Answer:
mass = 266.8 g
Explanation:
mass = no. of moles x molar mass ([tex]M_r[/tex])
[tex]M_r \space\ \space\ of[/tex] [tex]Mg(NO_2)_2[/tex] = 24 + 2[14 + 2(16)]
= 116
∴ mass = 2.3 x 116
= 266.8 g
Draw a heating curve for 1 mole of methanol beginning at 170K and ending at 350K. Assume that the values given here are constant over the relevant temperature ranges.
The graph of the heating of methanol has been attached.
The temperature at 170 K is approximately the melting point of methanol.
The temperature at 350 K is approximately the boiling point of methanol.
If we provide heat before 170 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in solid form.
If we provide heat at 170 K temperature then all the heat provided to the methanol will result in change in physical from of methanol from solid to liquid.
If we provide heat after 170 K temperature and before 350 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in liquid form.
If we provide heat at 340 K temperature then all the heat provided to the methanol will result in change in physical from of methanol from liquid to gas.
If we provide heat after 350 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in gas form.
So, the heat given to methanol will rise its temperature except at its Boiling and melting point. At those temperature heat will change the physical form of methanol first. and the graph also have been attached of between boiling point and melting point as given in question .
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Why is the MO structure of NO+ different than that of N2? (the structure, not the number of electrons)
N2 is a homonuclear molecule and NO+ is a heteronuclear molecular ion hence the MO structure of NO+ different than that of N2.
What is the molecular orbital?The molecular orbital is formed by the combination of atomic orbitals. We should note that the number of molecular orbitals must be equal to the number of combining atomic orbitals.
Now we know that N2 is a homonuclear molecule and NO+ is a heteronuclear molecular ion hence the MO structure of NO+ different than that of N2.
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How can we prevent land pollution?
Answer:
1. Make people aware about the concept of Reduce, Recycle and Reuse.
2. Reduce the use of pesticides and fertilizers in agricultural activities.
3. Avoid buying packages items as they will lead to garbage and end up in landfill site.
4. Ensure that you do not litter on the ground and do proper disposal of garbage.
5. Buy biodegradable products.
6. Do organic gardening and eat organic food that will be grown without the use of pesticides.
7. Create dumping ground away from residential areas.
I hope it helps u
What will the cleaning sanitation and storage of food contact surfaces of equipment and utensils help prevent?
Proper cleaning and sanitizing practices are critical in preventing bacteria that can cause foodborne illness.
Benefits of sanitizing:
Eliminates Pathogens.
Sanitizing Improves Home Odor.
Reduces Respiratory issues.
Decreases Allergy Flare-Ups.
Easy to Use.
Reduces Stress.
Helps the Immune System.
When and how to clean surfaces in your home.
Important to clean and sanitize kitchen premises
Cleaning your kitchen premises and equipment ensures that clean food preparation is carried out in order to improve kitchen efficiency and reduce environmental impacts.
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How much heat is required to change 35.0 g of water from ice to liquid water?
The following information for water is given, but may or may not be useful:
C = 4.184 J/g°C
AHfus = 334 J/g
AHvap=2260J/g
Taking into account the definition of calorimetry and latent heat, 11,690 J is required to change 35 g of water from ice to liquid water.
Definition of calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Definition of sensible heatSensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
Definition of latent heatLatent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q = m×L
where L is called the latent heat of the substance and depends on the type of phase change.
Heat to change water from ice to liquid waterIn this case, you know:
Q= ?m= 35 gL= ΔHfus= 334 [tex]\frac{J}{g}[/tex] because the change consists of changing from a solid (ice) to a liquid phase (liquid water).Replacing in the definition of latent heat:
Q = 35 g× 334 [tex]\frac{J}{g}[/tex]
Solving:
Q= 11,690 J
Finally, 11,690 J is required to change 35 g of water from ice to liquid water.
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A scientist observes that the electrical resistance of a subconducting material drafts to zero when the material is cool to very low temperatures which is the following statements best describes what the scientist is observing
The statement that describes what the scientist is observing is; "the scientist is observing an intensive property of a superconductor."
What is electrical resistance?The term electrical resistance refers to the opposition that is offered to the flow of current. We know that a superconductor is one whose electrical resistance drops to zero when it s cooled to the absolute zero.
Hence, the statement that describes what the scientist is observing is; "the scientist is observing an intensive property of a superconductor."
Missing parts:
A scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled to very low temperatures. Which of the following statements best describes what the scientist is observing?
The scientist is observing the electrical power of a superconductor.
The scientist is observing the temperature of a superconductor.
The scientist is observing an intensive property of a superconductor.
The scientist is observing an extensive property of a superconductor
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what are the rules guiding iupac nomenclature?
Explanation:
Hope it helps you!!How many atoms are present in 8.78 grams O2?
Moles of O_2
Given mass/Molar mass8.78/320.27molNo of atoms
No of moles×Avagadro no0.27×6.023×10²³1.6×10²³atomsNote the formula
[tex]\boxed{\sf No\:of\:atoms=No\:of\:moles\times Avagadro\:no}[/tex]
Find no of moles
[tex]\\ \tt{:}\dashrightarrow \dfrac{8.78g}{32g/mol}[/tex]
[tex]\\ \tt{:}\dashrightarrow 0.27mol[tex]
No of atoms
[tex]\\ \tt{:}\dashrightarrow 0.27\times 6.023\times 10^{23}[/tex]
[tex]\\ \tt{:}\dashrightarrow 1.6\times 10^{23}atoms[/tex]
Write out the recipe and list all the ingredients (including the measures) of your favorite dish.
Explain how the ingredients in this recipe cause one or more of the listed reactions.
The recipe for an omelet are:
Ingredients
1 EggSalt and pepper ( 1 tablespoon )Butter ( 1 tablespoon )Recipe:
Turn on the heat and place a pan on it.Add butter to the pan.Crack the egg and whisk it properly.Add the whisked omelet onto the pan and stir.Add salt and pepper.How to illustrate the information?When we turn on the heat and place the pan, a heat transfer takes place and heat transfers from one body to another.
When we add butter to the pan, then the temperature of the pan was more than that of the butter.
Since the melting point of butter was less than the temperature of the pan, the the melting of butter takes place.
When we add the egg, the evaporation of the liquid present in the egg yolk and the egg white takes place.
These are the chemical reactions depicted.
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A scientist is working with a new kind of quantum dot to
make a dye. He is applying Newton's laws to the
particle, but it seems to be breaking these laws of
physics.
Which action will most likely help the scientist study
the particle's motion?
The action that will most likely help the scientist study the particle's motion is that He needs to use quantum mechanics, not Newtonian mechanics because this is a nanotechnology product.
What is Quantum Mechanics?This refers to the branch of mechanics that has to do with the description of motion and the different concepts of quantization of energy
Hence, we can see that based on the fact that a scientist uses a new quantum dot to make a dye and uses Newton's laws, but he seems to be breaking the laws, so he needs to use quantum mechanics because this is a nanotechnology product.
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It takes 5.4 kJ to vaporize 1.6 moles of substance Z. What is the molar heat of vaporization of substance Z? Give your answer in units of kJ/mol with correct significant figures.
The molar heat of vaporization of substance Z is 3.375 kJ/mol.
Molar heat of vaporization of substance Z
The molar heat of vaporization of substance Z is calculated as follows;
ΔH(vap) = E/n
where;
E is the energy requiredn is number of molesΔH(vap) = 5.4 kJ/1.6
ΔH(vap) = 3.375 kJ/mol
Thus, the molar heat of vaporization of substance Z is 3.375 kJ/mol.
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what are correct statements about all greenhouse gases? check all that apply.
The correct statements about all greenhouse gases include the following:
They interact with wavelengths shorter than IR to produce IR. Their absorption spectra will show absorbance in the 400-700 nm region. What is greenhouse gas?These are gases which are found in the atmosphere and have varying effects on the energy present on earth.
Examples include carbon dioxide, methane etc and their characteristics are mentioned above.
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hat is used and produced in glycoloysis?
1.
2 Pyruvate
2.
2 ATP
a
3.
H2O
4.
4 ATP
5.
2 NADH
b
6.
glucose
a.
produced
b.
used
During glycolysis is used glucose, ADP and pyruvate and produce ATP, water and NADH.
What is glycolysis?Glycolysis is the first step of cellular respiration by which glucose is used to generate energy in the form of ATP.
Cellular respiration has three sequential steps, i.e., glycolysis, the Krebs cycle and oxidative phosphorylation.
Glycolysis is the cellular respiration step that generates 2 net high energy ATP molecules and 2 reduced NADH.
In conclusion, glycolysis uses glucose, pyruvate and ADP to generate ATP, water and Nicotinamide adenine dinucleotides (NADH).
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How many formula units are in 239.2g of
Br2
MgCl2
H2O
Fe
The formula units in the substances are as follows:
Br2 = 8.99 × 10^23 formula unitsMgCl2 = 1.51 × 10^24 formula unitsH2O = 2.57 × 10^24 formula unitsFe = 2.57 × 10^24 formula unitsHow many moles are in 239.2 g of the given substances?The moles of the substances are determined from their molar mass.
Molar mass of the substances is given as follows:
Br2 = 160 g/molMgCl2 = 95 g/molH2O = 18 g/molFe = 56 g/molFormula units = mass/molar mass × 6.02 × 10^23
The formula units in the substances are as follows:
Br2 = 239.2/160 × 6.02 × 10^23 = 8.99 × 10^23 formula unitsMgCl2 = 239.2/95 × 6.02 × 10^23 = 1.51 × 10^24 formula unitsH2O = 239.2/18 × 6.02 × 10^23 = 2.57 × 10^24 formula unitsFe = 239.2/56 × 6.02 × 10^23 = 2.57 × 10^24 formula unitsIn conclusion, the number of formula units is derived from the moles and Avogadro number.
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what are the relevant equations for oxidation and reduction
Answer:
There are many equations for oxidation and reduction, but the most relevant ones are the equations for the half-reactions. In general, the equation for oxidation is:
Oxidation: Reducing Agent + O2 → Oxidizing Agent
And the equation for reduction is:
Reduction: Oxidizing Agent + e- → Reducing Agent
These equations show the transfer of electrons that occurs during oxidation and reduction.
Explanation:
What’s the correct answer answer asap for brainlist
What is the conjugate base of CO3-2
The conjugate base of CO3-2 is hydrogen carbonate.
Meaning of Conjugate baseA conjugate base can be defined as a base that can be derived from another base by the reason of it loosing or gaining an electron.
Conjugate base are very similar because they both posses the same elements.
In conclusion, The conjugate base of CO3-2 is hydrogen carbonate.
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4. It is desired to prepare 0.5 L of a 0.1 M solution of NaCl
from a 1 M stock solution. How many milliliters of the
stock solution must be taken for the dilution?
5. Calculate the osmotic pressure of a 0.5 M sucrose
solution if the temperature is 298 K.
4) 0.05 L of the stock solution must be taken.
5) The osmotic pressure would be 12.23 atm
Miscellaneous calculations
4) Using the dilution equation: m1v1=m2v2
m1 = 1M, m2 = 0.1M, v2 = 0.5L
v1 = m2v2/m1 = 0.1 x 0.5/1 = 0.05 L
5) Using the formula: osmotic pressure = icRT
Since sucrose does not ionize in water, i = 1
C = 0.5
R = 0.0821
T = 298
Osmotic pressure = 1 x 0.5 x 0.0821 x 298 = 12.23 atm
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4Al(s) + 30₂(g) → 2Al2O3 (s)
How many molecules of O₂ are used in the reaction?
How many oxygen atoms are required?
How many moles of Al2O3 are formed?
What is the mole ratio of Al to O₂?
how does resistance change with temperature? is there more resistance or less resistance at higher temperatures?
The resistance has a linear relationship with temperature because it increases as temperatures increases.
What is temperature?Temperature refers to the activity (motion or thermal energy) in the atoms that form molecules.
The resistance of an electric conductor increases as the temperature increases since the thermal energy of subatomic electrons also increases.
In conclusion, the resistance has a linear relationship with temperature because it increases as temperatures increases.
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how do biotic components interact with abiotic components? explain with example.
Answer:
An ecosystem is defined by the interactions between the living and non-living things in any given area. Abiotic factors are the non-living components of an ecosystem. These include: air water, wind, soil, temperature, sunlight. One of the most critical interactions in an ecosystem between the biotic and abiotic environment is photosynthesis , the base chemical reaction that drives most life on earth. Plants and algae use sunlight, water and carbon dioxide to create the energy they need to grow and live via photosynthesis.
There are four main types of species interactions that occur between organisms in an ecosystem:
Predation , parasitism and herbivory – In these interactions, one organism benefits while the other is negatively affected.
* Competition – Both organisms are negatively affected in some way due to their interactions.
* Commensalism – One organism benefits while the other is neither harmed nor gains.
* Mutualism – Both organisms benefit from their interactions.
Plants with bird or butterfly pollinators are good examples of mutualistic interactions. Plants benefit by having their flowers pollinated so they can reproduce.
The sparse area surrounding a spiral galaxy is called its
Answer:
Halo
Explanation:
Place a check mark next to each star that is only fusing hydrogen into helium at this time.
Answer:
star 3
Explanation:
the color determines the fusion in between
5pts. Chemistry multiple choice
Answer:
C. Xenon
Explanation:
The question only requires you to use your visual skills to identify the unknown gas. Look at the spectra of unknown gas and xenon, are they not identical? SInce they are same, the unknown sample must be xenon.
Please help iggghghbvvv
A) Y because the line is flat, not going up or down. So, constant or no change in population
B) A positive correlation with introduction to animal A (because population is going up or increasing)
C)
1.New predator (due to Animal A eating them, meaning more of their predators are eating them)
2. Lack of food or food availability due to competition (from Animal A, e.g. if they eat the same food)
3. Introduction to a new disease (from Animal A)
Hope this helps!
Which of the following has eight valence electrons?
o ti4+
CI
Na+
O Kr
O all of the above
Answer:
all of the above
Vehicle air bags require that a very specific amount of gas is created so that the gas inflates the airbag without causing it to rupture.
Commonly, this is accomplished by decomposing sodium azide (NaN3) to produce sodium metal and nitrogen gas. How much sodium azide is required to produce 80.0 g of nitrogen gas?
The amount of sodium azide required will be 123.72 grams
Stoichiometric problemFrom the equation of the reaction below:
[tex]2NaN_3 --- > 2Na + 3N_2[/tex]
The mole ratio of sodium azide to nitrogen gas is 2:3
Mole of 80.0 g nitrogen = 80/28.02 = 2.855 moles
Equivalent mole of sodium azide = 2/3 x 2.855 = 1.903 moles
Mass of 1.903 moles sodium azide = 1.903 x 65 = 123.72 grams
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What is Lewis symbol for K+
Lewis symbol for K+ is given by a dot and K.
Meaning of Lewis symbolLewis symbols can be defined as a symbol the is used in describing the valence electron configurations of an atom ions.
A Lewis symbol consists of the symbol of the element and then surrounded by one dot for each of its valence electrons.
In conclusion, Lewis symbol for K+ is given by a dot and K.
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How many kilograms of NH3 are needed to produce 120 of pf3 if the reaction has 78.1% yield.
99.25 grams = .09925 Kg of fluorine gas is needed.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Balanced chemical reaction: P₄ (s) + 6F₂ (g) → 4PF₃ (g).
m(PF₃) = 120.0 g; mass of phosphorus trifluoride.
n(PF₃) = m(PF₃) ÷ M(PF₃).
n(PF₃) = 120 g ÷ 88 g/mol.
n(PF₃) = 1.36 mol.
From chemical reaction: n(PF₃) : n(F₂) = 4 : 6 (2 : 3).
n(F₂) = 1.36 mol · 3 / 2.
n(F₂) = 2.04 mol; amount of substance.
m(F₂) = n(F₂) · M(F₂).
m(F₂) = 2.04 mol · 38 g/mol.
m(F₂) = 77.52 g ÷ 0.781.
m(F₂) = 99.25 g.
Hence, 99.25 grams = .09925 Kg of fluorine gas is needed.
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60.0 kL of hydrogen at SATP (24.8 L/mol) is reacted with excess amount of nitrogen. The resulting
ammonia gas needs to be stored in a gas tank with a volume of 6.25 kL and under 2000 kPa of pressure.
What should the temperature regulator of the gas tank be set at?
The temperature regulator of the gas tank be set at 842.64 K
What volume of ammonia gas is produced by reacting 60.kL of hydrogen with excess nitrogen at SATP?The volume of hydrogen ammonia produced is given by the mole ratio of the gases in the equation below:
3 H₂ + N₂ → 2 NH₃
The mole ratio is 2:3
Volume of ammonia produced = 2/3 * 60 kL = 40 kL
The temperature regulator value is determined using the general gas equation:
P₁V₁/T₁ = P₂V₂/T₂T₂ = P₂V₂T₁/P₁V₁
P₂ = 2000 kPaV₂ = 6.25 kLT₁ = 273.15 KP₁ = 101.3 kPaV₁ = 40 kLT₂ = (2000 * 6.25 * 273.15)/(101.3 * 40)
T₂ = 842.64 K
The temperature regulator of the gas tank be set at 842.64 K
In conclusion, the general gas equation is useful in determining gas volume, pressure and temperatures.
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