Answer:
e
Explanation:
Provided the reaction that leads to the formation of the products can proceed in both forward and backward directions, the correct answer would be yes because the reaction will proceed backward until equilibrium is reached.
For a reaction that can proceed both forward and backward, the addition of a catalyst increases the rate of reaction in both directions based on the fact that a catalyst cannot alter the equilibrium of a reaction.
Hence, if an enzyme is added to the product of a reaction that has the potential to proceed in both forward and reverse reactions, a substrate would be expected to form because the reaction will proceed backward until an equilibrium is reached.
The correct option is e.
How is safety achieved during scientific investigations?
Answer investment
Explanation: you have to have saftey while you still do science
HELP! pH = -log10[H+]. If pH 3.5 what is [H+]?
A student measures the molar solubility of iron(II) carbonate, FeCO3, in a water solution to be 6.06 × 10-6 M. Based on her data, the solubility product constant for this compound is:______.
a. 8.90 × 10-27
b. 1.21 × 10-5
c. 3.67 × 10-11
d. 1.06 ×10-25
e. 8.17 × 10-27
Answer:
The correct answer is c. 3.67 × 10⁻¹¹
Explanation:
The dissociation equilibrium and ICE table for FeCO₃ is the following:
FeCO₃ (s) ⇄ Fe²⁺(aq) + CO₃²⁻(aq)
I 0 0
C +s +s
E s s
At equilibrium, the solubility product contant (Ksp) expression will be:
Ksp= [Fe²⁺] x [CO₃²⁻]= s x s = s²
Given: s= 6.06 x 10⁻⁶ M, we calculate Ksp as follows:
Ksp= s²= (6.06 x 10⁻⁶ M)²= 3.67 x 10⁻¹¹
Thus, from the given options the correct is c. 3.67 × 10⁻¹¹
what subatomic particles are found in the nucleus of an atom
Answer:
Explanation:
The subatomic particles of protons and neutrons are found in the nucleus of an atom. Protons are particles with a positive charge, while neutrons have no charge. Electrons, which have a negative charge, are particles that can found orbiting outside the nucleus of an atom.
Answer: protons and neutrons
Explanation:
What is the empirical formula of a hydrocarbon if complete combustion or 2.900 mg of the hydrocarbon produced 9.803 mg of CO2 and 2.006 mg of H2O? Be sure to write C first in the formula.
Answer:
The empirical formula of the hydrocarbon is CH.
Explanation:
The following data were obtained from the question:
Mass of hydrocarbon = 2.9 mg
Mass of CO2 = 9.803 mg
Mass of H2O = 2.006 mg
Next, we shall determine the mass of carbon (C) and hydrogen (H) in the compound since hydrocarbon contains carbon and hydrogen only.
This is illustrated below:
Molar mass of CO2 = 12 + (16x2) = 12 + 32 = 44 g/mol
Mass of CO2 = 9.803 mg
Mass of C in the compound =?
Mass of C in the compound =
12/44 x 9.803
= 2.674 mg
Molar mass of H2O = (2x1) + 16 = 2 + 16 = 18 g/mol
Mass of H2O = 2.006 mg
Mass of H in the compound =
2/18 x 2.006
= 0.223 mg
Finally, we shall determine the empirical formula of the hydrocarbon as follow:
Carbon (C) = 2.674 mg
Hydrogen (H) = 0.223 mg
Divide by their molar mass
C = 2.674 /12 = 0.223
H = 0.223 / 1 = 0.223
Divide both side by the the smallest
C = 0.223/0.223 = 1
H = 0.223/0.223 = 1
Therefore, the empirical formula of the hydrocarbon is CH.
Explain why animals that come out at night have lots of rods in their retina
Answer:
Nocturnal animals, such as owls, tend to have wide pupils and several rod cells in their retina because wide pupil allow more light to enter the eyes and the rods cells in the retina are sensitive to dim light and are vital for night vision.
What do all living things need to survive?
Answer:
air,water,and food.
Explanation:
Some animals need to obtain their energy from plants.
Calculate the cell potential, the equilibrium constant, and the free energy change for
Ba(s)+Mn2+(aq,1M)→Ba2+(aq,1M)+Mn(s)
Given the following E degree values:
Ba2+(aq)+2e→Ba(s), E degree=−2.90V
Mn2+(aq)+2e→Mn(s),E degree=0.80V
Answer:
Explanation:
Ba(s) + Mn²⁺ (aq,1M) → Ba²⁺ (aq,1M) + Mn(s)
Ba⁺²(aq) +2e → Ba(s) , E° = −2.90 V
Mn⁺²(aq) +2e → Mn(s), E⁰ =0.80 V
Anode reaction :
Ba(s) → Ba⁺²(aq) +2e E° = −2.90 V
Cathode reaction :
Mn⁺²(aq) +2e → Mn(s) E⁰ =0.80 V
Cell potential = Ecathode - Eanode
Ecell = .80 - ( - 2.90 )
Ecell = 3.7 V .
equilibrium constant ( K ) :
Ecell = .059 log K / n
n = 2
3.7 = .059 log K / 2
log K = 125.42
K = 2.63 x 10¹²⁵ .
Free energy change :
ΔG = - n F Ecell
= - 2 x 96500 x 3.7
= 714100 J
= 7.141 x 10⁵ J .
How many mg does a 643 kg sample contain?
Answer:
[tex]6.43x19^8mg[/tex]
Explanation:
Hello,
In this case, this unit conversion is performed by knowing that 1 kg of mass contains 1000 g and 1 g contains 1000 mg, therefore, the result is:
[tex]643kg*\frac{1000g}{1kg} *\frac{1000mg}{1g}\\ \\=6.43x10^8mg[/tex]
Regards.
write the name of this structure
Answer:
The name of the compound is:
4–bromo–5,5–dichloro–hex–3–ene–1–yne
Explanation:
To the above compound, we simply do the following:
1. Identify the functional group of the compound.
2. Locate the longest continuous carbon chain. This gives the parent name of the compound.
3. Identify the substituent group attached.
4. Give the substituents the lowest possible count alphabetically.
5. Combine the above to obtain the name of the compound.
Now, we shall determine the name of the compound as follow:
1. The compound has carbon to carbon triple bond (C≡C) yne and carbon to carbon double bond (C=C) ene.
2. The longest continuous carbon chain is 6 i.e hexane.
3. The substituents group attached are:
i. Bromine (bromo), Br
ii. Chlorine (Chloro), Cl
4. In counting, ene comes before yne. But in this case, ene assumes same position from either side, So we shall consider counting from the side that gives yne the lowest count. Thus, ene is at carbon 3 and yne is at carbon 1. Therefore,
i. Bromo, Br is at carbon 4.
ii. Chloro, Cl appears twice and both are at carbon 5.
5. The name of the compound is:
4–bromo–5,5–dichloro–hex–3–ene–1–yne.
The energy produced when nucleons fuse together is called the: Select the correct answer below:
a. strong nuclear force
b. nuclear fusion energy
c. nuclear binding energy
d. none of the above
Answer:
Option C (nuclear binding energy) is the appropriate choice.
Explanation:
At either the nuclear scale, the nuclear binding energy seems to be the energy needed to remove and replace a structure of the atom itself into the characterize elements (to counteract the intense nuclear arsenal). Nuclear warheads (bargaining power) bind everything together neutrons as well as protons within an elementary particle.Some other options in question aren't relevant to the particular instance. So that the option preceding will also be the right one.
What is the mass of sodium thiosulphate pentahydrate required to prepare 250cm3 of a 0.14mol/dm3 solution
Answer:
Strength of the sodium thiosulphate solution to be produced is 0.150M= 0.150mol/L×248.2g/mol=37.23g/L. So 1L or 1000 mL solution ...
Missing: 0.14mol/dm3 | Must include: 0.14mol/dm3
Answer:
Mass = 8.68g
Explanation:
Mass = Concentration × Molar mass × Volume (in dm^3)
but, concentration = 0.14 mol/dm^3.
volume = 250 cm^3 = 0.25 dm^3.
Molar mass of Na2S2O3 . 5H2O
= (2×23)+(2×32)+(3×16)+(5×18)
= 248 g/mol
hence, mass = 0.14 × 248 × 0.25
Mass = 8.68 g.
I HOPE IT'S OK?
Using her new telescope Ashley discovers a spherical meteor passing between the earth and the moon and measures it’s radius as 3 kilometers how many cubic kilometers are in the meteor
Answer:
113 km³
Explanation:
Step 1: Given data
Radius of the meteor (r): 3 km
Step 2: Calculate the volume (V) of the meteor
The meteor is spherical. Given the radius (r), we can calculate the volume of a sphere using the following expression.
V = 4/3 × π × r³
V = 4/3 × π × (3 km)³
V = 4/3 × π × 27 km³
V = 113 km³
The volume of the meteor is 113 km³.
A reaction occurs via the following sequence of elementary steps. What is the reaction intermediate?
1st step: A + 2B → 2C
2nd step: 2C → D
Answer:
C is the reaction intermediate.
Explanation:
A reaction intermediate is a molecular structure that is formed during the reaction but then is converted in the final products.
Usually, these reaction intermediates are unestable and, for that reason, the lifetime of these structures is low.
In the reaction, you can see in the first step C is produced, but also, in the second step reacts producing D. As is produced and, immediately consumed,
C is the reaction intermediate.Sulphuric acid decomposes into H2O and SO3. H2SO4(l)⟶H2O(g)+SO3(g) If 10.0 g of sulphuric acid is completely decomposed in a closed container with a total volume of 3.00 L and no air at 350∘C, what will the total pressure in the container be in atmospheres? Assume the volume of the liquid is negligible. Answer should have three significant figures.
Answer:
3.48 atm
Explanation:
The first step is to determine the number moles of sulfuric acid. To do this find the molar mass of sulfuric acid.
Molar Mass of H2SO4 = (1 g/mol*2) + (32 g/mol) + (16 g/mol * 4) = 98 g/mol
Then divide the mass of sulfuric acid by the molar mass of the sulfuric acid to get the number of moles of sulfuric acid.
(10 g)/(98 g/mol) = 0.10204 mol
Then use the molar ratios to determine the moles of gas produced. In this case all of the ratios are 1 to 1 meaning that 0.10204 mol of H2SO4 produces 0.10204 mol of H2O and 0.10204 mol of SO3. That means that 0.2041 moles of gas are produced as a result of the reaction.
The next thing to do is to convert the temperature to Kelvin since gas equations need Kelvin. To do this add 273.15.
350 degrees C + 273 = 623.15 K
Now the PV=nRT can be used and when solving for pressure the equation can be written P=nRT/V.
P = pressure and is the unknown
V = volume and is 3.00 L
n = moles of gas and is 0.2041 mol
R = gas constant and is 0.08205 L atm/mol K
T = temperature and is 623.15 K
P = (0.2041 mol * 0.08205 L atm/mol K * 623.15 K) / 3.00 L
P = 3.4785 atm which is 3.48 atm when rounded to three significant figures
I hope this helps. Let me know if anything is unclear.
The total pressure of the container has been 3.48 atm.
In the decomposition of 10 grams of sulfuric acid, the moles of sulfuric acid has been:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of sulfuric acid = [tex]\rm \dfrac{10\;g}{98\;g/mol}[/tex]
Moles of sulfuric acid = 0.1024 moles.
The balanced chemical equation for the reaction results in the formation of 1 mole of water and 1 mole of [tex]\rm SO_3[/tex]. Thus, the decomposition of 1 mole of gas produces 2 moles of the product.
The moles of the product by decomposition of 0.1024 moles of sulfuric acid has been:
1 mole sulfuric acid = 2 moles product
0.1024 moles sulfuric acid = 0.2048 moles product.
From the ideal gas equation:
PV = nRT
P = pressure
V = volume = 3 L
n = moles = 0.2048 moles
R = constant = 0.08205 L atm/mol K
T = temperature = 623.15 K
Substituting the values:
Pressure × 3 L = 0.2048 mol × 0.08205 L atm/mol K × 623.15 K
Pressure = 3.4785 atm.
The pressure of the system has been 3.48 atm.
For more information about the pressure of the system, refer to the link:
https://brainly.com/question/908756
Some molecules such as iodine have two atoms to make up the substance, while others have thousands. A molecule of sugar has 45 atoms to make up the substance. If a sugar crystal has 1000 molecules, how many atoms are present?
Answer:
45000 atoms
Explanation:
From the question given above, we were told that a molecule of a sugar is made up of 45 atoms. This implies that:
1 molecule of sugar = 45 atoms
With the above idea in mind, we can obtain the number of atoms present in 1000 molecules of the Sugar as follow:
1 molecule of sugar = 45 atoms
Therefore,
1000 molecules of sugar = 1000 × 45 = 45000 atoms.
Therefore, there are 45000 atoms present in 1000 molecules of the sugar.
im just typing so u can give them brainliest :)
While in Europe, if you drive 109 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 22.0 mi/gal ? Assume that 1euro=1.26dollars.
Answer:
The amount is [tex]x = 113.3 \ dollars[/tex]
Explanation:
From the question we are told that
The distance traveled per day is [tex]l = 109\ km = \frac{109}{1.609} = 67.74 \ mi[/tex]
The cost of one liter is [tex]c = 1.10 \ euros/liter = 1.10 * 1.26 = 1.36 \ dollars/liter[/tex]
The car's gas mileage is [tex]b = 22.0 \ mi/gal[/tex]
Generally the amount of distance covered in one week is evaluated as
[tex]z = 67.74 * 7[/tex]
[tex]z = 474.18 \ mi[/tex]
The amount of gas used in one week by the car is mathematically represented as
[tex]k = \frac{ z}{ b}[/tex]
=> [tex]k = \frac{ 474.18}{ 22}[/tex]
=> [tex]k = 22 \ gal[/tex]
converting to liters
[tex]k = 22 * 3.78541=83.28 \ liters[/tex]
Thus the amount spent on gas in one week is
[tex]x = k * c[/tex]
=> [tex]x = 83.28 * 1.36[/tex]
=> [tex]x = 113.3 \ dollars[/tex]
You take the following measurements in a density determination according to the procedure in part 1 using a triple beam balance and graduated cylinder. what is the density of liquid to be correct number of significant figure.
weight of cylinder + 19.7 mL liquid = 58.20 g
weight of cylinder + 10.2 mL liquid = 49.50 g
Answer:
0.916g/mL is the density of the liquid
Explanation:
Density is defined as the mass of a substance in a determined volume (Usually grams per mililiter).
The only difference between the first and second measurements is the volume of the liquid:
19.7mL - 10.2mL = 9.5mL is the difference in volume of the liquid between first and second weighs.
This volume, 9.5mL, weighs:
58.20g - 49.50g = 8.7g
As density is the ratio between mass in grams and volume in mL:
Density: 8.7g / 9.5mL
0.916g/mL is the density of the liquidImagine that you are in the laboratory and find broken glass on your
workbench. Describe what you would do to handle this situation.
Your answer
Please help
Answer:
Laboratory is a place where all the experiments are to be done by the students or teachers so it should be safe and clean. I will not allow anyone inside until the glass peaces are cleaned
Calculate the MASS if the density is 2.34 g/mL and the volume is 12.50 mL.
Answer:
mass = 29.25 gExplanation:
The denisty of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
Making mass the subject we have
mass = Density × volumeFrom the question
Density = 2.34 g/mL
volume = 12.50 mL
Substitute the values into the above formula and solve for the mass
That's
mass = 2.34 × 12.50
We have the final answer as
mass = 29.25 gHope this helps you
A student completes a titration of an unknown diprotic acid. In this experiment, 0.79 g of the acid is dissolved in 250.0 mL of water. It requires 13.48 mL of 1.0 M NaOH to reach the second equivalence point. What is the molar mass of the acid?
Answer:
117.21g/mol
Explanation:
The reaction of a diprotic acid, H₂X with NaOH occurs as follows:
H₂X + 2NaOH → Na₂X + 2H₂O
Where 2 moles of NaOH reacts per mole of the diprotic acid
Knowing the moles of NaOH and the chemical equation we can determine the moles of the diprotic acid. With the moles and its mass we can find the molar mass of the acid, thus:
Moles of the diprotic acid:
To reach the equivalence point, it requires 13.48mL = 0.01348L of 1.0M NaOH. That is:
0.01348L × (1mol NaOH / L) = 0.01348 moles NaOH
As 2 moles of NaOH reacts per mole of the diprotic acid, moles of the acid are:
0.01348moles NaOH × (1mol H₂X / 2mol NaOH) = 0.00674 moles of H₂X
Molar mass:
The molar mass of a compound is the ratio between the mass you have per mole. As mass is 0.79g and moles are 0.00674moles, molar mass is:
Molar mass: 0.79g / 0.00674mol =
117.21g/mol