A sample of rainwater with a pH of 3.5 is sure to contain a large concentration of [tex]H_3O^+[/tex]
pH scaleA pH value of 7 downward is said to be acidic. Upward of 7 is said to be basic. A pH of 7 on the dot is said to be neutral.
An acid is defined as a substance that produces [tex]H_3O^+[/tex] as its only positively charged ion in solution.
Thus, rainwater with a pH of 3.5 is acidic and will contain a high concentration of [tex]H_3O^+[/tex].
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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
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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provide an example of unit conversion utilizing the process of dimensional analysis
Answer:
See below
Explanation:
1 year is how many seconds ?
1 year :
365 days/ yr * 24 hours / day * 60 min/ hour * 60 seconds/ min
=====
see how the 'days' 'hours' 'min' all cancel and you are left with
'seconds' / 'year' ? = 31 536 000 seconds/year
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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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)
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)
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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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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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
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:
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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What is the role of a catalyst in a chemical reaction?
A increase the concentration of reactants
B increase the rate of the reaction
C increase the temperature of a reaction
D increase the pressure applied to the reaction
A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy without itself being consumed by the reaction.
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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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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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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What is the osmotic pressure, in atm, of a 0.287 M solution of MgCl2 at
37.0 °C? (assume complete dissociation).
Answer:
Π = 21.9 atm
Explanation:
The equation used to find osmotic pressure is:
Π = iMRT
In this formula,
>> Π = osmotic pressure (atm)
>> i = van't Hoff factor
>> M = molarity (M)
>> R = constant (0.0821 atm*L/mol*K)
>> T = temperature (K)
Remember, van't Hoff factor is the amount of ions the species (MgCl₂) dissociates into while in solution. MgCl₂ dissociates into 3 ions. These ions are Mg²⁺ and 2 Cl⁻.
The temperature needs to be in Kelvin....
37.0 °C + 273.15 = 310.15 K
You now know the value of all the variables.
Π = iMRT
Π = (3)(0.287 M)(0.0821 atm*L/mol*K)(310.15 K)
Π = 21.9 atm
If you had 6 mol of oxygen and 12 mol of mercury, what would be the limiting reactant? show your work
The limiting reactant between the reaction of 6 moles of oxygen and 12 moles of mercury is mercury (Hg)
Balanced equation4Hg + O₂ —> 2Hg₂O
From the balanced equation above,
4 moles of Hg reacted with 1 mole of O₂
How to determine the limiting reactantFrom the balanced equation above,
4 moles of Hg reacted with 1 mole of O₂
Therefore,
12 moles of Hg will react with = 12 / 4 = 3 moles of O₂
From the above calculation, we can see that only 3 moles of O₂ out of 6 moles given is required to react completely with 12 moles of Hg.
Thus, Hg is the limiting reactant and O₂ is the excess reactant .
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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.
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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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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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
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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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
What is CH3-CH3 in a compound name?
Answer:
CH3-CH3 in a compound name is Ethane
Explanation:
hope it will help you
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 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 --->
A dunk tank hold 30,533 moles of water? How many grams of water are in the tank?
Which of the following separation techniques uses boiling points to separate the components of a mixture:
a. Filtration
c. Chromatography
b. Distillation
d. Magnetism
Option (b) is correct.
Some separation techniques are given below:- (a) FiltrationA separation technique called filtration is used to isolate pure chemicals from mixtures of particles, some of which are big enough to be caught by a porous medium.
(b) DistillationThe separation of combinations of two or more pure liquids is accomplished through distillation. The components of a liquid mixture are vaporized, then condensed and isolated during the purifying process of distillation.
(c) ChromatographyChromatography is the process of separating a mixture by passing it through a medium where the components move at various speeds, either in solution, suspension, or as a vapor (as in gas chromatography).
(d) MagnetismThe magnetic separation process involves attracting magnetic materials using a magnet to separate the components of mixes. Non-magnetic compounds are separated from magnetic ones using the magnetic separation technique.
From the above separation techniques, we can say that option(b) Distillation a separation process that uses boiling points to separate the component of a mixture is correct.
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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).
