Answer:
Equalize the changes in oxidation number Each Zn atom has lost two electrons, and each H atom has gained one electron. You need 2 atoms of H for every 1 atom of Zn. This gives us total changes of +2 and -2.
Explanation:
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The density of lead is 11.4g/cm3. What volume, in ft3, would be occupied by 10.0 g of lead?
Answer:
3.10×10¯⁵ ft³.
Explanation:
The following data were obtained from the question:
Density (D) of lead = 11.4 g/cm³
Mass (m) of lead = 10 g
Volume (V) of lead =.?
Density (D) = mass (m) / Volume (V)
D = m/V
11.4 = 10 / V
Cross multiply
11.4 × V = 10
Divide both side by 11.4
V = 10 / 11.4
V = 0.877 cm³
Finally, we shall convert 0.877 cm³ to ft³. This can be obtained as follow:
1 cm³ = 3.531×10¯⁵ ft³
Therefore,
0.877 cm³ = 0.877 cm³ × 3.531×10¯⁵ ft³ /1 cm³
0.877 cm³ = 3.10×10¯⁵ ft³
Thus, 0.877 cm³ is equivalent to 3.10×10¯⁵ ft³.
Therefore, the volume of the lead in ft³ is 3.10×10¯⁵ ft³.
How much potassium chloride will dissolve in 25 grams of water at 80°C?
Please I need help
Answer:
The problem provides you with the solubility of potassium chloride,
KCl
, in water at
20
∘
C
, which is said to be equal to
34 g / 100 g H
2
O
.
This means that at
20
∘
C
, a saturated solution of potassium chloride will contain
34 g
of dissolved salt for every
100 g
of water.
As you know, a saturated solution is a solution that holds the maximum amount of dissolved salt. Adding more solid to a saturated solution will cause the solid to remain undissolved.
In your case, you can create a saturated solution of potassium chloride by dissolving
34 g
of salt in
100 g
of water at
20
∘
C
.
Now, your goal here is to figure out how much potassium chloride can be dissolved in
300 g
of water at this temperature. To do that, use the given solubility as a conversion factor to take you from grams of salt to grams of water
A 400-MHz instrument found a proton at 7.78 ppm. What is the chemical shift from TMS in hertz?
The chemical shift of the proton from TMS is 3.112 Hz.
What is a chemical shift?Generally, The chemical shift of a proton from TMS (tetramethylsilane) in Hz can be calculated as follows:
δ (in Hz) = δ (in ppm) x (frequency in MHz) / 10^6
Plugging in the values, we get:
δ (in Hz) = 7.78 ppm x (400 MHz) / 10^6 = 3.112 Hz
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For which of the following processes would S° be expected to be most positive? a) O2(g) + 2H2(g) 2H2O(g) b) H2O(l) H2O(s) c) NH3(g) + HCl(g) NH4Cl(g) d) 2NH4NO3(s) 2N2(g) + O2(g) + 4H2O(g) e) N2O4(g) 2NO2(g) 12. Which of the following statements is
Answer:
Explanation:
a) O₂(g) + 2H₂(g) = 2H₂O
b) H₂O(l) = H₂O(s)
c) NH₃(g) + HCl(g) = NH₄Cl(g)
d) 2NH₄NO₃(s) = 2N₂(g) + O₂(g) + 4H₂O(g)
e) N₂O₄(g) = 2NO₂(g)
ΔS is positive when there is increase in disorderliness. It happens when there is increase in volume .
Increase is volume is maximus in the following reaction.
d) 2NH₄NO₃(s) = 2N₂(g) + O₂(g) + 4H₂O(g)
in this reaction solid NH₄NO₃ is changed to 7 x 22.4 L of gases so there is maximum increase in volume . Hence maximum increase in entropy . Hence ΔS is most positive .
Graciella divided her grapes equally among 6 friends. If each friend received 16 grapes how many grapes did Graciella have?
Answer: She had 96 grapes.
Explanation:
Answer:
taiks
Explanation:
In the reaction represented by the equation COCl2+2NaI>2NaCl+CO+I2 how many milliliters of a .5500 M solution of NaI are needed to produce 34.81mg of I2?
472.7ml of a .5500 M solution of NaI are needed to produce 34.81mg of I\(_2\) in the reaction COCl\(_2\)+2NaI → 2NaCl+CO+I\(_2\).
What is volume?A measurement of three-dimensional space is volume. Several imperial or US customary units, as well as SI-derived units (such the cubic meter and liter), are frequently used to quantify it quantitatively. Volume and length (cubed) have a symbiotic relationship.
COCl\(_2\)+2NaI → 2NaCl+CO+I\(_2\)
number of moles of I\(_2\) =34.81/254=0.13moles
2 moles of NaI gives 1 moles of I\(_2\)
0.13moles are obtained by 2×0.13=0.26moles of NaI
0.550moles of I\(_2\) is present in 1000ml
0.26moles of I\(_2\) is present in (1000/0.55)×0.26=472.7ml
Therefore, 472.7ml of a .5500 M solution of NaI are needed to produce 34.81mg of I\(_2\).
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What do the dark areas in the large cells
represent? Explain your reasoning.
Answer:I think your talking about the chromatin
Explanation: There dark
-If the pH of the blood is lower than normal, explain how the kidneys attempt to raise
the pH of the blood.
please help! i will mark as brainliest
The amount of available energy decreases with each step up the energy pyramid. How is this related to the fact that there are so many more producers than consumers on Earth? explain
Answer:
Most of the food energy that enters a trophic level is "lost" as heat when it is used by organisms to power the normal activities of life. Thus, the higher the trophic level on the pyramid, the lower the amount of available energy.
Explanation:
How are the chances of surviving and reproducing for an individual with an adaptation to a recent change in its environment higher than the chances of an individual without that adaptation?
Answer: increase an organism's ability to survive and reproduce in an environment.
Explanation: Adaptations are inheritable characteristics that increase an organism's ability to survive and reproduce in an environment. Adaptations can help an organism find food and water, protect itself, or manage in extreme environments.
The passage's author most vividly conveys the sense that Plumpp's poetry is like music when he
O uses words like "swing," "dance," and "sway" to characterize phrases in Plumpp's poems
O defines Plumpp as "the poet laureate of Chicago jazz and blues"
explains how long Plumpp has been writing about "Chicago jazz giants"
urges people to read Plumpp's poems and listen to the music Plumpp "immortalizes in print"
It is an amine, and it has less polar nitrogen-hydrogen and oxygen-hydrogen bonds.
A compound's boiling point is a physical characteristic. These intramolecular linkages between the molecules that make up a chemical affect these physical characteristics.
Alcohols and amino acids have the same kind of intermolecular linkages. The hydrogen bond is the name of this kind of bond.
The electrical attraction between a hydrogen atom from one molecule and an electronegative atom from a nearby molecule is known as a hydrogen bond.
The strength of the bond is in the following order: H.....F > H.....O > H......N
The H....N hydrogen bonds exist in amines, whereas the H....O hydrogen bonds exist in alcohols.
Consequently, the alcohol's hydrogen bonds are stronger and it will impart a higher boiling point on the compound.
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Answer:uses world like
Explanation:
11. As early as 1938. the use of NaOH was suggested as a means of removing CO2 from the cabin of a spacecraft according to the following (unbalanced) reaction: NaOH +CO2-
Na2CO3 + H2O.
a. If the average human body discharges 925,0 g CO, per day, how many moles of NaOH are
needed each day for each person in the spacecraft?
b. How many moles of each product are formed?
For a (unbalanced) reaction: NaOH +CO2-Na2CO3 + H2O, the moles of NaOH and moles of each product are formed are mathematically given as
a) Moles of NaOH =44.05
b) Moles of Na2CO3=21.0
Moles of H2O= 21.0What is the moles of NaOH and what moles of each product are formed?
Generally, the equation for the Chemical reaction is mathematically given as
2 NaOH(aq)+ CO2(g)------> Na2CO3(aq)+ H2O(l)
Therefore
Moles of CO2= 925/44
Moles of CO2=21.0
Hence
Moles of NaOH = 2 x Moles of CO2
Moles of NaOH = 2x925/44
Moles of NaOH =44.05
In conclusion
Moles of Na2CO3 925/44
Moles of Na2CO3=21.0
And
Moles of H2O= 925/44
Moles of H2O= 21.0
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Which most likely indicates a chemical change has occuIn an investigation, the atoms of a certain substance lose energy during a change of state. Before the change, the atoms are far apart and move constantly at high speeds and in all directions. After the change, the atoms are close together but are able to slide past one another.
Use the diagram that shows changes of state between solid, liquid, and gas to answer the question.
A diagram has a triangle at center with gas on top, liquid on bottom right, solid on bottom left. An arrow from gas to liquid is labeled O, and an arrow from liquid to gas is labeled N. An arrow from solid to liquid is labeled P, and an arrow from liquid to solid is labeled Q. An arrow from solid to gas is labeled L, and an arrow from gas to solid is labeled M.
Which arrow represents the substance’s change of state?
A chemical change is the change which is not easily reversed and in which a new substance is formed
Below are some examples of physical changes:
Burning of bushRusting of iron nailsDissolution of metals in acidsWhat is change of state of matter?This is a process which involves the changing of state of matter of from one form or state to another.
When solid change to liquid, it is called meltingWhen liquid change to solid, it is called freezingWhen a solid changes directly to gas on heating, it is called sublimationSo therefore, a chemical change is the change which is not easily reversed and in which a new substance is formed
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Answer: I'm guessing it's O?
Explanation:
Which statement about balanced chemical equations is true?
OA. The mass of the new atoms that are formed equals the mass of
the atoms that made up the reactants.
OB. The total mass of the reactants equals the total mass of the
products.
OC. The total number of moles of products equals the total number of
moles of reactants,
OD. The mass of the products is greater than the mass of the
reactants when the number of moles increases.
SUBMIT
The total mass of the reactants equals the total mass of the products the statement about balanced chemical equations is true. Hence, option B is correct.
This is known as the Law of Conservation of Mass, which states that matter can neither be created nor destroyed in a chemical reaction. In other words, the mass of the reactants must equal the mass of the products in a balanced chemical equation.
While the identities of the atoms may change during a reaction, the total number of atoms of each element on both sides of the equation must be the same, thus leading to the conservation of mass.
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Summarize the observations you collected when cross-linking poly(vinyl alcohol) with Borax in Part III.Discuss the effect of successive additions of Borax to poly(vinyl alcohol). Provide a sound chemical explanation for the behavior you observe.
Polymerization involves the synthesis of two or more monomers to get a polymer which is usually complex.
Polyvinyl alcohol can’t be used as a monomer(raw material) for polymerization because it is very unstable under normal conditions and will rearrange molecularly to give polyvinyl acetaldehyde.
To solve this, we need to use the expression for osmotic pressure which is the following:
π = MRT (1)
Where:
M: Concentration of the solution
R: gas constant (0.082 L atm/ mol K
T: temperature in K
25 °C in Kelvin is: 25 + 273.15 = 298.15 K
Now, we do not have the concentration of the solution, but we do have the mass. and the concentration can be expressed in terms of mass, molar mass and volume:
Concentration (M) is:
M = n/V (2)
and n (moles) is:
n = m/MM (3)
Therefore, if we replace (2) and (3) in (1) we have:
π = mRT/V*MM
Solving for MM we have:
MM = mRT/πV (4)
All we have to do now, is replace the given data and we should get the value of the molar mass:
MM = 6.143 * 0.082 * 298.15 / 0.1 * 0.272
MM = 150.1859 / 0.0272
MM = 5,521.54 g/mol
This is the molar mass.
Therefore, the sound chemical reaction of cross-linking with borax is molar mass 5521.54 g/mol.
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What is the frequency of gamma radiation with energy of 6.96 x 10-14 J?
The frequency of gamma radiation is calculated to be = 1.11 *10^20 Hz.
What is gamma radiation?A gamma radiation is also known as gamma ray. It is a penetrating form of electromagnetic radiation arising from radioactive decay of atomic nuclei. It consists of shortest wavelength electromagnetic waves, even shorter than X-rays.
Gamma rays can pass through the human body completely and as they pass through, they cause ionizations that damage tissue and DNA.
As we know that E= hf
Hence, f= E/h
Given E= 6.96 x 10-14 J
And, Planck's constant, h = 6.626 *10^-34 m² kg/s
f = 6.96 * 10^-14J +/6.626 *10^-34
f = 1.11 *10^20 Hz
Hence, frequency of gamma radiation = 1.11 *10^20 Hz.
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Can H2 be broken down? (Not H)
Hello, this is Bing. I can help you with your question. Based on the information I found on the web, **H2** can be broken down into its two atoms of hydrogen (H) by supplying enough energy to overcome the bond that holds them together⁴. This process is called **dissociation** and requires an energy equal to or greater than the **dissociation energy** of H2, which is about 436 kJ/mol⁴.
One way to break down H2 is by using **electricity** to split water (H2O) into hydrogen (H2) and oxygen (O2) through a process called **electrolysis**¹. In this process, water is decomposed into its elements by passing an electric current through it. The electric current is provided by a battery or another source of electricity and the water needs to have an **electrolyte**, such as salt or acid, added to it to make it conductive¹. Two electrodes, usually made of metal or other conductive material, are inserted into the water and connected to the battery. The electrode connected to the positive terminal of the battery is called the **anode** and the one connected to the negative terminal is called the **cathode**¹. When the electric current flows through the water, hydrogen gas bubbles form at the cathode and oxygen gas bubbles form at the anode¹. The overall chemical reaction for electrolysis of water is:
2 H2O → 2 H2 + O2
Another way to break down H2 is by using **heat** to cause a reaction between hydrogen and oxygen that produces water and releases a large amount of energy. This reaction is called **combustion** or **oxidation** and can be ignited by a spark or a flame³. The reaction is very fast and explosive and can be dangerous if not controlled. The overall chemical reaction for combustion of hydrogen is:
2 H2 + O2 → 2 H2O
I hope this helps you understand how H2 can be broken down and what methods are used to do so.
if there are more products than reactants, does that mean there is an increase in the forward or backward reaction? And if there are more reactants that products, is there an increase in the forward or backward reaction?
Answer:
If there are more products than reactants, that means the reaction has shifted towards the left, which is the backward direction. If there are more reactants than products, that means the reaction has shifted towards the right, which is the forward direction.
What is the difference between fat-soluble and water-soluble vitamins? Name two examples of each type?
A sample of xenon gas occupies a volume of 5.82 L at 453 K. If the pressure remains constant, at what temperature will this same xenon gas sample have a volume of 2.64 L?
Answer:
204.8 K
Explanation:
(P1 * V1)/T1 = (P2 * V2)/T2
"If the pressure remains constant" means
you can cancel the pressure part of the equation
T2 = (V2 * T1)/(V1)
T2 = (2.64 L * 453 K)/(5.82 L)
T2 = 204.8 K
chatgpt
A sample of xenon gas occupies a volume of 5.82 L at 453 K. If the pressure remains constant, the temperature that will make this same xenon gas sample have a volume of 2.64 L is 220K.
What is combined gas law?The combined gas law is the law of of gaseous state which is made by combination of Boyle's law, Charle's law, Avogadro's law and Gay Lussac's law.
It is a mathematical expression that relates Pressure, Volume and Temperature.
(P1 × V1)÷T1 = (P2 × V2)÷T2
We can also use the following relation-
PV = nRT
At constant pressure,
V1÷T1 = V2÷T2
This is Charles's law.
V1 = 5.82L
T1 = 453K
V2 = 2.64L
T2 = ?
T2 = 220K
Therefore, A sample of xenon gas occupies a volume of 5.82 L at 453 K. If the pressure remains constant, the temperature that will make this same xenon gas sample have a volume of 2.64 L is 220K.
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Determine the best way to deal with each of the following items that may dangle into the way during lab work.
flowy sleeves ________
loose bracelets ________
long necklaces _________
long earrings ________
long hair ________
The best way to deal with each of the following items during lab work is as follows:
Flowy sleeves: Roll up or tuck in the sleeves to prevent them from interfering with lab equipment.
Loose bracelets: Remove the bracelets or tuck them under gloves to prevent them from getting caught on equipment.
Long necklaces: Remove the necklaces or tuck them under clothing to prevent them from getting caught on equipment.
Long earrings: Remove the earrings or tuck them under clothing to prevent them from getting caught on equipment.
Long hair: Tie hair back or wear a hairnet to prevent hair from getting caught on equipment.
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what volume litters of oxygen would be ptoduced in the electrolysis which forms 548 litters of hydrogen both gases measured at stp?
The ideal gas law may be used to determine the volume of oxygen created in the electrolysis that produces 548 litres of hydrogen at STP (Standard Temperature and Pressure). PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature, according to the ideal gas equation.
The pressure is 1 atm, the temperature is 273 K, and the number of moles of hydrogen is 548/22.4 = 24.5 in this example. We may compute the volume of oxygen created by rearranging the ideal gas law: V = nRT/P = 24.5*0.082*273/1 = 483.3 litres.
As a result, the volume of oxygen created in the electrolysis at STP that produces 548 litres of hydrogen is 483.3 litres.
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) I have 0.600 g/dl solution of NaOH. What is M? Whan is N?
N of the given NaOH solution is 0.015 N
To find M of the NaOH solution:
Given: 0.600 g/dl solution of NaOH.
Mass of NaOH = 0.600 gVolume = 1 L.
1L of NaOH solution contains 0.600 g NaOH.
Molar mass of NaOH = 40 g/mol
Number of moles of NaOH = Mass of NaOH / Molar mass of NaOH
= 0.600 g / 40 g/mol = 0.015 mol/L
Thus, Molarity (M) of NaOH = 0.015 mol/L.
To find N of the NaOH solution: Normality, N = M × n.
Where M is molarity of solution and n is the number of equivalents of solute in 1 L of solution.NaOH is a monobasic base and it produces 1 H+ ion on dissociation.
Thus, n = 1N = M × n= 0.015 mol/L × 1 equivalent/L= 0.015 N. Therefore, N of the given NaOH solution is 0.015 N.
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The composition of a compound is 28.73% K, 1.48% H, 22.76% P, and 47.03% O. The molar mass of the
compound is 136.1 g/mol.
I
The compound has an empirical formula of \(K_2H_2P_2O_8\) and a molecular formula of \(K_2HPO_4\).
The given compound has a percent composition of K = 28.73%, H = 1.48%, P = 22.76%, and O = 47.03%. Its molar mass is 136.1 g/mol. To determine its molecular formula, we need to find its empirical formula and calculate its molecular formula from its empirical formula.The empirical formula is the smallest whole number ratio of atoms in a compound. It can be determined by converting the percent composition of the elements into their respective moles and dividing each by the smallest number of moles calculated. The moles of K, H, P, and O in 100 g of the compound are: K = 28.73 g x (1 mol/39.1 g) = 0.734 molH = 1.48 g x (1 mol/1.01 g) = 1.46 molP = 22.76 g x (1 mol/30.97 g) = 0.736 molO = 47.03 g x (1 mol/16.00 g) = 2.94 molDividing each by the smallest number of moles gives the following ratios: K = 0.734/0.734 = 1H = 1.46/0.734 = 2P = 0.736/0.734 = 1.002O = 2.94/0.734 = 4. The empirical formula of the compound is \(K_2H_2P_2O_8\). To calculate the molecular formula, we need to determine the factor by which the empirical formula should be multiplied to obtain the molecular formula. This can be done by comparing the molar mass of the empirical formula to the molar mass of the compound.The molar mass of \(K_2H_2P_2O_8\) is: \(M(K_2H_2P_2O_8)\) = (2 x 39.1 g/mol) + (2 x 1.01 g/mol) + (2 x 30.97 g/mol) + (8 x 16.00 g/mol) = 276.2 g/mol. The factor by which the empirical formula should be multiplied is: M(molecular formula)/M(empirical formula) = 136.1 g/mol/276.2 g/mol = 0.4935. The molecular formula is obtained by multiplying the empirical formula by this factor: \(K_2H_2P_2O_8 * 0.4935 = K_2HPO_4\). Therefore, the molecular formula of the compound is \(K_2HPO_4\).The molecular formula of the given compound having a composition of 28.73% K, 1.48% H, 22.76% P, and 47.03% O with a molar mass of 136.1 g/mol is \(K_2HPO_4\). The empirical formula of the compound is \(K_2H_2P_2O_8\). The compound's molecular formula is calculated by determining the factor by which the empirical formula should be multiplied to obtain the molecular formula. The factor is M(molecular formula)/M(empirical formula) = 136.1 g/mol/276.2 g/mol = 0.4935. The molecular formula of the compound is obtained by multiplying the empirical formula by this factor, resulting in the molecular formula \(K_2HPO_4\).For more questions on empirical formula
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The correct question would be as
The composition of a compound is 28.73% K. 1.48% H, 22.76% P, and 47.03% O. The molar mass of the compound is 136.1 g/mol. What is the Molecular Formula of the compound?
\(KH_2PO_4\\KH_3PO_4\\K_2H_4P_20_{12}\\K_2H_3PO_6\)
Question 6 (1 point)
Consider the hypothetical equilibrium system below:
A+B+C
What is the equilibrium constant of this system if the initial concentrations of A and
B were each 0.238 M, and the equilibrium concentration of C is 0.072?
Your Answer:
The equilibrium constant of the system can be obtained as 2.6.
What is the equilibrium constant?We know that we have to obtain the equilibrium constant by setting up the ICE table of the reaction as we can see in the portion below and this is shown as;
A + B ⇆ C
I 0.238 0.238 0
C -x -x +x
E 0.238 - x 0.238 - x 0.072
At equilibrium, we would have;
[A] = 0.238 - 0.072
= 0.166
[B] = 0.238 - 0.072
= 0.166
Then;
K = [C]/[A] [B]
K = [0.072]/(0.166)^2
K = 2.6
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Jaxson needs to react 16.3 moles of copper (II) nitrate, Cu(NO3)2, in a chemical reaction. How many grams of crystals
does he need to weigh out?
Answer:
3056.25g
Explanation:
Problem here is to find the mass of Cu(NO₃)₂ to weigh out to make for the number of moles.
Given;
Number of moles = 16.3moles
Unknown:
Mass of Cu(NO₃)₂ = ?
Solution:
To find the mass of Cu(NO₃)₂, use the expression below;
Mass of Cu(NO₃)₂ = number of moles x molar mass
Let's find the molar mass;
Cu(NO₃)₂ = 63.5 + 2[14 + 3(16)]
= 63.5 + 2(62)
= 187.5g/mol
Mass of Cu(NO₃)₂ = 16.3 x 187.5 = 3056.25g
A chemistry student collected 0.032l of H2 gas at 1.1 atm pressure and 24C, using the following chemical reaction. How many grams of magnesium must have reacted?
Mg (s) + HCl 9 (aq) becomes H2 9g) + MgCl2 (aq)
We need more information to solve this problem. Specifically, we need to know the volume (or concentration) of HCl used to react with the Mg. Without that information, we cannot determine how many grams of Mg reacted.
why is food coloring added to water and it turning blue is a physical change
Answer:
No new substance is formed.
Explanation:
Explain two positive aspects of using methane recapture systems.
Answer:
Two positive aspects of using methane recapture systems are able to generate significant electricity. Another benefit is that the process of anaerobic digestion creates heat that can be used to warm buildings where animals are kept
Answer: The correct answer is;
Two positive aspects of using methane recapture systems include lowering the impact on greenhouse gasses and the production of energy. Methane is a very potent greenhouse gas that is contributing to global warming. As a result, the recapturing process reduces the methane impacts of global warming by reclaiming and reusing the gas for other purposes. Recaptured methane can be stored and used to generate electricity or used as fuel to power updated vehicles and other engines on the farm. The overall benefits from this combination are reducing impacts causing global warming and lower the cost of electricity or fuel on the farm.
Explanation: This answer has been confirmed correct.
When does a car no longer have kinetic energy