Answer:
protons and neutrons
Explanation:
because Neil bohr had described this is his theory
Answer:
hope this help
Explanation:
In Bohr's model, electrons moved around the atomic nucleus in circular orbits, but those orbits had set discrete energies, and electrons could gain or lose energy only by moving from one orbit to another, absorbing or emitting radiation as necessary.
Consider the solvents that will be used as potential recrystallization solvents: water, hexane, and ethanol. which is the most polar? least polar? miscibloe?
Water is most polar solvent that is used for the process of re-crystallization and Ethanol is less polar than water . Ethanol is miscible with both water and hexane.
Water acts as a polar solvent because it can attracted to either the positive or negative electrical charge on the solute .Hence, water is most polar solvent. Ethanol is less polar to water but very polar molecule due hydroxy group, which forms hydrogen bond with other molecules.Hexane is a non polar compound.
The two liquids that mix completely together are called as miscible liquids.Ethanol is miscible with water and hexane both.water and ethanol both are the pair of miscible liquids because ethanol and water can mix together completely and we get a clear colorless liquid.ethanol can mixed in water in any proportion without any limit.
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Emeralds are composed of 4 different elements in a fixed proportion. they are composed of 5.030% beryllium, 10.040% aluminum, 31.351% silicon and 53.579% oxygen. the empirical and molecular formula are the same
The empirical formula of emerald is Be3Al2Si6O18.
The empirical formula of a compound tells us about the simplest ratio between the atoms present in the compound.
We are given that emerald consists of 5.030% beryllium, 10.040% aluminum, 31.351% silicon and 53.579% oxygen.
So, we need to first convert the percentages into number of moles of the elements.
Let us assume that there is 100 grams of emerald.
Hence, the mass of each element in it is 5.030 grams beryllium, 10.040 grams aluminum, 31.351 grams silicon and 53.579 grams oxygen.
To calculate the moles, we need to divide their given mass by their molar mass
Moles of beryllium(Be) = 5.030/9 = 0.55
Moles of aluminium(Al) = 10.040/27 = 0.37
Moles of silicon(Si) = 31.351/28 = 1.107
Moles of oxygen(O) = 53.579/16 = 3.34
Now, we need to divide the moles by the lowest common number among them i.e, 0.37.
So, 0.55/0.37 = 1.5
0.37/0.37 = 1
1.107/0.37 = 3
3.34/0.37 = 9
So, the ratio of Be:Al:Si:O comes out to be 1.5:1:3:9.
As the ratio contains 1.5, so we need to multiply it by 2 to get a whole number.
So, (1.5:1:3:9) x 2 = 3:2:6:18
Thus, the empirical formula of emerald is Be3Al2Si6O18.
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The empirical formula of emerald is [tex]Be_{3}Al_{2}Si_{6}O_{18}[/tex].
The empirical formula of a compound tells us about the simplest ratio between the atoms present in the compound.
We are given that emerald consists of 5.030% beryllium, 10.040% aluminum, 31.351% silicon and 53.579% oxygen.
So, we need to first convert the percentages into number of moles of the elements.
Let us assume that there is 100 grams of emerald.
Hence, the mass of each element in it is 5.030 grams beryllium, 10.040 grams aluminum, 31.351 grams silicon and 53.579 grams oxygen.
To calculate the moles, we need to divide their given mass by their molar mass
Moles of beryllium(Be) = [tex]\frac{5.030}{9} = 0.55[/tex]
Moles of aluminium(Al) = [tex]\frac{10.040}{27} = 0.37[/tex]
Moles of silicon(Si) = [tex]\frac{31.351}{28} = 1.107[/tex]
Moles of oxygen(O) = [tex]\frac{53,579}{16} = 3.34[/tex]
Now, we need to divide the moles by the lowest common number among them i.e., 0.37.
So, [tex]\frac{0.55}{0.37} = 1.5[/tex]
[tex]\frac{0.37}{0.37} = 1[/tex]
[tex]\frac{1.107}{0.37} = 3[/tex]
[tex]\frac{3.34}{0.37} = 9[/tex]
So, the ratio of Be:Al:Si:O comes out to be 1.5:1:3:9.
As the ratio contains 1.5, so we need to multiply it by 2 to get a whole number.
So, (1.5:1:3:9) x 2 = 3:2:6:18
Thus, the empirical formula of emerald is [tex]Be_{3}Al_{2}Si_{6}O_{18}[/tex]..
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please help
The amount of matter in an object is known as ____ and it is measured using an electronic balance. The SI unit used with this measurement is ___. The amount of space something takes up is ___ and a graduated cylinder is most commonly used for liquids. The basic SI unit used for graduated cylinders in the ___.
please put answers in order
Answer:
Mass.
Si Unit Measurement.
volume.
milliliters.
The measurement 0.035550 g rounded off to two significant figures would
be
Answer:
0.036g
Explanation:
I've learned about sig figs
The tendency of an atom to pull electrons toward itself is referred to as its _____. ionic potential tonicity covalency electronegativity polarity
Electronegativity
The tendency of an atom to pull electrons towards itself is called electronegativity.
It is the tendency of an atom to attract bonding pair of electrons towards itself. These atoms which are more electronegative are able to bear a negative charge and be stable.
Unlike electropositive elements which tend to lose electrons , electronegative elements hold on tightly to the electrons.
The electronegativity is measured using the Pauling Scale where the most electronegative element of the periodic table, Fluorine , is given a value of 4 and the rest of the elements have values lower than 4 according to the trends followed by their groups and periods.
The least electronegative element of the periodic table , Cesium has a value of 0.7 on the Pauling Scale.
Electronegativity increases when we move from left to right in the periodic table and it decreases (in general) when we move down the group.
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What is the frequency of a radio
wave with an energy of
8.3 x 10-24 J?
[? ] × 10¹²] Hz
The frequency of a radio wave with an energy of 8.3 x 10-24 J is 1.257 ×10¹⁰ Hz
For the calculation of energy, we know that
E = h[tex]v[/tex]
where. E is energy
h is planks constant
and [tex]v[/tex] is the frequency.
thus, E = 8.3× 10⁻²⁴ J
and h = 6.6 × 10⁻³⁴ Js.
Now, putting values in the formula we get,
8.3× 10 ⁻²⁴ = 6.6×10 ⁻³⁴ × [tex]v[/tex]
thus, [tex]v[/tex] = 8.3 × 10⁻²⁴ / 6.6 ×10⁻³⁴
[tex]v[/tex] = 1.257 ×10¹⁰ Hz
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A proton is moving at a speed of 0.30 mm s-1. if the uncertainty in its momentum is to be reduced to 0.0400 per cent, what will be the uncertainty in its position in nanometers?
Response: 26.3 nm
A proton is moving at a speed of 0.30 mm s-1.
if the uncertainty in its momentum is to be reduced to 0.0400 per cent
0.04% of 0.3 Mms-1 = delta v.
= 1.2*10^-4 Mm/s
= 1.2*10^-4*10^6 m/s
delta v= 120 m/s
delta x *m*delta v=h/4pi
delta x*(1.67*10^-27)*120 = 6.626*10^-34/ 4pi
delta x = 2.63 *10^-10
delta x = 26.3 nm
if the uncertainty in its momentum is to be reduced to 0.0400 per cent, 26.3 nm will be the uncertainty.
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which elements have one valence electron?
Answer:
GOLDEN TRICK
Explanation:
GO TO ND ASK.
MARK 5 STAR FOR THIS BRILLIANT ADVICE.
Which observation most likely indicates that only a chemical change has taken place?(1 point)The change cannot be reversed.
The shape changes
States of matter changes.
A reaction occurs.
Answer:
Correct answer is “a reaction occurs” because in the readings it says specifically chemical changes can be reversed but it’s not easy.
Explanation:
Convert 3.6 g/cm³ to lb/in³.
Answer:
0.130058
Explanation:
divide the mass / volume by 27.68
It is a good idea to put input values and output values into separate sheets when solving a complex problem if it improves readability and usability. True or false?.
It is a good idea to put input values and output values into separate sheets when solving a complex problem if it improves readability and usability. this statement is false.
The definition of a problem is something that needs to be resolved or an unpleasant or undesirable condition that needs to be corrected. An example problem is an algebraic equation. An example problem is when it's raining and you don't have an umbrella.
The most common meaning is a diplomatic alternative to "problem". The word "problem" can be too negative, especially in the world of politics and business. It focuses on the bad side of things and suggests that someone made a mistake. The main difference between a task and a problem is that a task is a difficult task that a person wishes to complete, whereas a problem is difficult to manage, understand, and impedes an individual's progress.
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How many moles of calcium ions, nitrate ions, and oxygen atoms are present in 0.502 mol of calcium nitrate? calcium ions mol nitrate ions mol oxygen atoms mol
Calcium ions=0.502 mol, nitrate ions= 1.004 mol,oxygen atoms =3.012 mol.
Calcium nitrate Ca(NO3)2 = 0.502 mol
the required equation for the given question is below:
Ca(NO3)2 —-> 2N03- + Ca2+
contains :2 nitrate ions per mole of Ca(NO3)2.,
1 calcium ion per mole of Ca(NO3)2.,
6 oxygen atoms per mole of Ca(NO3)2.
Calcium ions therefore equal 0.502 mol,
nitrate ions equal 2 x 0.502 mol
= 1.004 mol
oxygen atoms equal 6 x 0.502 mol
= 3.012 mol .
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How many moles of oxygen are consumed in the complete combustion of 1.60 moles of benzene, c6h6?
In the complete combustion of 1.60 moles of benzene, C6H6, 12 moles of oxygen, O2, is consumed.
Combustion is defined as the process of burning something. In chemistry, combustion refers to the chemical process between a fuel and an oxidant, usually oxygen to produce heat and light in the form of flame.
In a complete combustion, oxygen is sufficient to react with any hydrocarbons to produce carbon dioxide and water.
Balancing the combustion reaction of benzene, we have:
2C6H6 + 15 O2 = 12CO2 + 6H2O
Based on the balanced combustion reaction above, 2 moles of benzene requires 15 moles of oxygen to have a complete combustion.
If we have 1.60 moles C6H6,
moles O2 = mole ratio x mole of benzene
moles O2 = (15 moles O2/2 moles C6H6) x 1.60 moles C6H6
moles O2 = 12
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If you have purchased used machinery and it does not come with maintenance instructions, you should __________.
If you have purchased used machinery and it does not come with maintenance instructions, you should contact the manufacturer or check their website.
New machinery always come with maintenance instructions.
With an used machinery that is not always a case.
Machinery manufacturer is the best place to get help for some issues.
The manufacturer can provide necessary informations about maintenance instructions and other important informations about their products.
Another place to find necessary informations is website of the manufacturer of the used machinery. Website usually have many others usefull informations about the product. Many manufacturer optimize their information pages.
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A concentrated salt solution has a mass of 5.34 g for a 5.00 ml sample. what is the specific gravity of this solution?
The specific gravity of the solution is 1.07, which contains 5.34g for a 5.00ml sample.
Density of a substance is
Density = Mass / Volume
= 5.34/5
= 1.07
Density of water = 1
Specific gravity = Density of substance/density of solvent
Specific gravity = 1.07 / 1
Specific gravity = 1.07
Specific gravity, often known as relative density, is the ratio of a substance's density to that of an industry standard.
If a material has a relative density that is less than 1 compared to the reference, it is less dense than the reference; if it is larger than 1, it is denser. Identical volumes of the two substances have the same mass if the relative densities are equal, or exactly 1.
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______ suspends lipids in the watery chyme in the small intestine so that lipids can be more easily digested by lipase enzymes.
Bile suspends lipids in the watery chyme in the small intestine so that lipids can be more easily digested by lipase enzymes.
Enzymes are proteins that accelerate metabolism and chemical reactions in the body. Build some substances and break down others. All living things have enzymes. Our bodies naturally produce enzymes. However, enzymes are also found in finished products and foods.
According to the International Union of Biochemists (I U B), enzymes are divided into six functional classes, classified according to the types of reactions used to catalyze them. The six enzymes are hydrolases, oxidoreductases, lyases, transferases, ligases, and isomerases.
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A 0.372-g sample of naoh(s) is added enough water to make 250.0 ml of solution. the ph of this solution is:______
A 0.372-g sample of sodium hydroxide(s) is added enough water to make 250.0 ml of solution. the ph of this solution is 12.571
gram of sodium hydroxide X 1 mol of NaoH in volume/total vol of NaoH= 0.093ml/250ml=0.372= 12.571
Other names for sodium hydroxide include lye, soda, and caustic soda. Sodium hydroxide is a white, crystalline, odorless solid at room temperature that draws moisture from the atmosphere. It is a product of synthetic manufacturing. It produces significant amounts of heat when dissolved in water or neutralized with acid, which could be enough to ignite combustible objects. It is very corrosive to use sodium hydroxide. In most cases, sodium hydroxide is utilized as a solid or diluted to a 50% solution. The production of soaps, rayon, paper, explosives, dyestuffs, and petroleum products all employ this chemical.
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How many moles of naoh are present in 25.0 ml of a 0.1000 m naoh solution?
a. 100 mol
b. 2.50 x 10-3 mol
c. 0.100 mol
d. 2.50 mol
e. 25.0 mol
2.50 x 10⁻³ mol naoh are present in 25.0 ml of a 0.1000 m naoh solution
Here Molarity formula is used to find moles in solution
Molarity = no of moles of solute/volume of solution
M= molarity, V = volume , n= no of moles
M=0.1000m , V=25.0ml , n=?
M=n/v(ml)×1000
n=MV/10³ = 0.1000×25.0/10³ = 2.50 x 10⁻³ mol
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A student reported that their zinc layer was 18256793.61 atoms thick. what are three things wrong with reporting this number?
Three things wrong with reporting this number are fractional atom, scientific notation and unit of measurement .
1) Decimal fraction of 0.61 is wrong for number of atoms. For number of atoms, whole numbers must be used, not fractional. For example 1, 25 or 565
2) In example like this, large number should be displayed in scientific notation. It depands on the number of significant figures, but this number can be reported as 1.826x10⁸.
3) Number of atoms is not standard for measurement of thickness of the layer. It is better to us nm (nanometers) or some other unit for the lenght.
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Which planet will have a diameter
that is approximately ten times
larger than Mercury on a scale
model?
O Mars
O Neptune
O Jupiter
O Venus
The planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune (option B).
What is a scale model?A scale model is a three-dimensional copy or representation of something in which all parts have dimensions in the same proportion to that of the original.
In the solar system, there are nine planets. These nine planets in a decreasing order of their size (diameter) are as follows:
Jupiter - 142,800 KmSaturn - 120,660 KmUranus - 51,118 KmNeptune - 49,528 KmEarth - 12,756 KmVenus - 12,104 KmMars - 6,779 KmMercury - 4,849 KmBased on the original diameters of the planets, it can be said that the planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune.
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Answer:
neptune
Explanation:
Solve the simultaneous equation
-4x+3y=1
6x-y=2
Answer:
x = 1/2 y = 1
Step-by-step explanation:
Now form equation for y,
→ 6x - y = 2
→ y = 6x - 2
Then the value of x will be,
→ -4x + 3y = 1
→ -4x + 3(6x - 2) = 1
→ -4x + 18x - 6 = 1
→ 14x = 1 + 6
→ x = 7/14
→ [ x = 1/2 ]
Hence, the value of x is 1/2 (or) 0.5.
Now the value of y will be,
→ y = 6x - 2
→ y = 6(1/2) - 2
→ y = 3 - 2
→ [ y = 1 ]
Hence, the value of y is 1.
which of the following correctly describes an Arrhenius acid?
Answer:
D.
Explanation:
An Arrhenius acid is a compound that increases the H+ ion concentration in a water solution.
The haber process is typically carried out at a temperature of approximately 500 ∘c. What would happen to the rate of the forward reaction if the temperature were lowered to 100 ∘c ?.
The Haber process is typically carried out at a temperature of approximately [tex]500^{0}C[/tex]. The rate of the forward reaction would be decreased if the temperature were lowered to [tex]100^{0}C[/tex].
For every [tex]10^{0} C[/tex] increase in temperature, most reactions double in rate. On the other hand, a temperature that is too low cannot be used because the rate of the reaction will be significantly slowed. As a result, a compromise temperature [tex]450^{0}C[/tex] is used, which is high enough for the rate to be quite fast but low enough to yield a relatively high ammonia yield. This reaction takes place at a pressure of 200 atm.
Higher temperatures accelerate the rate of reaction. We've seen that when reactions are carried out at a higher temperature, the rate of reaction increases. A higher temperature would allow the Haber process to occur more quickly.
Temperature increases typically increase the rate of reaction. The average kinetic energy of the reactant molecules increases as the temperature rises. As a result, a larger proportion of molecules will have the minimum energy required for an effective collision.
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If titrating 10.00 ml of 0.1 m amino acid, how many ml of 0.1 m naoh is equal to 1 equivalent of base?
10 mL of 0.1 M NaOH is equal to 1 equivalent of base, if titrating 10.00 mL of 0.1 M amino acid.
Given :
0.1 M NaOH
0.1 M Amino acid
10.00 mL volume of Amino acid
R-CH(NH₂)-COOH + NaOH → R-CHNH₂Na + H₂O
In this case, end factor = 1 and It is 1 mole / 1 mole ratio
Since, the concentration of amino acid and NaOH are same, that is 0.1 M.
Concentration of amino acid = concentration of NaOH
0.1 M = 0.1 M
Therefore, 10 mL of NaOH is required to neutralize 10 mL of amino acid and the end factor is equivalent to 1.
Hence, The volume of 0.1 M NaOH is equal to 1 equivalent of base.
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Rutherford proposed the __________. nuclear theory the law of conservation of mass theory of evolution hydrogen bomb power plant
Rutherford proposed the atomic model nuclear theory the law of conservation of mass theory of evolution hydrogen bomb power plant.
The atomic nucleus is the tiny center of an atom that contains practically all its mass. Ernest Rutherford put forward the nuclear structure of the atom, discovered alpha and beta rays, and also projected the laws of radioactive decay. Complete step by step answer we must know that the nuclear theory of the atom was put forward by Rutherford. the law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.
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Landfills produce methane, which is a greenhouse gas and contributes to global warming. please select the best answer from the choices provided t f
It is true that methane, which is a greenhouse gas and contributes to global warming.
A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range.
Global warming is rise in the average temperature of the Earth's climate system.
Most often greenhouse gases are carbon dioxide (CO₂) and methane (molecular formula CH₄). These gases come from burning multiple substances: coal, petroleum, plastic and natural gas.
Balanced chemical reaction of combustion of methane:
CH₄ + 2O₂ → CO₂ + 2H₂O
Greenhouse gases are so difficult to measure, because carbone dioxide, methane, chlorofluorocarbons comes from multiple sources, some of which are relatively hard to measure.
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Answer:
It's true
Explanation:
Took the test
Linking amino acid monomers together to form a polymer requires the formation of which type of bond?.
Polypeptides : Peptides are tiny chains of amino acids connected by the peptide bonds.
Function of polypeptides : Polypeptides aid make up proteins by bonding many amino acids conjointly.
Amino acids are organic components that comprises both amino and carboxylic acid functional groups.
Sequence of amino acids are known as polypeptides. The covalent bonds that hold on to amino acids conjointly are known as peptide bonds.
Types of amino acids : nonpolar, polar, negatively charged, and positively charged.
According to question
Linking amino acid monomers together to form a polymer requires the formation of peptide bonds.
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When the renal tubules secrete hydrogen ions into the tubular fluid, they __________ at the same time.
When the renal tubules secrete hydrogen ions into the tubular fluid, they reabsorb sodium at the same time.
What are renal tubules?
The tiny or microscopic structural and functional component of the kidney called a nephron. A renal corpuscle and a renal tubule make up its structure. From the capsule protrudes the renal tubule.
One of the many microscopic tubes in the kidneys that replenishes the blood with nutrients, fluids, and other substances that have been removed from it but are still required by the organism. Urine is created in the renal tubules from any leftover fluid and trash.
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What chemical reactions occur in a Nelson's cell?
Explanation:
The graphite anodes are suspended into the brine. During electrolysis, Cl ions are oxidized at the anode and chlorine gas goes out of the cell, while sodium ions are reduced at the mercury cathode forming sodium amalgam. ... Hydrogen gas is obtained as a by–product at the cathode.
A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. What is the best approximation of the new ph value?.
If a chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions then the best approximate value of new pH is 5.
When only pure water is there.
H₂O ⇌ H⁺ + OH⁻
pKw = pH + pOH
14 = pH + pH ( This is because the value of pH and pOH is same in water and we need to consider pH here.)
14 = 2pH
pH= 14/2 = 7
So, pH of pure water is 7.
Concentration of hydrogen ions in pure water can be calculated using the equation
pH = -log[H⁺]
7 = -log[H⁺]
[H+] = 10⁻⁷ M
So, the concentration of hydrogen ions in pure water is 10⁻⁷ M.
Now, the chemist added a chemical to this pure water such that there is 100- fold increase in concentration of hydrogen ions.
So, the new concentration of hydrogen ions is calculated as shown below.
[H⁺] = 100 ×10⁻⁷ M
= 10⁻⁵ M
The new concentration of hydrogen ions is 10⁻⁵ M.
Now, the new pH can be calculated using the formula
pH = -log[H⁺]
= -log[10⁻⁵]
= -×-5log[10]
= 5×1
= 5
So, the new pH value = 5.
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