelvins. Round to the nearest whole number.
Answer:
175K
Explanation:
(-145°F − 32) × 5/9 + 273.15 = 174.817K
174.817 ---> 175 (Rounded to whole number/ ones place)
A temperature of 300 Kelvin is how many degrees Celsius?
A. 273
B. 27
C. 573
D. 300
Answer:
The answer is B, to convert kelvin to temperature you :
Subtract 273 (k - 273)
Calcular la normalidad de 1 Kg de sulfuro de aluminio en 5000 ml de solucion.
Calculate the normality of 1 Kg of aluminum sulfide in 5000 ml of solution.
Normality comes out to be 8.11
Given Mass of solute: 1000gVolume of solution (V): 5000 ml = 5 liters Equivalent mass of solute (E) = molar mass / n-factorn-factor for [tex]Al_{2}S_{3}[/tex] is 6 and molar mass is 148g
So, on calculating equivalent mass is equal to 24.66g
FORMULAE of Normality (N) = (Mass of the solute) / (Equivalent mass of the solute (E) × Volume of the solution (V)
N=[tex]\frac{1000}{24.66*5}[/tex]
N=8.11
Therefore, normality of 1 kg aluminum sulfide is 8.11
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Which combination is not a buffer?
NaCN + HCN
NH3 + NH4Cl
CH3COOH + CH3COONa
NaCl + HCl
The combination in Option D , NaCl + HCl is not a buffer
What is a Buffer ?A buffer is a solution which is added to resist changes in pH when a small amount of acid.
It is generally made of weak base with its conjugated acid , weak acid with its conjugated base.
A buffer comes with a defined with a capacity .
Among the given option the solution mixture which is not a buffer is
NaCl + HCl
as a buffer is not made of a strong acid and its salt.
Therefore Option D is not a buffer.
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Explain how to get it Thanks
The Ammonia present in 2.5 mole of Ammonia is 42.5grams.
What is a mole ?A mole is a measuring unit in Chemistry to measure the number of atoms in certain molar mass of a substance.
It is given that 2.5 mole of Ammonia is present
Grams of Ammonia present in 2.5 mole of Ammonia = ?
Molecular weight of Ammonia = 17 grams.
1 mole of Ammonia = 17 grams of Ammonia
2.5 mole of Ammonia = 17 * 2.5
= 42.5 grams
Therefore 42.5 grams of Ammonia is present in 2.5 mole of Ammonia.
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What is gravitational potential energy?
OA. Energy stored in atoms
B. Energy of motion
C. Energy stored in height differences
D. Energy from light
Answer:
c.
Explanation:
gravitational potential energy describes the amount of energy something could have based off of the amount of gravity acting on the object. so energy stored in height difference would be the best answer because gravity is acting on those objec6s
What is the ph of a peach with a [ –oh] = 3.2 × 10 –11 m?
Fill in the blank with the correct number to balance the equation: 4AI +____O2 → 2Al₂O3.
(Enter only a whole number.)
Answer: 3 O2
Explanation:
4AI +____O2 → 2Al₂O3.
In the product, Al and O3 are one chemical now and therefore BOTH impacted by the coeffcient in front of the Al which is 2. We know the coefficient is 2 and there are 3 molecules of O meaning that there are 6 molecules of O in the product. To balance this, there should be 6 molecules of O on the reactant side, the same way there is 4 Al molecules on both sides of the reaction. So 6 divided by 2 is 3 so put a 3 in the blank.
describe what happens when two substances at different tempatures come into contact. describe how the law of conservation of energy applies to this system
If two objects at different temperatures are brought in contact with each other, energy is transferred from the hotter object to the colder object.
What is the law of conservation of energy?The total energy of an isolated system remains constant irrespective of whatever internal changes may take place with energy conevrting in one form and reappearing in another.
When two substances at different temperatures come into contact, the substance with a higher temperature will transfer heat energy to the substance with a lower temperature, until their temperatures get equal.
Here, if the two substances are isolated then the law of conservation of energy states that the when heat released by the substance with a higher temperature is the same amount of heat gained by the substance lower a lower temperature.
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How is the Sun classified?
as a giant star
as a medium star
as a white dwarf
as a neutron star
Answer:
B.) As a medium star
Explanation:
A.) is incorrect. It is not a giant star because there a millions are stars which are much more massive.
B.) is correct. Our Sun has a radius of about 437,000 miles. Technically our Sun is classified as a G-type main-sequence star, aka. yellow dwarf star. The Sun is generally classified as this type of star.
C.) is incorrect. While the Sun's light is similar to the light of white dwarf, it is still most certainly classified as a yellow dwarf star.
D.) is incorrect. Neutrons stars are collapsed, incredibly dense stars. They are around the size of a city.
Answer:
b
Explanation:
took the test
How many moles of H2 are needed to react with 4.8 mol of O2 ?
Answer:
9.6 mol
Explanation:
Start by writing out the balanced equation of the reaction.
2[tex]H_{2}[/tex] + [tex]O_{2}[/tex] ⇒ 2[tex]H_{2}O[/tex]
Here you will see 2 mol of hydrogen for every 1 mol of oxygen. Using this ratio, you can assume the amount of hydrogen will always be double that of oxygen. In this case, 4.8 * 2 = 9.6
Determine the trends in radii for the following ions and atoms: Mg2+, F- , Ne, and Na+ .explain your choice
The trend for the radii is Mg²⁺ < Na+ < Ne <F⁻
What does Ionic size varies with number of protons ?With the increase in number of protons in the nucleus the electrons are more attracted towards nucleus and so the ionic radius decreases.
Ionic size increases with the addition of electrons and ionic size decreases with the loss of electrons.
Higher is the atomic number, higher will be the effective nuclear charge, lower will be the size.
F⁻
no. of proton=9
no of electron = 10
Na+
no. of proton=11
no of electron=10
Mg²⁺
no. of proton=12
no of electron=10
Ne
no. of proton=10
no of electron=10
Mg²⁺ < Na+ < Ne <F⁻
Therefore the trend for the radii is Mg²⁺ < Na+ < Ne <F⁻
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What is the mole fraction of NaBr in
an aqueous solution that contains
20.1% NaBr (weight/weight %)?
Molar Mass
NaBr: 102.89 g/mol
H₂O: 18.016 g/mol
Enter text here
Answer:
4.22% NaBr
Explanation:
To find the mole fraction of NaBr, you need to (1) determine the mass of the solute (NaBr) and the solvent (H₂O), then (2) convert the mass of the solute and solvent to moles (via the molar masses), and then (3) calculate the mole fraction of NaBr. The final answer should have 3 sig figs to match the sig figs of the given value (20.1%). Because you are given a percent less than 100%, you can assume that the percent (20.1%) is equal to the mass of the solute (20.1 g).
(Step 1)
100% - 20.1 % NaBr = 79.9% H₂O
20.1% NaBr = 20.1 g NaBr
79.9% H₂O = 79.9 g H₂O
(Step 2)
Molar Mass (NaBr): 102.89 g/mol
20.1 g NaBr 1 mole
------------------- x --------------------- = 0.195 mole NaBr
102.89 g
Molar Mass (H₂O): 18.016 g/mol
79.9 g H₂O 1 mole
------------------ x ------------------- = 4.43 moles H₂O
18.016 g
(Step 3)
moles of solute
Mole Fraction = ---------------------------------------------------- x 100%
moles of solute + moles of solvent
0.195 mole NaBr
Mole Fraction = -------------------------------------------------------- x 100%
(0.195 mole NaBr) + (4.43 moles H₂O)
Mole Fraction = 4.22% NaBr
Answer:
0.0422
Explanation:
Right on Acellus
what are the condition for a gas like carbon (II) oxide to obey the gas laws?
Answer:
I don't know the answer, but I can give options :)
Explanation:
A gas such as carbon monoxide would be most likely to obey the ideal gas law at:
Option 1) High temperatures and low pressure.
Option 2) Low temperatures and high pressure.
Option 3) High temperatures and high pressure.
Option 4) Low temperatures and low pressure.
Answer:
The gas must occupy 0 volume at -273°celcius
The pKb value for aqueous ammonia at 25
is 4.8.
What is the correct pKa value for the ammonium ion at this temperature? (Kb denotes the base dissociation constant and Ka denotes the acid dissociation constant.)
The value of pka for [tex]NH_3[/tex] in an aqueous solution is 9.2.
What is Kb?Kb denotes the base dissociation constant.
pKa + pKb =14 at 25 degree celcius.
pKa + 4.8 =14
pKa = 9.2
pKb is the negative base-10 logarithm of the base dissociation constant (Kb) of a solution.
It is used to determine the strength of a base or alkaline solution.
The value of pka for [tex]NH_3[/tex] in an aqueous solution is 9.2.
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Which element tends to gain electrons to form an anion
A. S
B. Na
C. Mn
D. Ba
Answer:
A.) S
Explanation:
Anions form when elements have more electrons than protons. Some elements want to gain electrons because all elements desire a full octet (8 valence electrons). That being said, some elements are closer to a full octet by gaining electrons, whereas some are closer when they give up electrons.
As a general rule, as you move to the right across the period table, the number of valence electrons an element has increases. Therefore, on the right of the periodic table, these elements have a little less than 8 valence electrons. It makes sense that these elements want to gain those last few electrons to gain a full octet, rather than giving up electrons. Sulfur (S) has 6 valence electrons (located in the 16th column). To gain a full octet, it will gain two electrons and thus become an anion.
Na, Mn, and Ba are on the left of the periodic table, so they'd rather give up electrons than gain them (to become cations).
Calculate the moles for C. and D. in the attached picture:
The moles of nitrogen (iv) oxide produced in C and D are 0.284 moles and 68.32 moles respectively.
What is the mole ratio of the reaction?The mole ratio of the given reaction shows that 2 moles of dinitrogen (v) oxide produces 4 moles of nitrogen (iv) oxide when it decomposes.
B of dinitrogen (v) oxide in 15.4 g is calculated below:
Molar mass of dinitrogen (v) oxide = 108 g/mol
Moles of dinitrogen (v) oxide = 15.4/108 = 0.14 moles
Moles of nitrogen (iv) oxide produced = 0.142 * 2 = 0.284 moles
Moles of dinitrogen (v) oxide in 3.69 kg is calculated below:
Molar mass of dinitrogen (v) oxide = 108 g/mol
Mass = 3.69 kg = 3690 g
Moles of dinitrogen (v) oxide = 3690/108 = 34.16 moles
Moles of nitrogen (iv) oxide produced = 34.16 * 2 = 68.32 moles
Therefore, the moles of nitrogen (iv) oxide produced in C and D are 0.284 moles and 68.32 moles respectively.
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