Answers
Answer:
c,a,b,d
Explanation:
Related Questions
What is the vapor pressure of ethanoic acid at 105°C?
Answers
Which equation expresses the solubility product of Zn3(PO4)2?
a. Ksp = [Zn2+][PO43]
b. Ksp = [Zn2+]3 [PO43]2
c. Ksp = 6[Zn2+][PO43]2
d. Ksp = 108[Zn2+][PO43]2
Answers
⇒b. Ksp = [Zn2+]3 [PO43]2
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2.
Which mixture could be a useful buffer in a solution?
acetic acid (CH3CO2H) and hydrochloric acid (HCl)
sodium hydroxide (NaOH) and elemental sodium (Na)
ammonia (NH3) and ammonium chloride (NH4Cl)
acetic acid (CH3CO2H) and ammonia (NH3)
Pls answer quickly
Answers
Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C
A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.
In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.
Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.
Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.
Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).
The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.
Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.
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Why is important to only change one variable in a controlled experiment
Answers
A variable within a scientific experiment is something that is changed (i.e. it varies). There should be only one manipulated variable within a scientific experiment so that the experimenter can be certain it is this variable which causes a pattern in the resultant data, if any exists at all.
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Help please :) I don’t understand
Answers
Answer:
#3
Explanation:
Which of these is not a cycle studied by scientists?
O carbon
o hydrogen
O
rock
O
water
Answers
Answer:
Rock
Explanation:
There is a carbon cycle that scientists have studied that shows how carbon is reused in an ecosystem so carbon is not the answer.
There is a hydrogen cycle that scientists have studied that shows how hydrogen is exchanged between biotic and abiotic sources.
There is no rock cycle
There is a water cycle that has been studied by scientists that shows the movement of water within the earth and the atmosphere
The answer is Rock
As a rollercoaster travels upward what type of energy transfer is taking place?A.electrical to thermal energy B.kinetic to potential energy C.mechanical to chemical energy D.potential to kinetic energy
Answers
Answer:
B.
Explanation:
Vinegar, a common household item, is used in cleaning, cooking, baking and meat preservation. Vinegar contains acetic acid, hc2h3o2 which gives vinegar its' sour taste and pungent smell. What is the percent composition of carbon in acetic acid?.
Answers
The percent composition of carbon in vinegar is 40.04%. This is because acetic acid is a molecule composed of four atoms 4 H, 2 C and 2 O atoms, with the molecular formula of acetic acid is \(CH3COOH\).
To calculate the percent composition of carbon in acetic acid, we must first determine the mass of each element in the molecule. The atomic mass of carbon is 12.011, the atomic mass of hydrogen is 1.008, and the atomic mass of oxygen is 15.999. When multiplied by their respective subscripts, we get the relative molecular mass of acetic acid as 60.046. Now that we know the relative molecular mass of acetic acid, we can calculate the percent composition of carbon by dividing the mass of carbon in the molecule (12.011) by the total molecular mass (60.046). This gives us 0.4004, which can be expressed as a percentage by multiplying it by 100 giving us 40.04%.
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A compound is found to contain 31.42 % sulfur , 31.35 % oxygen , and 37.23 % fluorine by mass. What is the empirical formula?
Answers
The empirical formula for the compound containing 31.42% sulfur, 31.35% oxygen, and 37.23% fluorine is SO₂F₂
How do I determine the empirical formula?We'll begin by listing out the given parameters from the question. This given below:
Sulphur (S) = 31.42% Oxygen (O) = 31.35%Fluorine (F) = 37.23%Empirical formula =?The empirical formula for the compound can be obtained as follow:
Divide by their molar mass
S = 31.42 / 32 = 0.982
O = 31.35 / 16 = 1.959
F = 37.23 / 19 = 1.959
Divide by the smallest
S = 0.982 / 0.982 = 1
O = 1.959 / 0.982 = 2
F = 1.959 / 0.982 = 2
Thus, we can conclude the empirical formula for the compound is SO₂F₂
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How many atoms are there in 24 moles of Fe?
Answers
Answer: There are \(145 \times 10^{23}\) atoms in 24 moles of Fe.
Explanation:
According to the mole concept, 1 mole of a substance contains \(6.022 \times 10^{23}\) atoms.
Therefore, atoms present in 24 moles of Fe are calculated as follows.
\(24 mol \times 6.022 \times 10^{23} atoms/mol\\= 144.52 \times 10^{23} atoms\\or, 145 \times 10^{23} atoms\)
Thus, we can conclude that there are \(145 \times 10^{23}\) atoms in 24 moles of Fe.
how many moles of water are used to make 1.80 moles of sulfur dioxide
Answers
From the mole ratio of the reaction, the moles of water required is 3.6 moles.
What is the mole ratio of the reaction?The mole ratio of the reaction is the ratio in which the reactants combine to form products and is obtained from the equation of the reaction.
The equation of the reaction of the formation of sulfur dioxide is given below:
Equation of reaction: SF₄ + 2 H₂O → SO₂ + 4 HF
2 moles of water produce one mole of sulfur dioxide
Moles of water required to produce 1.8 moles of sulfur dioxide will be:
Moles of water required = 1.8 * 2/1
moles of water required = 3.6 moles of water.
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For the formula C4H9Cl , calculate the index of hydrogen deficiency (IHD) and select all the types of unsaturation that might be present in the molecule based on the IHD.
Answers
Answer:
IHD = 0; no unsaturation in the formula
Explanation:
The IHD is also known as the degree of unsaturation formula. This formula is commonly used to get an idea of how many unsaturations a molecule has, and in this way, we can get an approach of the type of compound we are treating. For example, if this number is 1, it means that the compound has at least one unsaturation and it could be a double bond or just cyclical compound.
The IHD is calculated using the following expression:
IHD = (a + 1) - (b + x - c)/2 (1)
Where:
a: number of carbon
b: number of hydrogens
c: humber of nitrogens
x: number of halogens.
Now, we have the formula C₄H₉Cl, let's identify a, b, c and x:
a: 4 carbons; b = 9 hydrogens; C = none; X: 1 chlorine
Replacing in (1) we have:
IHD = (4+1) - (9+1)/2
IHD = 5 - (10/2)
IHD = 0So this number is 0, which means that the molecule does not have any kind of unsaturation (Non double bond, multi bond or cyclical).
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A. What is the frequency of light that has a wavelength of 6.2 x 10^-7 m?
B. Identify the color of this light.
C. Calculate the amount of energy given off by this atom.
Answers
Answer:
I think the answer is letter C
what does wave do?
a. Waves transfer matter from one place to another place.
b. Waves transfer energy
c. Waves create energy
d. Waves are all the same.
Answers
Answer:
b
Explanation:
wave transfers energy from one place to another
PLEASE HELP, IS MY ANSWER CORRECT?
How does the ground temperature in sunlight with CO2 compare with the ground temperature in sunlight without CO2 (part A)? is my answer correct?
Based on the thermometer provided, it is clearly visible that when the simulation is without CO2, the temperature goes higher, however, not as quickly as when CO2 IS present.
Answers
Based on the thermometer provided, the ground temperature in sunlight with CO2 rises more rapidly and reaches a higher temperature compared to the ground temperature in sunlight without CO2.
Which of the following best defines average speed?
It is the speed of an object in a specific direction.
It is an object's speed at a specific point in time.
It is the total distance traveled over the total time.
It is a measure of how far an object moves in a certain time.
Answers
Answer:
It is the total distance traveled over the total time .
Answer:
D
Explanation:
2
3 of 6 - SCH4U
Date: Name(s):
4. HCl is a corrosive colourless gas that dissolves readily in water.
Aqueous HCl reacts with NaOH to form water and NaCl. In a simple
calorimeter, a 100.00 mL sample of 0.415 mol/L HCl(aq) is mixed
with 50.00 mL of excess NaOH(aq). During the reaction, there is a
rise in temperature by 4.83 °C. Calculate the molar enthalpy change
(in kJ/mol) for the above reaction. SHOW ALL YOUR WORK.
Answers
Answer: The molar enthalpy change is 73.04 kJ/mol
Explanation:
\(HCl+NaOH\rightarrow NaCl+H_2O\)
moles of HCl= \(molarity\times {\text {vol in L}}=0.415mol/L\times 0.1=0.0415mol\)
As NaOH is in excess 0.0415 moles of HCl reacts with 0.0415 moles of NaOH.
volume of water = 100.0 ml + 50.0 ml = 150.0 ml
density of water = 1.0 g/ml
mass of water = \(volume \times density=150.0ml\times 1.0g/ml=150.0g\)
\(q=m\times c\times \Delta T\)
q = heat released
m = mass = 150.0 g
c = specific heat = \(4.184J/g^0C\)
\(\Delta T\) = change in temperature = \(4.83^0C\)
\(q=150.0\times 4.184\times 4.83\)
\(q=3031.3J\)
Thus 0.0415 mol of HCl produces heat = 3031.3 J
1 mol of HCL produces heat = \(\frac{3031.3}{0.0415}\times 1=73043.3J=73.04kJ\)
Thus molar enthalpy change is 73.04 kJ/mol
I need help with the true or false
Answers
Answer:
1. True
2. True
3.True
4. False
5. True
6. False
7.True
Explanation:
Balance the following half eqn. in alkaline medium. Mno-4___ Mno2
Answers
MnO4- + 4e- → MnO2 + 2H2O Now the half-equation is balanced in alkaline medium.
To balance the half-equation MnO4- → MnO2 in alkaline medium, we need to follow the steps for balancing redox reactions in basic solution. The goal is to balance the number of atoms and charges on both sides of the equation.
Start by balancing the atoms other than oxygen and hydrogen. In this case, we only have manganese (Mn) atoms. There is one Mn atom on both sides, so the Mn atoms are already balanced.
Balance the oxygen atoms by adding water (H2O) molecules to the side that lacks oxygen. Since there are four oxygen atoms on the left side (MnO4-) and only two on the right side (MnO2), we need to add two water molecules to the right side:
MnO4- → MnO2 + 2H2O
Next, balance the hydrogen atoms by adding hydrogen ions (H+) to the side that lacks hydrogen. In this case, the left side (MnO4-) already has sufficient hydrogen atoms, so no hydrogen ions need to be added.
Balance the charges by adding electrons (e-) to the side that has a higher charge. MnO4- has a charge of -1, while MnO2 has no charge. Since the left side has a higher charge, we need to add electrons to the right side:
MnO4- + 4e- → MnO2 + 2H2O
Now the half-equation is balanced in alkaline medium. The Mn atoms, oxygen atoms, hydrogen atoms, and charges are all balanced. The addition of water and hydrogen ions helps balance the oxygen and hydrogen atoms, while the addition of electrons balances the charges.
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The digestive tract converts food into materials and energy. True False
Answers
Answer:
true
Explanation:
The digestive tract is made up of organs that food and liquids travel through when they are swallowed, digested, absorbed, and leave the body as feces. These include the mouth, pharynx (throat), esophagus, stomach, small intestine, large intestine, rectum, and anus.
When a strong acid or base is added to water it...
Answers
When a strong acid or base is added to water, the pH will change dramatically.
Strong AcidA strong acid is one that is completely dissociated or ionized in an aqueous solution. This means it gives off the greatest number of hydrogen ions or protons when placed in a solution. Examples of strong acid are HCl, HBr, H2SO4, HNO4. These acids when placed in water, produces greatest amount of hydrogen ions. The pH value changes drastically. Any that has very high concentration of hydrogen and ion is acidic.
Also when base is added to water, the pH of water will increase above 7 and become basic. The pH of water is 7, but when base is added to it increases above 7.
Base is any solution that is slippery to touch in water solution, changes color, react with acid to form salt and change red litmus paper to blue.
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Phương trình hóa học là gì
Answers
Explanation:
sự xuất bản hóa học nào? có một câu hỏi về khoa học mà bạn cần giúp đỡ? tôi luôn ở đây để giúp đỡ!
an atom has a mass number of 55. its number of neutrons is the sum of its atomic number and five. how many protons, neutrons, and electrons does this atom have? what is the idetity of this atom
Answers
Atom consists of electron, proton and neutron. The number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.
Mass number =Number of neutrons+ number of protons
Mass number =55
Number of neutrons=atomic number+5
Substituting the given values in the above formula
55 =atomic number+5+ number of protons
50=2×atomic number
Atomic number=25
Therefore, the number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.
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Oxygen decays to form nitrogen. 15 8 O → 15 7 N + 0 1 e This type of nuclear decay is called
Answers
The type of nuclear decay in which Oxygen decays to form nitrogen is beta plus decay.
What is a beta plus decay?A beta plus decay is a type of decay in which a proton in an element disintegrates to produce a neutron resulting in a decrease in the atomic number of the radioactive element.
In the given equation below:
\(^{15}_{7}O \rightarrow ^{15}_{7}N + ^{0}_{1}e\)Oxygen decays to form nitrogen due to a decrease in atomic number.
This is an example of beta plus decay.
In conclusion, oxygen decays to form nitrogen beta plus decay.
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how do one get this solution
-log10 (2* 10^-2)
Answers
The result of the computation when you follow the steps is 1.699.
A logarithm is a mathematical function that represents the exponent or power to which a specific base must be raised to obtain a given number. In simpler terms, it answers the question: "To what power must we raise a base number to obtain a certain value?"
What you should do is that on your calculator, you could press the logarithm key and then put in the value that has been shown and then the result would be displayed on your calculator.
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PLEASE HELP!!
ATTACHMENT BELOW
Answers
Answer:
read the story
Explanation:
read it and then you will find the answer
how many grams are there in 3400 moles of tetranitrogen dicarbide?
Answers
Explanation:
molar mass of tetranitrogen dicarbide S4N4= 4×32+4×14
128+56
184 g/mol
no.of moles =given mass/ molar mass
3400= given mass / 184
3400×184 =given mass.
625600 g
which type of blood vessel has a pulse
Answers
Answer:
The arteries should be your answer!
Explanation:
Copper-64 is used in the form of copper acetate to study brain tumors. It has a half-life of 12.8 hours. If you begin with 15.0 mg of 64 Cu-labelled copper acetate, what mass in mg remains after 2 days and 16 hours?
Answers
Answer:
0.58 milligrams
Explanation:
If this isnt correct than I appologize.
Just half of the power of tt makes up 60 hours. Then it is divided by t half knowing that there is 12.8 hours left. Then if you calculate it we get 0.58 mg and so after the 2 days and 16 hours we get our answer.
what is the oxidation number of nitrogen in the nitrate ion NO3^1-
Answers
Answer:
+5
Explanation:
You use the rules for oxidation numbers to calculate that the oxidation number of N is +5.