How do we lubricate a ground-glass joint?
Answers
A ground-glass joint is a type of seal commonly used in laboratories to connect glassware, such as a flask or condenser. To maintain the integrity of the joint and ensure it works properly, it is important to lubricate it correctly.
There are two common methods to lubricate a ground-glass joint: using a vacuum grease or a silicone grease. Vacuum grease is a type of high-vacuum lubricant that is commonly used in laboratory applications. It is recommended for joints that will be under high vacuum, as it can withstand the pressure and temperature changes.
To lubricate the joint with vacuum grease, apply a small amount of the grease on the male and female sides of the joint, and then twist the two pieces together to distribute the grease evenly. It is important not to apply too much grease, as it can interfere with the joint's seal.
Silicone grease is another option for lubricating a ground-glass joint. It is less viscous than vacuum grease and can be used in a wider range of temperatures. To apply silicone grease, use a small amount on the male and female sides of the joint and twist the two pieces together to distribute the grease evenly.
In summary, when lubricating a ground-glass joint, it is important to choose the appropriate lubricant, apply a small amount, and distribute it evenly for optimal performance.
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Related Questions
how to calculate the maximum concentration that can be present without precipitating
Answers
Calculate the maximum concentration of the compound: Use the stoichiometry from the balanced chemical equation to determine the maximum concentration of the compound that can be present without precipitating.
To calculate the maximum concentration that can be present without precipitating, follow these steps:
1. Identify the solubility product constant (Ksp): First, look up the Ksp value for the specific compound in question. This value represents the equilibrium constant for the dissolving process of the solid into its constituent ions.
2. Write the balanced chemical equation: Write the balanced chemical equation for the dissolution of the solid into its ions, including the coefficients for each ion.
3. Write the expression for the solubility product (Ksp): Write the expression for Ksp using the concentration of the ions and their respective coefficients from the balanced chemical equation.
4. Solve for the maximum concentration of the ions: Rearrange the Ksp expression to solve for the maximum concentration of the ions that can be present without precipitating. This may require some algebraic manipulation, depending on the complexity of the expression.
5. Calculate the maximum concentration of the compound: Use the stoichiometry from the balanced chemical equation to determine the maximum concentration of the compound that can be present without precipitating.
By following these steps, you can calculate the maximum concentration that can be present without precipitating for a specific compound.
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11) A sample of gas has a volume of 823.7 mL and a pressure of 351.8 torr. What volume (in mL) will the gas occupy at 752.9 torr if the temperature of the gas doesn't change? Keep the answer with one decimal place
Answers
Answer:
384.9 mL.
Explanation:
What is given?
Volume 1 (V1) = 823.7 mL.
Pressure 1 (P1) = 351.8 torr.
Pressure 2 (P2) = 752.9 torr.
What do we need? Volume 2 (V2).
Step-by-step solution:
This is a Boyle's Law problem. Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases.
The formula of the law is:
\(P_1V_1=P_2V_2.\)Where P is pressure and V is volume. We want to find volume 2, 'V2'. So let's solve for 'V2' and replace the given data that we have in the new formula:
\(V_2=\frac{P_1V_1}{P_2}=\frac{351.8\text{ torr}\cdot823.7\text{ mL}}{752.9\text{ torr}}=384.882\text{ mL}\approx384.9\text{ mL.}\)The new volumewill be 3384.9 mL You can note as the pressure is increasing, the volume is decreasing.
Consider the van der Waals equation for gases. Identify the correct statement(s). 1. A low value for a reflects weak intermolecular forces among the gas molecules. 2. A high value for a reflects weak intermolecular forces among the gas molecules. 3. Among the gases H2, N2, CH4, and CO2, H2 has the lowest value for a. O1 only 2 and 3 1 and 3 2 only 3 only
Answers
The correct statement(s) regarding the van der Waals equation for gases are a low value for a reflects weak intermolecular forces among the gas molecules and Among the gases H2, N2, CH4, and CO2, H2 has the lowest value for a.
The van der Waals equation is used to describe the behavior of real gases by taking into account their intermolecular forces and non-zero molecular volumes, which are ignored in the ideal gas law. The equation is given by (P + a(n/V)^2)(V - nb) = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, T is the temperature, a is a constant that reflects the strength of the intermolecular forces, and b is a constant that reflects the size of the molecules.
A low value for a indicates weak intermolecular forces among the gas molecules, while a high value for a indicates strong intermolecular forces. Therefore, statement 1 is correct.
Among the gases H2, N2, CH4, and CO2, H2 has the lowest value for a because it has the weakest intermolecular forces among the gases listed. Therefore, statement 3 is also correct.
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a substance must be...
A. a heterogeneous mixture
B. an element or compound
C. a homogeneous mixture
D. an element
Answers
Answer:
I think it would be b
Explanation:
pls correct me if im wrong!
2) Will all atoms behave exactly the same when the temperature is changed?
Answers
no...the atoms will not behave the same
as when temperature is increased, the atoms vibration and kinetic energy will also be increased....they come in excited state...
where as when temperature is reduced ,atoms kinetic energy slows down....
A student is trying to identify an unknown metal X. When he puts it in copper sulphate there is a reaction and red brown pieces of copper fall to the bottom of the test tube. But when he puts metal X into magnesium chloride nothing happens
A) Give two identity of metal X.
B) Out of these two which one is metal X ?
Answers
The unknown metal X is iron metal as it reacts with copper sulfate solution but does not react with magnesium chloride.
What is displacement reaction?Some metals are very reactive while other metals are less reactive or unreactive. When a more reactive metal is added to the solution of a less reactive metal, then the more reactive displaces the less reactive metal from its solution is known as a displacement reaction.
The general form of a single displacement reaction can be represented as:
\(A + BC \longrightarrow B + AC\)
When iron is placed in copper sulfate (CuSO₄) solution then the blue color of the copper sulfate solution turns a red-brown coating of copper metal deposited on the iron.
\(CuSO_4 (aq)+ Fe (s)\longrightarrow FeSO_4 (aq) +Cu(s)\)
Iron lies above the electrochemical series and is more reactive than copper. So it reacts with copper sulfate but does not give any reaction with magnesium chloride.
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1. Imagine doing the same virtual experiment using wood as the bottom material, instead of glass or water. Predict how the light would interact with the wood.
Answers
The wood can't do the same function as done by the water and glass in the same virtual experiment due to its different chemical composition.
The light will not pass through the wood due to its translucent behaviour that prevents light to pass through it as compared to water and glass which are transparent materials and light can easily pass through it.
So using wood as a bottom material instead of glass and water will not perform the same function as perform by water and glass in the same virtual experiment so we can conclude that wood can't perform the same function in the experiment.
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I NEED HELP ASAP PLEASE
Answers
Which body systems help to exchange oxygen and carbon dioxide?
A. respiratory and digestive
B. circulatory and digestive
C. respiratory and circulatory
D. digestive and excretory
Answers
What can you find on the periodic table?
A. the chemical formula for salt
B. the number of hydrogen atoms that are in a molecule of water
C. all the compounds that exist in the universe
D. all the elements that have been discovered
Answers
what is the role of the secondary coolant in a nuclear power plant?
Answers
The secondary coolant is converted to steam, which runs the steam turbine to generate electricity.
Secondary coolant:
creates steam to turn a turbine and generate electricityfluid is cooled by a condenser and recycleddoes not contact the reactorThe reactor coolant flows from the reactor to the steam generator. Inside of the steam generator, the hot reactor coolant flows inside of the many tubes. The secondary coolant, or feedwater, flows around the outside of the tubes, where it picks up heat from the primary coolant.
The secondary system is designed to transport heat from primary system to the atmosphere via an evaporative cooling tower. The typical system is designed to furnish 12.6 m3/min of water to the plate type heat exchanger at an inlet temperature of about 33 °C and an outlet temperature of about 42 °C.
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A radioactive substance decays exponentially. A scientist begins with 170 milligrams of a radioactive substance. After 16 hours, 85 mg of the substance remains. How many milligrams will remain after 21 hours? mg Give your answer accurate to at least one decimal place
Answers
If 170 milligrams of a radioactive substance decays to 85 g after 16 hours. Then, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.
The decay of the radioactive substance follows an exponential decay equation of the form:
\(N(t) = N_{o} \times e^{-kt}\)
Where:
N(t) is the amount of substance remaining at time t
N₀ is the initial amount of substance
k is the decay constant
t is the time elapsed
Given to us is N₀ = 170 mg and N(16) = 85 mg. We can use this information to find the decay constant, k.
\(85 = 170 \times e^{-k \times 16}\)
Dividing both sides by 170:
\(0.5 = e^{-k \times 16}\)
To solve for k, we can take the natural logarithm (ln) of both sides:
ln(0.5) = -k × 16
from this, the value of k comes out to be:
k = 0.0431
Now we can use the decay equation to find the amount of substance remaining after 21 hours, N(21):
\(N(21) = 170 \times e^{-0.0431 \times 21}\)
Calculating this expression:
N(21) = 75.2
Therefore, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.
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Correct answer will be marked brainliest!
Answers
Answer:
0.0660 moles
Explanation:
Change torr to atm and change celcius to kelvin.
(1.35L)(.987 atm)/(0.08206 L atm /mol k)(290k)
= 0.0660 mol
HURRY ITS IS DUE SOON
Answers
Answer:
use the meaning of the word see what is similar and what is different about them
is the kinetic energy due to the random motion of particles in an object
Answers
Answer:
You are correct however there is also potential energy because the energy is released over a period of time.
Hope this helps!
what is the difference between copernicus's and kepler's description of planetary orbits
Answers
While Copernicus rightly observed that the planets revolve around the Sun, it was Kepler who correctly defined their orbits. ... Using these observations, Kepler found that the orbits of the planets followed three laws.
Some bacteria live in the roots of plants like soybeans and peas.
Bacteria growing on plant roots.
What is the role of these bacteria in the nitrogen cycle?
to absorb nitrogen-containing compounds from the soil
to release free nitrogen into the atmosphere
to break down nitrogen-containing compounds in dead organisms
to convert free nitrogen into usable nitrogen
70 points!
Answers
Answer:
to release free nitrogen into the atmosphere. This is the answer.
Answer:
to convert free nitrogen into usable nitrogen
Explanation:
got it right on the test boi
which of the following statements is incorrect? select one: a. the entropy is larger when a disolved salt in a liquid is uniform or spread throughout the liquid than when it is highly concentration in a small portion of the liquid. b. an iron nail at 100oc has more entropy than the same nail at 250oc c. entropy decreases when a gas dissolves in a solvent, mainly because the dissolved molecules are confined to a smaller volume. d. adding heat to a substance always increases its entropy. e. entropy increases in going from the solid to the liquid to the gaseous state. f. when a solid dissolves in a liquid the entropy generally increases because the positional entropy increases. for example, dissolving a sugar cube in water. g. the kinetic energy of the particles in a sample increases as the temperature increases. the disorder increases as the motion of the particles increases. consequently, entropy increases as the temperature increases
Answers
The incorrect statement for entropy is the entropy is larger when a dissolved salt in a liquid is uniform or spread throughout the liquid than when it is highly concentration in a small portion of the liquid. The answer to this question is A..
Change in entropyThe entropy loss from ion binding and hydration decreases with increasing salt concentration, and at a certain temperature, the closure rate then increases noticeably with increasing ion concentration.The straightforward response is that water's entropy rises when salt dissolves in it, reducing the freezing point. A measure of disorder in a substance is called entropy, which is frequently used interchangeably with the word chaos.Entropy rises during the sublimation and evaporation processes, which transform a substance from a solid to a gas or a liquid to a gas. In a similar vein, entropy rises with the dissolution of a solid in water.A substance being divided into several pieces results in an increase in entropy. Due to the solute particles' separation from one another when a solution is generated, the dissolution process increases entropy.For more information on entropy kindly visit to
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the time taken for half the radioactive nuclei in a sample to decay is called the of the nuclide. this value is characteristic of a specific and is not dependent on the number of nuclei present. true or false?
Answers
The time taken for half of the radioactive nuclei in a sample to decay is called the half-life of the nuclide. This value is indeed characteristic of a specific nuclide and is not dependent on the number of nuclei present.
The statement is true. The half-life of a radioactive nuclide refers to the time it takes for half of the radioactive nuclei in a sample to decay. It is a fundamental property of a specific nuclide, meaning that each nuclide has its own unique half-life value. The half-life is constant for a given nuclide and is not influenced by the number of nuclei present in the sample.
The concept of half-life is crucial in understanding radioactive decay and its applications in various fields like radiometric dating, nuclear physics, and medical imaging. The half-life allows scientists to predict how long it will take for a given amount of radioactive material to decay by half. Regardless of the initial amount of radioactive nuclei, the proportion that decays remains the same for each half-life interval.
This property makes the half-life a reliable measure for determining the rate of decay and estimating the age or activity of a radioactive substance.
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Why do you need to combust benzoic acid before testing the "unknown" sample you are interested in? Why do you need to combust more than one sample of the "unknown" you are testing?
Answers
Various samples of the must be combusted in other to obtain a reliable result.
What is a bomb calorimeter?The bomb calorimeter is used to obtain the energy of a sample. This is called the energy equivalent or the energy value of the sample.
Now, we know that the bomb calorimeter is calibrated by the use of benzoic acid hence it must be combusted first to obtain the basic energy value of the calorimeter.
Various samples of the must be combusted in other to obtain a reliable result.
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How many milliliters of 5.0 M NaOH are needed to exactly neutralize 40. milliliters of 2.0 M HCl?
Answers
Answer:
16mL
Explanation:
Using the following formula;
CaVa = CbVb
Where;
Where
Ca = concentration/molarity of acid (M)
Va = volume of acid (mL)
Cb = concentration/molarity of base (M)
Vb = volume of base (mL)
According to the information provided in this question;
Ca (HCl) = 2M
Cb (NaOH) = 5M
Va (HCl) = 40mL
Vb (NaOH) = ?
Using CaVa = CbVb
Vb = CaVa/Cb
Vb = 2 × 40/5
Vb = 80/5
Vb = 16mL
Help with this question on image please thanks
Answers
The time of flight of the 86Q+ ion 1.227 x 10⁻⁵ s.
How to find time of flight?Using the principle of conservation of energy to relate the kinetic energy of the ions to their mass and velocity. Since all of the Q+ ions in the sample have the same kinetic energy:
m₁v₁² = m₂v₂²
where m₁ and m₂ are the masses of two different Q isotopes, and v₁ and v₂ are their corresponding velocities.
Also the formula for the time of flight (TOF) of an ion in a mass spectrometer:
t = d/v
where d is the length of the flight tube, and v is the velocity of the ion.
Combine these two equations to solve for the time of flight of the 86Q+ ion, given the time of flight of the 82Q+ ion:
m₁v₁² = m₂v₂²
v₁ = √(m₂/m₁) × v₂
t₁ = d/v₁
t₂= d/v₂ = d/(√(m₂/m₁) × v₁)
Given that t₁ = 1.243 x 10⁻⁵ s for the 82Q+ ion. Assume that the flight tube length, d, is the same for both ions.
To solve for t₂, we need to find the ratio of the masses of the two isotopes:
m₂/m₁ = 86/82 = 1.0488
Substituting this into the equation for t₂:
t₂ = d/(√(1.0488) × v₁) = (1/√(1.0488)) × t₁
t₂ = (1/√(1.0488)) × (1.243 x 10⁻⁵ s) = 1.227 x 10⁻⁵ s
Therefore, the time of flight of the 86Q+ ion is 1.227 x 10⁻⁵ s.
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Hydrogen and nitrogen react to produce ammonia gas as shown in the following chemical
equation.
N2 + 3H2 - 2NH:
How many grams of hydrogen must react to produce 31.5 grams of ammonia?
Answers
Explanation:
\(31.5 \: g \: aommnia \: \times \: \frac{1 \: mol \: ammonia}{8 \: g \: ammonia \: } \: \times \frac{3 \: mol \: hydrogen}{2 \: mol \: ammonia} \: \times \frac{1 \: g \: hydrogen}{1 \: mol \: hydrogen} = \: 5.90625 \: g \: hydrogen \: must \: react \: \)
HELP PLEASEE I WILL GIVE BRAINLIEST
Classify each characteristic according to whether it is true for an amoeba, a clock, or both.
Answers
Answer:
Amoeba: reproduces
clock: lacks genetic material
both: has defined boundary, use energy, and have an internalized organization.
Explanation:
Amoeba is a single cell organism known as amoeboid which is a eukaryotic cell and has all the eukaryotic features such as membrane-bound organelles including the nucleus. The nucleus contains the genetic material of the amoeba cells and which is transferred to the offspring by reproduction. The cell membrane is the outer boundary of the cell use energy to perform its cellular functions.
A clock is a non-living thing that contains many small parts to make it work properly and requires energy to work. It is not a living thing so does not have genetic material. However, it has a defined boundary in it.
What is the name of this molecule?
O A. Butane
O B. Propane
O C. Propene
O D. Butene
Answers
The molecule represented below is Butane.
Important things to know about Butane Butane is an organic compound consisting of 4 carbon atoms. it is also a straight chain alkane with unsaturated bonds.its molecular formulae is C4H10.Can be used as a refrigerant.looking at the structure give each point represents a carbon atom, placing a C on each point gives you a total of 4, making it to be butane.See picture attached for a vivid illustration of butane.
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Answer:
Butane
Explanation:
i just took tha test
Rain exist in which phase
Answers
Answer:
WATER!!!!!
Explanation:
hope it helps
How many total moles of ions are released when a solution of 6. 88 x 10-3 g nibr2•3h2o dissolves in water? do not list units and write value with exponents as ex: 1. 50e-7 (the key here is ions!)
Answers
The total mole of ion is 13. 76 mol
moles = number of moles per solute / volume of liters
Hence the total mole of the ion is 13.74 mol
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The total mol per ions are 7.57 X 10-5 mol of ions.
Each mole of NiBr2.3H2O forms 1 mole of Ni2+ ions and 2 moles of Br- ions, or a total of 3 mol of ions.
What is mol per ions ?
Number of mol is calculated by the ratio of given mass to the molar mass. Number of mol of sodium = given mass molar mass. The number of ions will be equal to the sum of the number of moles and Avogadro's number after the number of moles has been determined.
(Number of moles) X = Number of Ions (NA),
where NA= Avogadro's number.
Thus,
( 6.88 * 10-3g NiBr2.3H2O )( 1 mol NiBr2.3H2O272.55g NiBr2.3H2O )( 3 mol ions1 mol NiBr2.3H2O )
= 7.57 * 10-5 mol of ions.
Hence, The total mol per ions are 7.57 * 10-5 mol of ions.
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The periodic table is arranged by various patterns. Is there a pattern with regard to ionic charge? In three to five sentences, explain your reasoning and provide specific examples
Answers
Yes, there is a pattern about the ionic charge because the left-side elements in the periodic table have cation ions whereas the right-side elements have anions.
What is the pattern of ionic charge in the periodic table?Ions are formed because of the addition of electrons or the removal of electrons from an atom or molecules or other ions. Across a period, a nuclear charge of an atom increases while the electron shielding remains constant. A higher effective nuclear charge leads to greater attraction of the electrons which results in a smaller atomic radius of an atom. On the right side of the periodic table, elements accept electrons and become negative ions i.e. anions whereas elements on the left side lose an electron and become positive ions i.e. cations.
So we can conclude that due to the losing of the electron the left side of elements in the periodic table has a cation ion whereas the right side of elements has an anion because of the addition of electrons.
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Question 1 (Multiple Choice Worth 3 points)
(01.02 LC)
Complete this sentence. If the force of gravity___, the weight of an object will____
O decreases, increase
O Increases, increase
O increases, stay the same
O decreases, stay the same
the weight of an object will
Answers
Answer:
The answer to your question would be: B. Increase. Increase
the solution
. Which of the following trioxonitrate (v) will decomposes to its corresponding metal?
A. AgNO3 B. Zn(NO3)2 C. Pb(NO3)2 D. Cu(NO3)2
Answers
Answer:
A. AgNO3
I hope it's helps