Answer:
2.068
Explanation:
D = M/V
3.04 /1.47
= 2.068
What discovery proved Mendeleev's periodic table to be correct and Newlands' to be
wrong?
The discovery of protons and isotopes
The discovery of oxygen and nitrogen
The discovery of electron shells
The discovery of atomic weight
0/1
Answer: The discovery of protons and isotopes
Explanation: Mendeleev's arrangement by changing the criteria by which elements were arranged and assigned atomic numbers. Mendeleev arranged the periodic table based on the atomic mass of an atom of an element and its chemical properties.
Sodium and lithium have similar chemical properties. What characteristics of these elements explain why they are chemically similar?.
Sodium and lithium have similar chemical properties because both sodium and lithium have one valence electron
Chemical properties is the characteristics of particular substances that can be observed in a chemical reaction and the valence shell electrons in an atom determine the way it will interact with neighboring atoms and therefore determine its chemical properties and both sodium and lithium have one valence electron they share similar chemical properties and element sodium and lithium belong to group IA of the periodic table and the main characteristics is the a single electron in their outermost shell
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boron has two naturally occurring isotopes: boron-10 (abundance 19.8%, mass 10.013 amu), boron-11 (abundance 80.2%, mass 11.009 amu). calculate the atomic mass of boron.
Answer:
Atomic mass of Boron: 10.8 amu
Explanation:
Boron-10: (0.198)(10.013) = 1.98 amu
Boron-11: (0.802)(11.009) = 8.83 amu
Add them up: 1.98+8.83= 10.8 amu
express Sb in a condensed form in order of increasing orbital energy
The condensed form of Sb in order of increasing orbital energy is [Kr] 5s² 4d¹⁰ 5p³
Sb (Antimony) is a metalloid with atomic number 51. The electronic configuration of antimony is 1s² 2s²p⁶ 3s²p⁶d¹⁰ 4s²p⁶d¹⁰5s²p³
As you can see, the normal notation of electronic configuration is lengthy. Condensed or abbreviated form of the configuration would be preferred to normal lengthy electronic configuration for representation.
In condensed form, in place of completely filled subshells with configuration that is similar to noble gas is represented by the symbol of that particular inert gas / noble gas. The symbol would be represented inside square brackets.
The electronic configuration of Krypton, a noble gas is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶.
Therefore, Sb can be expressed in condensed form as [Kr] 5s² 4d¹⁰ 5p³. As observed, 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ in Sb is expressed as Kr followed by the remaining electronic configuration in Sb in order of increasing orbital energy.
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how many possible monobromination products of butane are there? include minor product(s) not just the major product(s). if a product exists as a pair of enantiomers be sure to count both enantiomers as a distinct product.
Possible monobromination products of butane are 3.
What is a monobromination?Monobromination as defined by medicine:
an organic molecule is given one bromine atom by the addition process.
In a chemical process known as bromination, a compound is subjected to bromination, which adds bromine to the substance. Following bromination, the result will possess traits distinct from the initial reactant.
Any reaction or process known as bromination entails the introduction of bromine into a molecule alone. Alkene bromination with the electrophilic addition of Br₂. electrophilic aromatic substitution-based bromination of a benzene ring. Benzylic position bromination using a free radical substitution process.
By way of the reaction, a total of three monobrominated compounds will be produced.
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how many formula units are there in 212 grams of mgCl2
Formula units are there in 212 grams of MgCl₂ are 830.56
Formula is the empirical of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations and it is the lowest whole number ratio of ions represented in an ionic compound
Here given data is
MgCl₂ = 212 grams
1 mole of magnesium chloride has mass = 95.211 gram and contains 6.022×10²³formula units of magnesium chloride
Here 212 grams×6.022×10²³form unit of MgCl₂/95.211 gram = 830.56
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if 250 ml of a 0.0193 m cacl2 solution is prepared, how many moles of cacl2 would 25 ml of this solution contain? a. 0.0193 moles b. 0.00193 moles c. 4.83x10-3 moles d. 4.83x10-4 moles
25 ml of the solution contains 4.83 x 10⁻⁴ moles of CaCl₂.
Concentration, or the amount of solute in a solution, can either be expressed in molarity, M, moles of solute per liter of solution, or molality, m, moles of solute per kilogram of solution.
The concentration of the CaCl₂ solution is 0.0193 M.
Hence, there are 0.0193 moles of CaCl₂ per liter of the solution.
M = 0.0193 M
volume of solution = 25 ml
Multiply the volume by the concentration to get the number of moles.
M = moles of solute / volume of solution
moles of solute = M (volume of solution)
moles of solute = 0.0193 M(25 ml)(1 L / 1000 ml)
moles of solute = 4.83 x 10⁻⁴
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An unknown object has a mass of 125 grams. It is then added to a graduated cylinder filled with 55.0 mL of water. After being submerged, the water
level increases to 66.0 mL. What is the density of the object?
According to the given statement is 11.36 g/ml is the density of the object.
What is density of an object?The proportion of an object's mass to its volume has been its density. The unit of density is frequently grams per cubic centimeter (g/cm3). Keep in mind that the volume is measured in cubic centimeters, not grams (the same volume as 1 millilitre). More particles will make a box denser than fewer particles in the same box.
What many density are there?Absolute density and relative density are the two main types of density. Relative density, also known as specific gravity, is the proportion of a product's density to the density of a reference material.
Briefing:Mass = 125 g
Initial Volume =55.0 mL
Final Volume = 66.0 mL
Volume = 66.0mL - 55.0mL
Volume= 11.0 mL
ρ = m/v
ρ = 125/11
ρ = 11.36 g/ml.
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2. a. In general, how do the periodic properties of
the d-block elements compare with those of
the main-group elements?
b. Explain the comparison made in (a).
3. For each main-group element, what is the
relationship between its group number and
the number of valence electrons that the group
members have?
I will give Brainkist
The d block elements differ from the main group elements in the nature of the ions that they form. Also, the group number is related to the number of electrons in the valence sell of an atom.
What are the d block elements?The D block elements are those elements that are found to have d orbitals as the orbitals that has the highest energy in the atom. The d block elements are called the transition metals and they have an incompletely filled d - level.
Owing to the fact that d - level is incompletely filled they do exhibit variable oxidation states and are colored. On the other hand, the main group elements do not exhibit a variable oxidation states and the ions that they form are not colored.
Secondly, for each of the main group elements, the group number shows the number of valence electrons that are present in the outermost shell of the atoms in the elements of the groups.
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PLEASE SOMEONE HELP EXPLAIN THIS IT’S DUE FIRST THING TMRW MORNING!!
Determine the empirical formula of a 28.00 gram sample containing 22.90 grams carbon and 5.10 grams hydrogen.
If a 28.00 gram sample containing 22.90 grams carbon and 5.10 grams hydrogen , then the empirical formula is CH3 .
What is empirical formula ?The empirical formula, which is defined as the ratio of subscripts of the least whole number of the elements present in the formula, is the simplest formula for a compound. The simplest formula is another name for it.
The formula of a material expressed with the smallest integer subscript is referred to as an empirical formula for a compound.
The empirical formula provides details regarding the ratio of atom counts in the molecule. A compound's % composition directly determines its empirical formula.
Given ,
the mass of the sample of hydrogen and oxygen is 28g .
the mass of carbon in that sample is 22.9g
the mass of hydrogen in that sample is 5.1g
We know ,
the molecular mass of carbon is 12g
thus , 12g of carbon contains 1 mol
22.9g of carbon contains 22.9/12 = 1.9mol
the molecular mass of hydrogen is 1g
1g of hydrogen contains 1mol
5.1g of hydrogen contains 5.1mol
now , the mole ratio of carbon to hydrogen is
= C:H = 1.9/5.1 = 0.37 = 1:3
Hence , the empirical formula is CH3 .
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What is the mass of calcium oxide produced in the reaction?
Answer:
From the reaction stoichiometry, 2 moles of Ca produces 2 moles of CaO. Thus, the number of moles of Ca is the same as that of CaO. Therefore, n = 0.16892 mol for CaO. Hence, 9.47 grams of calcium oxide are produced.Help me please!
The pressure of 6.0 L of an ideal gas in a flexible container is decreased to one third of its original pressure and its absolute temperature is decreased by one half. What is the final volume of the gas?
The final volume of the ideal gas in a flexible container will be 9.0 L.
Let:
'P', 'V', and 'T' be the initial pressure, volume, and temperature of the ideal gas respectively'X' be the final volume of the ideal gasIdeal-gas Equation establishes a relation between pressures, volumes, and temperatures of different conditions.
Using the Ideal-Gas Equation:
PV = nRT
Ideal-Gas Equation for initial conditions will be:
PV = nRT.....................................................(i)
Ideal-Gas Equation for final conditions will be:
(P/3)X = nR(T/2)........................................(ii)
On dividing equations (i) and (ii):
PV = nRT / (P/3)X = nR(T/2)
3V/X = 2
X = 3V/2
Putting the value of V = 6L:
X = 3(6L)/2 = 9L
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N₂(g) + 3H₂(g) 2NH₂(g)
(iv) Name the catalyst used in this industrial process.
Answer:
I catalyst promoter is the answer
key questions 1. what distinguishes each of the four examples in illustrating the methodology? 2. why might it be necessary to put double or even triple bonds between atoms in constructing lewis structures? 3. how does the lewis structure help you identify the length of bonds in a molecule? 4. how is formal charge determined, and how is it used in identifying reasonable lewis structures? 5. in the above examples illustrating the methodology, why are relevant resonant structures - present only in the case of no2 ?
An atom's Lewis structure enables you to predict its bonding patterns and number of bonds. We may ultimately be able to comprehend the structures of molecules & their chemical characteristics using this information.
2. The stability of the molecule increases with the number of charges on each element. In order to reduce the number of different formal charges, a double or triple bond should be applied.
3. Dots are used in the Lewis structure to depict the shared electrons between atoms. Next, ascertain whether there is a single, triple, or triple covalent connection between the two atoms. Third, determine the radius of each of the bonded ions based on the type of bond by using an atom radius chart.
4. By considering each bond as if one-half of the electrons were allocated to each atom in a Lewis structure, formal charges can be ascribed to each atom. These fictitious formal charges serve as a reference for selecting the best Lewis structure.
5. N-O bond as well as a double bond. The N atom possesses a positive charge and an unpaired electron. They are the two principal resonance sources of NO2.
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I have four questions:
1- what can you say about the number of protons in these three metals as you look down in the group. (lithium, sodium, and potassium.)
2- what can you say about the mass number of the three metals.(lithium, sodium, and potassium.)
3- what is similar about the structures of an atom of lithium and an atom of sodium?
4- what is similar about the structures of lithium sodium and potassium?
The number of protons in lithium is 3, in sodium is 11 and in potassium is 19 whereas the mass number of lithium is 6.941 u, the mass number of sodium is 22.989769 u and the mass number of potassium is 39.0983 u.
What is the mass number of lithium, sodium, and potassium?Numbers of Protons:
The total number of protons in lithium is 3.
The total number of protons in sodium is 11.
The total number of protons in potassium is 19.
Mass Number:
The mass number of lithium is 6.941 u.
The mass number of sodium is 22.989769 u.
The mass number of potassium is 39.0983 u.
Structure of Lithium and Potassium:
Lithium and potassium have a similarity in them that they all have one electron in their outermost orbit.
Structure of Sodium and Potassium:
Sodium and potassium have a similarity in them that they all have one electron in their outermost orbit.
So we can conclude that the number of protons in lithium is 3, in sodium is 11 and in potassium is 19.
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Decomposers in the rainforest ___________ break down materials.
A:A. slowly
B:B. do not
C:C. quickly
D:D. rarely
Answer:
Quickly
Explanation:
Density of 85mL of water
Since water served as the foundation for creating the metric system of measurement, density is defined as mass divided by volume (=m/v), meaning that one cubic centimeter (1cm3) of water weighs one gram (1g).
The density of pure water is what.The density of water is typically expressed in terms of grams per milliliter (1 g/ml) or grams per cubic centimeter (1 g/cm3).
85-milliliter outcome
2.988 Ounces
0.1868 Pounds
84.719 Grames
0.0847 Kilograms
Weight at 80°F(26.7°c)
As the temperature drops, the water becomes denser. Water density reaches its maximum at 4 degrees Celsius.
Like a solid, a liquid's density is determined by dividing its mass by its volume, or D = m/v. Water has an average density of one gram per cubic centimeter. No matter the size of the sample, a substance has a constant density.
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The half life for the decay of radium is 1620 years. What is the rate constant for this first-order process?.
The rate constant of the Decay of Radium with half life of 1620 years is 0.0004277/year.
We know, every radioactive reaction is a first order reaction.
So, it will follow the first order kinetics.
The half life of the radium sample is 1620 years.
We know, the standard formula for the half life of the first order reaction is,
T = 0.693/K
Where,
T is the half life of the reaction,
L is the rate constant of the reaction.
It is given that the half life of the reaction is 1620 years, so, putting all the values,
T = 0.693/K
K = 0.693/1620
K = 0.0004277/year.
So, the rate constant of the decay of radium is 0.0004277/year.
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Convert 11.75 millimeters to meters.
Answer: 0.01175
Explanation:
what is the ph of a strontium hydroxide solution obtained by dissolving 0.17 grams of strontium hydroxide in enough water to obtain 670. ml of solution? insert your answer in decimal notation, rounded to 2 decimal digits.
The pH of a strontium hydroxide was obtained by dissolving 0.17 grams of strontium hydroxide in enough water to obtain 670. ml of solution is 3.6.
What is pH?The range of pH goes from 0 to 14, with 7 acting as neutral. A pH value of 7 or less denotes acidity, while a pH value of 7 or more denotes baseness. The amount of free hydrogen and hydroxyl ions present in the solution is what determines the pH of water.
Molarity of strontium hydroxide = mass/volume
Molarity of strontium hydroxide = 0.17/670
Molarity of strontium hydroxide = 0.000253 = 2.53 × 10⁻⁴
pH = - log [strontium hydroxide]
pH = -log [2.53 × 10⁻⁴]
pH = 3.59
pH = 3.6
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calculate the vapor pressure of a solution of 0.300 mol fraction of toluene and 0.700 mol fraction of cyclohexane at 32oc and determine whether the solution will boil. the vapor pressure of pure toluene is 40.2 torr and that of cyclohexane is 125 torr at 32oc
The Vapour pressure of the solution is 99.56 torr
The saturated vapour pressure of the solution maybe lower then the pressure of pure solvent in solution. It is equal to the vapour pressure of the pure solvent at the same temperature scaled by mole fraction of solvent stated by Rault's Law.
P(solution) = mol fraction of solvent × P° ( solvent)
given, pressure of pure toulene = 40.2 torr
pressure of pure cyclohexane = 125 torr
∴ P (solution) = 0.3 × 40.2 + 0.7 × 125
P (solution) = 99.56 torr
hence, vapour pressure is calculated to be 99.56 torr.
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help me out please and thank you
The metals that are able to displace iron sulfate from solution are magnesium and aluminum.
What is the electrochemical series?The electrochemical series is a series that shows the reactivity of the metals. We must note that the order of the reactivity of the metals depends on the electrode potential of the metal. The metals that have a higher electrode potential would tend to react better and faster.
Also note that, the metals that are higher in the electrochemical series are able to displace the metals that are lower in the series from their aqueous solutions. This implies that if we add a metal to a solution that contains a meta that is lower in the electrochemical series, the lower meta is discharged from solution.
As we can see, when we add each of these metals to the iron sulfate solution, the only time that we would be able to have a reaction is when we add the aluminum or the magnesium metals.
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Explain the difference between the first and second ionization energy of an element.
The difference between the first and second ionization energy of an element is second ionization energy is larger than first ionization energy.
Ionization energy is the energy required to remove the electron . First ionization energy is the amount of energy required to remove the electron from neutral atom such as M. while second ionization energy is the amount of energy required to remove electron from positively charged ion such as M⁺.
first ionization energy is given as :
M ---> M⁺ + e⁻ , IE1
second ionization energy is given as :
M⁺ ----> M²⁺ + e⁻ , IE2
Thus, The difference between the first and second ionization energy of an element is second ionization energy is larger than first ionization energy.
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coal-based power plants have a carbon dioxide emission of around 1,000 gco2eq/kwh. large scale hydropower plants have a carbon dioxide emission of around 30 gco2eq/kwh. rutgers university average power requirements is 20mw. what is the monthly (30 days) carbon dioxide emission reduction if the source of electricity is hydropower plant instead of coal-based generation?
In Niger State, Nigeria, there is a deposit of clay similar to kaolin that has a lot of promise for use in pollution control processes including wastewater treatment.
This study looks into the ideal settings for Kpautagi clay modification for use in treating the effluent from refineries. The clay was modified using sulphuric acid, and the modification factors taken into account were acid concentration, activation time, and temperature.
The sulphuric acid-modified Kpautagi clay was used in the treatment of refinery wastewater in column mode at a fixed flow rate and mass of adsorbent to establish the best conditions for the modification variables.
The results show that 4M acid concentration, 120min of activation time, and 100°C activation temperature are the best conditions for modifying Kpautagi clay for use in the treatment of petroleum refinery wastewater.
As a result, the best conditions discovered in this work for Kpautagi clay modification could be used to treat wastewater from petroleum refineries more effectively.
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a certain hydrocarbon is found to have the percent composition (by mass) of 92.3% c. the molecular formula contains 6 carbon atoms. how many hydrogen atoms are contained in a molecular of this compound?
The number of atoms of hydrogen contained in the molecular formula of the compound is 6 atoms
How to determine the number of atomsWe'll begin by obtaining the formula of the compound. This can be obtained as follow:
C = 92.3%H = 100 - 92.3 = 7.7%Empirical formula =?Divide by their molar mass
C = 92.3 / 12 = 7.7
H = 7.7 / 1 = 7.7
Divide by the smallest
C = 7.7 / 7.7 = 1
H = 7.7 / 7.7 = 1
Thus, the empirical formula of the compound is CH
Finally, we shall determin the number of atoms of hydrogen present in the compound. This can obtained as follow:
When 1 atom of carbon was present, 1 atom of hydrogen was also present.
Therefore,
When 6 atoms of carbon is present, then 6 atoms of hydrogen are also present.
Thus, we can conclude that the number of atoms of hydrogen is 6 atoms
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Measuring Liquid Volume Pre-Lab worksheet
1. The longer distance for each choice is:
1 mile1 meter1 inch2. The complete statements are as follows;
1 mi = 1.6 km1 yd = 0.9444 m1 in = 2.54 cm3. The basic unit of length in the metric system is the meter and is represented by a lowercase m.
4. The meter is defined as the distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second.
5. The values that complete each statement is given below:
1 km = 1000 m1 m = 100 cm1 m = 1000 mm6. The larger value for each option is:
A. 105 centimetersB. 4400 metersC. 12 centimetersD. 1200 millimeters7. The number of millimeters in 1 centimeter is 10 mm
8. Using the ruler and line, the answers are:
2.8 cm29 mm3 cmWhat is the unit for measuring distance in the metric system?The unit for measuring distance in the metric system is the meter. Smaller and larger values of the meter are also used such as millimeters, centimeters, kilometers, etc.
Other units for measuring distance include yards, miles, and inches.
The various units for measuring distance can also be interconverted using their conversion factors.
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which of the following is true about all spontaneous processes? a) it releases energy as heat. b) it will occur quickly. c) it will continue on its own once begun. d) it is never endothermic.
C) It will continue on its own once begun is true for spontaneous processes.
What is spontaneous process?A spontaneous process is one that takes place without the system receiving any outside input. The system which releases free energy and transitions to a lower, more thermodynamically stable energy state is a more technical definition.The sign convention for changes in free energy is as follows: a release of free energy from the system corresponds to a negative change in the system's free energy and a positive change in the surrounding free energy.Spontaneous processes do not require an external energy source because they are known to be characterized by a decrease in the system's free energy.Spontaneous processes are characterized by a rise in entropy in isolated systems when no energy is exchanged with the environment.Chemical reactions that occur spontaneously in the context of interest are referred to as spontaneous reactions.To learn more about spontaneous process, refer to https://brainly.com/question/14015869
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When sodium reacts with water.........gas evolves
(O2-CO2-H2-N2)
When sodium reacts with water, hydrogen gas evolves (option C).
What is a chemical reaction?A chemical reaction is a reaction that typically involves the breaking or making of interatomic bonds, in which one or more substances are changed into others.
A chemical reaction combines two or more substances called reactants to form new substances called products.
According to this question, sodium (Na) reacts with water (H2O) as follows:
2Na + 2H₂O → 2NaOH + H₂
As observed in the above chemical reaction, sodium metal reacts with water to produce sodium hydroxide and hydrogen gas.
Therefore, it can be said that hydrogen gas is evolved when sodium combines chemically with water.
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Please help How many moles of a gas sample are in 5.0 L container at 215 K and 342 kPa(The gas constant is 8.31 L kPa/mol K) Round your answer to one decimal place and enter the number only with no units.
Answer
1.0 mol
Explanation
Given:
Volume, V = 5.0 L
Temperature, T = 215 K
Pressure, P = 342 kPa
The gas constant, R = 8.31 L kPa/mol K
What to find:
The number of moles of the gas sample.
Step-step-solution:
The number of moles of the gas can be determine using the ideal gas equation formula:
[tex]PV=nRT[/tex]Put the given values into the formula and calculate for n:
[tex]\begin{gathered} 342\times5.0=n\times8.31\times215 \\ 1710=1786.65n \\ \text{Divide both sides by 1786.65} \\ \frac{1710}{1786.65}=\frac{1786.65n}{1786.65} \\ n=0.9571\text{ mol} \\ To\text{ one decimal place,} \\ n=1.0\text{ mol} \end{gathered}[/tex]The number of moles of the gas sample is 1.0 mol.
What best describes a solution after it has cooled
Answer: A supersaturated