Answer:- The limiting reactant is HCl.
Explanation: The balanced equation is:
[tex]2HCl+Ca\rightarrow CaCl_2+H_2[/tex]
It's a stoichiometry problem. Masses of both the reactants are given and the questions asks to find out the limiting reactant.
We convert the given grams of each reactant to moles on dividing by its molar mass. Now, we can calculate the moles of any of the product on multiplying the moles of the reactant by mole ratio.
We do this starting with both the reactants and see which one gives less number of moles of the product. The limiting reactant is the one giving least number of moles of the product.
Molar mass of HCl is 36.46 gram per mol and that of Ca is 40.08 gram per mol.
Let's say we calculate the moles of hydrogen gas produced in the reaction. Mole ratio of [tex]H_2[/tex] to HCl is 1:2 and the mole ratio of [tex]H_2[/tex] to Ca is 1:1 .
The calculations are as shown below:
[tex]100gHCl(\frac{1molHCl}{36.46gHCl})(\frac{1molH_2}{2molHCl})[/tex]
= 1.37 mol [tex[H_2[/tex]
[tex]100gCa(\frac{1molCa}{40.08gCa})(\frac{1molH_2}{1molCa})[/tex]
= 2.50 mol [tex]H_2[/tex]
From above calculations, we get the least moles of hydrogen gas from 100 grams of HCl. So, the limiting reactant is HCl.
The elements at the bottom of the table were pulled out to keep the table from becoming too long. these are called the
Isotopes have the same ____________ but have a new atomic mass because they _________________. *
Number of electrons; have more or less neutrons
Number of protons; have more or less neutrons
Number of protons; have more or less electrons
Number of electrons; have more or less protons
Answer:
Isotopes have the same number of protons but have a new atomic mass because they have more or less neutrons.
Hope this helps!
What is the standard unit used to measure mass?
cubic meters
gram
liter
meter
Answer:
Gram (g)
Explanation:
technically, it is the kilogram (kg), which is made of grams.
Select all of the answers that apply. Without its atmosphere, Earth would be _____. warmer bombarded by meteorites similar to Mars relatively lifeless
The answer is B, C and D
Explain how the quantum mechanical model of the atom describes the electron structure of an atom
According to the model electrons in the same atom with the same principal quantum number (n) or primary energy level are said to occupy an atom's electron shell.
What is quantum mechanical model?Quantum mechanical model is defined as the possibilities of inserting electrons within an atom by describing the principal energy level, energy level, orbital energy level, and orbital energy level.
Quantum mechanics is defined as a fundamental theory of physics that describes the physical aspects of nature at the atomic and subatomic particle scales.
Electrons are defined as the negatively charged subatomic particles that together with protons and neutrons forms an atom.
Protons are positively charged in nature, while neutrons are neutral in nature.
Thus, according to the model electrons in the same atom with the same principal quantum number (n) or primary energy level are said to occupy an atom's electron shell.
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True or false a mixture is made of two or more elements that are chemically combined
If helium had exactly the same mass as four hydrogen atoms, the luminosity o f the sun would be
Final answer:
If helium had the same mass as four hydrogen atoms, there would be no mass loss to energy during fusion, leading to a significant decrease or absence of the Sun's luminosity from this process.
Explanation:
If helium had exactly the same mass as four hydrogen atoms, the luminosity of the sun would be different because the mass-energy conversion in the nuclear fusion process would be altered. Currently, during the conversion of hydrogen to helium, a small fraction of mass is converted into energy according to the mass-energy equivalence principle (E=mc²). This mass loss is what contributes to the Sun's luminosity. The mass loss per reaction is about 0.7 percent of the rest energy of the original hydrogen.
The Sun currently burns approximately 630 million metric tons of hydrogen into helium each second to produce its luminosity of 4 × 10²⁶ watts. If helium and four hydrogen atoms had the same mass, no mass would be converted to energy, implying there would be no luminosity deriving from this process. However, in reality, the presence of a mass defect allows for the release of energy during fusion. The complex relationship between mass and luminosity can be expressed by the approximation L ∼ M³°⁹, where 'L' represents luminosity and 'M' the mass.
In conclusion, if helium had exactly the same mass as four hydrogen atoms, there would be no mass converted to energy during the fusion process, leading to a significant decrease in the Sun's luminosity or possibly no luminosity at all from this source of energy. This would fundamentally change the energetic balance and life cycle of the Sun.
What is the difference between the 3p sublevel and the 4p sublevel?
On the periodic table
Answer:
Here look
Explanation:
What are multiple things combined to produce a product that is different from the parts that are used to make it
Consider the ionic compound magnesium acetate. How many electrons does the magnesium ion have
Final answer:
A magnesium ion (Mg2+) has 10 electrons after losing 2 valence electrons to achieve a stable electron configuration, resembling the noble gas neon.
Explanation:
The question asks about the number of electrons in a magnesium ion found in magnesium acetate. In the process of forming an ion, a magnesium atom, which normally has 12 electrons, loses two electrons to achieve a stable electronic arrangement, resembling that of the noble gas neon. This loss of electrons results in the formation of a magnesium ion with a 2+ charge, denoted as Mg2+. Therefore, a magnesium ion possesses 10 electrons.
Magnesium's behavior exemplifies a typical property of metals in which they lose electrons to form positive ions or cations. This is consistent across various magnesium compounds, whether it forms magnesium acetate with acetate anions or magnesium oxide with oxide anions, illustrating the metallic character of magnesium in forming cations through the loss of its valence electrons.
Since the beginning of time, some people have believed that the Earth is flat. Beginning around 300 B.C., however, some began to wonder if the Earth is actually spherical in shape. Those that favored the flat Earth theory made the following observations: The Earth is stable because it is a flat landmass sandwiched between a flat layer of air and a flat layer of water. If the Earth is spherical, then oceans should be curved on top, but they aren't. Some rivers flow for hundreds of miles but only fall a few feet. The rivers should fall farther if the Earth is spherical. If the Earth is spherical, people and animals that inhabit the Earth would notice as they walked along its surface. Since mariners are able to use flat compasses to navigate their ships without crashing, the Earth must not be a sphere. Those that disputed the flat Earth theory countered the claim by observing that Christopher Columbus was able to sail around the Earth without falling off the edge and later, by presenting satellite imagery taken from space of a spherical Earth. This example demonstrates that
A. scientific knowledge is unattainable.
B. argumentation is a necessary part of scientific inquiry.
C. it is easy to resolve a scientific argument.
D. it is not possible to settle a dispute.
This example demonstrates that argumentation is a necessary part of scientific inquiry and the correct option is option B.
As new experiments are conducted and data is gathered, it can challenge or refine existing theories, leading to updates in scientific knowledge.
Technological advancements also play a role in driving change, as they provide scientists with new tools and methods to explore and observe the natural world.
Additionally, scientific debates and discussions within the scientific community contribute to the evolution of knowledge, as different perspectives and interpretations are considered.
Thus, the ideal selection is option B.
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If a sample containing 2.50 ml of nitroglycerin (density=1.592g/ml) is detonated, how many total moles of gas are produced?
An ion from a given element has 22 protons and 18 electrons. what is the charge on the ion?
The charge on the ion is +4.
What is an ion?An ion is an atom or group of atoms where the number of electrons are not equal to the number of protons. To put it in a simple words, when a stable atom gains or loses an electron, it becomes an ion. Examples of ions are as follows: H+,Na+,Ca2+,F−,O2−For a single atom, the charge is the number of protons minus the number of electrons.
Charge = Proton - electron
= 22 - 18
= +4
Hence, the charge on the ion is +4.
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Oxygen, with an atomic number of 8, is a neutral atom and would have ___________ electrons in the first electron shell and _________ electrons in the second electron shell
Oxygen, with an atomic number of 8, is a neutral atom and would have two electrons in the first electron shell and six electrons in the second electron shell.
What is the atomic number?The quantity of protons in an atom's nucleus is known as the atomic number. The number of protons determines an element's identity (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
The number of protons in an atom is the atomic number. It is sometimes referred to as the proton number for this reason. The capital letter Z is used to represent it in calculations.
Therefore, with an atomic mass of 8, oxygen is a neutral atom that has two electrons in its outermost electron shell and six in its outermost electron shell.
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Why isn't the atomic mass of most of the elements on the periodic table a whole number?
What is the bond type of CaO
What elements are formed by stars having a mass greater than eight suns?
Stars having a mass greater than eight suns produce elements as heavy as iron through nucleosynthesis. They also eject matter into space in their dying stage, making way for new stars. Elements heavier than iron are synthesized during supernova explosions when these stars exhaust their nuclear fuel.
Explanation:Stars having a mass greater than eight suns are capable of forming elements as heavy as iron through a process known as nucleosynthesis. In these stars, nuclear reactions involving carbon, oxygen, and heavier elements can build up nuclei up to that of iron. Eventually, these stars exhaust their energy supplies and in the process of dying, some matter, enriched in heavy elements, is ejected into interstellar space. This matter forms the foundation for new stars, with each succeeding generation containing a larger proportion of elements heavier than hydrogen and helium. Specifically, such massive stars can ignite further fusion reactions, transforming carbon into oxygen, neon, magnesium, and silicon until iron is ultimately formed. However, elements heavier than iron are synthesized during spectacular explosions called supernovas, which occur when these stars finally exhaust their nuclear fuel.
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Elements heavier than iron are formed through nucleosynthesis in stars with masses greater than 8 solar masses.
Explanation:In stars with masses greater than about 8 solar masses, elements heavier than iron can be formed through nucleosynthesis, a process in which nuclear reactions build up nuclei. The outer layers of these massive stars compress the carbon-oxygen core, leading to the fusion of carbon nuclei and the production of heavier elements like silicon and iron.
Elements formed by stars include hydrogen and helium, which were produced during stellar nucleosynthesis. Heavier elements, such as carbon, oxygen, and beyond, are formed through fusion processes within stars during their lifecycle. However, iron is the endpoint of this process, as fusion of iron atoms requires energy rather than releasing it.
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Which is the element with the highest electronegativity value? (1 point) cesium helium calcium fluorine?
Fluorine is the element with the highest electronegativity value due to its strong ability to accept electrons and complete its outer shell. This trait makes it highly reactive and common as a negatively charged fluoride ion.
Explanation:The element with the highest electronegativity value is fluorine. Electronegativity is a measure of the ability of an atom to attract shared electrons in a chemical bond. Fluorine has an extremely high electronegativity value due to its small size and the fact it has seven electrons in its outer shell. This makes it highly likely to bond with other atoms so that it can gain the one electron it needs to reach a full outer shell of eight electrons. This ability to accept electrons easily also causes fluorine to have a high Electron Affinity (EA) value.
Fluorine's tendencies to attract electrons is also reflected in its common occurrence as a fluoride ion (F-), an anion with a negative charge due to the additional electron it has gained. This behaviour is also seen in the other elements in fluorine's family, the halogens, which readily accept an extra electron and are highly reactive chemically.
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Explain why neon is monatomic but chlorine is diatomic
When a phosphate group is added to a molecule, that molecule is said to have been?
When a phosphate group is added to a molecule, the molecule has been phosphorylated, a process that facilitates chemical reactions, alters protein functions, changes molecular polarity, and is involved in energy storage and release within the cell.
Explanation:When a phosphate group is added to a molecule, that molecule is said to have undergone a process called phosphorylation. This is a common biochemical process where phosphorylation refers to the attachment of a phosphate to another molecule to facilitate a chemical reaction. There are many instances where this occurs in the cell. For example, protein phosphorylation often occurs on residues of the amino acids serine, threonine, or tyrosine, and is facilitated by an enzyme called kinase. Another example is when a phosphate group is transferred from ATP (adenosine triphosphate) to a molecule like glucose, creating a phosphorylated form such as glucose phosphate which can be stored or metabolized for energy.
The addition of a phosphate group often results in a change in the function of the protein, frequently resulting in an activation or deactivation of its activity. Additionally, the inclusion of a phosphate group increases the polarity of the molecule, making it a more polar molecule, which can alter its interactions and stability within the cell. The attachment of the phosphate group typically requires energy, and the cleavage of a phosphate group from ATP, a process called dephosphorylation, releases energy.
How does the mass number of an element differ from its average atomic mass?
Trouton's rule does not apply to water because in the liquid, water molecules are held together by an extensive network of hydrogen bonds. provide a molecular interpretation for the observation that trouton's rule underestimates the value of the entropy of vaporization of water
the molecular interpretation is not suitable for the assumption that there are much more interactions in the intermolecular level
We must account for the breaking/creation of hydrogen bondings, which is not the scope of the equilibria made in trouton's analysis
Calculate the formula mass for the compound tin(iv) sulfate. express your answer using five significant figures.
The formula mass of tin(iv) sulfate is 310.83g/mol. Details about formula mass can be found below.
How to calculate formula mass?The formula mass of a compound can be calculated by summing the atomic masses of the element that make it up.
According to this question, tin(iv) sulfate is the given compound. The chemical formula of tin (IV) sulfate is Sn(SO4)2.
Atomic mass of Sn = 118.71g/molAtomic mass of S = 32g/molAtomic mass of O = 16g/mol118.71 + [32 + 16(4)]2
= 310.83g/mol
Therefore, the formula mass of tin(iv) sulfate is 310.83g/mol
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The formula mass of tin(IV) sulfate (Sn(SO₄)₂) is approximately 310.83 g/mol, expressed with five significant figures .
To calculate the formula mass of tin(IV) sulfate, sum the atomic masses of its constituent atoms: tin, sulfur, and oxygen.
The total formula mass is 310.83 g/mol. This calculation includes atomic masses for one tin atom, two sulfur atoms, and eight oxygen atoms.To calculate the formula mass of tin(IV) sulfate (Sn(SO₄)₂), we need to sum the atomic masses of all the atoms in its chemical formula.Using the atomic masses rounded to two decimal places:
Tin (Sn): 118.71 g/molSulfur (S): 32.07 g/molOxygen (O): 16.00 g/molThe chemical formula Sn(SO₄)₂ indicates one tin atom, two sulfur atoms, and eight oxygen atoms. The computation is as follows:
Formula Mass Calculation:
Tin: 1 x 118.71 g/mol = 118.71 g/molSulfur: 2 x 32.07 g/mol = 64.14 g/molOxygen: 8 x 16.00 g/mol = 128.00 g/molTotal Formula Mass:
118.71 g/mol + 64.14 g/mol + 128.00 g/mol = 310.83 g/mol
Therefore, the formula mass for tin(IV) sulfate is 310.83 g/mol.
Zinc has a mass of 4.50g calculate the volume
The volume of given amount of zinc will be 0.631 cm³.
What is the relation between the mass and density of a solid body?
The relation between the mass and density of any solid is given by -
M = dV
where -
[M] is the mass
[d] is density
[V] is volume
Given is Zinc that has a mass of 4.50 g.
We can write -
Mass of zinc = [M] = 4.5 g
Density of zinc = [d] = 7.13 g/cm³
Therefore, the volume of given amount of zinc will be -
V = M/d
V = 4.5/7.13
V = 0.631 cm³
Therefore, the volume of given amount of zinc will be 0.631 cm³
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Final answer:
To find the volume of the zinc sample weighing 4.50g, divide the mass by the density of zinc (7 g/cm³), resulting in a volume of approximately 0.643 cm³.
Explanation:
To calculate the volume of a sample of zinc with a mass of 4.50g, we need to know the density of zinc. From the provided examples, we can determine that the density of zinc is effectively 7 g/cm³ (since if 1 cm³ of zinc has a mass of about 7 grams).
Using the formula density = mass/volume, we can find the volume by rearranging the formula to volume = mass/density. Plugging in the numbers, we get:
volume = 4.50 g / 7 g/cm³ = 0.643 cm³ (approximately)
Therefore, the volume of the 4.50g sample of zinc is approximately 0.643 cm³.
It's important to think about your result and ensure it's reasonable. Given the mass and density, a volume of 0.643 cm³ for zinc is consistent with its known physical properties.
Zn + FeCl3 -> ZnCl2 + FeCl2
Final answer:
In the given chemical equation, zinc (Zn) is being oxidized and iron (Fe) is being reduced. The balanced ionic equation for the reaction is Zn + 2Fe^3+ -> Zn^2+ + 2Fe^2+.
Explanation:
In the given chemical equation:
Zn + FeCl3 -> ZnCl2 + FeCl2
It is a redox reaction where zinc (Zn) is being oxidized and iron (Fe) is being reduced.
The zinc (Zn) loses electrons and is oxidized from its elemental state to the +2 oxidation state in zinc chloride (ZnCl2). The iron (Fe) gains electrons and is reduced from the +3 oxidation state in iron(III) chloride (FeCl3) to the +2 oxidation state in iron(II) chloride (FeCl2).
The balanced ionic equation for the reaction is:
Zn + 2Fe^3+ -> Zn^2+ + 2Fe^2+
An upright cylindrical tank with radius 6 m is being filled with water at a rate of 2 m3/min. how fast is the height of the water increasing?if h is the water's height, the volume of the water is v = πr2h. we must find dv/dt. differentiating both sides of the equation gives
The problem of determining how quickly the water level is rising in an upright cylindrical tank can be solved by identifying the rate of change of volume (dv/dt) and differentiating the volume equation relative to time.
Explanation:The problem is about the rate of increase in the height of water in a cylindrical tank. As specified, if v = πr²h represents the volume of the water where r is the tank's radius and h is the water's height, then the rate of volume change dv/dt would differentiate the volume equation relative to time.
As the tank is cylindrical and upright, its radius does not change over time. Consequently, we differentiate the volume function with respect to time to find dv/dt = πr²dh/dt, where dh/dt represents how fast the water's height is increasing.
We are given dv/dt is equal to 2 m³/min since the water is filling at a rate of 2 m³/min. When we substitute the values and solve for dh/dt, we find the rate of increase of the height of water.
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Explain why a piece of aluminum or magnesium can be used to remove tarnish, which is mostly silver sulfide, on silverware.
What type of solid is this? This solid has high melting point, does not conduct electricity, and does not dissolve in water. Metallic, network, molecular, ionic, or amorphous?
The solid described, with a high melting point, non-conductivity, and insolubility in water, is a covalent network solid.
Based on the properties presented - high melting point, non-conductive of electricity, and insolubility in water - the type of solid being described is most likely a covalent network solid. Covalent network solids are characterized by their strong covalent bonds that form a network throughout the solid, leading to very high melting points. They are typically hard and brittle, do not conduct electricity since there are no free-moving electrons or ions, and do not dissolve in water because their molecules are not easily separated from the network.
The eu(iii) standards added to the groundwater sample contained 0.168 ng/ml (ppb) of eu(iii). calculate the concentration of eu(iii) in the groundwater sample.
Without specific data on Eu(III) measurements and sample treatment, we cannot calculate its concentration in the groundwater sample. Typically, standard addition or a calibration curve would be used. For other examples, such as mercury in wastewater, ppm and ppb are calculated using the solute's weight and the sample's weight.
Explanation:To determine the concentration of Eu(III) in the groundwater sample, we would typically use a procedure similar to the one used for analyzing the concentration of other ions like nitrate (NO3). We might use techniques such as standard addition or a calibration curve using an ISE (ion-selective electrode), CZE (capillary zone electrophoresis), or another analytical method. However, without additional information such as the volume of groundwater sample, potential measurements, standard concentrations, and dilution factors, it is not possible to calculate the concentration of Eu(III) in the sample with the data provided.
One common approach is demonstrated in the NO3 example provided: In a one-point standard addition method, a known amount of a standard solution is added to the sample, and the change in an analytical signal (e.g., potential for an ISE) is measured. This is used to calculate the concentration of the target analyte in the original sample. Without similar data points for the Eu(III) analysis, the concentration in the groundwater sample cannot be determined from the information provided.
In the case of the example where mercury concentration is to be expressed in ppm and ppb, it is a straightforward calculation based on the weight of mercury and the weight of the sample. Parts per million (ppm) and parts per billion (ppb) are units of concentration that represent the ratio of solute to solution. To convert milligrams to grams and then compute ppm and ppb, we need to use the provided weights.
For instance, to calculate the concentration in ppm and ppb, given a 50.0-g industrial wastewater sample contains 0.48 mg of mercury:
Convert milligrams of mercury to grams: 0.48 mg = 0.48 × 10−3 gCalculate ppm (parts per million): (0.48 × 10−3 g / 50.0 g) × 106 = 9.6 ppmCalculate ppb (parts per billion): (0.48 × 10−3 g / 50.0 g) × 109 = 9600 ppb
What are 3 signs that a chemical change (chemical reaction) has taken or is taking place?