Answer:
percent yield = 80.7%
Theoretical yield of silver sulfide = 30.975 g
Actual yield = 25 g
Explanation:
Given data:
Mass of silver = 27 g
Mass of silver sulfide formed = 25 g
Theoretical yield of silver sulfide = ?
Actual yield = ?
Percent yield = ?
Solution:
Chemical equation:
2Ag + S → Ag₂S
Number of moles of Ag:
Number of moles = mass/molar mass
Molar mass of silver = 107.8 g/mol
Number of moles = 27 g/ 107.8 g/mol
Number of moles = 0.25 mol
Now we will compare the moles of silver with silver sulfide.
Ag : Ag₂S
2 : 1
0.25 : 1/2×0.25 = 0.125 mol
Theoretical yield of silver sulfide:
Mass = number of moles × molar mass
Mass = 0.125 mol × 247.8 g/mol
Mass = 30.975 g
Actual yield is given in question = 25 g
Percent yield:
Percent yield = (actual yield / theoretical yield) × 100
Percent yield = (25 g/ 30.975 g ) × 100
percent yield = 80.7%
How many moles are in 54 grams of C?
what is the empirical formula for 27.3% and 72.7% oxygen?
Answer:
27.3% of Carbon (C), 72.7% of Oxygen (O).
Hydrogen bonds are in the family of Van der Waals forces. They are weaker than ionic and covalent bonds but they cause interesting changes with different chemicals.
What is one of the changes that hydrogen bonds are responsible for?
A. Cause DNA has the double helix shape.
B. Causes salts quickly dissolve in water.
C. Cause sugar looks like a crystal.
D. Cause liquid H2O to have a larger volume than frozen (solid) H2O
Answer:
The answer is B. Van der Waals forces are weaker than ionic and covalent bonds.
Explanation:
In general, if we arrange these molecular forces from the strongest to weakest, it would be like this:
Covalent bonds > Ionic bonds > Hydrogen bonds > Dipole-Dipole Interactions > Van der Waals forces
Covalent bonds are known to have the strongest and most stable bonds since they go deep and into the inter-molecular state. A diamond is an example of a compound with this characteristic bond.
Ionic bonds are the next strongest molecular bond following covalent bonds. This is due to the protons and electrons causing an electro-static force which results to the strong bonds. An example would be Sodium Chloride (NaCl), which when separated is Na⁺ and Cl⁻.
Van der Waals forces, also known as Dispersion forces, are the weakest type of molecular bonds. They are only formed through residual molecular attractions when molecules pass by each other. It doesn't even last long due to the uneven electron dispersion. It can be made stronger by adding more electrons in the molecule. This kind of molecular bonds appear in non-polar molecules such as carbon dioxide.
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The change that Hydrogen Bonds are most likely responsible for would be:
B). Causes salts to quickly dissolve in water.
As per the details provided, the hydrogen bonds are classified into the category of Van der Waals forces and the primary reason behind this has been that it leads salt to solvate immediately in the water. Amongst all the bonds, covalent bonds are characterized as the toughest while ionic bonds and hydrogen bonds are followed by it in terms of strength.The reason for which hydrogen bonds cause the change of allowing salts to dissolve immediately is that it illustrates a weaker strength of molecules due to its formation with residual uneven construction.Thus, option B is the correct answer.
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10 While a student is holding a piece of metal in her hand, her hand gets colder. What happens to the temperature of the metal? * m (6 Points) A. The piece of metal will get warmer because some thermal energy is transferred from the metal to the student's hand. B. The piece of metal will get warmer because some thermal energy is transferred from the student's hand to the ON metal. C. The piece of metal will stay at the same temperature because an equal amount of thermal energy is exchanged between the student's hand and the metal. D. The piece of metal will stay at the same temperature because thermal energy is not transferred between the student's hand and the metal.
Answer:
B
Explanation:
thermal energy is the energy between one object to another
Can SOMEONE PLEASE HELO
Answer:
D
Explanation:
you should repeat an experiment at least 3 times
how does a diaphragm help in viewing the specimen in a microscope
Answer:
Diaphragm controls the amount of light reaching the specimen. It is located above the condenser and below the stage. Most high quality microscopes include an Abbe condenser with an iris diaphragm. Combined, they control both the focus and quantity of light applied to the specimen.
What are redox half-reactions?
Answer:
C. Equations that separate the oxidation and reduction parts of the reaction.
Explanation:
Redox half-reactions are actually used when balancing redox reactions. It gives the oxidation or reduction reaction components/parts of a redox reaction. The change in oxidation and reduction states in the substances that are involved in a redox reaction is used to obtain a redox half-reaction.
This redox half-reaction can also be used to explain what takes place in an electrochemical cell; how the anode is undergoing oxidation and how the cathode is undergoing reduction.
Below is an example of a redox half-reaction:
2 Fe³⁺(aq) + 6e⁻ → 2 Fe(s) (Reduction)
3 Mg(s) → 3 Mg²⁺(aq) + 6e⁻ (Oxidation)
How do particles Behave differently in a solid, liquid, or gas
Answer:
gas vibrate and move freely at high speeds. liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place.
Answer:
The soilds vibrate in a fixed position and are very packed together whilst in liquids they are close together but they can move around and gases are widely spaced and move around randomly
Explanation:
How much energy is required to melt 2 kg of copper? Use the table below and
this equation: Q = mLfusion
A. 125.6 kJ
B. 9460 kJ
C. 414 kJ
D. 4730 kJ
Answer:
C. 414 kJ
Explanation:
Given parameters:
Mass of copper = 2kg
Unknown:
Amount of energy required to melt the copper = ?
Solution:
To solve this problem, we use:
Q = m L
m is the mass
L is the latent heat of fusion of copper = 207kJ/kg
So;
Q = 2 x 207 = 414kJ
What is one possible excited state configuration for fluorine? *
Answer:
Excited State Configuration: 1s^2 2s^2 2p^4 3s^1 are sperated by 13.00 eV.
Two moles of MgsO4•7H2O contain ___ grams of MgSO4•7H2O
Answer:
492.6g
Explanation:
Given parameters:
Number of moles of MgSO₄.7H₂O = 2moles
Unknown:
Mass = ?
Solution:
To find the mass of this compound;
Mass = number of moles x molar mass
Molar mass of MgSO₄.7H₂O = 24.3 + 32 + 4(16) + 7[2(1) + 16]
= 246.3g/mol
Mass = 2 x 246.3 = 492.6g
What happens to hydrogen during hydrogen bonding?
The proton spends a lot of time away from hydrogen and hydrogen's electron is exposed for
interaction
The electron spends a lot of time away from hydrogen and hydrogen's electron is exposed for
interaction
The electron spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for
interaction
The proton spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for
interaction
Answer:
The electron spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for
interaction
Explanation:
I got the question right
During hydrogen bonding, The electron of hydrogen spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for interaction. Option C is correct.
The presence of hydrogen atoms bound to strongly electronegative elements like nitrogen, oxygen, or fluorine as well as the polarity of the molecule determine whether hydrogen bonds are present in the molecule.
The electron density in the bond between a hydrogen atom and one of these electronegative atoms shifts in favor of the electronegative atom, giving rise to a partial positive charge on the hydrogen atom and a partial negative charge on the electronegative atom. Therefore, the hydrogen atoms in one molecule can establish hydrogen bonds with the electronegative atoms in other molecules.
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The question should be
What happens to hydrogen during hydrogen bonding?
a)The proton spends a lot of time away from hydrogen and hydrogen's electron is exposed for interaction
b)The electron spends a lot of time away from hydrogen and hydrogen's electron is exposed for interaction
c)The electron spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for interaction
d) The proton spends a lot of time away from hydrogen and hydrogen's nucleus is exposed for interaction
Laura has three beakers. Each contains 200 cm3 of a colourless liquid. Suggest how Laura could nd out which beakers contain pure water, and which contain solutions.
Answer:
See explanation
Explanation:
A pure liquid has a sharp boiling point. Now we know that the boiling point of water is 100°C.
If Laura begins to heat each liquid with a thermometer inserted into each liquid, the liquid that boils at exactly 100°C is pure water while the rest are solutions.
An atom of barium has the atomic symbol shown below. Which statement is FALSE regarding this atom of barium?
Answer:
C. The atomic number of this atom is 138
Explanation:
Answer:
C
Explanation:
White gold is used in jewelry and contains two elements, gold and palladium. A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?
A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. (1) Since it is given that the white gold is having a uniform composition throughout.So,it means this is a Homogeneous mixtures.
How many elements are solid at freezing?
Consider the reaction below.
2 Na + O2 → Na2O2
If 10.0 g of sodium metal reacts with excess oxygen gas how many grams of sodium oxide will be produced?
Show your work below. Make sure to show ALL units and each step of the process:
Answer:
I think 5
Explanation:
WHAT TWO PLANT CELLS DONT PRODUCE PROTINES?!?!?!?!?
What would Thomson's model and Rutherford's model of the atom have in common?
Answer:
Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup." Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.
Explanation:
Answer:
From another website, “Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup." Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.”
Explanation:
Which of these best describes a scientific law?
• a rule made by a government
• a rule that does not depend on observable evidence
• a statement which varies under the same conditions
• a statement about how things act in the natural world
Which of the following is not a property of most
transition metals?
Answer:
Low melting point
Explanation:
Transition metals have the following properties:
Conductivity (Electrical and Thermal)
Malleability (You can hit it with a hammer to mold it)
High melting point
Answer:
Low melting point
Explanation:
Most transition metals property is high melting point.
What is the mass in grams of 0.40 moles of sodium borohydrate NaBH4
Answer:
Mass = 15.12 g
Explanation:
Given data:
Mass of sodium borohydride = ?
Number of moles of sodium borohydride =0.40 mol
Solution:
Formula:
Mass = number of moles / molar mass
Molar mass of sodium borohydride = 37.8 g/mol
By putting values,
Mass = 0.40 mol × 37.8 g/mol
Mass = 15.12 g
What causes the wind and weather on earth plz help
can we seperate naphthalene from sugar by filtration to obtain pure sugar?
Answer:
As Naphthalene undergoes sublimation, we use sublimation process. On condensing naphthalene can be separated.
a. Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are (higher, lower, or about the same).
b. Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are (higher, lower, or about the same).
c. Which is the only noble gas listed that is stable as a liquid at 0°C? Explain your answer using the concept of critical temperature.
Answers are below...and I have answered this question on the basis of above table.
Explanation :-
(a.) Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are (lower).
(b.) Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are (higher).
(c.) Xe (Xenon), a substance can exist only as a gas at temperatures above its critical temperature. Of the noble gases listed, only Xe has a critical temperature above O°c.
Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are lower. Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are higher.Xenon can exist only as a gas at temperatures above its critical temperature.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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A closed container is the best way to measure the volume of a
A. gas
B. liquid
C. solid
D. Both A and B are correct.
Answer:
A closed container is the best way to measure the volume of a liquid
Give a real-world example of an energy transformation that uses two of the following forms of energy: chemical, mechanical, nuclear, gravitational, radiant, electrical, thermal (heat), and/or sound.
Answer:
Chemical Energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy. Chemical energy is converted to thermal energy when we burn wood in a fireplace or burn gasoline in a car's engine.
MARK BRAINLIST PLZ NEEDS ONE MORE
Explanation:
How many grams of K2Cr2O7, are soluble in 100 g of
water at 95 °C?
Answer:
75 grams
Explanation:
At 95 °C, you can dissolve up to 75 grams of K2Cr2O7 in 100 mL of water.
What is solubility?The solubility of a substance in a particular solvent is the maximum amount of that substance that can dissolve in the solvent at a given temperature. The solubility of a substance can be affected by factors such as temperature, pressure, and the presence of other substances.
For K2Cr2O7, the solubility in water is highly dependent on temperature. At 95 °C, the solubility of K2Cr2O7 in water is approximately 75 g/100 mL. This means that at 95 °C, you can dissolve up to 75 grams of K2Cr2O7 in 100 mL of water. Since 100 g of water is equivalent to 100 mL, you can dissolve up to 75 grams of K2Cr2O7 in 100 g of water at 95 °C.
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Helpppppppp I honestly have no clue
30g of solute is dissolved in 100g of water. Calculate its % (m/m) concentration.
Answer:
23%
Explanation: