When using the celestial coordinate system, all of the stars can be observed from any location on Earth is not true. Hence option A is correct.
What is celestial coordinate system?Celestial coordinate system is defined as the structured ways to specify the positions of satellites, planets, stars, galaxies, and other celestial objects with relation to the physical reference points that an observer in a particular location may access. The horizon system (altitude and azimuth), galactic coordinates, and the ecliptic system are employed as coordinate systems.
The advantage of using this set of numbers is that you can see the sky turn by roughly one hour's worth of right ascension for every hour of time as the Earth revolves. This makes predicting when celestial objects will appear and disappear easier. The positions of objects on the celestial sphere are defined using a reference system called celestial coordinate.
Thus, when using the celestial coordinate system, all of the stars can be observed from any location on Earth is not true. Hence option A is correct.
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Magnified we see that the carbon atom _______ in place. flashcard
How many more h+ ions does a solution with a ph of 4 than a solution with a ph of 5?
Use the given figure to complete the statement below.
∠1 and ∠3 are angles.
external vertical interior similar
Answer:
B
Explanation: Angle <1 and <3 are vertical angles.
When you look at the graph you can see that they form two pairs of opposite rays.
Identify the compound with the highest standard free energy of formation. identify the compound with the highest standard free energy of formation. no(g)
The standard free energy of formation of nitric oxide (NO(g)) is 86.55 kJ/mol at 25 degrees Celsius. This refers to the energy change during the formation of one mole of the compound from its elements in their standard states. However, different compounds might have higher or lower values depending on various conditions.
Explanation:The standard free energy of formation, or ΔGo°f, refers to the change in energy that occurs when one mole of a compound is formed from its elements in their most stable states at standard conditions (1 atm and 25 °C). It is zero for elemental substances in their standard states.
Nitric oxide (NO) in its gaseous form, specifically, has a ΔGo°f of 86.55 kJ/mol at 25 °C. This value may vary based on the temperature and other conditions of the reaction.
It's important to note that even though NO(g) has a high standard free energy of formation, it doesn't imply that NO(g) is the compound with the 'highest' ΔGo°f across all compounds. The ΔGo°f of a compound would depend on the complexity of the molecule, its elemental composition, and other factors. Therefore the ΔGo°f of different compounds can be looked up in tables in chemical reference books or databases.
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When preparing a buret for use in lab the buret must always be cleaned thoroughly prior to being filled with solution what is burette rinsed with?
Why might the amount of copper produced be less than 100% of the expected amount? Check all possible reasons.
There are impurities in the substances.
The reaction might not go to completion.
The amount of one of the reactants might be measured incorrectly.
The molar ratio may not be correct.
The expected amount might be based on measurements with error.
Answer:
The answers are options 1, 2, 3, and 5.
Explanation:
Hello!
Let's solve this!
When an experiment is carried out and less product is obtained, it may be because:
There are impurities in the substances.
The reaction might not go to completion.
The amount of one of the reactants might be measured incorrectly.
The expected amount might be based on measurements with error.
We conclude that the answers are options 1, 2, 3, and 5.
what mass of magnesium would combine with exactly 16.0 grams of oxygen
Final answer:
The mass of magnesium that would combine with 16.0 grams of oxygen is 12.16 grams.
Explanation:
The balanced chemical equation for the reaction between magnesium and oxygen is:
2Mg + O2 → 2MgO
From the equation, we can see that 2 moles of magnesium combine with 1 mole of oxygen to form 2 moles of magnesium oxide. The molar mass of magnesium is 24.31 g/mol, and the molar mass of oxygen is 16.00 g/mol.
To find the mass of magnesium that would combine with 16.0 grams of oxygen, we first convert the mass of oxygen to moles using its molar mass:
16.0 g O2 ÷ 16.00 g/mol = 1.00 mol O2
Since the magnesium-to-oxygen molar ratio is 2:1, there will be half the number of moles of magnesium as there are moles of oxygen:
1.00 mol O2 × (1 mol Mg ÷ 2 mol O2) = 0.50 mol Mg
Finally, we can find the mass of magnesium using its molar mass:
0.50 mol Mg × 24.31 g/mol = 12.16 grams of magnesium
How many significant figures are in the measurement 811.40 grams?
Answer:
There is 5 significant figures in 811.40 grams
Explanation:
The significant figures are units that can be taking into account to write a figure.
Exists two general rules for it:
1. The numbers including zero (0) that are to the right of the figure are counted as a significant figure example: 345.60 has 5 significant figures
2. The zero (0) that are to the left of the figure are NOT counted as a significant figure example: 0.005 has 1 significant figure
The significant figures are in the measurement 811.40 grams is five.
Significant figures are the digits in a measurement that carry meaningful information and contribute to its precision. Here's how to determine the number of significant figures in 811.40 grams:
All nonzero digits are always considered significant. In this case, the digits 8, 1, and 1 are all nonzero, so they are significant.
Any zeros between nonzero digits are also significant. Here, the zero between the 1s is significant.
Leading zeros (zeros to the left of the first nonzero digit) are not significant. In this measurement, there are no leading zeros.
Trailing zeros (zeros to the right of nonzero digits) are significant when they are after a decimal point. In this case, there are two trailing zeros after the 4, and they are significant because they are after the decimal point.
So, the significant figures in the measurement 811.40 grams are five: 8, 1, 1, 4, and 0.
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What is a mineral phase change?
a. when a mineral melts from a solid state to a liquid state
b. the exterior of a mineral weathers and changes color
c. a mineral changes density because of the addition of water
d. atoms in a mineral are rearranged into a more stable and denser structure?
You live 15.0 miles away from a shopping center and wish to calculate the distance in feet. There are 5280 ft in one mile
The area in which certain types of plants or animals can be found living in close proximity to each other is called a_________
a. community
b. niche
c. kingdom
d. habitat
The correct answer is option (d). The area in which certain types of plants or animals can be found living in close proximity to each other is called a habitat.
A habitat is the area where a particular type of plant or animal lives and grows because it provides the organisms with everything they need to survive such as food, water, shelter, and a place to raise their young.
The concept of a habitat encompasses all the biotic and abiotic factors in an area that an organism needs to survive and reproduce.
The other options are defined as follows:
A community refers to all the populations of different species that live in the same area and interact with each other.A niche is the role and position a species has in its environment; it includes all the ways the species interacts with the biotic and abiotic factors in its environment.A kingdom is one of the broadest classifications in biological taxonomy, which groups together organisms that share certain characteristics.According to the vsepr theory, which shape represents the molecule, cf4?
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What is the resulting formula unit when strontium (Sr) and phosphorus (P) bond?
Answer: The chemical formula of the compound is [tex]Sr_3P_2[/tex]
Explanation:
Strontium is the 38th element of the periodic table. The electronic configuration of this element is [tex][Kr]5s^2[/tex]
This element will loose 2 electrons to attain stable electronic configuration to attain +2 oxidation state.
Phosphorus is the 15th element of the periodic table. The electronic configuration of this element is [tex]1s^22s^22p^63s^22p^3[/tex]
This element requires 3 electron to attain stable electronic configuration to attain -3 oxidation state.
So, by criss-cross method, the oxidation state of the ions are exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.
Hence, the chemical formula of the compound is [tex]Sr_3P_2[/tex]
In a solution the solute is the substance present in the greatest amount true or false
Answer: False
Explanation:
Binary Solution is a homogeneous mixture of two components called as solute and solvent.
Solute is the component which is present in smaller proportion and is solid for solid in liquid solution and solvent is the component which is present in larger proportion and is liquid for solid in liquid solution.
For example: NaCl in water will have NaCl as solute and will be lesser in amount and water will be solvent and will be greater in amount.
Thus the statement that in a solution the solute is the substance present in the greatest amount is false.
A compound consists of 4.50 g of nitrogen for every 7.71 g of oxygen and has the same empirical and molecular formula identify the compound
Answer:
[tex]N_2O_{3}[/tex]
Explanation:
Hi, the empirical formula is the minimal expression of the molecule composition and doesn't always represent the molecule in the reality.
On the other hand the molecular formula is a multiple of the empirical and represents how the molecule is composed in reality.
In this case they are the same.
Now, nitrogen has an atomic weight of 14 g/mol and oxygen one of 16 g/mol:
[tex]n_{nitrogen}=\frac{4.5g}{14g/mol}[/tex]
[tex]n_{nitrogen}= 0.321mol[/tex]
[tex]n_{oxygen}=\frac{7.715g}{16g/mol}[/tex]
[tex]n_{oxygen}= 0.482mol[/tex]
So the formula would be:
[tex]N_{0.321}O_{0.482}[/tex]
Dividing per 0.321:
[tex]NO_{1.5}[/tex]
In natural numbers:
[tex]N_2O_{3}[/tex]
A 1.25-g sample contains some of the very reactive compound Al(C6H5)3. On treating the compound with aqueous HCl, 0.951 g of C6H6 is obtained.
Al(C6H5)3(s) + 3HCl(aq) --> AlCl3(aq) + 3C6H6(l)
Assuming that Al(C6H5)3 was converted completely to products, what is the weight percent of Al(C6H5)3 in original 1.25-g sample?
By using the reaction and given data, we find that the 1.25 g sample contains approximately 83.9% Al(C₆H₅)₃.
The primary calculations involve moles and molecular weight to determine the mass percentage.
The result shows a high concentration of Al(C₆H₅)₃ in the sample.
To determine the weight percent of Al(C₆H₅)₃ in the original 1.25-g sample, we need to work step-by-step through the given reaction:
Al(C₆H₅)₃ (s) + 3HCl(aq) → AlCl₃(aq) + 3C₆H₆(l)Given that 0.951 g of benzene (C₆H₆) is produced, we can use this information to find the moles of Al(C₆H₅)₃ reacted:
Molecular weight of C₆H₆ = 12(6) + 1(6) = 78 g/mol.Moles of C₆H₆ = 0.951 g / 78 g/mol = 0.0122 mol.From the balanced equation, 1 mol of Al(C₆H₅)₃ produces 3 mol of C₆H₆.So, moles of Al(C₆H₅)₃ = 0.0122 mol / 3 = 0.00407 mol.Next, we calculate the mass of Al(C₆H₅)₃:
Molecular weight of Al(C₆H₅)₃ = 27 (Al) + 3 × (12(6) + 1(5)) (C₆H₅ each) = 27 + 3 × 77 = 258 g/mol.Mass of Al(C₆H₅)₃ = 0.00407 mol × 258 g/mol = 1.049 g.Finally, we calculate the weight percent of Al(C₆H₅)₃ in the original sample:
Weight percent = (1.049 g / 1.25 g) × 100% ≈ 83.9%Therefore, the weight percent of Al(C₆H₅)₃ in the original 1.25-g sample is approximately 83.9%.
Correct question is: A 1.25-g sample contains some of the very reactive compound Al(C₆H₅)₃ .On treating the compound with aqueous HCl, 0.951 g of C6H6 is obtained.
Al(C₆H₅)₃ (s) + 3HCl(aq) --> AlCl₃(aq) + 3C₆H₆(l)
Assuming that Al(C₆H₅)₃ was converted completely to products, what is the weight percent of Al(C₆H₅)₃ in original 1.25-g sample?
A 0.82 kg piece of wood floats in water but is found to sink in alcohol (sg=0.79), in which it has an apparent mass of 0.059 kg .
The balanced equation for combustion in an acetylene torch is shown below: 2C2H2 + 5O2 → 4CO2 + 2H2O The acetylene tank contains 35.0 mol C2H2, and the oxygen tank contains 84.0 mol O2. How many moles of CO2 are produced when 35.0 mol C2H2 react completely?
Final answer:
When 35.0 mol of C2H2 react completely according to the given equation, 70.0 mol of CO2 will be produced.
Explanation:
The student asked about the amount of CO2 produced when 35.0 mol C2H2 reacts completely, according to the balanced chemical equation provided for the combustion of acetylene (C2H2) in an acetylene torch: 2C2H2 + 5O2 → 4CO2 + 2H2O.
To find the amount of CO2 produced, we apply stoichiometry using the balanced equation. According to the equation, 2 moles of C2H2 produce 4 moles of CO2. Therefore, if 35.0 mol C2H2 react completely, the amount of CO2 produced can be calculated by setting up a ratio:
(35.0 mol C2H2) × (4 mol CO2 / 2 mol C2H2) = 70.0 mol CO2
Thus, 35.0 mol of C2H2 will produce 70.0 mol of CO2 when they react completely.
What was Johann Dobereiner's contribution to the development of the periodic table?
He identified triads of elements that had similar properties.
Which subatomic particle did james chadwick discover? compare its mass to that of a proton. presi?
A certain shade of blue has a frequency of 7.26 × 1014 Hz. What is the energy of exactly one photon of this light?
Answer:
Energy of one photon = [tex]4.81\times 10^{-19}J[/tex]
Explanation:
Frequency = [tex]7.26\times 10^{14}\ Hz[/tex]
Energy of a photon is given by:
E = hν
Where,
h = Plank's constant
ν = Frequency
h = [tex]6.626\times 10^{-34}J\ s[/tex]
ν = [tex]7.26\times 10^{14}\ Hz\ or\ 7.26\times 10^{14}\ s^{-1}[/tex]
E = hν
[tex]=(6.626\times 10^{-34}Js)\times (7.26\times 10^{14}\ s^{-1})\\=4.81\times 10^{-19}J[/tex]
Energy of one photon = [tex]4.81\times 10^{-19}J[/tex]
Final answer:
The energy of a photon of blue light with a frequency of 7.26 × 10¹⁴ Hz is approximately 4.81 × 10⁻¹⁹ joules, calculated using Planck's formula E = hf.
Explanation:
The energy of exactly one photon of light with a frequency of 7.26 × 10¹⁴ Hz can be calculated using the formula E = hf, where E is the energy in joules, h is Planck's constant (6.626 × 10⁻³⁴ J·s), and f is the frequency in hertz. Substituting the given values into the formula:
E = (6.626 × 10⁻³⁴ J·s) × (7.26 × 10¹⁴ Hz)
This results in an energy of 4.81 × 10⁻¹⁹ J per photon. Thus, a blue photon with a frequency of 7.26 × 10¹⁴ Hz has an energy of approximately 4.81 × 10⁻¹⁹ joules.
Which element has six energy levels
The formula for common table salt is nacl. what elements are in table salt? use the periodic table (given in last lesson) if necessary.
Final answer:
Table salt, or sodium chloride (NaCl), is made up of sodium and chlorine elements in a 1:1 ratio, forming an ionic compound that is stable and mostly unreactive unlike its individual reactive elements.
Explanation:
The formula for common table salt is NaCl, indicating that table salt is composed of two elements: sodium and chlorine. These elements react to form sodium chloride, the chemical name for table salt. This compound is an ionic compound, meaning it is made of sodium ions (Na+) and chloride ions (Cl-), which are held together by ionic bonds. The reaction to form table salt is highly exothermic, releasing a significant amount of light and heat. The resulting compound has a formula mass of 58.44 amu, illustrating its stable, ionic structure in a 1:1 ratio of sodium to chloride ions. This stability is what makes table salt a mostly unreactive compound, unlike its highly reactive constituent elements, sodium, a very reactive metal, and chlorine, a corrosive gas.
The reaction described in part a required 3.77 l of magnesium chloride. what is the concentration of this magnesium chloride solution?
The concentration of the magnesium chloride solution is 0.265 M.
What is concentration?Molarity or concentration is the measure of the concentration of any solute per unit volume of the solution. Molarity or concentration is calculated by dividing the number of moles by the volume of the solution.
Volume is the space occupied by a three-dimensional object. Volume is calculated by dividing mass by density.
M = {n}{V}
Given, the volume of magnesium chloride is 3.77 l
The moles of the magnesium chloride is considered as 1
The formula of molarity is n / V
Assuming you are talking about the atomic mass of magnesium chloride
Putting the values in the equation
M = n/V
M = 1/3.77
M = 0.265
Therefore, the concentration or molarity of magnesium chloride is 0.265 M.
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Whether calculating speed or acceleration, this data is required
a. velocity
b.time
c.acceleration
d.deceleration
the awncer is B. Time
Which could make up a solution?
Check all that apply.
A. A gas in a liquid
B. Two gases
C. Two solids
D. A solid in a liquid
A nuclear waste site. cesium-137 is a particularly dangerous by-product of nuclear reactors. it has a half-life of 30 years. it can be readily absorbed into the food chain and is one of the materials that would be stored in the proposed waste site at yucca mountain (see the article opening this section). suppose we place 3000 grams of cesium-137 in a nuclear waste site.how much cesium-137 will be present after 60 years, or two half-lives?
I don’t understand this, can you help me?
Human activities can accelerate the process of
A) physical weathering
B) chemical weathering
C) both
Human activities can indeed accelerate the process of both physical and chemical weathering. Option C) is the correct answer.
Explanation:Physical weathering involves the degradation of rock through physical processes, such as freeze-thaw cycles or abrasion. Chemical weathering, on the other hand, involves the decomposition of rock through chemical reactions, such as oxidation and hydration.
Human activities, such as deforestation, mining, and construction, can accelerate these processes. For instance, the removal of trees (deforestation) can lead to more intense freeze-thaw cycles, accelerating physical weathering. Mining, meanwhile, exposes more rock to air and water, facilitating chemical reactions and thus speeding up chemical weathering.
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I REALLY NEED HELP
Question 1 (1 point) Question 1 Unsaved
Orbitals are defined by which of the following?
Question 1 options:
number of electrons
spin direction
energy level
composition
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Question 2 (1 point) Question 2 Unsaved
An atom has 14 protons and 14 neutrons. What is the chemical symbol for the atom? Consult the periodic table.
Question 2 options:
Al
Cr
Mg
Si
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Question 3 (1 point) Question 3 Unsaved
An atom has an average atomic mass of about 63.5 amu. What is the chemical symbol for the atom? Consult the periodic table.
Question 3 options:
Pb
Cu
Eu
Fe
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Question 4 (1 point) Question 4 Unsaved
An atom has a charge of –3 in its orbitals. Which statement must be true in order for this atom to have no net charge?
Question 4 options:
There are three neutral neutrons in the nucleus.
There are three positively charged protons in the nucleus.
There are two positively charged protons in the nucleus and one in an orbital.
There are three positively charged protons outside the nucleus.
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Question 5 (1 point) Question 5 Unsaved
The number of protons in the nucleus of an atom is equivalent to which of the following?
Question 5 options:
mass number
atomic weight
atomic number
number of neutrons
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Question 6 (1 point) Question 6 Unsaved
You heat two substances, A and B. Both substances change color. When cooled, substance A returns to its original color, but substance B does not. What most likely happened?
Question 6 options:
A chemical change occurred in both substances.
A chemical change occurred in substance A, and a physical change occurred in substance B.
A physical change occurred in both substances.
A physical change occurred in substance A, and a chemical change occurred in substance B.
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Question 7 (1 point) Question 7 Unsaved
A material has a density of 8.9 g/cm3. You have six cubic centimeters of the substance. What is the material's mass in grams?
Question 7 options:
5.9 g
107 g
3.0 g
53 g
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Question 8 (1 point) Question 8 Unsaved
Which of the following describes an element?
Question 8 options:
C2H6
H2O2
CuSO4
CI2
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Question 9 (1 point) Question 9 Unsaved
Which of the following goes on the x-axis of a graph?
Question 9 options:
trend line
independent variable values
graph title
dependent variable values
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Question 10 (1 point) Question 10 Unsaved
A container has the dimensions of 30 cm x 50 mm x 0.2 m. The density of its contents is 2.5 g/cm 3. What is the mass of the substance in kilograms? ( D = m/V)
Question 10 options:
150 kg
75 kg
0.75 kg
7.5 kg
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