a hypothetical element has a bcc crystal structure, an atomic radius of 0.132 nm, and an atomic weight of 137.3 g/mol. what is the density of this element? express your answer in units of g/cm3.
Answers
The atomic weight of a hypothetical element is 137.3 g/mol, and it has a bcc crystal structure with an atomic radius of 0.132 nm. The density of this element is 9.05 g/\(cm^3.\)
The body-centered cubic (bcc) crystal structure has 2 atoms per unit cell, and the atomic radius (r) of the element is 0.132 nm. The volume of the unit cell (V) can be calculated as:
V = a^3 * \(2^(1/2)\\\)
a = 4(0.132 nm) / \((3)^(1/2)\) = 0.3579 nm
V = (0.3579 nm)^\(3 * 2^(1/2)\)= 0.04516 nm^3
Avogadro's number (NA) is 6.022 x \(10^23 mol^-1.\) The mass of one atom (m) can be calculated as:
m = M / NA
m = 137.3 g/mol / (6.022 x \(10^23 mol^-1\)) = 2.281 x \(10^-22\)g
The density (ρ) of the element can be calculated as:
ρ = (2 * m) / V
ρ = 2(2.281 x \(10^-22\) g) / 0.04516\(nm^3\)
Converting nm to cm:
1 nm = 1 x\(10^-7\) cm
0.04516\(nm^3\) = (0.04516 x \(10^-7\) cm)^3 = 0.8217 x\(10^-21 cm^3\)
ρ = 9.05 g/\(cm^3\)
Therefore, the density of this hypothetical element with a bcc crystal structure, an atomic radius of 0.132 nm, and an atomic weight of 137.3 g/mol is 9.05 g/\(cm^3.\)
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Related Questions
Form similar pairs of words.
Boron : B :: Beryllium :
Answers
Answer:
Boron : B :: Beryllium :Be
Explanation:
Boron is an element found in group 13 of the periodic table. It has three electrons in its outermost shell hence a valency of 3.
Beryllium is an element in group two of the periodic table. It has a valency of two hence there are two electrons in its outermost shell.
Boron and beryllium are similar words. The symbol of boron is B while the symbol of beryllium is Be.
Sodium (Na) has 11 protons and 12 neutrons. What is its isotope notation?
A. Na-11
O B. Na-12
C. Na-23
D. Na-34
Answers
Answer:
Na ²³
ndnxnxnxnxnxnxnxnxn
Answer: C. Na-23
Explanation:
Apx
PLEASE HELP 100 POINTS!!!! AND GIVING BRAINLIEST!!!!!!!!
Why should a movie producer consider filming a new version of The First Men in the Moon? Create a 6-8 slide multimedia presentation to market your idea for this movie to a production company. Rubric Criteria Points Possible 20 (10) 11-19 (6-9) 6-10 (3-5) 0-5 (0-2) Points Earned Ideas & Content Relates Theme of Novel Provides analysis of character Accurate diagram of plot 20 Establishes a theme, relates an analysis of the protagonist, effectively summarizes the plot, and maintains a clear focus throughout. Establishes a theme, identifies some character traits of the protagonist, provides a summary of the plot, and maintains focus throughout. There are a few lapses in focus, but the theme is fairly clear. Presents somewhat of an analysis of character. The plot summary is mostly correct. It is difficult to figure out the theme of the novel. The character analysis is poor or not present. The plot summary does not accurately represent the story. Organization Structure Precision Focus 20 Strong organization; seamless transitions between ideas; Effective and precise content. Organization is appropriate but conventional; Attempt at a focused and precise sales pitch. Attempts at organization, inappropriate use of lists or bullets; content is unfocused and ideas are not developed No clear organizational framework or transitions. Ideas are vague or unfocused Voice Personality Sense of audience 20 Strong awareness of audience in the design. Students can clearly explain why they felt the vocabulary, audio and graphics chosen fit the target audience. Some awareness of audience in the design. Students can partially explain why they felt the vocabulary, audio and graphics chosen fit the target audience. Some awareness of audience in the design. Students find it difficult to explain how the vocabulary, audio and graphics chosen fit the target audience. Limited awareness of the needs and interests of the target audience. Images and Music Relevance to theme Effectiveness Imagery 10 Images and music stir a rich emotional res
Answers
Answer:-Science have researched more facts and cool things about it-It would have more facts and things to learn-The quality would be better and more understandingI just tried 3 quick ideas I hope it can help a bit
Explanation:
Answer:
the answer is you should know this already :)))))))))))))))))))))))))))))))))))))))))))))))))))
PLEASEEE HELP MEEEE!!! How many grams of iron (III) oxide will be produced if 4300 kJ of heat energy is released?
4 Fe+ 3 O2 → 2 Fe2O3
ΔH = -1652 kJ
Answers
Answer: 652.8 g of iron (III) oxide produced.
Explanation:
To calculate the amount of iron (III) oxide produced, we use the enthalpy change of the reaction to determine the amount of energy released and convert it to moles of Fe2O3 produced. Then, we multiply by the molar mass of Fe2O3 to obtain the mass of Fe2O3 produced. Using these calculations, we get 652.8 g of iron (III) oxide produced.
580.84 grams of iron (III) oxide will be produced when 4300 kJ of heat energy is released.
Given:
Enthalpy change (∆H) value: ∆H = -1652 kJ
Amount of heat energy released: 4300 kJ
From the balanced equation:
4Fe + 3O₂ → 2 Fe₂O₃
The molar ratio between Fe₂O₃ and ∆H is 2:1652 kJ.
To find the molar amount of Fe₂O₃ produced, the following calculation:
\(4300 \times \frac{2}{1652}\) = 5.20 mol Fe₂O₃
To convert this into grams, it is required to multiply the molar amount by the molar mass of Fe₂O₃:
5.20 × 2 × 55.85 = 580.84 g
Therefore, 580.84 grams of iron (III) oxide will be produced when 4300 kJ of heat energy is released.
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How many grams are there in 1.45 kg?
Answers
Answer:
1.45 kg
Explanation:
common sense ok
Answer:
1450 grams are in 1.45 kilograms
Why is 1-methylhexane not a legitimate name for a compound?
Answers
Answer:
It is not a legitimate chemical name because the methyl group on carbon 1 increases the length of the carbon chain to seven carbon atoms thus making the parent compound heptane
Explanation:
Chemical compounds are named according to rules in the IUPAC nomenclature.
In naming organic compounds, parts of rules is to find out the parent or root compound. This is determined by finding out the longest carbon chain and then checking if it contains single or multiple bonds. (that is if it is an alkane- with single bonds, alkene-with double bonds or an alkyne- with triple bonds)
From the question the parent or root name is an alkane containing 6 (Hex-) carbon atoms, while the methyl group is substituent
(CH₃)-CH₂-CH₂-CH₂-CH₂-CH-CH₃
However the alkyl substituent on carbon 1 increases the the length of the carbon chain to 7 (Hept-) instead of 6. Hence the correct IUPAC nomenclature is heptane and not 1-methylhexane.
What does global wind mean
Answers
Answer:
Global winds are the main belts of wind that move in a particular direction across the earth
Answer:
Global winds are the main belts of wind that move in particular directions across the Earth.
Explanation:
All wind is caused by the uneven heating of Earth's surface, which sets convection currents in motion. Convection currents on a large scale cause global winds; convection currents on a small scale cause local winds.
hope that helps love!
The bomb that destroyed the murrah federal office building in oklahoma city in april 1995 was constructed from ordinary materials: fertilizer (ammonium nitrate) and fuel oil (a mixture of long-chain hydrocarbons, similar to decane, c10h22).
Answers
The standard enthalpy change of the explosive reaction is -11408 kJ/mol.
The standard enthalpy change of the reaction can be calculated using the enthalpy of formation values of the reactants and products.
The enthalpy of the formation of ammonium nitrate (NH4NO3) is -393.5 kJ/mol, the enthalpy of the formation of the fuel oil (C10H22) is -249.7 kJ/mol, the enthalpy of the formation of oxygen (O2) is 0 kJ/mol.
The enthalpy of the formation of nitrogen (N2) is 0 kJ/mol, the enthalpy of the formation of water (H2O) is -285.8 kJ/mol, and the enthalpy of the formation of carbon dioxide (CO2) is -393.5 kJ/mol.
The equation for the explosive reaction is 3NH4NO3(s)+C10H22(l)+14O2(g)>3N2(g)+17H2O(g)+10CO2(g). Therefore, the standard enthalpy change of the reaction can be calculated using the following equation:
ΔH = [3(-393.5) + (-249.7) + (14*0) + (3*0) + (17*-285.8) + (10*-393.5)] - [3(-393.5) + (-249.7) + (14*0)]
ΔH = -11408 kJ/mol.
Therefore, the standard enthalpy change of the explosive reaction is -11408 kJ/mol.
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The complete question is attached below.
the majority of ventricular filling occurs while the ventricles and atria are in what state(s)?
Answers
The majority of ventricular filling occurs while the ventricles and atria are in the diastole state.
During the cardiac cycle, the heart undergoes alternating phases of contraction and relaxation. Diastole refers to the relaxation phase when the heart chambers are filling with blood. The cardiac diastole consists of two main phases: early diastole and late diastole. The majority of ventricular filling occurs during the late diastole phase.
In this phase, both the ventricles and atria are in a relaxed state, allowing blood to flow passively from the atria into the ventricles. The atria receive blood from the veins and contract slightly to push the remaining blood into the ventricles before ventricular contraction begins. This passive filling of the ventricles accounts for most of the blood volume entering the ventricles before they contract during systole.
Thus, the ventricular filling occurs primarily during the diastole state, particularly during the late diastole phase when the ventricles and atria are relaxed.
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Given that a particular photon has a frequency of 2.2 x 10'7 Hz, calculate the photon's energy. Submit your answer in
scientific notation, rounded to two significant figures.
The energy of the photon is
X10
Answers
Answer:
E = 15×10⁻²⁹ J
Explanation:
Given data:
Frequency of photon = 2.2× 10⁷ Hz
Energy of photon = ?
Solution:
Formula:
E = h.f
h = 6.63×10⁻³⁴ Js
by putting values,
E = 6.63×10⁻³⁴ Js × 2.2× 10⁷ s⁻¹
E = 14.586 ×10⁻²⁹ J
E = 15×10⁻²⁹ J
The energy of photon is 15×10⁻²⁹ J.
What is the mass percentage of C in
CH3CH3?
Answers
The mass percentage of C in CH3CH3 is 80%. Mass percentage of C = (Atomic weight of C x number of C atoms in the molecule) / Molecular weight of the molecule x 100% = 80%
The molecular formula of CH3CH3 is C2H6. In this molecule, there are two carbon atoms and six hydrogen atoms. To calculate the mass percentage of C in this molecule, we need to know the molecular weight of the whole molecule and the atomic weight of C.
The molecular weight of C2H6 is:
(2 x atomic weight of C) + (6 x atomic weight of H)
= (2 x 12.01) + (6 x 1.01)
= 24.02 + 6.06
= 30.08 g/mol
The atomic weight of C is 12.01 g/mol.
Now, to calculate the mass percentage of C in CH3CH3, we can use the following formula:
Mass percentage of C = (Atomic weight of C x number of C atoms in the molecule) / Molecular weight of the molecule x 100%
= (12.01 x 2) / 30.08 x 100%
= 24.02 / 30.08 x 100%
= 79.89%
Therefore, the mass percentage of C in CH3CH3 is 80%.
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Please help need honest answers don’t be cruel
Answers
Answer:
Possibly:
Matter consists of atoms atoms arrange into different compounds to make certain molecules
Yes you can divide atoms into even smaller particles
Protons neutrons electrons
Plum pudding
Explanation:
a 110.0 g sample of metal at 85.0 degrees c is added to 110.0 g of h2o liquid at 24.00 c in an insulated container the temperature rises to 311.56 degrees c neglecting the heat capacity of the container what is the specific heat of the metal
Answers
To determine the specific heat of the metal, we can use the equation:
Q = mcΔT
where Q is the heat transferred, m is the mass of the metal, c is the specific heat of the metal, and ΔT is the change in temperature.
First, let's calculate the heat transferred to the water:
Q_water = mw * cw * ΔTw
where mw is the mass of water, cw is the specific heat of water, and ΔTw is the change in temperature of water.
Given:
mw = 110.0 g (mass of water)
cw = 4.18 J/g°C (specific heat of water)
ΔTw = (311.56 - 24.00) °C (change in temperature of water)
Q_water = (110.0 g) * (4.18 J/g°C) * (311.56 - 24.00) °C
Next, let's calculate the heat transferred to the metal:
Q_metal = mm * cm * ΔTm
where mm is the mass of the metal, cm is the specific heat of the metal, and ΔTm is the change in temperature of the metal.
Given:
mm = 110.0 g (mass of metal)
ΔTm = (311.56 - 85.0) °C (change in temperature of metal)
Since the container is insulated, the heat lost by the water is equal to the heat gained by the metal:
Q_water = Q_metal
Therefore, we have:
(mw * cw * ΔTw) = (mm * cm * ΔTm)
Solving for cm (specific heat of the metal), we get:
cm = (mw * cw * ΔTw) / (mm * ΔTm)
Now, substitute the given values into the equation to calculate the specific heat of the metal.
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HELP PLZ
Write a Scientific Explanation, minimum of 5 paragraphs: What makes weather change, what cause storms? Why is weather different from place to place?
Answers
Answer:
Scientific Explanation of weather change and cause storms is described below in detail.
Explanation:
The weather is just the nature of the environment at any time, including items such as warmth, rainfall, air pressure, and cloud shelter. Daily variations in the weather are due to storms and winds. Seasonal variations are due to the Earth spinning nearby the sun. Warm beginnings often produce stormy weather as the heated air mass at the exterior rises above the cool air mass, creating clouds and storms.
Balance these equations:
H² + Br² = HBr
Mg + O² = MgO
H² + O² = H²O
Answers
Explanation:
H² + Br² = 2HBr
2Mg + O² = 2MgO
2H² + O² = 2H²O
hope this helps you
Answer:
H² + Br² = 2HBr
2Mg + O² = 2MgO
H² + O² = 2H2O
HOPE IT'S WORK
Most elements are metals. What is a
physical property of metals?
A. They conduct heat.
B. They are man-made.
C. They float in water.
Answers
Answer:
A. They conduct heat.
Explanation:
At first, Greg does not take responsibility for having used worms to scare the kindergarteners. The claim
Answers
Greg denies his involvement in using worms to scare the kindergarteners. This statement implies that Greg is unwilling to accept responsibility for his actions and is attempting to distance. Option A is correct.
Greg's refusal to take responsibility suggests that he is avoiding acknowledging his role in using worms to scare the kindergarteners. By denying his involvement, Greg may be trying to evade potential consequences or consequences or negative perceptions associated with his actions. This behavior indicates a lack of accountability and a reluctance to face the repercussions of his actions.
Denying responsibility can stem from various factors, such as fear of punishment, embarrassment, or a desire to maintain topic sentence positive image. However, refusing to accept responsibility for one's actions hinders personal growth and the development of trust and accountability within relationships and communities. Taking responsibility for our actions involves acknowledging the impact they have had on others, learning from our mistakes, and making amends when necessary. It is an essential aspect of maturity and ethical behavior.
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The Complete question is
This topic sentence is based on Diary of a Wimpy Kid by Jeff Kinney.
At first, Greg does not take responsibility for having used worms to scare the kindergarteners. Show hint
A. Strong: Claim
B. Weak: Not a Claim
which statement correctly describes a scienfic theory
Answers
Answer:
B) It is based on repeated investigations.
Explanation:
If this is your question:
Which statement correctly describes a scientific theory?
A) It is accepted as true indefinitely.
B) It is based on repeated investigations.
C) It is equivalent to a scientific law.
D) It is accepted as false.
Question: If red dye is added to cold water and blue dye is added to warm water, which dye will
spread out quicker?
Answers
Answer:
Blue dye spreads out quicker
Explanation:
This is because the dye gets spread out by water molecules. Warm water has faster moving water molecules than cold water.
Which of the following is NOT an example of how biotic factors interact with abiotic factors in an ecosystem?
A lion preys on a herd of gazelle.
⊝
Plants remove carbon dioxide from the air and add oxygen.
⊝
Animals cause erosion by digging in the dirt.
⊝
A lizard raises its body temperature by using heat from the Sun.
⊝
CLEAR ALL
Answers
Answer:
A lion preys on a herd of gazelle.
Explanation:
lions and gazelles are both biotic factors since they are living organisms.
A quantity of monatomic ideal gas expands adiabatically from a volume of 2.0 liters to 6.0 liters. if the initial pressure is p0, what is the final pressure?
Answers
Answer:
1/3p0
Explanation:
The combined gas law:
P1V1/T1 = P2V2/T2, where P, V and T are Pressure, Volume, and Temperature. Temperature must always be in Kelvin. The subscriopts 1 and 2 are for initial (1) and final (2) conditions.
In this case, temperature is constant (adiabatically). V1 = 2.0L and V2 = 6.0L. I'll assume P1 = p0.
Rearrange the combined gas law to solve for final pressure, P2:
P1V1/T1 = P2V2/T2
P2 = P1*(V1/V2)*(T2/T1) [Note how I've arranged the volume and temoperature terms - as ratios. This helps us understand what the impact of raising or lowering one on the variables will do to the system].
No enter the data:
P2 = P1*(V1/V2)*(T2/T1): [Since T2 = T1, the (T2/T1) terms cancels to 1.]
P2 = p0*(2.0L/6.0L)*(1)
P2 = (1/3)p0
The final pressure is 1/3 the initial pressure.
if i take 2 tables two times per day with 300 tables how many days will my prescription last
Answers
Answer:
150
Explanation:
300 divided by 2
can you answer with working out
Answers
Which statement about the balanced equations for nuclear and chemical changes is correct? (1 point)
o A chemical equation is balanced according to mass number. A nuclear equation is balanced according to the total mass before and after the change.
o Both are balanced according to the total mass before and after the change.
o Both are balanced according to the mass number of each element before and after the change.
o Both are balanced according to the mass number of each element before and after the change.
o A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the total mass before and after the change.
Answers
The true statement about the balanced equations for nuclear and chemical changes is; both are balanced according to the total mass before and after the change.
A basic law in science is called the law of conservation of mass. Its general statement is that mass can neither be created nor destroyed.
Both in chemical and nuclear changes, mass is involved and in both cases, the law of conservation of mass strictly applies.
This means that for both chemical and nuclear changes; total mass before reaction must be equal to total mass after reaction.
Hence, both reactions are balanced according to the total mass before and after the change.
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Answer:
last option. A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the total mass before and after the change.
Explanation:
took the test.
3
The chemical formula NHCl indicates that the formula contains -
A 1 nitrogen atom, 1 hydrogen atom, and 1 chlorine atom
B 1 nitrogen atom, 4 hydrogen atoms, and 4 chlorine atoms
Ci nitrogen atom, 4 hydrogen atoms, and 1 chlorine atom
D 4 nitrogen atoms, 4 hydrogen atoms, and 1 chlorine atom
Answers
The formula contains : C. 1 nitrogen atom, 4 hydrogen atoms, and 1 chlorine atom
Further explanationGiven
NH₄Cl compound
Required
The number of atoms
Solution
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
A molecular formula is composed of two or more elements formed of the same or different types.
A subscript indicating the number of atoms forming a molecule
So for NH₄Cl , there are 3 different elements, N, H and Cl, and the number is shown from the subscript
N : 1 atomH : 4 atomsCl : 1 atom
If an object has a density more then 1 g/m0, what will happen when its placed in water?
Answers
Answer:
it will sink to the bottom
Explanation:
if it has a higher density than the water then it will sink.
how can paper that has already been used be physically changed
Answers
Answer:
the paper could be burn up
How does the rate law show how concentration changes affect the rate of
reaction?
A. The rate is expressed as the sum of the concentrations of
reactants raised to some power.
B. The rate is expressed as the difference between the
concentrations of reactants.
C. The rate is expressed in terms of concentrations of the reactants
raised to some power.
D. The rate is expressed as a ratio of the concentrations of reactants
raised to some power.
SUBMIT
Answers
Answer: C
Explanation: I just did it
The rate law show how concentration changes affect the rate of
reaction. The correct statement is "The rate is expressed in terms of concentrations of the reactants raised to some power".
So, the correct option is C.
What is the rate law?The rate law is a mathematical expression which give relation between rate of reaction to the concentration of reactant.
Let suppose the reaction, A + B → C
Rate law is written as, rate = [A]n[B]m
Where, n and m is order of reaction which determine by experimental.
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What is the amount of heat absorbed when the temperature of 75 grams of water increases from 20°C to 35°C?
1.
1100 J
2.
4700 J
3.
6300 J
4.
11 000 J
Submit Answer
de Toolbar
Answers
The amount of heat absorbed when the temperature of 75 grams of water increases from 20°C to 35°C is 4,697.5 J or 4.7 kJ. Option 2 is correct.
The amount of heat absorbed when the temperature of 75 grams of water increases from 20°C to 35°C can be calculated using the specific heat capacity of water and the formula Q = mCΔT, where Q is the amount of heat absorbed, m is the mass of water, C is the specific heat capacity of water, and ΔT is the change in temperature.
The specific heat capacity of water is 4.18 J/g°C, so the calculation would be:
Q = 75 g x 4.18 J/g°C x (35°C - 20°C)
Q = 75 g x 4.18 J/g°C x 15°C
Q = 4,697.5 J or 4.7 kJ
Therefore, the amount of heat absorbed when the temperature of 75 grams of water increases from 20°C to 35°C is 4,697.5 J or 4.7 kJ, which is option 2.
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A cross results in three phenotypes. A nual typothesis of recessive epistasis is tested. Your calculated chi-square value is 6.4. Assuming a p Value of 0.05, do you reject the null frypothesis? yes. No
Answers
The null hypothesis is rejected when the chi-square value is higher than the critical value or p-value. In this case, the chi-square value of 6.4 is higher than the critical value for a p-value of 0.05, which is 3.84. Therefore, the null hypothesis is rejected.
A cross results in three phenotypes. A null hypothesis of recessive epistasis is tested. Your calculated chi-square value is 6.4. Assuming a p-value of 0.05, do you reject the null hypothesis?The answer is yes.What is a chi-square value?A chi-square value is a measure of how different two sets of data are. It compares the observed data to the expected data and generates a statistic that shows how far apart they are. It compares the observed data to the expected data and generates a statistic that shows how far apart they are. The chi-square test is a statistical hypothesis test that is used to determine if there is a significant difference between two groups of data. The null hypothesis is rejected when the chi-square value is higher than the critical value or p-value. In this case, the chi-square value of 6.4 is higher than the critical value for a p-value of 0.05, which is 3.84. Therefore, the null hypothesis is rejected.
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