Answer:
Solution. So, the empirical formula of the compound is NH2.
Explanation:
thank me later
Answer:
I don't know but I have to answer cause this is the step
Explanation:
which class do u read its so hard i read in only class6
1.. A saturatedsolutionA.contains more solute thansolvent.B.contains more solvent thansolute.C.contains equal moles of solute andsolvent.D.contains the maximum amount of solute that will dissolve in that solvent at that temperature.E.contains a solvent with only sigma bonds and no pi bonds (i.e. only single bonds, with no doubleor triplebonds).
Answer:
D. contains the maximum amount of solute that will dissolve in that solvent at that temperature.
Explanation:
Solubility is a term used to describe how readily a substance can be dissolved in a solvent to form a solution. Thus, a substance is said to be soluble if it dissolves completely in a solvent and insoluble if it doesn't dissolve or only dissolves partially.
For example, sodium chloride (NaCl) when mixed with water dissociates into sodium and chloride ions. Thus, salt (sodium chloride) is said to be soluble because it dissolves completely in water.
Hence, a compound that dissolves in water to produce an aqueous solution is said to be soluble in water. Also, the solute of an aqueous solution that conducts electricity is called an electrolyte.
In Chemistry, dissolution can be defined as the process of dissolving or dissociating a solute in solid, liquid or gaseous phase into fragmented particles by a solvent in order to form a solution. For dissolution to occur in solids, the crystalline structure of the substance must be broken up so as to release ions, atoms or molecules to produce a solution. For liquid and gases, the substance to be dissolved must form a non-covalent bond with the solvent to produce a solution.
Generally, a saturated solution contains the maximum amount of solute that will dissolve in that solvent at that temperature.
Isoniazid is used in the treatment of tuberculosis and multiple sclerosis. Identify each lone pair as either localized or delocalized. Justify your answer in each case.
Answer:
Please find the complete question and its solution in the attached file:
Explanation:
15. Objects can have kinetic energy, potential energy, or both. Energy can be in the form of motion. Energy can
also be stored by objects in various ways, including position, chemical bonds, or physical state.
Which statement is true? And why?
a. An object’s mass has no effect on its potential energy.
b. Potential energy is converted to kinetic energy as a stationary object begins to move.
c. Kinetic energy is converted to potential energy as a stationary object begins to move.
d. A stretched rubber band stores no energy.
Answer: b because Potential energy is converted to kinetic energy as a stationary object begins to move.
Explanation:
1. How many grams of water are in a cup containing
0.1 moles of H2O?
Answer:
Explanation:
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A sample of aluminum requires 341 J of energy to raise the temperature from 18.0ºC to 55.0ºC. Calculate the mass of the aluminum sample.
Answer:
10.22g
Explanation:
Using the formula as follows:
Q = m × c × ∆T
Where;
Q = amount of heat required (J)
m = mass of substance (g)
c = specific heat of substance (J/g°C)
∆T = change in temperature (°C)
According to the information given in this question;
Q = 341J
m = ?
∆T = 55.0ºC - 18.0ºC = 37°C
c of aluminum = 0.902J/g°C
Using Q = m × c × ∆T
341 = m × 0.902 × 37
341 = 33.374m
m = 341 ÷ 33.374
m = 10.22g
overfishing causes the yellow perch population in this food
web to decrease,
Otter
Osprey
Terrapin
Blue
crab
Algae
Snail
Yellow
perch
Shrimp
Cord grass
Which population is most likely to increase as a result?
A. Otter
The population likely to increase as a result is otter.
Option B is correct.
what is population?Population is described as the term typically used to refer to the number of people in a single area.
When the yellow perch population decreases, there is a decrease in predation pressure on the otter population which means that there are fewer yellow perch preying on the otters, which could lead to an increase in the otter population.
An organism population is described by characteristics that include: population size and the population density.
Learn more about population at:
https://brainly.com/question/29885712
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Please help!
When a 200.0 g block of iron is placed into 1500.0 g of water, the temperature of the iron increases by 50.0 °C. The specific heat of iron is 0.449 J/g^ C . What is the temperature change of the water? (0.715 C)
Thank you!
Answer:
[tex]\Delta T_{w}=-0.715\°C[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible to realize that the heat relationship between iron and water is given by:
[tex]-Q_{Fe}=Q_{w}[/tex]
Which in terms of mass, specific heat and temperature is:
[tex]-m_{Fe}C_{Fe}\Delta T_{Fe}=m_{w}C_{w}\Delta T_{w}[/tex]
Thus, by solving for the change in the temperature of water we will obtain:
[tex]\Delta T_{w}=\frac{-m_{Fe}C_{Fe}\Delta T_{Fe}}{m_{w}C_{w}} \\\\\Delta T_{w}=\frac{-200.0g*0.449\frac{J}{g\°C} 50.0\°C}{1500.0g4.184\frac{J}{g\°C}} \\\\\Delta T_{w}=-0.715\°C[/tex]
Which is negative because iron increases its temperature and therefore water decreases it.
Regards!
what is the part of the earth that is made up of the crust and upper mantle
The crust + upper mantle is called the lithosphere.
A student determines that the theoretical yield of CaCO3, from a precipitation reaction is 21.5 grams
However, this student only recovers 19.9 grams of precipitate through filtration of the solution.
What would be this student's percent yield?
A. 92.6%
B. 0.93%
C. 108%
D. 85.6%
Answer:
92.6
Explanation:
А is a living thing that eats other dead things.
Answer:
Scavengers
Explanation:
In which phase of wound healing is fibrin most involved?
Answer:
Finally, coagulation occurs and reinforces the platelet plug with threads of fibrin which are like a molecular binding agent. The hemostasis stage of wound healing happens very quickly.
Explanation:
Hope it helps u
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How much potassium chloride is needed to make 0.500 m solution with 1.50 L of water?
Answer:
55.9 g KCl.
Explanation:
Hello there!
In this case, according to the definition of molality for the 0.500-molar solution, we need to divide the moles of solute (potassium chloride) over the kilograms of solvent as shown below:
[tex]m=\frac{mol}{kilograms}[/tex]
Thus, solving for the moles of solute, we obtain:
[tex]mol=m*kilograms[/tex]
Since the density of water is 1 kg/L, we obtain the following moles:
[tex]mol=0.500mol/kg*1.50kg\\\\mol=0.75mol[/tex]
Next, since the molar mass of KCl is 74.5513 g/mol, the mass would be:
[tex]0.75mol*\frac{74.5513g}{1mol}\\\\55.9g \ KCl[/tex]
Regards!
The exact mechanism of this reaction is a little complicated, as it involves the copper ions. However, the process involves the formation of small amounts of bromine in situ. Draw the mechanism of the bromination of 4-tert-butyl phenol with Br2. -g
Answer:
see picture below
Explanation:
The mechanism is in the following picture.
In the first step, the lone pair of oxygen (from the OH) as it's a strong activating group in the molecule, will go to the ring. This will cause that the double bond of the ring of the ortho position, attacks as nucleophyle to the Br2, causing the breaking of the bond.
In the second step, the bromine ion substract the hydrogen from the ortho position, and then, by resonance, the pair of electrons returns to the oxygen of the phenol.
Question 5 (5 points)
Complete the following sentences:
a)
is the least reactive alkall metal.
b)
is the most reactive alkali metal.
is the least reactive alkaline earth metal.
d)
is the most reactive alkaline earth metal.
e)
is the most reactive halogen
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Question 6.12
Food Science is the study of the physical, biological, and chemical makeup of food; the
causes of food deterioration; and the concepts ulderlying food processing.
True
False
Mercury: Mineral or Not Mineral? Mineral Not Mineral
Answer:
not a mineral but is a “mineraloid
Explanation:
not mineral
Explanation: its an element but it is not a mineral
A 1 liter solution contains 0.383 M hydrofluoric acid and 0.510 M potassium fluoride.
Addition of 0.096 moles of calcium hydroxide will:
(Assume that the volume does not change upon the addition of calcium hydroxide.)
Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
Answer:
Lower the pH slightly
Explanation:
The mixture of HF, hydrofluoric acid and KF, potassium fluoride produce a buffer that is defined for the equilibrium:
HF(aq) → H⁺(aq) + F⁻(aq)
The buffer can maintain the pH of a solution despite the addition of strong bases or acids.
The reaction of HF with Ca(OH)2 is:
2HF + Ca(OH)2 → 2H2O + CaF2
That means the calcium hydroxide is decreasing the concentration of HF. Based on the equilibrium, the H+ and F- ions will decrease in order to produce more HF. As H+ is decreasing due the equilibrium and not for the addition of a strong base, the pH is decreasing slightly.
Magnesium hydroxide and sodium hydroxide are both strong bases. The pH of a saturated solution of sodium hydroxide is greater than 14. The pH of a saturated
solution of magnesium hydroxide is about 10.2. Why do the solutions have different pH values?
Answer: Solubility of NaOH is greater and there are more OH- ions in solution.
Explanation: Reactions : NaOH (s) ⇒ Na+ (aq) + OH- (aq)
Mg(OH)2 (s) ⇒ Mg2+ (aq) + 2 OH-(aq)
Although in same amount of moles, Mg(OH)2 produces
two (OH-)-ions in water solution, solubility of Mq(OH)2 is smaller.
Concentration [OH-]ions is smaller in saturated water solution
of Mg(OH)2
How many moles of sodium hydroxide would have to be added to 150 mL of a 0.483 M acetic acid solution, in order to prepare a buffer with a pH of 4.480
Answer:
0.068 moles of sodium hydroxide would have to be added to 150 mL of a 0.483 M acetic acid solution
Explanation:
As we know
pH = pKa + log [salt]/[acid]
4.480= 4.74 + log [salt]/[acid]
log [salt]/[]acid] = -0.06
[salt]/[acid] = 0.87
moles acid = 0.150 L x 0.483 mol/L = 0.07245 moles acid
x/0.07245-x = 0.87
X- 0.07245 X = 0.87 *0.07245
X = 0.068 moles
What number should be written in front of Na to balance the equation?
Na + MgCl2 → NaCl + Mg
1
2
3
4
In order to balance the chemical equation, the coefficient of Na should be 2.
Suppose the available nutrients in the soil of an ecosystem decrease. Over time, which adaptation is MOST LIKELY to evolve among the plants that survive there?
Answer:
Root system will become larger or extend farther
Explanation:
If nutrient in soil decrease, the plant's roots system will likely become larger and extend out deeper and farther to get all the nutrients it possibly can
What do greenhouse gases do on Earth?
Answer:
It holds heat from the sun close to Earth.
Explanation:
Hope this helps and have a great day. :)
The specific heat capacity of liquid water is 4.18 J/g oC. Calculate the quantity of energy required to heat 1.50 g of water from 26.5oC to 83.7oC. (Ignore significant figures for this problem.)
Answer: The quantity of heat required is 358.644 J.
Explanation:
Given: Specific heat capacity = [tex]4.18 J/g^{o}C[/tex]
Mass = 1.50 g
[tex]T_{1} = 26.5^{o}C[/tex]
[tex]T_{2} = 83.7^{o}C[/tex]
Formula used to calculate heat energy is as follows.
[tex]q = m \times C \times (T_{2} - T_{1})[/tex]
where,
q = heat energy
m = mass
C = specific heat capacity
[tex]T_{1}[/tex] = initial temperature
[tex]T_{2}[/tex] = final temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times (T_{2} - T_{1})\\= 1.50 \times 4.18 J/g^{o}C \times (83.7 - 26.5)^{o}C\\= 358.644 J[/tex]
Thus, we can conclude that quantity of heat required is 358.644 J.
Which substance is a reducing agent?
A. CO
B. F2
C. CO2
D. H2O2
E. FeSO4
H2O2
[tex] \mathtt \red{Hope \: it \: helps}[/tex]
Solid mercury(II) oxide decomposes into liquid mercury and oxygen gas upon the absorption of 90.8 kJ for each mole of mercury(II) oxide decomposed.
The question is incomplete, the complete question is;
Solid mercury (II) oxide decomposes into liquid mercury and oxygen gas upon the absorption of 90.8 kJ for each mole of mercury (II) oxide decomposed.
What is the reaction without the energy?
What is the appropriate side of the equation and value for the energy term?
Answer:
See Explanation
Explanation:
The equation of the reaction is;
2HgO(s) ==> 2Hg(l) + O2(g)
Let us recall that a chemical equation is balanced if the number of atoms of each element on both sides of the reaction equation are the same. There are two atoms each of mercury and oxygen on both sides of the reaction equation hence the equation is balanced.
In order to write a thermochemical equation, the heat of reaction is written on the right hand side of the reaction equation after writing the products as follows;
2HgO(s) ==> 2Hg(l) + O2(g) ΔH = +90.8 kJ
Find the mass of copper that was
heated from 32°C to 130°C by using
5400 joules of heat. Cou=.385 J/goC
Answer:
143.12 g
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T₁) = 32 °C
Final temperature (T₂) = 130 °C
Heat (Q) = 5400 J
Specific heat capacity (C) = 0.385 J/gºC
Mass (M) =?
Next, we shall determine the change in temperature of copper. This can be obtained as follow:
Initial temperature (T₁) = 32 °C
Final temperature (T₂) = 130 °C
Change in temperature (ΔT) =?
ΔT = T₂ – T₁
ΔT = 130 – 32
ΔT = 98 °C
Finally, we shall determine the mass of copper. This can be obtained as follow:
Change in temperature (ΔT) = 98 °C
Heat (Q) = 5400 J
Specific heat capacity (C) = 0.385 J/gºC
Mass (M) =?
Q = MCΔT
5400 = M × 0.385 × 98
5400 = M × 37.73
Divide both side by 37.73
M = 5400 / 37.73
M = 143.12 g
Therefore, the mass of copper is 143.12 g
What is the name of this compound?
OCH3CCH2 CH3
Octane (C8H18) is found in gasoline. It is burned for fuel in a combustion
reaction. The unbalanced combustion reaction for octane is shown below.
C8h18+ O2 → C02 + H2O + heat
When the reaction is balanced, how many carbon dioxide molecules are
produced for every octane molecule burned?
Answer:
Explanation:
It's 8
give an example of a primary income from the rest of the world
Answer:
(1) Income Associated with the Production Process
(a) Compensation of employees
(b) Taxes and subsidies on products and
production .
(2) Property Income
(a) Investment income:
• Dividends and withdrawals from income of
quasi-corporations
• Reinvested earnings
• Interest
(b) Rent .
I hope this is correct :-)
Give the ratio that balances out the following equation: ___Cr + ___Pb(NO3)4 ---> ___ Cr(NO3)3 + ____ Pb
Answer: Ratio : 4, 3, 4, 3 are the answers.
Explanation: