A compound is a substance composed of two or more different atoms chemically bonded to one another, for example, water (H₂O) consists of 2 atoms of hydrogen (H) and 1 atom of oxygen (O), so it is the compound. Water is created by chemical reaction:
2H₂ + O₂ → 2H₂O
what particles in an,atom determine an elements atomic number and identity?
HELLLLLLLLLLLLP ME PLS 10 points pls
What do the symbols in parenthesis indicate?
CaCl2(aq) + 2AgNO3(aq)) → Ca(NO3)2(aq) + 2AgCl(s)
1 the catalyst used in the reaction
2 the number of atoms of each reactant and product
3 the physical state of each reactant and product
4 the number of units of each reactant and product
How many valence electrons do noble gases have?
1 or 2
2 or 8
2 or 3
8
Monel metal is a corrosion-resistant copper-nickel alloy used in the electronics industry. A particular alloy with a density of 8.80 g/cm3 and containing 0.073% Si by mass is used to make a rectangular plate that is 15.0 cm long, 12.5 cm wide, and 2.50mm thick and has a 2.50-cm-diameter hole drilled through its center such that the height of the hole is 2.50mm .
The silicon in the plate is a mixture of naturally occurring isotopes. One of the those isotopes is silicon-30, which has an atomic mass of 29.97376 amu and a percent natural abundance of 3.10%
How many silicon-30 atoms are found in this plate?
Express your answer numerically using two significant figures.
The number of silicon-30 atoms in the plate can be calculated using the concept of percent abundance and Avogadro's number. Plugging in the given values, the calculated number of silicon-30 atoms is approximately 4.59 x 10^19.
The number of silicon-30 atoms in the plate can be calculated using the concept of percent abundance and Avogadro's number.
First, we need to determine the mass of the silicon-30 in the plate.
The mass of silicon in the plate can be found by multiplying the mass of the plate by the mass fraction of silicon:
Mass of silicon = Mass of plate x Mass fraction of silicon = (Volume of plate x Density of plate) x Mass fraction of silicon
Next, we can calculate the number of moles of silicon-30:
Number of moles of silicon-30 = Mass of silicon / molar mass of silicon-30
Finally, we can convert the number of moles into the number of atoms using Avogadro's number:
Number of silicon-30 atoms = Number of moles of silicon-30 x Avogadro's number
Plugging in the values, we get:
Number of silicon-30 atoms = (Volume of plate x Density of plate x Mass fraction of silicon) / molar mass of silicon-30 x Avogadro's number
Now, let's calculate the values:
Volume of plate = Length x Width x Thickness - Area of hole x Height of hole
Area of hole = π x (Diameter of hole / 2)^2
Plugging in the values, we get:
Volume of plate = (15.0 cm x 12.5 cm x 2.50 mm) - (π x (2.50 cm / 2)^2 x 2.50 mm)
Now, we can substitute the calculated values into the formula to find the number of silicon-30 atoms:
Number of silicon-30 atoms = ((15.0 cm x 12.5 cm x 2.50 mm) - (π x (2.50 cm / 2)^2 x 2.50 mm) x 8.80 g/cm^3 x 0.073% Si) / (29.97376 g/mol) x (0.0310)
Calculating this expression gives approximately 4.59 x 10^19 silicon-30 atoms in the plate.
Final answer:
By calculating the mass of the Monel plate, the mass of silicon within it using the percent composition, and applying the natural abundance of silicon-30, we find approximately 1.9 × 10²⁰ silicon-30 atoms in the plate.
Explanation:
To calculate the number of silicon-30 atoms in a Monel metal plate with a density of 8.80 g/cm³ that measures 15.0 cm by 12.5 cm and is 2.50 mm thick, having a hole of 2.50 cm diameter, we need to follow these steps:
Determine the volume of the plate (including the hole).
Calculate the mass of the plate using its density.
Find the mass of silicon in the plate using the percent composition.
Calculate the number of moles of silicon based on its mass.
Use the percent natural abundance of silicon-30 to find the moles of silicon-30 specifically.
Use Avogadro's number to convert moles of silicon-30 to the number of atoms.
Let's perform the calculation:
Volume of plate without the hole = (15.0 cm × 12.5 cm × 0.25 cm) = 46.875 cm³
Volume of the hole = (π × (1.25 cm)²) × 0.25 cm = 1.227 cm³
Total volume = 46.875 cm³ - 1.227 cm³ = 45.648 cm³
Mass of plate = Density × Volume = 8.80 g/cm³ × 45.648 cm³ = 401.7 g
Mass of Si in plate = 401.7 g × 0.00073 = 0.293 g
Moles of Si = Mass / Molar mass = 0.293 g / 28.085 g/mol = 0.01044 mol
Moles of Si-30 = Total moles of Si × Percent abundance of Si-30 = 0.01044 mol × 0.0310 = 0.0003236 mol
Number of Si-30 atoms = Moles of Si-30 × Avogadro's number = 0.0003236 mol × 6.02 × 10²³ atoms/mol
The number of silicon-30 atoms in the plate is approximately 1.9 × 10²⁰ atoms, rounded to two significant figures.
How many times does the moon rotate on its axis in one month
what is the name given to the electrons in the highest occupied energy level of an atom
A molecule of carbon dioxide (CO2) contains two polar covalent bonds. Why is the molecule nonpolar?
Answer:
The molecule has a symmetrical distribution of charge.
Explanation:
A CO2 molecule is nonpolar because the molecule is linear and has a symmetrical distribution of charge as seen in this diagram:
What is the most basic building block of matter?
Question 2 options:
the atom
the quark
the electron
the proton
: The Atom
~Sarah Robinsen
Which is the electron configuration for bromine?
Electron configuration:
The arrangement of electrons in an atom by a superscript, in each sublevel is known as electron configuration. For example the d block elements have (n-1)d1-10 ns1-2 electronic configuration
The atomic number if bromine is 35 thus there are 35 electrons present which fill accorindg to the Hund’s rule and aufbau principle a follows:
Br-35 1s22s22p63s23p64s23d104p5
Or [Ar] 4s23d104p5
______is a mixture dead organic material that can be used as fertilizer
Answer:
Compost is a mixture dead organic material that can be used as fertilizer
Explanation:
Compost is a natural organic fertilizer that is prepared with different organic materials, providing nutrients and improving soil structure. Compost converts waste into fertilizer and valuable organic matter for soils.
The transformation of organic matter is carried out with composting, that is, the controlled decomposition of organic materials. Among them are fruits, pruning remains, vegetables, among others. The result of this procedure is a completely organic product that improves the soil structure and provides the necessary nutrients to the soil, all naturally.
Compost has a wide variety of advantages. Among them, it can be mentioned that urban waste is reduced considerably because it minimizes environmental problems related to its treatment and transportation. The soil structure will also be improved, helping with water retention, ventilation and the possible effects of frost. And the earth will eventually contain more organic matter and more nutrients; and it is possible to avoid the use of chemical fertilizers that can negatively affect the soil or the health of people. In addition, the lack of these substances produces an increase in the amount of microorganisms beneficial to the life cycle. Earthworms and other organisms will aerate the earth, prevent it from composting and favor the roots of plants.
So, "compost is a mixture dead organic material that can be used as fertilizer"
Since most sources of noise pollution are caused by essential machines, it is not possible to decrease the levels of sound.
True
False
25) One canned juice drink is 15% orange juice; another is 5% orange juice. How many liters of each should be mixed together in order to get 10L that is 12% orange juice.
...?
what is the molar mass of AuCl3
Answer:
303.32557 g/mol.
Explanation:
Gold III Chloride is also known as acid gold trichloride.
PROPERTIES OF GOLD III CHLORIDE,AuCl3:
Gold III Chloride exist in colour appearance of Red crystals,and yellow crystals. It has a melting point of 254 °C and a density of
4.7 g/cm3. AuCl3 exist as a dimer( Au2Cl6) and it is somewhat covalent.
Molar mass is the the mass of one mole of a substance and is expressed in g/mol. Gold atomic mass is 196.96657, chlorine has 35.453.
Hence, molar mass of AuCl3= atomic number of Gold + atomic mass of chlorine × (number of atoms of chlorine in AuCl3).
Molar mass of AuCl3 = 196.96657 + (35.453 × 3). = 196.96657 + 106.359.
Molar mass of AuCl3= 303.32557 g/mol.
The molar mass of compound AuCl₃is 303.32557 g/mole.
Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
Molar mass of AuCl₃ = 196.96657 + (35.453 × 3). = 196.96657 + 106.359.
Molar mass of AuCl₃= 303.32557 g/mol.
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what's the name for the phase change from solid to gas
Predict the products of the following reaction: Ba+P The equation may not be correctly balanced. Express your answers as chemical formulas separated by a comma. If no reaction occurs, enter noreaction.
What is the mass of 5.05×1021 platinum atoms?
Answer: 1.6 gram
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given atoms}}{\text {Avogadro's Number}}[/tex]
[tex]\text{Number of moles of water}=\frac{5.05\times 10^{21}}{6.023\times 10^{23}}=8.4\times 10^{-3}moles[/tex]
1 mole of Platinum [tex]Pt[/tex] weighs 195 g
[tex]8.4\times 10^{-3}moles[/tex] of Platinum [tex]Pt[/tex] weigh =[tex]\frac{195}{1}\times 8.4\times 10^{-3}=1.6g[/tex]
Thus mass of [tex]5.05\times 10^{21}[/tex] platinum atoms is 1.6 gram.
Final answer:
To calculate the mass of 5.05×10²¹ platinum atoms, first find the number of moles using Avogadro's number, then multiply by the atomic mass of Pt, yielding approximately 1.636 grams of Pt.
Explanation:
To determine the mass of 5.05×10²¹platinum atoms, we need to use Avogadro's number (6.022×10²³ atoms/mol) and the atomic mass of platinum (Pt), which is approximately 195 g/mol. First, we calculate the number of moles of platinum atoms:
Number of moles = Number of atoms / Avogadro's number
Number of moles= 5.05×10²¹Pt atoms / 6.022×10²³ Pt atoms/mol
= 8.39×10⁻³ mol Pt
Next, we find the mass of the platinum atoms by multiplying the number of moles by the atomic mass of platinum:
Mass = Number of moles × Atomic mass of Pt
= 8.39×10⁻³ mol Pt × 195 g/mol
= 1.63605 g of Pt
Therefore, the mass of 5.05×10²¹ platinum atoms is approximately 1.636 g.
A student balanced the chemical equation Mg + O2 →MgO by writing Mg + O2 → MgO2. Was the equation balanced correctly? Explain your answer. If the equation was not balanced correctly, write the correctly balanced equation.
Explanation:
Charges on both magnesium and oxygen is 2. Though opposite in sign, they have equal charges so, both of them will be cancelled by each other.
As a result, formula of magnesium oxide is MgO and not [tex]MgO_{2}[/tex].
The student write the equation as [tex]Mg + O_2 \rightarrow MgO_2[/tex], it is not correct.
Therefore, given equation will be balanced as follows.
[tex]2Mg + O_{2} \rightarrow 2MgO[/tex]
Since, number of atoms on both reactant and product side are equal. Hence, this equation is completely balanced.
No, the equation [tex]Mg + O2 -- MgO2[/tex]is not balanced correctly. The correct balanced equation is
[tex]2Mg + O2 -- 2MgO.[/tex]
Explanation:A balanced chemical equation is a symbolic representation of a chemical reaction that ensures the conservation of mass and charge. It shows the reactants on the left side and the products on the right side, with coefficients indicating the relative quantities of substances involved to satisfy the law of conservation of matter.
The given chemical equation is not balanced correctly. To balance this equation, we need to ensure that there is an equal number of each element on both the reactant and product sides. In the unbalanced equation, there is one magnesium atom on the reactant side and two oxygen atoms on the product side. To balance it, we need to put a coefficient of 2 in front of MgO, resulting in the balanced equation: [tex]2Mg + O2 -- 2MgO.[/tex]
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How do I calculate the molecular formula for a compound with an empirical formula CH2O and a molar mass of 90 g/mol?
Which statement is correct about honey?
It contains disaccharides, a complex type of lipid.
It contains monosaccharides, the simplest carbohydrate.
It contains starch, which gives it a sweet taste.
It contains lipids, which give it a sweet taste.
The correct statement about the honey is It contains monosaccharides, the simplest carbohydrate.
Hence, Option (2) is correct answer.
What is Carbohydrate ?Carbohydrate are the sugar molecules. It is the main nutrient in food and drinks.
Now lets check all statement one by one:
Option (1): It contains disaccharides, a complex type of lipid.
Disaccharides are the type of sugar which is formed when the two monosaccharides are joined by linkage that is Glycosidic linkage.
So it is incorrect statement.
Option (2): It contains monosaccharides, the simplest carbohydrate.
Honey is made up of simple sugars that is glucose and fructose is known as monosaccharides.
So it is correct statement.
Option (3): It contains starch, which gives it a sweet taste.
It contains glucose which gives honey a sweet taste.
So it is incorrect statement.
Option (4): It contains lipids, which give it a sweet taste.
Honey contains the simple sugars which give the honey sweet taste.
So it is incorrect statement.
Thus, from above conclusion we can say that The correct statement about the honey is It contains monosaccharides, the simplest carbohydrate.
Hence, Option (2) is correct answer.
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A mixture of methane and air is used in a lime kiln. Explain why?
Determine the number of neutrons in an atom of Rg-272.
Explanation:
Roentgenium is a radiactive element which is represented by symbol Rg. Atomic number of Rg is 111 and its atomic mass is 272.
It is known that atomic number is the number of protons present in an atom. Whereas atomic mass is the sum of total number of protons and neutrons present in an atom.
That is, Atomic mass = no. of protons + no. of neutrons
272 = 111 + no. of neutrons
no. of neutrons = 272 - 111
= 161
Thus, we can conclude that there are 161 neutrons present in Rg-272.
A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound?
A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound?
The empirical formula for the compound is KNO3.
What is the empirical formula?
We first came up with two significant sorts of chemical formulas: molecular formula and empirical formula, by calculating the masses of all the constituent atoms that combine to create a molecule.
While the molecular formula provides the precise quantity of each unique element present in a molecule, the empirical formula of a compound provides the simplest ratio of the number of various atoms present. It is an empirical formula if it has been simplified. The empirical formula is multiplied by the widely used molecular formula.
The overall correlation between the empirical formula and the molecular formula is
Molecular Formula = n × Empirical Formula
Thus,
K : 38.7 g / 39.1 g/mol = 0.99N : 13.9 g / 14.0 g/mol = 0.99O : 47.4 g / 16.0 g/mol = 2.96
Dividing by the smallest:
K : 0.99 / 0.99 = 1N : 0.99 / 0.99 = 1O : 2.96 / 0.99 = 3
Therefore the formula for the compound is KNO3.
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What is the oxidation number for ba??
Answer: +2
I finished the assignment.
which of the following elements is chemically most similar to chlorine? A) helium b) sodium c) bromine d) hydrogen
Answer:
bromine
Explanation:
Any element with 7 electrons in the outermost shell will have similar properties. Thus other elements in the same column of the periodic table as chlorine will have similar properties. Elements in this column form what is called the Halogen series, which is composed of fluorine, chlorine, bromine, iodine, and astatine.
The solid sink to the bottom when placed in a container of water. what does this tell you about it's density
It can be concluded that the density of solid is greater than 1 g/cm³.
We have a solid which sank to the bottom when placed in water.
We have to investigate about its density.
What is the density of water?The density of water is 1 g/cm³.
According to the question -
If a Solid body sinks in water, then it can be concluded that the density of this solid body is greater than that of water. Mathematically -
ρ(b) > 1 g/cm³
Hence, it can be concluded that the density of solid is greater than
1 g/cm³.
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Which of the answer choices best represents the approximate relative mass of the three subatomic particles?
(Select all that apply.)
protons = neutrons
electrons = neutrons
neutrons > electrons
protons > electrons
Answer:
The choices that best represent relative mass are
protons = neutrons
neutrons > electrons
protons > electrons
Explanation:
If we assume that the relative mass of proton is 1, then the relative mass of neutron is also equal to 1. The relative mass of electron is about 1/2000 the mass of proton so if the mass of proton is 1 then the relative mass of electron would be 0.00055. Therefore, the mass of electron and neutron cannot be the same and the electron relative mass will be less than that of neutron and proton.
What is the total pressure on the gas after the 760 mm Hg has been added?
FIRST PHASE atmospheric pressure= 760 torr gas volume= 60 mL (760 mm Hg added to 2nd phase) SECOND PHASE atmospheric pressure= 760 torr Gas volume= 30 mL **image looks like a J. in the 2nd phase, there is 760 mm that is half of the J** if that makes any sense.
I am confused on how you solve the problem considering the torr and ml and mm and mmHg
Answer:
1520 torr = 1520mmHg = 2 atm.
Explanation:
Please note that it is just basic conversion.
1 torr = 1mmHg
1 atm = 760mmHg = 760 torr
As per the question,
FIRST PHASE:
760 torr pressure is applied which gave = 60mL volume to gas.
SECOND PHASE:
760mmHg pressure is applied which gave = 30mL volume to gas
Since we know that 1mmHg = 1 torr.
Therefore, total gas pressure = 760 + 760 = 1520 torr OR 1520mmHg
How many moles of oxygen are necessary to completely react with propane (C3H8) to produce 16.3 mol of water according to the following balanced chemical equation? ________________________________________________________________________ C3H8 + 5 O2 -> 3 CO2 + 4 H2O
I tried doing these they are due by 12:00 please help i have 2 more like this
Answer:
20.375 moles of oxygen are necessary to completely react with propane to produce 16.3 moles of water.
Explanation:
[tex]C_3H_8 + 5O_2\rightarrow 3 CO_2 + 4H_2O[/tex]
Mole sof water formed = 16.3 moles
According to reaction , 4 moles of water are obtained from 5 moles of oxygen.
Then 16.3 moles of oxygen will be obtained from:
[tex]\frac{5}{4}\times 16.3 mol =20.375 mol[/tex] of oxygen
20.375 moles of oxygen are necessary to completely react with propane.
When a material in the liquid state is vaporized and then condensed to a liquid, the steps in the process are, respectively,?
When a material in the liquid state is vaporized and then condensed to a liquid, the steps in the process are [tex]\boxed{{\text{endothermic}}}[/tex] and [tex]\boxed{{\text{exothermic}}}[/tex] respectively.
Further Explanation:
Changes are of two types:
(A) Physical changes:
It is the process in which the physical properties of the system are affected. These changes can also be reversed by physical methods. In these kinds of changes, the molecular composition of the substance remains the same. These are reversible in nature and no new substances are formed. For example, boiling of water, chopping of wood, melting of wax are physical changes.
(B) Chemical changes:
In this change, new substances are formed by the chemical combination of the previous substances. The chemical properties of substance change when it undergoes a chemical change. These are irreversible in nature. For example, fermentation of grapes, burning of wood, rusting of iron are chemical changes.
Condensation: It is the process when vapors are converted to the liquid state.
Evaporation: It is the process in which liquid is converted into vapors.
Endothermic reactions are those in which more energy needs to be supplied to the system than that released by it.
Exothermic reactions are those in which more energy is released by the system than that supplied to it.
In the first step, the liquid is vaporized. The intermolecular forces in liquid state are to be broken down and energy is supplied for the purpose. Hence it is an endothermic process.
In the second step, the gas is condensed. The intermolecular forces in the gas are weaker than that in liquid state and energy is released during the conversion of gas to liquid. Hence it is an exothermic process.
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2. Which of the phase changes is an exothermic change? https://brainly.com/question/1875234
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Physical and chemical changes
Keywords: physical change, chemical change, liquid, gas, evaporation, condensation, endothermic, exothermic, intermolecular forces.
when a wave hits a surface through which it cannot pass and bounces back it undergoes?