A buret is filled with deionized (DI) water and the stopcock is used to adjust the meniscus of the water in the buret to an initial value of 2.87 mL. The stopcock is opened and the DI water is dispensed in a flask. The stopcock is closed and the final buret reading is 17.67 mL. The volume of DI water (mL) in the flask is
a) 35.20
b) 14.8
c) 14.80
d) 20.5
Answers
The volume of DI water in the flask is 14.80 mL, which corresponds to answer choice (c).
In this problem, we are given the initial and final readings of a buret filled with deionized (DI) water and asked to determine the volume of DI water dispensed into a flask. Using the difference between the final and initial buret readings, we can calculate the volume of DI water dispensed.
The volume of DI water dispensed into the flask can be calculated as follows:
Volume dispensed = Final buret reading - Initial buret reading
Volume dispensed = 17.67 mL - 2.87 mL
Volume dispensed = 14.80 mL
Therefore, the volume of DI water (mL) in the flask is 14.80 mL, which is option (c).
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Related Questions
Classify these descriptions as pertaining to nonspontaneous reaction in a cell only, a spontaneous reaction in a cell only, both, or neither.
Answers
On the basis of classification, electrolytic cells use non-spontaneous reactions which require an external power source in order to proceed.
On the other end, galvanic cells are spontaneous reaction, meaning it occurs with no outside intervention
What is a chemical change?A chemical change or reaction simply refers to a change which is not easily reversed and in which no new substance is formed.
So therefore, On the basis of classification, electrolytic cells use non-spontaneous reactions which require an external power source in order to proceed.
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Please help, A, B, C, or D?? Thank you very much if u help
Answers
The temperature on the axis of an H-R diagram is increasing from right to left. Hence, option D is correct.
What is H-R diagram ?One of the most crucial tools for studying star evolution is the HR diagram, often known as the Hertzsprung-Russell diagram (HR diagram). It was separately created by Ejnar Hertzsprung and Henry Norris Russell in the early 1900s and shows either the color of stars (or spectral type) against their absolute magnitude or the temperature of stars against their brightness.
Every star goes through several developmental stages that are determined by its internal structure and method of energy production depending on its starting mass.
The temperature and luminosity of the star fluctuate with each of these stages, and as the star develops, it may be seen moving to various locations on the HR diagram. This demonstrates the real power.
In this diagram, the temperature is decreasing from left to right and luminosity increases from bottom to top. Hence, option D is correct.
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without constants you would not know which variable affected the
Answers
What are the standard temperature and pressure conditions enthalpy is usually measured under?
A. 1 kPa and 273 K
B. 100 kPa and 298 K
OC. 298 kPa and 100 K
D. 1 kPa and 100 K
Reset Selection
Answers
The standard temperature and pressure conditions enthalpy is usually measured under are 1kPa and 273K (option A).
What is enthalpy?Enthalpy in thermodynamics is a measure of the heat content of a chemical or physical system.
Enthalpy is the sum of the internal energy and pressure times volume It can be calculated using the following formula:
H = E + P V
Where;
H = Enthalpy
E = internal energy
P = pressure
V = volume
However, the enthalpy of a substance is usually measured under standard temperature and pressure.
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How many electrons are present in an atom in which the first and second shells and the 3s subshell are filled?.
Answers
Explanation:
Any orbital can hold a maximum of 2 electrons with opposite spin. The first shell has one 1s orbital and holds 2 electrons. The second shell holds 8 electrons; 2 in a 2s orbital and 6 in three 2p orbitals. The third shell holds 18 electrons; 2 in a 3s orbital; 6 in three 3p orbitals; and 10 in five 3d orbitals.
In an atom which contains all the shells up to 3s filled, there will be 12 electrons.
According to the Aufbau principle, the s sub-shell can contain 2 electrons and the p sub-shell can contain 6 electrons.
The atom in which the shells up to 3s are filled, must have 1s, 2s, 2p and 3s orbitals filled.
Therefore, the total number of electrons present in the atom = number of electrons present in 1s + number of electrons in 2s + number of electrons in 2p + number of electrons in 3s.
Total number of electrons in the atom = 2 (electrons from 1s) + 2 (electrons from 2s) + 6 (electrons from 2p) + 2 (electrons from 3s).
Total number of electrons in the atom = 12
So, an atom which has all the shells up to 3s sub-shells filled contains 12 electrons.
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Calcium carbonate, CaCO3(s), decomposes upon heating to give CaO(s) and CO2(g). A sample of CaCO3 is decomposed, and carbon dioxide is collected in a 250 mL flask. After decomposition is complete, the gas has a pressure of 1.3 atm at a temperature of 31 degrees Celsius. How many moles of CO2 gas were generated?
Answers
The moles of CO₂ gas was generated at 0.01302 mol.
The Ideal Gas Law equation can be used for calculating the moles.
PV = nRT
n = PV/RT
Where:
P = pressure = 1.3 atm
V = volume = 250 mL = 0.25 L
n = number of moles of CO₂ gas
R = ideal gas constant = 0.0821 L·atm/mol·K
T = temperature in Kelvin = (31 + 273) K = 304 K
Substituting the values in the above equation.
n = (1.3 atm)(0.25 L) / (0.0821 L·atm/mol·K)(304 K)
n = 0.01302 mol CO₂ gas
Therefore, 0.0152 moles of CO₂ gas were generated.
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Which of the following would be considered a physical property?
Colour
Flammability
pH
Reactivity
Answers
Among the given properties, color is considered a physical property.
A physical property is a characteristic of a substance that can be observed or measured without changing the substance's identity. It helps in identifying and classifying substances. Some examples of physical properties include color, odor, density, melting point, boiling point, and conductivity.
Out of the given properties, color is considered a physical property. It is a visual characteristic that can be observed without altering the substance's chemical composition. For example, the color of an object can be described as red, blue, green, etc., without changing the object's identity.
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If the momentum of a car is reduced by half, assuming mass did not change, what must also have been reduced by half?
Answers
Answer:
Velocity is halved
Explanation:
Momentum is contingent on mass and velocity. The quantity of motion in a body is called the momentum of the body.
Momentum = mass x velocity
Now, if mass does not change and momentum is reduced by half, it suggests that the velocity was reduced by half.
Velocity is directly related to momentum.
What is the correct Lewis structure for Group 5A element, Arsenic?
.As. :AS
As
:
• As.
...
A.
B.
C.
D.
A.
A
B.
B
C.
с
D. D
Answers
Answer:
As
Explanation:
because of ionic bond
HELP true or false: if all the bonds in a molecule are polar the molecule is a polar molecule
Answers
The given statement is False.
Not all molecules having polar bonds are polar. An example is linear carbon dioxide molecule (CO 2). The individual C−O bonds are polar but the molecule on the whole is non polar as individual bond dipoles cancel each other. Another example is boron trifluoride (BF 3) molecule with triangular planar geometry. Another example is carbon tetrachloride (CCl4) with tetrahedral geometry.
3Li HPO
How many elements?
How many Atoms of Lithium (Li)?
How many Atoms of Hydrogen (H)?
How many Atoms of Phosphorus (P)?
How many Atoms of Oxygen (0)?
How many total Atoms in this Chemical Formula?
1 2 3 4 5
Answers
Answer:
1) There are Four Elements
Li , H , P , O
2) Li have 3 atoms.
3) H have 3 atoms.
4) P have 3 atoms.
5) O have 3 atoms.
HELP PLEASE
What does the 2 mean in the formula of calcium nitrate? What does the 3
mean?
Answers
Answer:
Calcium nitrate is an inorganic compound with the chemical formula Ca(NO3)2. ... It is a nitrate salt of Calcium which contains calcium and nitrogen and oxygen. Calcium nitrate is a white or whitish-grey coloured granular solid which absorbs moisture from the air and is usually found as a tetrahydrate compound Ca(NO3)2.
Explanation:
The electron configuration for Helium (He) is shown below.
1s2
Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?
Answers
Answer:
3rd image
Explanation:
Where is the Oort cloud located?
in the innermost region of the solar system, closest to the Sun
in the outermost region of the solar system, beyond Neptune
in the region between the Kuiper belt and the scattered disk
in the region beyond Neptune, but closer to the Sun than the Kuiper belt
Answers
Answer:
Option B - in the outermost region of the solar system, beyond Neptune.
Explanation:
The Oort Cloud is an extended shell of icy objects that exist in the outermost reaches of the solar system.
Answer:
b
Explanation:
i took the test
What type of elements does fission produce?
Answers
Answer:
Atomic bombs are made up of a fissile element, such as uranium, that is enriched in the isotope that can sustain a fission nuclear chain reaction. When a free neutron hits the nucleus of a fissile atom like uranium-235 (235U), the uranium splits into two smaller atoms called fission fragments, plus more neutrons. Fission can be self-sustaining because it produces more neutrons with the speed required to cause new fissions. This creates the chain reaction.
Explanation:
i hope this helps any?
Answer:
fissile bombs such as URIANIUM
Explanation:
Atomic bombs are made up of a fissile element, such as uranium, that is enriched in the isotope that can sustain a fission nuclear chain reaction. When a free neutron hits the nucleus of a fissile atom like uranium. The uranium splits into two smaller atoms called fission fragments, plus more neutrons.
define the acid rain for class 10 .???
Answers
Answer: Acid rain is caused by a chemical reaction that begins when compounds such as sulphur dioxide and oxides of nitrogen are released into the air. These substances can rise very high up into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants called acid rain.
Explanation:
What mass of sugar C12H22O11 is required to provide 2.50 x 1023 molecules of O2?
Answers
Using the reaction of Calcium Chloride and Sodium Phosphate, what would be the limiting reactant if 15mL of 0.2SOM Calcium Chloride was combined with 15mL of 0.325M Sodium Phosphate? Show your calculations. Include the Balanced Chemical Equation, with phases. 2). The solubility of Barium Hydroxide is listed in the solubility table as 5.60g of Barium Hydroxide Octahydrate at 15°C in 100mL of Water. Show your work for the following calculations. Give all values to three significant figures. How many moles of Barium Hydroxide is this? How many grams of Barium Hydroxide can dissolve in 100mL of water at 15°C? What is the molarity of Barium lons? What is the molarity of Hydroxide ions?
Answers
The limiting reactant is Calcium Chloride, and Barium Hydroxide's molarity is 0.11M with a solubility of 5.60g in 100mL of water at 15°C.
1. The limiting reactant in the reaction between Calcium Chloride and Sodium Phosphate would be Sodium Phosphate, as it has a lower number of moles.
The balanced chemical equation for the reaction is: \(CaCl_2\)(aq) + \(Na_3PO_4\)(aq) → \(Ca_3(PO_4)_2\)(s) + 6NaCl(aq).
The calculation for the limiting reactant can be shown as follows:
Moles of \(CaCl_2\) = (0.2 mol/L) x (0.015 L) = 0.003 mol
Moles of \(Na_3PO_4\) = (0.325 mol/L) x (0.015 L) = 0.004875 mol
Therefore, \(Na_3PO_4\) is the limiting reactant.
2. The molar mass of Barium Hydroxide Octahydrate is 315.46 g/mol.
Moles of Barium Hydroxide Octahydrate that can dissolve in 100mL of water at 15°C = (5.60 g) / (315.46 g/mol) = 0.0178 mol
Grams of Barium Hydroxide that can dissolve in 100mL of water at 15°C = 5.60 g
Molarity of Barium ions = (0.0178 mol) / (0.1 L) = 0.178 M
Molarity of Hydroxide ions = 2 x (0.0178 mol) / (0.1 L) = 0.356 M.
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Name three organelles and explain the function of each.
this is more science
giving 15 points
Answers
Conditions inside lysosomes have been shown to be acidic. These conditions are maintained by the lysosome membrane thus providing favorable conditions.
Specifically, ribosomes bind to messenger RNA, abbreviated mRNA. The ribosome reads a series of nucleotide bases in groups of three called codons.
Example The anticancer druge cir-platin hydrolysis in with constant 1. Solo - at pH 7:0 and 25°c. calculate the half life of the reaction
Answers
Answer:
ganda no beeeeeèeeeeee
Which of these is an example of a prosthesis?
A. A hearing aid
B. A textbook
C. Gloves
D. A pair of boots
Answers
Answer:
hearing aid
Explanation:
an artificial body part
A hearing aid is an example of a prosthesis. Therefore, option A is correct.
A prosthesis is an artificial device or replacement for a missing body part or function. In the case of a hearing aid, it is a device designed to assist people with hearing loss by amplifying sound. It acts as a substitute for the natural function of the ear.
A textbook is a written educational resource, gloves are protective coverings for the hands, and a pair of boots is footwear. These items do not serve as artificial replacements for missing body parts or functions.
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1. A newspaper article wrote about a study in which researchers subjected laboratory gloves to stress. Among 240 vinyl gloves, 63% leaked. Among 240 latex gloves, 7% leaked. Calculate the claim that vinyl gloves have a higher leak rate than latex gloves. Use 0.005 significance level.
Answers
The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.
To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.
The z-value is calculated as:
z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))
where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.
Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.
For vinyl gloves:
Sample size (n₁) = 240
Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)
For latex gloves:
Sample size (n₂) = 240
Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)
We will calculate the z-value using the formula:
z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))
where p₁ and p₂ are the sample proportions.
p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629
p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071
Calculating the z-value:
z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))
z ≈ 13.239
The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.
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1. 0 g of h_{2}o_{2} solution (30 wt%) was titrated with 22. 143 ml of kmno_{4} solution. What is the molarity of the kmno_{4} solution? Report your answer with three decimal places. Molar mass: H2O2 = 34. 01g/mol Reaction: 2MnO2 + 5H2O2 + 6H+ + 2Mn +2 +502 +8H2O Type your numeric answer and submit
Answers
The molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).
To calculate the molarity of the KMnO4 solution, we need to use the stoichiometry of the reaction and the volume of the KMnO4 solution used in the titration.
Given:
Mass of H2O2 solution = 1.0 g
Concentration of H2O2 solution = 30 wt% (weight percent)
Volume of KMnO4 solution used = 22.143 mL
Molar mass of H2O2 = 34.01 g/mol
Step 1: Calculate the moles of H2O2 in the solution.
Moles of H2O2 = (Mass of H2O2 solution) / (Molar mass of H2O2)
= 1.0 g / 34.01 g/mol
= 0.0294 mol
Step 2: Calculate the moles of KMnO4 based on the stoichiometry of the reaction.
According to the balanced equation, the ratio of KMnO4 to H2O2 is 2:5.
Therefore, moles of KMnO4 = (Moles of H2O2) * (2/5)
= 0.0294 mol * (2/5)
= 0.01176 mol
Step 3: Calculate the molarity of the KMnO4 solution.
Molarity (M) = (Moles of KMnO4) / (Volume of KMnO4 solution in liters)
= 0.01176 mol / 0.022143 L
= 0.5316 M
Therefore, the molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).
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What type of compound is this?
Answers
Answer:sorry id ont known
Explanation:give m brianlest if you want
For an atom of sulfur, there are?
1. two electron shells with 6 valence electrons
2. three electron shells with 6 valence electrons
3. four electron shells with 6 valence electrons
4. five electron shells with 6 valence electrons
Answers
Answer:
I think its b, but ik not completely sure.
Answer:
I think the second one...
BALANCING EQUATIONS 2
Explain in as much detail as possible what the following balanced equation tells you. You answer should include
information from the state symbols.
Answers
Answer:
ill give you a brief answer
normally when o2 is attached it is a combustion reaction so this reaction tells that p4 is burned in presence of air to form p4o10 which is the ash that remains
the balanced equation tells that 5 moles of o2 is rrquired to burn 1 mole of p4 to form 1 mole of p4o10
The given balanced equation is tells us about,
Since oxygen is present in the reaction. So it is combustion reaction. This reaction tells that \(P_{4}\) is burned in presence of air (\(O_{2}\)) because it is to form \(P_{4}O_{10}\) which is the ash. The balanced equation tells that 5 moles of \(O_{2}\) is required to burn 1 mole of \(P_{4}\) to form 1 mole of \(P_{4}O_{10}\).What is balanced chemical equation?The chemical equation in which number of atoms in reactant side is equal to number of atoms of product side is called balanced chemical equation.Example: \(P_{4}\) + \(5O_{2}\) → \(P_{4}O_{10}\).learn about balanced equation.
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what are the reactants in the following equation: hcl(aq) nahco₃(aq)→ co₂(g) h₂o(l) nacl(aq)
Answers
Hydrogen chloride (HCl) and sodium bicarbonate (NaHCO3) are the reactants. The substances produced as a result of this reaction are CO2(g), H2O(l), and NaCl(aq).
The reactants in the following equation:
HCl (a q) + NaHCO3(a q) → CO2(g) + H2O(l) + Na C l (aq) are hydrogen chloride (HC l) and sodium bicarbonate (NaHCO3).
Explanation:
A reactant is a substance that undergoes change during a chemical reaction. A reaction equation includes the symbols and formulas of reactants and products, along with the physical states of the substances, as they appear before and after the reaction.
The chemical reaction in this question is: HC l(a q) + NaHCO3(a q) → CO2(g) + H2O(l) + Na Cl (a q)In this equation, the reactants are H Cl (a q) and NaHCO3(a q), which are in an aqueous state.
Therefore, hydrogen chloride (H Cl) and sodium bicarbonate (NaHCO3) are the reactants. The substances produced as a result of this reaction are CO2(g), H2O(l), and Na Cl (a q).
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A student was assigned to take water samples from a lake his home . He measured the pH of one of the water samples to be 6.0 . Which of the following best describes this sample of water ?
-highly avid
-slightly acid
-highly basic
-slightly basic
Answers
Answer: I'm guessing but I think this is the answer and also what I put in mine sorry if wrong
Explanation: I think it's "B.- Slightly Acidic" srry if it's too late-
Given the following redox reaction:
4H3P + 3O2 → 6H2O + P4
Column A
1.
Which element is being oxidized?:
2.
Which element is being reduced?:
3.
Which element is the spectator ion?:
4.
Which compound is the oxidizing agent?:
5.
Which compound is the reducing agent?:
Column B
a.Hydrophosphoric acid
b.Hydrogen
c.Oxygen
d.Phosphorous
e.none
Answers
The element being oxidized is Phosphorus (P)
The element being reduced is Hydrogen (H)
There is no spectator ion in this reaction.
The oxidizing agent is Oxygen (O2)
The reducing agent is Phosphorus (H3P)
Transferring electrons from one species (the reducing agent) to another in a redox reaction, sometimes referred to as an oxidation-reduction process, is what happens (the oxidising agent).
Phosphorus (P) undergoes oxidation in the given reaction, going from an oxidation state of +3 to +5, while hydrogen (H) undergoes reduction, going from an oxidation state of +1 to 0.
As oxygen (O2) accepts electrons from phosphorus (P), oxidising it, oxygen (O2) is acting as the oxidising agent. As Oxygen (O2) receives electron donations from Phosphorus (H3P), which is serving as the reducing agent, it is reduced.
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Choose one postulate of Dalton's atomic theory and explain it in your own words.
Answers
One of the postulates of Dalton's atomic theory is that "All matter is made of atoms, which are indivisible and indestructible."
Everything in the universe is made up of small, indivisible particles called atoms. These atoms cannot be broken down into smaller pieces and they cannot be destroyed. This postulate is important because it helps us understand the basic building blocks of matter and how they behave.
Atoms can be combined in simple integer ratios to form compounds, and during a chemical reaction, atoms are rearranged but not created or destroyed. This postulate is known as the law of conservation of mass. Without atoms, there would be no matter and therefore no universe as we know it.
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