Answer:
Explanation:
For this reaction we have a Combination reaction. Balancing Strategies: For this reaction it is helpful to start by changing the coefficient in front of H2O and so that you have an even number of oxygen atoms.
Hope this helps. :] If this helped, plz friend me
Answer:
It is a combination reaction.
Explanation:
In this reaction it is helpful to start by changing the coefficient in front of H2O and so that you have an even number of oxygen atoms.
what is the definition of drugs
Answer:
Drugs is a type of medication
Another meaning for it is something that makes you feel drunk such as wine, alcohol and as such that causes addiction.
The equilibrium constant, Kc, is calculated using molar concentrations. For gaseous reactions another form of the equilibrium constant, Kp, is calculated from partial pressures instead of concentrations. These two equilibrium constants are related by the equation Kp=Kc(RT)Δn where R=0.08206 L⋅atm/(K⋅mol), T is the absolute temperature, and Δn is the change in the number of moles of gas (sum moles products - sum moles reactants). For example, consider the reaction N2(g)+3H2(g)⇌2NH3(g) for which Δn=2−(1+3)=−2. Part A For the reaction 2A(g)+3B(g)⇌C(g) Kc = 63.2 at a temperature of 81 ∘C . Calculate the value of Kp. Express your answer numerically.
Answer:
Kp = 1.41 x 10⁻⁶
Explanation:
We have the chemical equation:
2 A(g) + 3 B(g)⇌ C(g)
In which A and B are the reactants and C is the product. We calculate first the change in the number of moles of gas (Δn or dn):
dn= (sum moles products - sum moles reactants)
= (moles C - (moles A + moles B))
= (1 - (2+3))
= 1 - 5
= -4
We have also the following data:
Kc = 63.2
T= 81∘C + 273 = 354 K
R = 0.082 L.atm/K.mol (it is a constant)
Thus, we introduce the data in the mathematical expression for the relation between Kp and Kc:
[tex]Kc = (RT)^{dn}[/tex]= (0.082 L.atm/K.mol x 354 K)⁻⁴ = 1.41 x 10⁻⁶
A__ is two or more substances that are together in the same place but are not chemically ( combined.
Answer:
yeah
Explanation:
Image result for The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
why is weather forecasting important to the people
Answer:
Weather forecasting is important to the people since it helps determine future climate expectations .
0.254g lead(ii)ethanoate, on adding excess K2CrO4 solution, gave 0.130g of lead(ii)chromate precipitate. what is the percentage composition of Pb in the organic salt? (O = 16, Cr = 52, Pb = 207).
Answer:
32.8%
Explanation:
All of the Pb⁺² species precipitated as lead(II) cromate, PbCrO₄ (we know this as excess K₂CrO₄ was used).
First we convert 0.130 g of PbCrO₄ into moles, using its molar mass:
0.130 g ÷ 323 g/mol = 4.02x10⁻⁴ mol PbCrO₄There's 1 Pb⁺² mol per PbCrO₄ mol, so in total 4.02x10⁻⁴ moles of Pb⁺² were in the ethanoate sample.
We convert those 4.02x10⁻⁴ moles of Pb into grams:
4.02x10⁻⁴ mol * 207 g/mol = 0.083 g PbFinally we calculate the percentage composition of Pb:
0.083 g Pb / 0.254 g salt * 100% = 32.8%3x + 4y - 3z) - (2x - 6y + 7z)
x + 10y - 10z
x + 10y - 10z
x -10y - 10z
Answer: x + 10y - 10z is the answer
Explanation:
What is the noble gas configuration of Oganesson?
Answer:
5f14 6d10 7s2 7p6
Explanation:
This is because oganesson is a noble gas and element of group 18 which does not occur or is not produced naturally. It is produced in an experiment. It is a gas at room temperature and it has atomic number of 118. It is harmful and a radioactive gas due to it's radioactive properties and it is produced in small amound
how many grams are there in 3400 moles of tetranitrogen dicarbide?
Explanation:
molar mass of tetranitrogen dicarbide S4N4= 4×32+4×14
128+56
184 g/mol
no.of moles =given mass/ molar mass
3400= given mass / 184
3400×184 =given mass.
625600 g
Diffusion is the movement of water between the cell membrane.
O True
O False
it is true good friend chip chip cherrio
How is science based on observation used as evidence? How can this evidence be used?
15 POINTS AND BRAINLIEST
Answer:
w
Explanation:
Please help me thanks:)
Answer:
where it goes
Explanation:
Answer:
I didn't do the observation that the question said so I can't help sorry
gA scientist is trying to discover information about an unknown metal in a compound. The formula for the compound is believed to be XBr3XBr3 where XX is the unknown metal. The scientist determined that a 4.700 g4.700 g sample of this compound contains 4.834×10−2 mol Br4.834×10−2 mol Br . Calculate the atomic mass of the unknown metal, XX .
Solution :
It is given that :
The formula of the compound = [tex]$XBr_3$[/tex]
And that 4.70 g of the sample contains [tex]$4.834 \times 10^{-2}$[/tex] mol of Br.
It means that :
1 mol of [tex]$XBr_3$[/tex] contains = 3 mol of Br
∴ 3 mol of [tex]$Br^-$[/tex] contain in 1 mol of [tex]$XBr_3$[/tex]
[tex]$4.834 \times 10^{-2}$[/tex] mol of [tex]$Br^-$[/tex] contains [tex]$1.576 \times 10^{-2}$[/tex] mol of [tex]$XBr_3$[/tex]
Thus the mol of [tex]$XBr_3$[/tex] = [tex]$1.576 \times 10^{-2}$[/tex] mol
The given mass is = 4.700 g
Therefore, the [tex]$\text{molar mass}$[/tex] of [tex]$XBr_3$[/tex] [tex]$=\frac{\text{mass}}{\text{mol}}$[/tex]
[tex]$=\frac{4.700 \ g}{1.576 \times 10^{-2} \ mol}$[/tex]
= 298.4 g/mol
So [tex]$\text{molar mass}$[/tex] of [tex]$XBr_3$[/tex] = [tex]$\text{molar mass}$[/tex] of X + 3 x [tex]$\text{molar mass}$[/tex] of Br
298.4 g/mol = [tex]$\text{molar mass}$[/tex] of X + 3 x 79.90 g/mol
298.4 g/mol = [tex]$\text{molar mass}$[/tex] of X + 239.7 g/mol
[tex]$\text{molar mass}$[/tex] of X = 58.71 g/mol (since 1 amu = 1 g/mol)
Therefore the atomic mass of the unknown metal = 58.71 g/mol
So the unknown meta is Nickel.
How many grams of phosphorous is in the human skeleton if its average
weight is 11 kg and contains 58% of calcium phosphate (Ca3(PO4)2)?
What is the boiling point in °C of a 3.6 molal solution of calcium chloride in water?
Answer:
CaCl2--->Ca2+ + 2Cl_ so i=3
Is cheese melting on a hamburger conduction, convection, or radiation?
Answer:
convection
Explanation:
Answer:
Conduction
Explanation:
What is conduction? It is that heat is transferred from one particle of matter to another. It involves contact
Where do most of the visible electromagnetic waves on Earth come from?
Question 3 options:
x-rays
the sun
radio waves
florescent lights
Answer:
the sun
Explanation:
hope this helps. :) brainlyest would be nice as well but it's ok if not, thank you!
Answer: the sun
Explanation:
A 0.00215-g sample of polystyrene, a polymer composed of carbon and hydrogen, produced 0.00726 g of CO2 and 0.00148 g of H2O in a combustion analysis. What is the empirical formula for polystyrene?
Answer:
CH
Explanation:
Polystyrene is composed only by C and H.
We can calculate the number of C moles contained in the original sample mass (0.00215 g), using the produced mass of CO₂:
0.00726 g CO₂ ÷ 44 g/mol = 1.65x10⁻⁴ mol CO₂As 1.65x10⁻⁴ moles of CO₂ were produced, in the polystyrene sample there were 1.65x10⁻⁴ moles of C.
Now we calculate how many moles of H₂O were produced:
0.00148 g H₂O ÷ 18 g/mol = 8.22x10⁻⁵ mol H₂OThe number of H moles produced is double the amount of H₂O moles, so in the polystyrene sample there were 1.64x10⁻⁴ moles of H.
The number of C and H moles are the same, this means the empirical formula is CH.
3. Methyl acetate is hydrolyzed at 25 oC in acidic environment. Aliquots of equal volume are removed and titrated with NaOH solution. The hydrolysis reaction is irreversible. The results are Time/s 339 1242 2745 4546 infinite Volume of base/ mL 26.34 27.80 29.70 31.81 39.81 Write the reaction of hydrolysis of methyl acetate. (3 pts.) Neglect the reverse reaction. Find the order of the hydrolysis reaction and the value of the rate constant at this temperature. (12 pts.) Total 15 pts.
Solution :
Time (sec) Volume of NaOH (mL)
339 26.23
1242 27.80
2745 29.70
4546 3.81
[tex]$\infty$[/tex] 39.81
Now the example of the first order kinetics w.r.t volumetric analysis is :
[tex]$k=\frac{2.303}{t} \log \left(\frac{v_{\infty}-v_0}{v_{\infty}- v_t}\right)$[/tex]
Here, [tex]$v_{\infty}= \text{ volume at }\infty = 39.81$[/tex]
[tex]$v_{t}= \text{ volume at time 't' } = 27.80$[/tex]
[tex]$v_0$[/tex] = volume at time 0 = 0
Since the interval is not constant, we take the time interval as
[tex]$=\frac{903+1503+1801}{3}$[/tex]
[tex]$=\frac{4207}{3}$[/tex]
= 1402.3333
≈ 1402 seconds
[tex]$k=\frac{2.303}{1402} \log \left(\frac{39.81-0}{39.81-27.80}\right)$[/tex]
[tex]$=(0.001643) \log \left(\frac{39.81}{10.01}\right)$[/tex]
= 0.001643 x 0.52045
= 0.00082
[tex]$= 8.55 \times 10^{-4} \ sec^{-1}$[/tex]
Therefore, the first order rate constant is k [tex]$= 8.55 \times 10^{-4} \ sec^{-1}$[/tex].
Hayley woke up to a hot and humid day but knows it is going to cool off later. What should she expect the weather to be like tonight?
Answer:
It will most likely rain because cool air cannot hold as much moisture as warm air.
Explanation:
I did the quiz !! :)
I really hope this helps!!!!!!!!!!!! :)
name this structure
Answer:
The fourth one- bromo trifluoro methane
Explanation:
Answer:
D
Explanation:
I believe the answer is the 4th option, bromo-trifluoro-methane
Thermal energy depends on what two things?
Answer:
temperature and mass
Explanation:
porque
When a solid turns into a liquid what is happening to the relationship between the forces?
You have a container which has the capacity to hold 3 L water. If it already has 2.25 L water in it, how much more water in mL can you still add to fill it completely?
A cell is placed in a salt solution that has the same concentration as the inside of the cell. What will happen to the cell
A. The cell will contract
B. The cell will expand slightly
C. The cell will burst
D. The cell will remain the same size
By the way I had to ask again because I f forgot to put the answer choices
Answer:
B
Explanation:
If not B then its d
Answer:
D
Explanation:
This would be an isotonic solution. If a cell is placed in a solution of salt with the same concentration of salt in the cell, nothing will happen.
Which is not true of the cell theory?
which is NOT true about the cell theory?
A:all living organisms are composed of cells
B:all cells have a nucleus, which acts like the brain of the cell
C:all cells come preexisting living cells
D:the cell is the most basic part of a living organism
B) Which of these is NEVER an example of freshwater? A) Pacific Ocean B) Okefenokee Swamp Mississippi River Lake Pontchartrain.
Answer:
Lake pontchartrain
Explanation:
Four stereoisomers exist for 4-hexen-3-ol. Draw the structure of the isomer that has the Z configuration around the double bond and the R configuration at the chiral center.
Answer:
Following are the solution to the given question:
Explanation:
Please find the complete question and its graph file in the attachment file.
The isomer having Z specification from around dual connector as well as the chiral center S structure is:
[tex](3S,4Z)-4-Hexen-3-ol[/tex]
An 'H' atom has been at the level of 3rd carbon, and we need to change its configuration, through 'R' to 'S' by CIP notation (under contrast to -OH group).
Answer:
The double bond can have either the E or the Z configuration.
Each of these stereoisomers can exist in either the R or the S configuration at the chiral center for a total of four possible stereoisomers.
How does the reactivity of nonmetals change as you move from left to right across the periodic table?
Answer:
Metallic character refers to the level of reactivity of a metal. Non-metallic character relates to the tendency to accept electrons during chemical reactions. Metallic tendency increases going down a group. Non-metallic tendency increases going from left to right across the periodic table.
Explanation:
I hope this helps :)
Answer:
Explanation:
Non metals increases in reactivity!
In the combustion of gasoline, shown below, if 15.0 g of CO2 is produced, what volume of oxygen gas would be consumed? Assume STP. You must show your work.
Answer:
Depends on what you are burning. If it is carbon (ie coal), the answer is 15 (one liter CO2 for each liter of oxygen. Simply add a C onto an O2.) If you are burning octane, (C8H18), for each carbon you would you would have 1 1/8 H2Os and one CO2. To round off slightly (as I do not feel like getting out my calculator) we would have about twice as much oxygen tied up in CO2 as H20 (as there is only one O in H2O vs 2 in CO2). Therefore, in this case, it is ~10 l of CO2 for 15 l of oxygen. Propane will be different again, as will natural gas, etc.
Explanation:
what happened to Jodys
father
Answer:
Jody's father was bitten by a poisonous snakes name rattle snake