Answer:
The correct option is b. false
Explanation:
The distance between the nucleus of an atom and it's outermost shell is called is atomic radius. The atomic radius of an Iron atom (Fe) is 0.126 nm or 1.26 angstrom. The distance between the nuclei of two Iron atoms will be 1.26 × 2 = 2.52 angstroms.
Since 2.52 angstroms is lower than 4 angstroms, the correct option is false
Three different samples were weighed using a different type of balance for each sample. The three were found to have masses of 0.6160959 kg, 3.225 mg, and 5480.7 g. The total mass of the samples should be reported as?
Answer:
6.1 kg
Explanation:
To obtain the total mass of the sample, we must first express each mass of the sample in the same unit of measurement.
Since the SI unit of mass is kilogram (kg), we shall express the total mass of the samples in kilogram (kg).
This is illustrated below:
Mass of the samples are:
M1 = 0.6160959 kg
M2 = 3.225 mg
M3 = 5480.7 g.
Conversion of 3.225 mg to kg
1 mg = 1×10¯⁶ kg
Therefore,
3.225 mg = 3.225 × 1×10¯⁶
3.225 mg = 3.225×10¯⁶ kg
Conversion of 5480.7 g to kg
1000 g = 1 kg
Therefore,
5480.7 g = 5480.7 /1000
5480.7 g = 5.4807 kg
Thus, we can obtain the total mass of the samples as follow:
M1 = 0.6160959 kg
M2 = 3.225×10¯⁶ kg
M3 = 5.4807 kg
Total mass =?
Total mass = M1 + M2 + M3
Total mass = 0.6160959 + 3.225×10¯⁶ + 5.4807
Total mass = 6.096799125 ≈ 6.1 kg
Therefore, the total mass of the samples is approximately 6.1 kg.
How many moles of CO2 are produced when 2.5 moles of O2 react according to the following equation?
C3H8 + 5O2 ? 2FeO + 3SO2
Answer:
1.5 moles of CO₂ are produced
Explanation:
Based on the chemical equation:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O -The reaction of the question is wrong-
5 moles of oxygen reacts per mole of propane, C₃H₈, to produce 3 moles of CO₂ and 4 moles of water.
If 2.5 moles of oxygen react and, 5 moles of oxygen produce 3 moles of CO₂, moles of CO₂ produced are:
2.5 moles O₂ * (3 moles CO₂ / 5 moles O₂) =
1.5 moles of CO₂ are producedWhich of the following compounds would be more soluble in 1 M NH3 than in pure water? BaSO 4 AgBr Pbl 2 BaF 2 Ca(OH) 2
Answer:
AgBr
Explanation:
The salt, AgBr has a very low solubility is pure water. However, it has a high solubility in 1 M NH3. The reason behind this higher solubility of AgBr in 1 M aqueous ammonia solution is the formation of a complex as shown below;
AgBr(s) + 2NH3(aq) ----> [Ag(NH3)2]^+(aq) + Br^-(aq)
The formation of this linear silver diammine complex accounts for the higher solubility of AgBr in 1 M aqueous ammonia solution.
What are the parts of the water system? Label the water wheel to show the matter and forms energy that flow through the system.
Answer:
Source, processing and distribution are the components of water system.
Explanation:
There are three parts of water system i. e. the source, the processing and distribution. Water is extracted from a source such as underground water, lake or river etc. After extraction this water is transported to the processing unit where it can be purified and after purification it is distributed to all places where it is needed. Potential energy is a form of energy that flows through this water system because the water is extracted from a depth and we know that depth and height refers to potential energy.
How can you determine which bond in a structure is more polar without using an electronegativity table?
Answer:
How can you determine which bond in a structure is more polar without using an electronegativity table?
Explanation:
When we say something is polar, it has a very specific meaning. It means that there is a spatial separation of charges, or a dipole moment. In the simplest case, this is given by:
μ=Qr
Where μ is the dipole moment, Q is the charge on each pole (equal and opposite) and r is the distance between the charges.
Anything with charges can have a dipole moment, and therefore be polar. In chemistry, we typically worry about whether or not two things are polar:
Bonds
Molecules
Bond Polarity
Chemists are concerned with the polarity of bonds because polarity affects the character of the bond - the more polar the bond is, the more it behaves like an ionic bond. The less polar, the more it behaves like a covalent bond. This has implications for everything from naming rules to reactivity, but all you need to know for this problem is:
All bonds between two atoms are polar, unless the atoms are identical.
(This is including whatever else the atoms may be bonded to). The only question after that is "how polar is the bond," and that is where tables of electronegativity come in. Using an arbitrarily defined scale, we can measure the relative polarity of bonds by comparing the difference in electronegativity between the two elements.
Molecule Polarity
For molecules, polarity isn't quite so simple. We know that all bonds between dissimilar atoms are polar, but in a molecule, sometimes the dipole moments add up to form a net dipole moment of zero. This is a little bit difficult to explain if you don't have a mathematics and physics background that includes vectors and summations of forces/moments.
If you do, then when I say something like:
The net dipole moment for a molecule is equal to the sum of dipole moments over each bond.
It will make sense to you. If you don't, then you have to get a little more creative. I tell my students to imagine that there are ropes connecting each outer molecule to the central molecule, along each bond. Then imagine pulling each rope towards the side that is more electronegative (has a higher electron density). The more polar the bond, the harder you pull on the rope. Then imagine whether the molecule moves. If the forces balance, it stays put, so the net dipole moment is zero and it is not polar. If it does move, there was a net dipole moment, so it is polar.
This works pretty well - as long as you can visualize the molecular geometry. That's the hard part. To know how the bonds are oriented in space, you have to have a strong grasp of Lewis structures and VSEPR theory. Assuming you do, you can look at the structure of each one and decide if it is polar or not - whether or not you know the individual atom electronegativity. This is because you know that all bonds between dissimilar elements are polar, and in these particular examples, it doesn't matter which direction the dipole moment vectors are pointing (out or in).
Let's look at each one, using wikipedia's geometric pictures.
BrF5
BrF5
As you can see, there is a lone pair at the bottom (this is a square pyramidal geometry). The net dipole moment will be pointing "up", which makes this a polar molecule.
PBr5
PBr5
This one has a trigonal bipyramidal geometry, with each bond symmetrically opposed to each of the others. If you add up the vectors, they result in a net dipole moment of zero. Therefore, it is non-polar.
EDIT: As ron points out in the comments below, this is not really a binary molecular compound, and in reality forms an ionic crystal structure with PBr4+ and Br−. I don't think the author of the question intended you to worry about that, but if they did, the answer is still "non polar," although we wouldn't really call it a "molecule" any more.
CCl4
CCl4
Carbon tetrachloride has a tetrahedral geometry, and all the dipole moment vectors cancel. Therefore, it is non-polar.
XeF2
XeF2
This one is linear - no net dipole moment, so it is non-polar.
XeF4
enter image description here
I could only find the ball-and-stick model for this one. It is square planar - there is a lone pair of electrons (not shown) on each "face" of the square on Xe. There is no net dipole moment, so it is also non-polar.
Out of all of these, the only polar molecule is BrF5 (the first one).
If the net dipole moment is zero, it is non-polar. Otherwise, it is polar.
What is the free energy change in kJ/mol for the process below at 43.9 °C when the concentration of A =0.88 M, B = 0.49 M and C = 0.69 M? g
Answer:
-15.5 kJ/mol
Explanation:
2A ⇄ 2B + C
[tex]$ K = \frac{[C][B]^2}{[A]^2} $[/tex]
= [tex]$ \frac{(0.69)(0.49)^2}{0.88^2} $[/tex]
= 0.21
T = [tex]$ 43.9^{\circ} $[/tex]C
= (273 + 43.9) K = 316.9 K
[tex]$ \Delta G^{\circ} = -19.4 $[/tex] kJ/mol
R = 8.314 J/k-mol = 0.008314 kJ/k-mol
[tex]$ \Delta G = \Delta G^{\circ} - RT \ln K $[/tex]
[tex]$ =-19.4 - 0.008314 \times 316.9 \ln (0.21) $[/tex]
= -15.5 kJ/ mol
A sample of pure gold has a mass of 10.2 g. Calculate the number of moles in the sample and gold atoms in the sample.
Answer:
Explanation:
molecular weight of gold = 197
converting 10.2 g into moles
no of moles = 10.2 / 197
= .0518 moles
one mole of any element contains 6.02 x 10²³ number of atoms
.0518 moles will contain 6.02 x .0518 x 10²³ atoms of gold
= .311 x 10²³ no of atoms of gold .
= 3.11 x 10²² no of atoms of gold
Explain the concept of significant figures and why it is important in scientific experiments.
Answer:
Significant figures (also called significant digits) are an important part of scientific and mathematical calculations, and deals with the accuracy and precision of numbers. It is important to estimate uncertainty in the final result, and this is where significant figures become very important.
Explanation:
What is the theoretical yield (in grams) of soap if 500.0 grams of the triglyceride of stearic acid are used?
Answer:
The theoretical yield (in grams) of soap is 514.9 grams
Explanation:
Please see the attachments below
The number of moles of HCl in an aqueous hydrochloric acid solution can be determined as follows
moles=(concentration in M units) (Volume in liters)
for example - in 10.00 ml of 10 M HCI, the number of moles is: moles = (10 moles/L) (0.0100 L) = 0.10 moles
Using this method, which of the follow is correct for the Zn+HCl reaction? we were asked to mix 2 g of Zn with 10ml of HCL
1) HCl reagent was added in excess
2) HCl was the limiting reagent
3) Zn and HCl were added in the stoichiometric amounts
4) The reaction stoichiometry of Zn and HCl cannot be determined
Answer:
1) HCl reagent was added in excess
Explanation:
The equation of the reaction is given as;
Zn + HCl --> ZnCl2 + H2
From the stoichiometry;
1 mol of Zn reacts with 1 mol of HCl
In 2g of Zn;
mass = 2
Molar mass = 65.38g/mol
Number of moles = Mass/ Molar mass = 2 / 65.38 = 0.03059 mol
In 10ml of HCl;
the number of moles is: moles = Concentration * Volume = (10 moles/L) (0.0100 L) = 0.10 moles
Comparing 0.03059 mol of Zn : 0.10 mol of HC with the stochiometry, we can deduce that HCl is by far greater. Hence the correct option is option 1.
49.The 1H NMR spectrum of a compound with formula C7H14O gives a doublet at 9.2 ppm. Which of these structures is a possible one for this compound?
Answer: The possible structure for this compound is 2,4-dimethyl-3-pentanone
Explanation:
It should be noted that, If the 1H NMR spectrum of a compound with formula C7H14O gives a doublet at 9.2 ppm. The possible structure for this compound is 2,4-dimethyl-3-pentanone
Describe what is meant by synthesis. How do the functions of analysis, synthesis, and evaluation relate to each other
Answer:
New element formed by combination of reactants.
Explanation:
Synthesis refers to the production of a new product from the combination of two or more reactants. Analysis, synthesis, and evaluation are related to each other because in synthesis a new product is formed while in analysis, we examine the structure of the new product in detailed and in evaluation, we assess the quantity of a new product. So analysis and evaluation gives a lot of information about the product which is formed in synthesis.
a) What volume of a 1.0 M KI solution must be added to 470.0 mL of a solution that is 0.11 M in Pb2 ion to precipitate all the lead ion
Answer:
0.168mL of the 1.0M KI solution must be added
Explanation:
The PbI₂ is in equilibrium with water as follows:
PbI₂ ⇄ Pb²⁺ + 2I⁻
Where Ksp is:
Ksp = 1.4x10⁻⁸ = [Pb²⁺] / [I⁻]²
As molarity of Pb²⁺ is 0.11M:
1.4x10⁻⁸ = [0.11M] / [I⁻]²
1.27x10⁻⁷ = [I⁻]²
3.57x10⁻⁴M = [I⁻]
Thus, to precipitate all Pb²⁺ you need to add 3,57x10⁻⁴M of I⁻. As volume of the solution is 470.0mL = 0.47L, you need to add:
0.47L * (3,57x10⁻⁴moles / L) = 1.68x10⁻⁴ moles of I⁻ = Moles of KI.
That comes from the 1.0M KI. You need to add:
1.68x10⁻⁴ moles of KI * (L / 1.0 mol) = 1.68x10⁻⁴L =
0.168mL of the 1.0M KI solution must be addedAtomic number of a Carbon atom is 6. How many electrons does it have?
Where is the majority of Earth’s water found?
glaciers
Answer:
Oceans
Explanation:
The majority of water is found in the ocean where it contains 96.5% of earths water. :)
What element is being oxidized in the following redox reaction? Sn 2+(aq) + NH4 +(aq) → Sn(s) + NO3 -(aq)
Answer:
Nitrogen
Explanation:
Hello,
In this case, for the given reaction we first need to assign the oxidation state for each species in the chemical reaction:
[tex]Sn ^{2+}(aq) + (N^{-3}H^+_4)^ +(aq) \rightarrow Sn^0(s) + (N^{5+}O_3^{2-})^ -(aq)[/tex]
In such a way, since the tin is decreasing its oxidation state it is being reduced whereas the nitrogen is being oxidized as its oxidation state is being increased from -3 to +5.
Best regards.
The element which is oxidized in the redox reaction shown below is Nitrogen.
Sn²⁺(aq) + NH⁴⁺(aq) → Sn(s) + NO₃⁻(aq)
In this scenario, the oxidation state of Sn changed from +2 to 0 while the
oxidation state of Nitrogen changed from -3 to +5. The Nitrogen(N) present
in the equation experienced an increase in the oxidation state which means
it was oxidized.
The Tin(Sn) on the other hand experienced a reduction in the oxidation state
which means it was reduced.
Read more on https://brainly.com/question/25544428
Suppose that you wanted to prepare a acetate ion/acetic acid buffer solution with a pH of 4.35. What is the value 34 Marks: 2 off [A l/IHA) for the correct buffer solution for this event? The Ka for acetic acid is 1.8 x 10 5.
a. 0.39
b. 0.407
c. 0.372
d. 4.74
Answer:
b. 0.407
Explanation:
Acetic acid / Acetate ion is a buffer (Mixture of a weak acid, acetic acid, with its conjugate base, acetate ion) with pKa = -log Ka = 4.74.
The simplest way to determine the pH of a buffer is using Henderson-Hasselbalch formula:
pH = pKa + log [Conjugate base] / [Weak acid]
For acetic buffer with pH = 4.35:
4.35 = 4.74 + log [A⁻] / [HA]
-0.39 = log [A⁻] / [HA]
0.407 = [A⁻] / [HA]
Thus, right option is:
b. 0.407plz help me the plz argent
Answer:
Baking powder is combination of baking soda and an edible acid such as tartaric acid. When its added to water it reacts to form carbon dioxide. This carbon dioxide produces wet dough and makes cake soft and spongy
Knowing what intermolecular forces are, if I took two electrons (negatively
charged particles) and tried to put them near each other, what would happen?
Explain your reasoning.
Answer:
They will repel each other.
Explanation:
According to Coulomb's law, the force between two chargee is directly proportional to the product of the magnitude of the both charges and inversely proportional to their distance apart.
The force of attraction between electric charges may be attractive or repulsive in nature. When two negative charges are placed in close proximity to each other, they repel each other because like charges repel each other.
Using the molecular weight (258 g/mol) determine the amount of mmol of (3S)-2,2,- dibromo-3,4-dimethylpentane required.
The question is incomplete, the complete question is;
With all of this data in hand, we can now set up our reaction. To begin we are going to use 0.7 g of (35)-2.2-dibromo-3,4-dimethylpentane. Question #7: Using the molecular weight (258 g/mol) determine the amount of mmol of (3S)-2,2,- dibromo-3,4-dimethylpentane required. Round to the tenths place
Answer:
2.70 mmols
Explanation:
Given that;
Mass of (3S)-2,2,- dibromo-3,4-dimethylpentane = 0.7 g
Molar mass of (3S)-2,2,- dibromo-3,4-dimethylpentane = 258 g/mol
From,
Number of moles = mass/molar mass
Number of moles of (3S)-2,2,- dibromo-3,4-dimethylpentane = 0.7g/258 g/mol = 2.7 ×10^-3 moles
Therefore;
Number of moles of (3S)-2,2,- dibromo-3,4-dimethylpentane = 2.70 mmols
A. What is the Name of Hydrogen Isotope
with one proton?
B. What is the Name of Hydrogen Isotope
with two protons?
C. What is the Name of Hydrogen Isotope
with three protons?
Answer:
A. Protium
B. Deutrium
C. Tritium
Explanation:
A hydrogen isotope with one proton:
Protium
A hydrogen isotope with two protons:
Deutrium
A hydrogen isotope with protons:
Tritium
Hope this helped ;) ❤❤❤
What amount of heat is required to vaporize 143.45 g of ethanol (C₂H₅OH)? (∆Hvap = 43.3 kJ/mol)
Answer:
135 KJ.
Explanation:
The following data were obtained from the question:
Mass of ethanol, C₂H₅OH = 143.45 g
Heat of vaporisation, ∆Hvap = 43.3 kJ/mol
Heat required (Q) =.?
Next, we shall determine the number of mole in 143.45 g of ethanol (C₂H₅OH). This is can be obtained as follow:
Mass of ethanol, C₂H₅OH = 143.45 g
Molar mass of ethanol, C₂H₅OH = (12×2) + (1×5) + 16 + 1
= 24 + 5 + 16 + 1
= 46 g/mol
Mole of ethanol, C₂H₅OH =?
Mole = mass /Molar mass
Mole of ethanol, C₂H₅OH = 143.45/46
Mole of ethanol, C₂H₅OH = 3.118 moles
Finally, we shall determine the heat required to vaporize the ethanol, C₂H₅OH as follow:
Heat of vaporisation, ∆Hvap = 43.3 kJ/mol
Mole of ethanol, C₂H₅OH (n) = 3.118 moles
Heat required (Q) =.?
Q = n•∆Hvap
Q = 3.118 × 43.3
Q = 135 KJ
Therefore, the heat required is 135 KJ
1) Describe enthalpy and the role specific heat plays in the formula. 2) Explain the significance of the sign of the enthalpy value (+ or -) . Provide a specific example. 3) Explain Collision theory and describe the two factors required for a chemical reaction to occur. 4) Connect each of these circumstances to the rate of a reaction. Explain how the change in circumstances could be implemented in a lab and describe the predicted outcome: - Increased temperature - Decreased solution concentration - Increased surface area - Speeding up the reaction without being involved in the reaction. 5) Analyze Le Chatelier’s principle. 6) Based on this theory, what is the overriding guide to predicting outcomes when changes are imposed upon a reaction. What is the impact on equilibrium?
Explanation:
5) Le Chatelier's principle says, when in a reversible reaction any of the concentration or temperature or pressure are changed, then the equilibrium shifts such a way to nullify the changes occurred. (hope you get it)
6) 1.change in concentrationR ======= P
if concentration of reactant R is increased then eqm shifts towards the one with lower concentration ,that is product P.
forward direction is favoured.
2.Change in temperatureif the above's reaction is endothermic, that is temp of product is low. So increasing temperature in such case reaction goes towards product.
forward direction is favoured.
If reaction is exothermic ,temp of reactant is more. So increasing temperature in such case, reaction goes towards reactants.
forward direction is favoured
........ plz brainliest my answer I definitely write you the complete explanation asap!
a cooking cylinder can withstand a pressure of 24 ATM at 27 degree Celsius the pressure of the containing gas is a 12 ATM than the minimum temperature above which cylinder will explode is
1)327⁰c
2)273⁰c
3)300k
4)600k
Answer:
Option A. 327 °C
Explanation:
The following data were obtained from the question:
Initial pressure (P1) = 12 atm
Initial temperature (T1) = 27 °C
Final pressure (P2) = 24 atm
Final temperature (T2) =?
Next, we shall convert 27 °C to Kelvin temperature. This can be obtained as follow:
Temperature (K) = Temperature (°C) + 273
Initial temperature (T1) = 27 °C
Initial temperature (T1) = 27 °C + 273
Initial temperature (T1) = 300 K
Next, we shall the temperature at which the cylinder will explode as follow:
Initial pressure (P1) = 12 atm
Initial temperature (T1) = 300 K
Final pressure (P2) = 24 atm
Final temperature (T2) =?
P1/T1 = P2/T2
12/300 = 24/T2
Cross multiply
12 × T2 = 300 × 24
Divide both side by 12
T2 = (300 × 24) /12
T2 = 600 K
Finally, we shall convert 600 K to celsius temperature.
This can be obtained as follow:
Temperature (°C) = Temperature (K) – 273
Temperature (K) = 600 K
Temperature (°C) = 600 – 273
Temperature (°C) = 327 °C
Therefore, the minimum temperature at which the cylinder will explode is
327 °C.
A rectangular solid has a length of 3 cm, a height of 4 cm and a
width of 5 cm. What is the solid's volume?
cm3
Answer:
[tex]60 cm^{3}[/tex]
Explanation:
volume=lwh
v=3*5*4
v=[tex]60 cm^{3}[/tex]
HELP MEEEE! ‘’’’’’’’’’
Answers
1) 0.55 meters
2) 3500 millimoles
3) 1600 grams
4) 0.0025 kilograms
5) 40 millimeters
6) 5000 milliliters
7) 43200 seconds in 12 hours
86400 seconds in 24 hours
HOPE THIS HELPS:)
Whoever made this needs to do it their self because this took lots of googling. I see that this was just a practice problem so if you have a test google has a great conversion tool, it gives answers right away.
Explanation:
What is the bond character of this molecule?
A.) strongly covalent
B.) Positively charged
C.) Strongly ionic
D.) Negatively charged
Can you tell from the periodic table exactly how many neutrons are in an atom?
Answer: Yes
Explanation:
On the periodic table, you can find the element symbol, name, atomic number, and atomic mass. Just knowing the atomic mass and atomic number can give you the amount of neutrons. The atomic number states the amount of protons. The atomic mass is proton+neutron. Knowing this, you can subtract the atomic mass by the atomic number to get neutron.
Example: Carbon
Atomic number: 6
Atomic mass: 12.011 or 12
12-6=6 [Atomic mass - Atomic number]
There are 6 neutrons in Carbon.
which skill involves creating representation of complex objects or processes
Answer:
Making models
Explanation:
Classifying is the grouping together of items that are alike in some way. Answer: Making models involves creating rep- resentations of complex objects or processes.
Who might benefit from this claim?
The correct answer is D. Grocery stores that sell legumes
Explanation:
One of the main points this claim proposes is that metabolism can be improved by consuming legumes, this is expressed in "incorporating legumes such as lentils and chickpeas... boosts metabolism." In this context, if this is proven as true through an argumentative text or speech, it is likely many people want to increase their intake of legumes because a better metabolism has multiple benefits for health. Moreover, increased intake of legumes means an increase in the sale of legumes and higher profits for stores selling legumes. This means the claim might benefit grocery stores that sell legumens (option D.)