Answer:
Calcium chloride
Explanation:
Colligative property depends upon number of particles. The colligative property is independent of the nature of solute present in a solution.
More the number of particles larger the colligative property.
The following are colligative property
a) depression in freezing point
b) elevation in boiling point
c) relative lowering of vapor pressure
d) osmotic pressure
Thus if we wish to melt the we will take calcium chloride as it will give more number of ions per molecules as compared to sodium chloride.
How many moles of hydrogen gas (h2) would be produced from the reaction of 0.30 moles of water (h2o) and excess sodium? (na)?
When 0.30 moles of water react with excess sodium, 0.15 moles of hydrogen gas are produced, judged by the 2:1 molar ratio between water and hydrogen in the reaction.
Explanation:The reaction between water (H2O) and sodium (Na) produces sodium hydroxide (NaOH) and hydrogen gas (H2). The balanced chemical equation for this reaction is: 2Na + 2H2O -> 2NaOH + H2.
In this reaction, it's clear that the molar ratio between water and hydrogen gas is 2:1. That means, for every two moles of water consumed in the reaction, one mole of hydrogen gas is produced. If only 0.30 moles of water is reacted, then 0.30 / 2 = 0.15 moles of hydrogen gas would be produced.
So, in the reaction of 0.30 moles of water and excess sodium, 0.15 moles of hydrogen gas would be produced.
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One of the several oxides of tin found in the earthâs crust is 78.77% by mass tin. what is its empirical formula and name?
Final answer:
The empirical formula of the tin oxide with 78.77% tin by mass is SnO2, also known as tin (IV) oxide.
Explanation:
One of the several oxides of tin found in the earth's crust is 78.77% by mass tin. To determine its empirical formula and name, we first assume a 100 g sample for simple calculations. This approach implies we have 78.77 g of tin (Sn) and the remainder, 21.23 g, being oxygen (O).
To find the mole ratio, we divide the mass of each element by its respective atomic mass (Sn = 118.71 g/mol, O = 16.00 g/mol), resulting in:
By dividing each element's mole count by the smallest number of moles obtained, we find the empirical formula ratio. In this case, the ratio for Sn to O approximates to 1:2. Hence, the empirical formula of the tin oxide in question is SnO2, which is commonly named tin (IV) oxide.
What are the vertical columns on a periodic table called
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)?
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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What is being oxidized?
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 solution of sucrose in water has a boiling point that is _____ 100°C.
Metals present in municipal wastewater may still be present in treated sewage sludge; ______
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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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?
Solid barium sulfate dissolves into its respective ions at 25°C. Suppose that in a particular solution, [Ba2+ ] = 1.76 x 10-3 M. Find the value of Ksp.
Answer:
The value of solubility product of barium sulfate is [tex] 3.09\times 10^{-6}[/tex].
Explanation:
[tex]BaSO_4\rightarrow Ba^{2+}+SO_4^{2-}[/tex]
S S
1 mole of barium sulfate dissociates into 1 mole of barium ion and one mole sulfate ion.
So, [tex][Ba^{2+}]=[SO_4^{2-}]=S[/tex]
[tex][Ba^{2+}]=S=1.76\times 10^{-3} M[/tex]
The solubility product the barium sulfate will be given by:
[tex]K_{sp}=S\times S=S^2[/tex]
[tex]K_{sp}= (1.76\times 10^{-3})^2=3.09\times 10^{-6}[/tex]
The value of solubility product of barium sulfate is [tex] 3.09\times 10^{-6}[/tex].
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?
In metallic bonding, the electrons
Answer:
In metallic bonds the electrons of the valence shell can move freely within the metal, thus explaining its electric conductivity.
Which drawing depicts the electron configuration of nitrogen?
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?
Potassium-40 has a half-life of 1.25 billion years (by) and decays to argon-40. how old is a fossil that has a 40k/40ar ratio of ~ 26%?
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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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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Friction is not related to the efficiency of a machine.
True
False
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
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
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)
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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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.
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
How can you distinguish a substance from a mixture
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.
The partial charges on a water molecule occur because of ______________.