A burette reading is recorded as 27.70 cm3 +/- 0.05 cm3. Which of the following could be the actual value?
I 27.68 II 27.78
III 27.4
A I and II B I and III C II and III D I, II, III
Answers
When the burette reading is recorded as 27.70 cm3 +/- 0.05 cm3, the actual value could be I: 27.68 and II: 27.78.
The term "burette reading" refers to the volume of the burette at a certain point. It is most commonly used in chemistry labs. Burettes are used in titration experiments to precisely dispense a solution of known concentration until the equivalence point is reached.
Titration is the process of determining the concentration of a solution by measuring the volume of a standard solution needed to react with a precisely measured amount of the test solution.
The actual value of the burette reading is the average of the values given as the upper and lower limits of uncertainty. In this case, the upper limit is 27.75 cm3, and the lower limit is 27.65 cm3. As a result, the actual value could be either 27.68 cm3 (lower limit) or 27.78 cm3 (upper limit).
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Related Questions
The mass of one methane molecule is 2.7\times 10^(-23) gram. Find the mass of 60,000 molecules of methane. Express the answer in scientific notation.
Answers
The mass of one methane molecule is 2.7\times 10^(-23) gram. Then the mass of 60,000 methane molecules is 1.62 × 10⁻¹⁹ grams.
Given that the mass of one methane molecule is 2.7 × 10⁻²³ grams, we can calculate the mass of 60,000 methane molecules by multiplying the mass of one molecule by the number of molecules.
Mass of 60,000 methane molecules = (2.7 × 10⁻²³ grams/molecule) × (60,000 molecules)
To multiply these values, we can multiply the coefficients (2.7 and 60,000) and add the exponents of 10.
2.7 × 60,000 = 162,000
Since the exponent of 10 in the mass of one molecule is -23 and we are multiplying by 60,000, the exponent of 10 will be -23 + 5 = -18 (moving the decimal point 5 places to the right).
Therefore, the mass of 60,000 methane molecules is 1.62 × 10⁻¹⁹ grams.
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Which energy transformation occurs after a skydiver reaches terminal velocity?
O Gravitational potential energy transforms into thermal energy.
O Gravitational potential energy transforms into kinetic energy.
O Kinetic energy transforms into thermal energy.
O Kinetic energy transforms into gravitational potential energy.
Answers
Answer::
*Gravitational potential energy transforms into thermal energy.*
O Gravitational potential energy transforms into kinetic energy.
O Gravitational potential energy transforms into thermal energy.
When a skydiver jumps out of a plane, the following energy transfers take place: the skydiver's gravitational potential energy decreases as his altitude decreases and his kinetic energy store increases as his speed increases.When a skydiver jumps out of a plane, the following energy transfers take place: the skydiver's kinetic energy store increases as their speed increases. the thermal store of the air and the skydiver increases, as there is friction between the skydiver and the air particles.In this case, both options A and B are correct.
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The electrons between atoms in metallic bonds
allow for bonding metals to be reactive.
allow for bonding metals to be stable.
are stationary and provide durability to the metal.
are attracted to the neutrons of the metal.
Answers
Answer:
Metallic bonding is the type of chemical bonding that occurs between atoms of metals. In a metallic bond, atoms share their electrons in a way that allows them to form a “sea” of free electrons. This electron sea is responsible for the unique physical and electrical properties of metals.
Explanation:
Answer:
B. allow for bonding metals to be stable.
Explanation:
edge 2022
What mass of the calcium carbonate, to the nearest hundredth of a gram, is decomposed in this reaction.
Answers
Answer:
28.00 g is the answer
Answer:200
Explanation:
It’s is the answer
Just E and F please.
Equation: C3H6O3 + 3O2 --> 3CO2 + 3H2O
Answers
E. The moles of oxygen gas remaining in the firing bomb after the combustion reaction is complete is 2.633 mol O2.
F. The mass of water in the entire container after the combustion reaction is complete is 10.4 kg
How did we get the values?To calculate the moles of oxygen gas remaining in the firing bomb after the combustion reaction is complete, we first need to calculate the amount of oxygen gas consumed during the reaction. The balanced chemical equation for the combustion of lactic acid (s) is:
C3H6O3(s) + 4 O2(g) → 3 CO2(g) + 3 H2O(l)
From the balanced equation, we can see that each mole of lactic acid reacts with 4 moles of oxygen gas. Therefore, the number of moles of oxygen gas required for the combustion of 120.0 g of lactic acid is:
n(O2) = (4 mol O2/1 mol C3H6O3) x (120.0 g C3H6O3/90.08 g/mol C3H6O3) = 1.597 mol O2
Since there were 4.23 moles of oxygen gas initially present, the number of moles of oxygen gas remaining after the reaction is:
n(O2 remaining) = 4.23 mol O2 - 1.597 mol O2 = 2.633 mol O2
Therefore, the moles of oxygen gas remaining in the firing bomb after the combustion reaction is complete is 2.633 mol O2.
F. To calculate the mass of water in the entire container after the combustion reaction is complete, we need to consider the water in the calorimeter water jacket as well as the water produced by the combustion of lactic acid. The heat released by the combustion of lactic acid is absorbed by the water in the calorimeter, raising its temperature. The amount of heat absorbed by the water can be calculated using the following equation:
q = C × ΔT
where q is the heat absorbed (in joules), C is the heat capacity of the water (in J/(g·K)), and ΔT is the change in temperature (in K).
The heat absorbed by the water is equal to the heat released by the combustion of lactic acid, which can be calculated using the heat of combustion per gram of lactic acid:
ΔHc = -1364 kJ/mol (given)
The heat released by the combustion of 120.0 g of lactic acid is:
q = (ΔHc/mol) × (120.0 g/90.08 g/mol) = -1814 kJ
Note that the negative sign indicates that heat is being released by the system (the combustion of lactic acid).
Since all of the heat released by the combustion is absorbed by the water, we can equate the heat absorbed by the water to the heat released by the combustion:
Cwater × mwater × ΔT = -1814 kJ
where Cwater is the heat capacity of water, mwater is the mass of water in the calorimeter, and ΔT is the change in temperature of the water.
We know that the initial temperature of the water in the calorimeter is 15.0 °C and the peak temperature reached after the combustion reaction is 56.5 °C. Therefore, the change in temperature of the water is:
ΔT = 56.5 °C - 15.0 °C = 41.5 °C = 41.5 K
The heat capacity of water is 4.18 J/(g·K), so we can solve for the mass of water in the calorimeter:
mwater = -1814 kJ / (4.18 J/(g·K) × 41.5 K) = 10.4 kg
Therefore, the mass of water in the entire container after the combustion reaction is complete is 10.4 kg
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27.5 cm³ of a solution of NaOH neutralizes 25.0cm³ of 0.5 MHCL solution. Calculate the
concentration of NaOH in
b. gdm
a. Moldm-3
Answers
a)The concentration of NaOH in g/dm³ is approximately 18.18 g/dm³, and b)The concentration in mol/dm³ is approximately 0.4545 mol/dm³.
a)To calculate the concentration of NaOH in g/dm³ (grams per cubic decimeter) and mol/dm³ (moles per cubic decimeter), we need to know the amount of NaOH used in the reaction and the volume of the NaOH solution.
From the given information, we have:
Volume of NaOH solution = 27.5 cm³
Volume of HCl solution = 25.0 cm³
Molarity of HCl solution = 0.5 M
Since the reaction between NaOH and HCl is a 1:1 stoichiometric ratio, the moles of NaOH used can be determined from the moles of HCl used:
Moles of HCl = Molarity × Volume = 0.5 M × 25.0 cm³ = 12.5 mmol (millimoles)
Since the moles of NaOH used is also equal to the moles of HCl, we have:
Moles of NaOH = 12.5 mmol
b)To calculate the concentration of NaOH in g/dm³, we need to convert moles to grams using the molar mass of NaOH, which is approximately 40 g/mol:
Mass of NaOH = Moles × Molar mass = 12.5 mmol × 40 g/mol = 500 g
Now, we can calculate the concentration in g/dm³:
Concentration of NaOH (g/dm³) = Mass of NaOH / Volume of NaOH solution
= 500 g / 27.5 cm³
≈ 18.18 g/dm³
To calculate the concentration of NaOH in mol/dm³, we can use the same approach:
Concentration of NaOH (mol/dm³) = Moles of NaOH / Volume of NaOH solution
= 12.5 mmol / 27.5 cm³
≈ 0.4545 mol/dm³
Therefore, the concentration of NaOH in g/dm³ is approximately 18.18 g/dm³, and the concentration in mol/dm³ is approximately 0.4545 mol/dm³.
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Every spring has an equilibrium position. Which statements describe a spring at its equilibrium position ? Check all that apply.
The spring constant is zero.
The elastic potential energy is at a maximum.
The elastic potential energy is zero
The displacement of the spring is at a maximum.
The net force acting on the spring is zero.
Answers
Answer:
The elastic potential energy is zero.
The net force acting on the spring is zero.
The statements correct about the equilibrium position of Spring has been that the elastic potential energy and the net force acting on the spring has been zero at the equilibrium position. Thus statements C and E are correct.
The spring displacement can be described by Hooke's law. According to Hooke's law, the force required for the stretching and compression of the spring has been dependent on the spring stretch, and the spring constant.
The spring constant has been a non-zero quantity. Thus statement A is incorrect.The elastic potential energy of the spring has been the energy stored in the spring. At the equilibrium position, the elastic potential energy of the spring has been zero, as there has been the total kinetic energy.Thus statement B is incorrect, and C is correct.
The displacement of the spring at equilibrium position has been zero. Thus statement D is incorrect.The net force acting on the spring has been zero at the equilibrium position. Thus statement E is correct.For more information about the spring equilibrium position, refer to the link:
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What is the frequency of electromagnetic radiation having a wavelength of 3.33
x 10-8 m? What type of electromagnetic
radiation is this?
Answers
9× 10^15 Hz and this frequency belongs to the Ultraviolet rays having a wavelength of 3.33x10-8 m
Velocity= frequency× wavelength
frequency= Velocity/ wavelength
frequency= 3*10^8/ 3.33 * 10^-8
frequency= 0.9* 10^16
frequency= 9* 10^15 Hz
Frequency in physics refers to both the number of cycles or vibrations that a body in periodic motion experiences in a unit of time as well as the number of waves that pass in a unit time. When a body in periodic motion moves through a series of events or positions and then returns to its initial state, it is said to have completed one cycle or one vibration. The frequency is the reciprocal of the period, or time interval; in other words, frequency = 1/period = 1. (time interval).
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Match the term to its definition.Nonpolar2Composed of two atomsMetallic?A bond with a negativeend and a positive endPolar?A bond in which neitheratom takes more than itsshare of electronsElectronegativity?A type of bond that allowsvalence electrons to movefreely among ionsDiatomic?Determines what type ofbond will form
Answers
Non polar: A bon in which neither atom takes more than its share of electrons
Metallic : A type of bond that allows valence electrons to move freely among its ions
Polar: A bond with a negative end and a positive end
Electronegativity: Determines what type of bond will form
Diatomic: Composed of two atoms
What happens if you block calcium influx into the axon terminal?
Answers
Blocking calcium influx into the axon terminal can have several effects on neuronal communication and neurotransmitter release.
Calcium influx into the axon terminal is a key step in the process of neurotransmitter release. When an action potential reaches the axon terminal, it triggers the opening of voltage-gated calcium channels, allowing calcium ions to flow into the terminal. The increase in intracellular calcium concentration triggers the fusion of synaptic vesicles containing neurotransmitters with the presynaptic membrane, and the subsequent release of the neurotransmitters into the synaptic cleft.
If calcium influx into the axon terminal is blocked, neurotransmitter release is inhibited or reduced. This can lead to a variety of effects, depending on the specific neurotransmitter and the location of the synapse. For example:
- Inhibition of excitatory neurotransmitter release could reduce synaptic transmission and decrease neuronal activity.
- Inhibition of inhibitory neurotransmitter release could increase synaptic transmission and increase neuronal activity.
- Inhibition of neurotransmitter release at neuromuscular junctions could lead to muscle weakness or paralysis.
Calcium channel blockers are a class of drugs that can be used to block calcium influx into axon terminals and reduce neurotransmitter release. These drugs are used to treat a variety of conditions, including high blood pressure, angina, and arrhythmias.
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1.) The property by the virtue of which the metals can be beaten into sheets.
2) Observe the even set up and answer the questions that follow
PLEASE HELP ME
Answers
Answer:
1.) The property by the virtue of which the metals can be beaten into sheets.
Malleability
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find the percent by volume concentration for 50.00 ml of a 50% nacl solution added to more solvent to make 120.00ml of solutions
Answers
To find the percent by volume concentration for 50.00 ml of a 50% NaCl solution added to more solvent to make 120.00ml of solution, we need to use the following equation:
Volume (V) = Concentration (C) x Amount (A)
We know the amount (A) of NaCl is 50.00 ml, and we know the concentration (C) is 50%. Therefore, we can rearrange the equation to solve for V:
V = 50% x 50.00 ml
V = 25.00 ml
We also know that the total volume of the solution is 120.00 ml, so we can subtract 25.00 ml from 120.00 ml to get the volume of the solvent.
120.00 ml - 25.00 ml = 95.00 ml of solvent
To calculate the percent by volume concentration, we need to divide the volume of NaCl (25.00 ml) by the total volume (120.00 ml) and multiply by 100%.
25.00 ml/120.00 ml x 100% = 20.83%
Therefore, the percent by volume concentration of 50.00 ml of a 50% NaCl solution added to more solvent to make 120.00ml of solution is 20.83%.
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1. What is the molarity of an HCl solution if 50.0 mL of it is neutralized in a titration by
40.0 mL of 0.400 M NaOH? (0.32)
Answers
Answer:
C1 * V1 = C2 * V2
Explanation:
Where ‘C’ and ‘V’ refer to concentration and volume, ‘1’ and ‘2’ to solution 1 and 2 respectively. So, if ‘1’ refers to the HCl solution, we want to solve this equation for C1.
V1 = (C2*V2)/C1 = (0.4 * 50)/40 = 0.5 M
a glass vessel fitted with a stopcock has a mass of 337.428g when evacuated completely. when filled with ar, it has a mass of 339.854g. when evacuated and refilled with a mixture of ne and ar (under the same conditions of temp and pressure), it has a mass of 339.076g. calculate the mole fraction of ne in the mixture
Answers
a glass vessel fitted with a stopcock has a mass of 337.428g when evacuated completely. when filled with ar, it has a mass of 339.854g. when evacuated and refilled with a mixture of ne and ar. the mole fraction of ne in the mixture is 64,8%
You filled the first run with m = 339.854g - 337.428g = 2.426g of pure Argon. which is equivalent to N = m / M(Ar) = 2.426g / 39.948g/mol = 0.06073 mol. Assume the gas in the vessel behaves perfectly. The amount in the vessel is then given by: N = pV / (RT) and is independent of the type of gas. If you fill the vessel with the same mixture of N(Ne) moles of Neon and N(Ar) moles of Argon as in the first run, the total number of moles will be the same: N = 0.06073 mol N(Ne) + N(Ar) = N. The total mass of gas is calculated as: N(Ne) M(Ne) + N(Ar) M(Ar) = m', which is measured as: m' = 339.07g - 337.428g = 1.648g. Next, initiate the mole fraction of Neon x(Ne) = N(Ne)/N from the simple equation for the number of moles: N(Ar)/N = 1 - x(Ar) (Ne). Divide the mass equation by N to get: x(Ne) M(Ne) + (1-x(Ne)) M(Ar) = m'/N. As a result, the mole fraction of Neon is calculated as follows: x(Ne) = (M(Ar) - m'/N) = (M(Ar) - M(Ne)) = (39.948g/mol - 1.648g/0.0607mol) / (39.948g/mol - 20.1797g/mol) = 64,8%.
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Find grocery items in your home look and see the product label at the back of each item identify the elements or compounds on each item use the table below for this activity grocery time 123456789 10 elements compounds
Answers
The chemical elements and compounds that are present in a grocery item such as mayonnaise include:
OilEmulsifier Vinegar SpicesSugarWhat is a product label?A product label can be defined as a paper document which contains information about the nutrients, chemical elements, and other compounds that are present in a product such as a battery, food or an edible material.
This ultimately implies that, a product label is a paper document which is used by manufactures to specify the nutrients, chemical elements, and other compounds that were used to make a particular product.
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How many grams are in 160 lbs ?
Answers
Which quantity of particles is correctly represented 1 mol of H2?
Answers
Near the equator, the sun heats the surface strongly, causing warm air to rise steadily. This creates the _________________, an area of _________________pressure with very little wind.
Your answer:
horse lattitudes, high
horse latitudes, low
doldrums, high
doldrums, low
Answers
did scientists accept wegeners theory? why or why not?
Answers
Answer: No, scientist did not accept his theory of continental drift
Explanation:His theory wasn't accepted because he thought that the force of Earth's spin was sufficient to cause the continents to move, but geologist knew that rocks are too strong for this to happen. I hope this helps!
if the same amount of heat is added to 50.0 g samples of each of the metals, which are all at the same temperature, which metal will reach the highest temperature?
Answers
The metal which will reach the highest temperature is the metal with the lowest specific heat capacity.
What is the amount of heat added to each metal?The amount of heat Q = mcΔT where
m = mass of metalc = specific heat capacity of mateal and ΔT = temperature changeTemperature change of the metalMaking ΔT subject of the formula, we have
ΔT = Q/mc
Given that Q and m are the same for each metal,
ΔT ∝ 1/c
We see that the temperature change is inversely proportional to the specific heat capacity.
Since the metals are at the same temperature, the metal which will reach the highest temperature is the metal with the lowest specific heat capacity.
So, the metal which will reach the highest temperature is the metal with the lowest specific heat capacity.
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Energy from a reaction was determined to be 3870 J using a water calorimeter, when burning 9.00 grams of H2. What is the total enthalpy of the reaction?
Answers
Answer:
860 J / mol
Explanation:
Enthalpy = Energy / no. of moles
no. of moles = mass / molar mass
Take the atomic mass of H = 1.0,
molar mass of H2 = 1.0 x 2
= 2.0
no. of moles of H2 = 9.00/2
= 4.5 mol
Hence,
Enthalpy = 3870 / 4.5
=860 J / mol
Why should barbecues and cars never be operated in enclosed places?
Answers
Hi I really need help 7th grade science Water gets soaked up by a paper towel because of the property of blank Adhesion Cohesion Deposition Evaporation
Answers
Answer:
Adhesion
Explanation:
Water is soaked up by a paper towel because the forces of adhesion exceeds the forces of cohesion.
The forces of adhesion binds the water molecule to the paper towel while the forces of cohesion binds the water molecules to each other.
Adhesion of water to the walls of the paper exerts an upward force that draws water molecules up the paper.
Hence, the movement of water up a paper towel occurs when the forces of adhesion to the walls of the paper is greater than the forces of cohesion acting between the water molecules.
Iron has a density of 7. 86 g/cm3 (1 cm3=1 mL). Calculate the volume (in dL) of a piece of iron having a mass of 4. 18 kg. Note that the density is provided in different units of volume and mass than the desired units of volume (dL) and the given units of mass (kg). You will need to express the density in kg/dL (1 cm3 = 1 mL) before calculating the volume for the piece of iron
Answers
510.17 centimetres cube is the volume of iron has a density of 7.86 gram per centimetres cube ( 1 centimetre cube = 1ml) and has a mass of 4.01 kg.
Density is the amount of mass of a substance present per volume of the cubic centimetre and it is the ratio of mass of a substance to the volume of the substance with a unit centimetre cube.
The iron has a density of 7.86 gram per centimetres cube and mass of 4.01 kg so,
mass in grams= \(\frac{4.01}{1000} = 0.0041g.\\Density= \frac{mass}{volume}\)
Substituting the values in the equation, we get:-
volume= \(\frac{0.0041}{7.86} = 510.17 cm^{3} .\)
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why does salt water have more cohesion than tap water
Answers
Answer:
Cohesion exists because of the polarity of water. The water has a dipole that causes it to act like a magnet, attracting other water molecules to it. ... The salt water has a much lower cohesion than plain water so it's attractive forces are less than plain water.
What is the percentage by mass of sulphur in Al2(SO4)3[A12SO4 =
342g/mol, S = 32]
Answers
Answer: The percentage by mass of sulphur in \(Al_2(SO_4)_3\) is 9.36%
Explanation:
Mass percent of an element is the ratio of mass of that element by the total mass expressed in terms of percentage.
\({\text {Mass percentage}}=\frac{\text {mass of sulphur}}{\text {Total mass}}\times 100\%\)
Given: mass of sulphur = 32 g/mol
mass of \(Al_2(SO_4)_3\) = 342 g/mol
Putting in the values we get:
\({\text {Mass percentage}}=\frac{32g/mol}{342g/mol}\times 100\%=9.36\%\)
The percentage by mass of sulphur in \(Al_2(SO_4)_3\) is 9.36%
analysis of a sample of an ionic compound yields 2.82 g of na, 4.35 g of cl, and 7.83 g of o. find the empirical formula and enter in this order naclo (do not enter subscripts of 1) and give the name of the compound?
Answers
Answer:
The empirical formula is Na3Cl4O8
Explanation:
The empirical formula is the simplest whole number ration of an element
Based on your results,
which volumetric glassware did you most precisely to deliver 20 cm^3 of distilled water. Explain your answer
Answers
In general, the most precise volumetric glassware for delivering a specific volume of liquid is the volumetric pipette.
This is because volumetric pipettes are designed to deliver a specific, precise volume of liquid at a specific temperature, whereas other types of volumetric glassware such as graduated cylinders or burettes have greater variability in the volumes they deliver.
Additionally, volumetric pipettes have a smaller margin of error and are calibrated to a higher degree of accuracy compared to other types of volumetric glassware.
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Which of the following will require the least time for a reaction to reach equilibrium? O a. Cannot tell, since the time required to reach equilibrium does not depend on Kc. O b. Cannot tell without knowing the value of Kc- O c. Kc is a very large number. O d. Kc is a very small number. O e. Kc is approximately one.
Answers
The time required for a reaction to reach equilibrium can depend on the value of Kc, which represents the equilibrium constant. The equilibrium constant, Kc, is determined by the concentrations of the reactants and products at equilibrium.
In general, reactions with a larger Kc value tend to reach equilibrium more quickly than those with a smaller Kc value. This is because a larger Kc indicates that the concentration of products is higher compared to the concentration of reactants at equilibrium. As a result, the reaction proceeds more rapidly to reach the point where the ratio of products to reactants matches the value of Kc.
Therefore, among the given options, the answer would be option (c) where Kc is a very large number. In this case, the reaction would require the least amount of time to reach equilibrium.
It's important to note that the actual time required for a reaction to reach equilibrium depends on various factors such as temperature, pressure, and the presence of catalysts. Additionally, the time required for a reaction to reach equilibrium cannot be determined solely based on the value of Kc. However, in general, a larger Kc value suggests a quicker attainment of equilibrium.
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What is [Al(H2O)5(OH) 2+] in a 0. 15 M solution of Al(NO3)3 that contains enough of the strong acid HNO3 to bring [H3O +] to 0. 10 M?
Answers
Al(NO3)3 solution concentration and the concentration of H3O+ ions in the solution following the addition of HNO3 are given in the problem. We can determine the presence of [Al(H2O)5(OH)2+] in the solution using this knowledge along with the known equilibria for the hydrolysis of Al3+.
For Al3+, the hydrolysis process may be expressed as follows:
Al(H2O)63+ + water becomes Al(H2O)5(OH)2+ + H3O+.
The reaction's equilibrium constant expression is as follows:
Al(H2O)5(OH)2+) = K
Al(H2O)63+ / [H3O+]
We must take into account the dissociation of Al(NO3)3 in water in order to determine [Al(H2O)5(OH)2+] in a 0.15 M solution of Al(NO3)3:
Al3+ (aq) + 3NO3- Al(NO3)3 (s) (aq)
Al3+ has a concentration of 0.45 M (3 times that of the Al(NO3)3 solution) in an Al(NO3)3 solution with a concentration of 0.15 M. H3O+ is present in the solution at a concentration of 0.10 M.
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