if you drop a 50 gram piece of metal with a temperature of 125° Celsius into 1000 grams of water at 20° Celsius, what best describes what would occur?
Metals present in municipal wastewater may still be present in treated sewage sludge; ______
What is being oxidized?
Compare rutherford's expected outcome of the gold-foil experiment with the actual outcome.
Final answer:
Rutherford's expected outcome of the gold-foil experiment was for the alpha particles to pass through the foil un-deflected, but the actual outcome showed scattering of the particles at large angles. This discovery challenged the plum pudding model of the atom and led to the development of the nuclear model.
Explanation:
Rutherford's expected outcome of the gold-foil experiment was that the alpha particles would pass through the gold foil un-deflected, similar to bullets passing through a Styrofoam sheet. However, the actual outcome of the experiment showed that while most of the alpha particles did pass through the foil without deflection, some were scattered at large angles and a few even came back in the direction they came from.
This result, known as Rutherford scattering, indicated that the gold nuclei were actually very small compared to the size of the gold atom. It suggested the presence of a small, dense, positively-charged nucleus at the center of the atom. This discovery challenged the plum pudding model of the atom and led to the development of the nuclear model of the atom.
If liquid a is more volatile than liquid b, which is also true? hints if liquid a is more volatile than liquid b, which is also true? liquid a has a lower vapor pressure than liquid
b. liquid a has stronger intermolecular forces than liquid
b. liquid a evaporates more slowly than liquid
b. liquid a has a lower boiling point than liquid
b.
Answer:
Liquid a has a lower boiling point than liquid b.
Explanation:
Hello,
In this case, volatility is associated with three factors:
1. Vapor pressure: this is the pressure exerted by the gas molecules in equilibrium with the liquid. The higher the vapor pressure, the higher the volatility.
2. Intermolecular forces: are the interactions attracting or repelling the material's molecules. The stronger the forces, the lower the volatility as the molecules remain strongly closer.
3. Boiling point: is the condition of both temperature and pressure at which a liquid passes from liquid to gas. The lower the boiling point, the higher the volatility as more molecules easily pass from liquid to gas.
In such a way since liquid a is more volatile than liquid b, the answer is liquid a has a lower boiling point than liquid b based on the aforesaid factors.
Best regards.
A glucose solution is 3.25% glucose by mass and has a density of 1.03 g/ml. what mass of glucose is contained in 58.2 ml of this solution?
Calculate the amount of heat required to vaporize 84.8 g of water at its boiling point.
Answer: Amount of heat required to vaporize 84.8 g of water is 191.7kJ.
Explanation: We are given 84.8 grams of water, to convert it into moles, we use the formula:
[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Molar mass of water = 18 g/mol
[tex]Moles=\frac{84.8g}{18g/mol}=4.71moles[/tex]
As we know that [tex]\Delta H_{vap}[/tex] for 1 mole of water at 100° C is 40.7 kJ/mol
So, to calculate the amount of heat required, we use the formula:
[tex]q=m\Delta H_{vap}[/tex]
Putting the values in above equation, we get
[tex]q=4.71mol\times 40.7kJ/mol[/tex]
q = 191.7kJ
which of the following is the most reasonable explanation for a drop in temperature of gas?
A) a decrease in the volume of the container
B) a decrease in the average kinetic energy of the gas particles
C)an increase in the average potential energy of the gas particles
D) an increase in gas pressure
Answer: The correct answer is option B.
Explanation:
Average kinetic energy of the gas molecule is given by relation:
[tex]E_K=\frac{3}{2}\frac{R}{N_A}\times T[/tex]
[tex]N_A[/tex] = Avogadro Number
T = Temperature of the gas in Kelvins.
R = Universal gas constant
[tex]E_K\propto T[/tex]
With increase in temperature the kinetic energy of the gas molecule increases and vice-versa.
So, according to the question the explanation for a drop in temperature of the gas is decrease in average kinetic energy of the gas molecules.
Hence, the correct answer is option B.
Petrolyn motor oil is a combination of natural oil and synthetic oil. it contains 8 liters of natural oil for every 5 liters of synthetic oil. in order to make 728 liters of petrolyn oil, how many liters of synthetic oil are needed?
Which statements about viscosity are true? (i) viscosity increases as temperature decreases. (ii) viscosity increases as molecular weight increases. (iii) viscosity increases as intermolecular forces increase?
Answer : All the statements are true.
Explanation :
Viscosity : It measures the resistance of a liquid to flow is known as the viscosity.
There are many factors affects the viscosity which are temperature, pressure, molecular weight and inter-molecular forces.
Viscosity and Temperature :There is an inverse relationship between the viscosity and the temperature. As the temperature decreases, viscosity increases and the temperature increases, viscosity decrease.
Viscosity and Pressure :There is a direct relationship between the viscosity and the pressure. As the pressure decreases, viscosity decreases and the pressure increases, viscosity increases.
Viscosity and Molecular weight :There is a direct relationship between the viscosity and the molecular weight. As the molecular weight decreases, viscosity decreases and the molecular weight increases, viscosity increases.
Viscosity and Inter-molecular force :There is a direct relationship between the viscosity and the inter-molecular force. As the inter-molecular force decreases, viscosity decreases and the inter-molecular force increases, viscosity increases.
Hence, all the statements are true.
Statements about viscosity are true:
(i) viscosity increases as temperature decreases.
(ii) viscosity increases as molecular weight increases.
(iii) viscosity increases as intermolecular forces increase
Viscosity is a measure of a fluid's resistance to flow. A viscous fluid flows slowly, while a non-viscous fluid flows quickly.
(i) Temperature affects viscosity because it affects the kinetic energy of the molecules in a fluid. As temperature decreases, the kinetic energy of the molecules decreases. This means that the molecules move more slowly, and the fluid becomes more viscous.
(ii) Molecular weight affects viscosity because it affects the strength of the intermolecular forces between the molecules in a fluid. As molecular weight increases, the intermolecular forces become stronger. This means that it is more difficult for the molecules to move past each other, and the fluid becomes more viscous.
(iii) Intermolecular forces affect viscosity because they are the forces that hold the molecules in a fluid together. As intermolecular forces increase, the molecules are held more tightly together. This means that it is more difficult for the molecules to move past each other, and the fluid becomes more viscous.
Therefore, all three statements about viscosity are true.
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How many moles of libr are contained in 347 g of water in a 0.175 m libr solution?
Answer:
Molaridad = número de lunares de soluto/Kg de disolvente
La molaridad se da en el problema como 0,175 m
Masa de disolvente = 347 gm = 0,347 Kg
por lo tanto
0.175 = número de lunares de LiBr / 0.347
número de lunares de LiBr = 0,175 x 0,347 = 0,060725 lunares
Explanation:
The partial charges on a water molecule occur because of ______________.
Consider three 10-g samples of water: one as ice, one as liquid, and one as vapor. how do the volumes of these three samples compare with one another?
Ice has the largest volume, followed by liquid water, and then water vapor.
Explanation:Water is one of the few substances on Earth that exists naturally in all three states: solid (ice), liquid (water), and gas (water vapor). The density of each state of water varies, with the vapor state being the least dense and the liquid state being the most dense. The solid state, which is ice, is less dense than the liquid state. So, in terms of volume, the ice sample will have the largest volume, followed by the liquid water sample, and then the water vapor sample, which will have the smallest volume.
Which of the following quantum number combinations is not allowed in a ground-state atom? (7, 4, -2, -½) (3, 0, 0, +½) (2, 1, 1, -½) (3, 2, 3, +½)
Use Cell Membrane in a sentence
The function of cell membrane is to protect the cell from its surroundings by controlling the movement of substances in and out of the cells.
What is cell membrane?
The cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell, and that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell. Another is that the membrane of the cell, which would be the plasma membrane, will have proteins on it which interact with other cells.
Those proteins can be glycoproteins, meaning there's a sugar and a protein moiety, or they could be lipid proteins, meaning that there's a fat and a protein. And those proteins which stick outside of the plasma membrane will allow for one cell to interact with another cell. The cell membrane also provides some structural support for a cell.
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What isotope has 13 protons and 14 neutrons? enter the name of the element followed by a hyphen and the mass number (e.g., uranium-234)?
Solid lead(ii) sulfide reacts with aqueous hydrochloric acid to form solid lead(ii) chloride and dihydrogen sulfide gas. express your answer as a chemical equation. identify all of the phases in your answer.
Answer: The chemical equation is;
[tex]PbS(s)+2HCl(aq)\rightarrow PbCl_2(s)+H_2S(g)[/tex]
Explanation:
The described reaction between solid lead sulfide and aqueous hydrochloric acid can represented in the in the form of chemical equation as given below:
[tex]PbS(s)+2HCl(aq)\rightarrow PbCl_2(s)+H_2S(g)[/tex]
1 mol of lead(ii) sulfide reacts with hydrochloric acid to give 1 mole of lead chloride and hydrogen sulfide gas.
The balanced chemical equation is: PbS(s) + 2 HCl(aq) -> PbCl2(s) + H2S(g)
Explanation:The balanced chemical equation for the reaction between solid lead(II) sulfide and aqueous hydrochloric acid is:
PbS(s) + 2 HCl(aq) -> PbCl2(s) + H2S(g)
In this reaction, solid lead(II) sulfide reacts with hydrochloric acid to produce solid lead(II) chloride and dihydrogen sulfide gas. The phases in the equation are represented by 's' for solid, 'aq' for aqueous, and 'g' for gas.
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The net ionic equation for the reaction between aqueous sulfuric acid and aqueous sodium hydroxide is ________.
The net ionic equation for the reaction will be [tex]\rm \bold{2\;H^+\;+\;2\;OH^-\;\rightarrow\;2\;H_2O}[/tex].
A chemical equation has been the chemical representation of the reactants involved with the formed products. The ionic equation has been consisted of the ionic form of the reactants and products.
The reaction for Sulfuric acid and Sodium hydroxide will be:
[tex]\rm H_2SO_4\;+\;2\;NaOH\;\rightarrow\;Na_2SO_4\;+\;2\;H_2O[/tex]
The ionic equation for reactants will be:
[tex]\rm H_2SO_4\;+\;2\;NaOH[/tex] = [tex]\rm 2\;H^+\;+\;SO_4^2^-\;+\;2\;Na^+\;2\;OH^-[/tex]
The ionic equation for the products has been:
[tex]\rm Na_2SO_4\;+\;2\;H_2O[/tex] = [tex]\rm 2\;Na^+\;+\;SO_4^2^-\;+\;4\;H^+\;+\;2\;O^-[/tex]
The total equation will be:
[tex]\rm 2\;H^+\;+\;SO_4^2^-\;+\;2\;Na^+\;2\;OH^-[/tex] [tex]\rightarrow[/tex] [tex]\rm 2\;Na^+\;+\;SO_4^2^-\;+\;4\;H^+\;+\;2\;O^-[/tex]
In the net ionic equation, the ions same on both sides of the products and reactants are eliminated.
The net ionic equation for the reaction will be:
[tex]\rm 2\;H^+\;+\;2\;OH^-\;\rightarrow\;4\;H^+\;+\;2O^-[/tex]
[tex]\rm \bold{2\;H^+\;+\;2\;OH^-\;\rightarrow\;2\;H_2O}[/tex]
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Earth is the only planet that has a _____ and a _____.
An electrochemical cell is powered by the half reactions shown below.
Ag+(aq) + e– Ag(s) Eo = +0.80 V
Pb2+(aq) + 2e– Pb(s) Eo = –0.13 V
Which value represents the overall electric cell potential?
Use Ecell = Ered, cathode – Ered, anode.
–0.13 V
–0.93 V
+0.67 V
+0.93 V
Write balanced chemical equation for the oxidation of fe2+(aq) by s2o2−6 (aq).
According to Charles law, which two quantities are directly proportional?
A.) time and pressure
B.) volume and pressure
C.) volume and temperature
D.) pressure and temperature
Describe, on a molecular level, how you would expect these lipids to behave in water.
According to the concept of solubility and lipids being hydrophobic they are insoluble in water and hence would float on water.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Which drawing depicts the electron configuration of nitrogen?
A certain compound is made up of two chlorine atoms, one carbon atom, and one oxygen atom. what is the chemical formula of this compound
Answer:
ClCO2
Explanation:
What is the concentration, in grams per liter, of a solution prepared by dissolving 0.00040 mol HCl in 2.2 L H2O? Assume that the volume of the solution does not change when the HCl is added.
On Ed. the exact answer is 0.0066.
A solution of sucrose in water has a boiling point that is _____ 100°C.
A compound is a liquid at room temperature, dissolves in water, and the resulting solution is weakly conducting. the compound is polar molecular: true of false?
Final answer:
The compound being a liquid at room temperature, dissolving in water, and the resulting solution being weakly conducting indeed suggests it is a polar molecular compound. This is because its behavior aligns with polar molecular compounds' typical properties, such as solubility in water and poor conductivity compared to ionic solutions.
Explanation:
The statement that a compound is a liquid at room temperature, dissolves in water, and the resulting solution is weakly conducting, indicating that the compound is polar molecular, is true. This can be understood by considering the basic properties of molecular and ionic compounds. Molecular compounds, which are composed of molecules formed by covalent bonds, can be polar if they have an uneven distribution of electron charge. When such a polar molecular compound dissolves in water, which itself is a polar solvent, it can interact with water molecules through hydrogen bonding or dipole-dipole interactions. This explains the solubility of the compound in water.
However, the weak conductivity of the solution suggests that it does not contain free ions in large amounts, as would be expected from an ionic compound dissolved in water. Instead, the slight conductivity can be attributed to a small degree of ionization or the presence of polar molecules that are not completely non-conductive but are far less efficient in conducting electricity than ions. Therefore, considering the compound's liquid state at room temperature, its solubility in water, and its weak electrical conductivity in solution, it aligns well with the characteristics of a polar molecular compound rather than an ionic compound.
A student arranged the four cards sequentially in a row on the basis of the periods when these events occurred. The card showing the earliest event was placed on the extreme left. Which of these cards was placed third in the row?
The sequences of the geological happenings in the periodical order is called the geological time's scale. The card of the third row depicts the first flowering plant.
What is the order of the events?Events of the evolution can be explained based on the geological timelines and are arranged on the basis of their discoveries. In the question, the order of the events is arranged from the earliest to the newest.
The earliest event was the appearance of life in the sea followed by the rock formation. The third event was the appearance of the flowering plant on the land followed by land animals.
Therefore, the third card depicts the flowering land plant.
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Which class of molecules contains the carbonyl group, co?
There are many compounds in organic chemistry containing carbonyl group as the part of their structure.
First kind of compounds with carbonyl group are carbonyl compounds (aldehyde with R-CHO and ketone, RCOR' as their structural formula)
Next, Carboxylic acid and their derivatives
Carboxylic acid: RCOOH
Ester: RCOOR'
Acid chloride: RCOCl
Anhydride: (RCO)2O
Amide: RCONH2
And carbohydrates, amino acids also have Carbonyl group in their structures.
Structure of carbonyl group: -C=O