Answer: The statement 'a molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor' is true.
Explanation:
A molecule or ion that donates hydrogen in a hydrogen bond is called a hydrogen donor.
For example, [tex]NH_{3} + H_{2}O \rightarrow NH^{+}_{4} + OH^{-}[/tex]
Here, [tex]NH_{3}[/tex] is donating the hydrogen ion to water molecule. Whereas water is accepting the hydrogen ion so water is a hydrogen bond acceptor. Therefore, hydrogen bond is formed by [tex]NH_{3}[/tex].
Thus, we can conclude that the statement 'a molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor' is true.
Consider the following chemical reaction:
4 Al(s) + 3 O2(g) ⟶2 Al2O3(s)
If 4.2 grams of Al reacts with 3.0 grams of O2,
1. How many grams of Al2O3 could be produced?
2. Which reactant is limiting?
3. Which reactant is excess?
4. How much of the excess reactant would remain?
Answer:
1. mAl₂O₃ = 6.42 g
2. O₂
3. Al.
4. mAl = 1.67 g
Explanation:
Let's calculate the moles of Al and O2 first before doing any other calculations. The molecular weights of Al and O are 26.98 g/mol and 16 g/mol, so the moles are:
moles = mass / Atomic weight or molar mass
moles Al = 4.2 / 26.98 = 0.156 moles
moles O2 = 3 / (2*16) = 0.094 moles
The molar mass of Al2O3 is:
MM = (2 * 26.98) + (3*16) = 101.96 g/mol
With these data, let's determine each part:
1, 2 and 3. Grams of Al2O3, limiting and excess reactant:
To do this, we need to know which is the limiting reactant. this reactant will tell us how many moles are produced of Al2O3 and then, with the previously calculated molar mass, we can determine its mass. Let's see again the overall reaction taking place:
4Al + 3O₂ ---------> 2Al₂O₃
According to this reaction, 4 moles of Al reacts with 3 moles of oxygen, so:
If: 4 moles Al ---------> 3 moles O₂
Then: 0.156 moles ----------> X
X = 0.156 * 3/4 = 0.117 moles of O₂ required.
However, we do not have 0.117 moles of O₂, we have 0.094 moles, therefore we can conclude that the oxygen is the limiting reactant and Aluminum is the excess reactant.
Now, the moles produced of Al₂O₃ will be:
3 moles O₂ -------> 2 moles Al₂O₃
0.094 moles -------> Y
Y = 0.094 * 2/3 = 0.063 moles of Al₂O₃
Finally the mass would be:
mAl₂O₃ = 0.063 * 101.96
mAl₂O₃ = 6.42 g4. mass of excess reactant:
The mass of excess reactant would be:
moles Al = 0.156 - 0.094 = 0.062 moles
mAl = 0.062 * 26.98
mAl = 1.67 gHope this helps
What is higher boiling point alkyne or alkyl halides??
Answer: alkyl halide
Explanation: brianlist please?
What type of reaction is shown below c10H8+12O2 10co2+4H2O
Answer:
Explanation:
Combustion. Have fun with that.
structure of potassium trioxalatoaluminate(iii)?
Answer:
K3[Al(C2O4)3] is the answer
46 g of glycerin were dissolved in 100 g of water. What is the freezing point of this solution?
Additional information:
М(С3Н5(ОН)3) = 92 g/mol;
Тf(Н2О) = 273.15 К;
Кf = 1.86 kg⋅К/mol.
Based on the formula to determine the freezing point depression of the solvent, the freezing point of the solution is 263.85 K.
What is the freezing point of a substance?
The freezing point of a substance is the temperature at which the liquid changes to solid without any further decrease in temperature occurring during the process.
The addition of solute substances in liquids usually lowers the freezing point of the liquid solvent.
The formula to determine the freezing point depression of solvent is given below:
ΔT = i * Kf * mwhere'
ΔT is the change in freezing point,i is the van't Hoff factor,Kf is the freezing point depression constant, andm is the molality of the solution.The molality of the given solution = moles of solute/kg of solvent
moles of solute = 46/92
mass of solvent = 100 g or 0.1 kg
Molality of solution = (46/92) / 0.1
Molality of solution = 5
for glycerine, i = 1
ΔT = ΔT = 1 * 1.86 * 5
ΔT = 9.3
The freezing point of the solution = 273.15 - 9.3
The freezing point of the solution = 263.85 K
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The interaction of the skeletal and muscular systems to create movement and locomotion is regulated by which organ system?
A. Nervous
B. Respiratory
C. Digestive
D. Immune
Answer: steaks
Explanation:
What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Hg2 concentration is 7.36E-4 M and the Al3 concentration is 1.05 M
Answer:
Explanation:
Concentration of Hg⁺² = 7.36 x 10⁻⁴ M
Concentration of Al⁺³ = 1.05 M
2Al + 3Hg⁺² = 2Al⁺³ + 3Hg .
E = E₀ + RT / nF ln [ Al⁺³]² / [ Hg⁺² ]³
E₀ = reduction potential of Hg⁺² minus reduction potential of Al⁺³
= 0.92 V - ( - 1.66 V )
= 2.58 V
E = 2.58 + .059 /n log [ Al⁺³]² / [ Hg⁺² ]³
n = 6 , [Al⁺³] = 1.05 M ; [Hg⁺²] = 7.36 x 10⁻⁴ M
E = 2.58 + .059 /6 log [ 1.05]² / [ 7.36 x 10⁻⁴ ]³
= 2.58 + .059 /6 log 27.65 x 10⁸ .
= 2.58 + .059 /6 [8+ log 27.65 ].
= 2.58 + .059 /6 [8+ log 27.65 ].
= 2.58 + .09
= 2.67 V .
What's the lewis structure of NO3- and O3?
I end up finding the apparently wrong ones for both, and am probably missing out on an important notion.
The lewis structure of NO₃⁻ is trigonal planar and the Lewis structure of ozone (O₃) has a resonance form.
What are Lewis structures?Lewis structures which are also often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.
NO₃⁻ has a trigonal planar Lewis structure. It has one nitrogen atom, three oxygen atoms, and covalent bonds holding the three oxygen atoms together. The sp² hybridization of the nitrogen atom gives NO₃⁻- its trigonal planar structure.
Three oxygen atoms make up the oxygen allotrope known as ozone (O₃). One double bond and one single bond make up the Lewis structure of ozone. Additionally, two oxygen atoms in the Lewis structure of O3 carry charges.
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Lisa has a glass that has a mass of exactly 100 grams. She puts exactly 45 grams of acid in the glass, and then she adds 15 grams of crushed limestone. When the limestone touches the acid, it makes bubbles. Lisa waits until the reaction stops, and then she weighs the glass and its contents. What should Lisa expect to find about the mass of the glass and its contents when she puts it on a scale?
Answer:
She should expect for the scale to say 145 grams.
Explanation:
Limestone is mostly made up of the mineral calcium carbonate (CaCO3). But if you add an acid, you add hydrogen ions (H+), which will react with the carbonate to form hydrogen carbonate HCO3- ions, which are very soluble in water, and the limestone will dissolve. So, if you add 100+45 you get 145.
use the kinetic particle model to describe the motion and separation of the particles in solid carbon dioxide and carbon dioxide gas
In solid carbon dioxide (dry ice), the particles are held together by strong covalent bonds, so they do not move around much.
What is the carbon dioxide?
Carbon dioxide (CO2) is an odorless, colorless gas created through natural processes such as respiration, combustion and the breakdown of organic materials. As a greenhouse gas, it is a major component of the Earth’s atmosphere and plays a critical role in regulating the global climate. Carbon dioxide is made up of one carbon atom and two oxygen atoms, and is produced when fossil fuels such as coal and oil are burned. Plants and trees also use carbon dioxide as part of their photosynthesis process. Carbon dioxide is essential for life on Earth, however, too much of it can have a negative impact on our planet. As human activity has increased over the past century, so too has our production of CO2, resulting in higher concentrations of this gas in the atmosphere and contributing to global warming.
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What is a solution?
Two solutes mixed together
A solute and solvent mixed together
A solute or solvent by themselves
Two solvents mixed together
oc
d
Answer:
A solute and a solvent mixed together.
Explanation:
A solution is a solute and a solvent mixed together. An example would be salt water. Salt would be the solute (the thing that's getting dissolved) and water would be the solvent (the thing that does the dissolving)
What happens when,
a) Hydrogen gas is bubbled into acidified potassium permanganate solution?
b) Some piece of zinc are added into acidified permanganate solution?
c) Hydrogen gas is bubbled into acidified potassium dichromate solution?
d) Some pieces of zinc are added in acidified potassium dichromate solution?
e) Hydrogen gas is bubbled into acidified ferric chloride solution?
f) Some piece of zinc are added into acidified ferric chloride solution?
Add the required chemical reactions as well
Explanation:
I)reaction between potassium paramagnet with H2 forms MnO2
what is the difference between refference and indicator electrode
Answer:
The key difference between indicator electrode and reference electrode is that indicator electrode responds to changes in the activity of the analyte, whereas reference electrode does not respond to changes, and its response is stable.
Explanation:
Calculate the molarity of the following solution: 1.0 mole of KCI in 750.0 mL of
solution.
99 M
0.750 M
B 2.0 M
1.3 M
1.3 mol ⋅ L − 1
Molarity=
Moles of solute/ Volume of solution
2 attempts len
Check my work
The density of sucrose, table sugar, is 1.56 g/ec. What volume (in cubic centimeters) does 19.0 g of
sucrose occupy?
cc
Answer:
12.18 cc
Explanation:
From the question given above, the following data were obtained:
Density = 1.56 g/cc
Mass = 19 g
Volume =?
The density of a substance can be defined as the mass per unit volume of the substance. Mathematically, it can be expressed as:
Density = mass / volume
With the above formula, we can obtain the volume of the sucrose as follow:
Density = 1.56 g/cc
Mass = 19 g
Volume =?
Density = mass / volume
1.56 = 19 / volume
Cross multiply
1.56 × volume = 19
Divide both side by 1.56
Volume = 19 / 1.56
Volume = 12.18 cc
Therefore, the volume occupied by the sucrose is 12.18 cc
During the electrolysis of molten sodium chloride, which ion discharges at the anode?
Answer:
it should be chlorine gas
Explanation:
How many grams of Fe2O3 can be produced from 180 g Fe ?
Answer:
257.6 grams
Explanation:
first write the formula: 4Fe + 3O2 -> 2Fe2O3
Fe molar mass is 55.8
180/55.8 = 3.226 mols
devide 3.226 by 4, then multiply by 2 which gives us 1.61 mols Fe2O3
Fe2O3 molar mass is 160
1.61 mols * 160 = 257.6 grams
What is the molarity of the solution formed by mixing 0.2 moles of NaOH with enough water to make 0.15 L of solution?
Answer: 0.5
Explanation:
Match each phylum with the correct description
cnidarians
internal skeletons made of hardened plates
echinoderms
radial symmetry and stinging cells
arthropods
jointed body parts and an external skeleton
annelids
segmented body and closed circulatory
system
Answer:
:) Here
Explanation:
The net ionic equation for formation of an aqueous solution of Al(NO3)3 via mixing solid Al(OH)3 and
aqueous nitric acid is
Answer:
Al(OH)3 (s) + 3H+ (aq) → 3H2O (l) + Al3+ (aq)
Explanation:
The net ionic equation for the reaction between solid Al(OH)₃ and aqueous nitric acid, HNO₃ is
3H⁺(aq) + Al(OH)₃ (s) —> 3H₂O(l) + Al³⁺(aq)The reaction between Al(OH)₃ and HNO₃ will proceeds as follow:
HNO₃ (aq) —> H⁺(aq) + NO₃¯(aq)
HNO₃ (aq) + Al(OH)₃ (s) —>
H⁺(aq) + NO₃¯(aq) + Al(OH)₃ (s) —> H₂O(l) + NO₃¯(aq) + Al³⁺(aq)
Cancel the spectator ion (i.e NO₃¯)
H⁺(aq) + Al(OH)₃ (s) —> H₂O(l) + Al³⁺(aq)
Write 3 before H⁺ and H₂O to obtain the balanced ionic equation as shown below:
3H⁺(aq) + Al(OH)₃ (s) —> 3H₂O(l) + Al³⁺(aq)
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3. Silances are more reactive than alkanes. Explain.
The lower bond energy of the silicanes make them more reactive than the alkanes.
What are the silicanes?We know that the members of group four has the ability to catenate and this is a property that characterizes all the elements that we can find in the group. However the extent to which the members of the group can be able to catenate is what we use to determine the stability of the bonds.
The alkanes are composed of the bonds that exist between carbon and hydrogen and the alkanes can be able to form very long chains and this can be used to explain the fact that you can be able to find the alkanes in various kinds of applications.
However, the bond energy of the silicanes is less than that of the alkanes hence they tend to be more reactive then the alkanes.
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10. Which of the following is an example of a
chemical change?
A. burning a scented candle
B. cutting an apple into slices
C. freezing liquid water into an ice cube
D. melting a stick of butter to pour over popcorn
QUESTION 62
Which of the following pH values represents the highest concentration of H30+ ions?
O pH 5.4
O pH 7.0
O pH 8.7
O All of the above have the same concentration of hydronium ions
O cannnot be determined with the given information
Answer:
5.4
Explanation:
The lower the pH the more H3o+ ions there are
PLSSSS HELP Humus is made of ___________? (Select all that apply.)
mineral deposits
bedrock
microorganisms
organic material
inorganic material
insects
Answer
I'm pretty sure it would be (Insects, and microorganisms)
Explanation:
If its not correct I'm sry
Answer:
it would be Insects, and microorganisms
Explanation:
I finished the quiz minute ago
Use the ideal gas law to find the volume that 4.30 mol of oxygen gas occupies at 99.7 kPa and 35.0 °C.
help please
According to the ideal gas law, 4.30 molecule of o2 occupies 0.11 m³ at 99.7 kPa with 35.0 °C.
What is a straightforward definition of ideal gas law?The relationship between a gas's pressure P, volumes V, and t in the range between low pressures and extremely high temperatures, when the gas's water moves virtually independently of one another, is known as the ideal gas, also known as the perfect gas law.
PV = nRTp = pressure in PaV
= volume in m³n = number of molesR
= molar gas constant (8.31 JK⁻¹mol⁻¹)T
= temperature in Kpressure ⇒ 99.7 × 10³ Pa
temperature ⇒ 35.0 + 273 = 308
KpV = nRT
= 99.7×10³×V= 4.30×8.31×308V
=(4.30×8.31×308)/(99.7×10³3 )V
= 0.11 m³
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[H3O+] = 3.6 x 10-2 M
Answer:
om pH
The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH. [H3O+] = 10-pH or [H3O+] = antilog (- pH) Example: What is the hydronium ion concentration in a solution that has a pH of 8.34?
Explanation:
Let us assume that Cd(OH)2(s) is completely insoluble, which signifies that the precipitation reaction with NaOH(aq) (presented in the transition) would go to completion.
Cd2+(aq)+2NaOH(aq) → Cd(OH)2(s)+2Na+(aq)
If you had a 0.300 L solution containing 0.0220 M of Cd2+(aq) , and you wished to add enough 1.25 M NaOH(aq) to precipitate all of the metal, what is the minimum amount of the NaOH(aq) solution you would need to add? Assume that the NaOH(aq) solution is the only source of OH−(aq) for the precipitation.
Answer:
The minimum amount of NaOH(aq) solution needed to add is 0.0560 L. This can be calculated by using the following equation:
Moles of Cd2+ = 0.0220 M x 0.300 L = 0.0066 mol
Moles of NaOH = 0.0066 mol x 2 = 0.0132 mol
Volume of NaOH = 0.0132 mol/1.25 M = 0.0560 L
Explanation:
Which statement correctly describes the melting and boiling points of water?
A) They occur due to electrostatic forces between molecules
B) They are the same temperature.
C) They are 0°F and 100°F, respectively.
D) They both depend on the surface tension of water.
The temperature at which a solid transforms into a liquid at atmospheric pressure is referred to as the liquid’s melting point.
What are the melting and boiling points of water?The fact that water boils at a greater temperature than fluorine makes option C the correct choice. The melting point of water is zero degrees Celsius (32 degrees F). Depending on the atmospheric pressure, different amounts of water will boil at different temperatures. When purified water reaches its boiling point at sea level, it does so at 212 degrees Fahrenheit (100 degrees Celsius).
Compared to fluorine, water has a greater boiling point. Regarding the melting and boiling points of water and fluorine molecules, this statement is accurate.
The temperature at which a substance's solid and liquid phases are in equilibrium is known as its melting point. A temperature at which a substance's vapour pressure reaches its boiling point.
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Statement C; They are 0°F and 100°F, respectively, correctly describes the melting and boiling points of water. But Instead of F it should be degree Celsius.
What is Melting point? The temperature at which a substance changes its state from a solid to a liquid is termed as its melting point. The solid and liquid phases or states are in equilibrium at the melting point. Pressure and temperature affects a substance's melting point, which is typically reported at a standard pressure such 1 atmosphere or 100 kPa.The Melting point of water is 0°C and boiling point is 100°C.To know more about melting point visit
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Antigens are substances that may induce immune response as they are recognised and bound by antibodies or cells of the immune system.
Based on your knowledge of the structures of bacteria and viruses, can you suggest some examples of molecules that are antigenic?
Some examples of molecules that are antigenic may be proteins and or polysaccharides in the cell wall of pathogenic bacteria which may be targeted by the immune system during the production of antibodies.
What is the relationship between antigens in pathogenic bacteria and antibodies of the immune system?The relationship between antigens in pathogenic bacteria and antibodies of the immune system is based on the fact that antigens are biomolecules in the pathogens that can be targeted to bond antibodies that are produced by the organism in immune responses against bacteria, viruses, and allergens in the air and foods, etc.
Therefore, with this data, we can see that antigen molecules be any type of biomolecule present in the pathogen and the relationship between antigens in pathogenic bacteria and antibodies of the immune system is based on the binding between them (antigens and antibodies) which is fundamental during certain specific immune responses.
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Pasagot kailangan Asap
Answer:mmhm
Explanation:
mhhm
Answer:
do u want the answer now?