Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, Wavelength decreases as frequency increases.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
c/λ = ν= frequency of electromagnetic wave
From above formula we can see frequency is inversely proportional to wavelength.
Therefore, Wavelength decreases as frequency increases.
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20 POINTS
Determine the mass of hydrogen gas collected in a container if the gas occupies
44.8 L at STP. [ans: 4.04 g]
Answer:4.03
Explanation:
C3H8 + O2 = CO2 + H2O
In the unbalanced chemical reaction for the combustion of propane, if 5.3 moles of carbon dioxide is produced, how many moles of oxygen reacted?
Answer:
if 5.3 moles of carbon dioxide is produced in the combustion of propane, 1.77 moles of oxygen would have reacted in the reaction.
Explanation:
To determine the number of moles of oxygen that reacted in the combustion of propane, you can use the balanced chemical equation for the reaction:
C3H8 + 5 O2 -> 3 CO2 + 4 H2O
In this equation, one mole of propane reacts with five moles of oxygen to produce three moles of carbon dioxide and four moles of water. If you know the number of moles of carbon dioxide produced in the reaction, you can use the balanced equation to determine the number of moles of oxygen that reacted.
For example, if 5.3 moles of carbon dioxide is produced in the reaction, you can use the balanced equation to determine the number of moles of oxygen that reacted:
5.3 moles CO2 / 3 moles CO2/mole O2 = 1.77 moles O2
9.48 Use bond energies to calculate the enthalpy of reaction:
ΔH(reaction) = sum of the bond energies of bonds being broken - sum of the bond energies of the bonds being formed.
What does "bond energy" mean?
The amount of energy required to separate the atoms forming a molecular bond into free atoms is known as bond energy, and it serves as a gauge of the strength of a chemical connectionWhat does a high bond energy mean?
The amount of power needed to rupture a covalent link between two atoms is known as bond energy. If a bond has a high bond energy, it is likely to be strong, and the molecule it is in will likely be stable and less reactive. Bonds in more reactive substances will often have lower bond energies.To know more about bond energy checkout this link:
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Can I have little help please
Answer:
what do you need help with
Farmers depend on a growing season to provide for their families. A growing season is the part of the year when rainfall and amount of sunlight allow plants to growth at a rapid rate. For many plants, especially crops that humans consume, the growing season occurs in the spring after the last frost and can last through the summer. You are to provide support for proving that additional sunlight during the growing season provides an increase in growth for plants.
First, your teacher asks you to demonstrate the relationship between sunlight entering the plant cell and increased growth. How do two organelles in the plant cell work together so the plant can grow? Use the following flowchart to show this relationship. Drag the correct terms from the bank to fill in the blanks.
What traits were you trying to control in the cattle is the most reasonable question.
What is agriculturist?a person who cultivates the and the land and grows to the crops on it agriculturists who adhere to their magnetic organization's standards of organic product is a good farming.
An agriculturist, agriculturalist, agrologist, or the agronomist, is a professional in the science, se can say them farmers alsopractice, and the management of agriculture and technology and agribusiness. It is a type of regulated profession in the Canada, India, the Philippines, the United and States, and the European Union.
Robert Bakewell is an it's agriculturist that revolutionized sheep and to the cattle breeding in England. He inherited his radiation father's farm and the he innovated brreding of the techniques. He separated his male and to the female livestocks to prevent random breeding. He further advanced a method method that tells desirable traits were exaggerated by inbreeding by the and undesirable traits were removed from the the breeding population.
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Describe how a muscle contracts. Include: thick filament/ thin filament/ M-line/ Z-line/ A band/ I band and lengthening/shortening
The contraction of the muscle is brought about by an Action Potential that moves from the nerve to the muscle. After the neurological system sends a signal, muscles start to contract.
What is a muscle fiber?An individual muscle cell makes up each muscle fiber. They facilitate the regulation of the bodily's physical forces. They can help your limbs and tissues operate in a coordinated manner when gathered together. There are various varieties of muscle fiber, each having unique properties. the meanings of muscle fiber. a lengthy, contractile cell that gives rise to body muscles. Muscle fiber and cell are similar terms. kinds include striated muscle fiber and striated muscle cell. in striated muscular tissue, an extended contractile cell. Myofibrils, which are sarcomeres connected in series, make up muscle fibers. Actin and myosin filament organization results in the banding pattern of myofibrils, which in turn produces the striations of skeletal muscle. a myofibril-rich, cylindric cell that, upon stimulation, contracts. Contraction.To learn more about muscle fiber refer to:
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Which of the following exhibits sp3 hybridization? Select the correct answer below: A. BH3 B. CH2O C. Ccl4
D. all of the above
The electron pairs in (C.)Ccl4 are arranged in a tetrahedral pattern around the carbon, necessitating sp3 hybridization. The four bonds between carbon and chlorine are formed by four sp3 hybrid orbitals.
Describe SP3 hybridization using an example.One's' orbital and three 'p' orbitals of equal energy are mixed in this process to create a new hybrid orbital known as sp3. Tetrahedral symmetry and a combination of s and p orbitals are preserved at 109.280. Ethane is an example of sp3 hybridization (C2H6).
What was the purpose of hybridization?The hybridization theory was created by chemist Linus Pauling in 1931 to use atomic orbitals to describe the structure of basic molecules like methane (CH4).
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Which of the following is true for Be?
Metal and Low electronegativity value
Metal and non-conductor
Metal, low electronegativity, has 2 valence electrons
Metal, high electronegativity, and has 2 valence electrons
Be is a metal with a low level of electronegativity.
Option a is correct.
A metal or a nonmetal has low electronegativity.High electronegativity elements are typically electrical insulators and nonmetals, and they frequently act as oxidants in chemical processes. On the other hand, elements with low electronegativity are typically metals, excellent electrical conductors, and have a propensity to act as reluctant in chemical reactions.
What metal possesses the lowest electronegativity?Francium, which has an electronegativity of 0.7, is the lowest value of any element. The electronegativity is calculated using the Pauling scale.
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use this equation and le chatelier's principle to explain how the addition of 6 m hno3 results in the dissolution of ni(oh)2(s).
Le chatelier's principle addition reactions
The addition of HNO3 moves the equilibrium to the right
so more amount of Ni(OH)2 S will be dissolved
The reaction will be;
Ni(OH)2 + HNO3 ⇔ Ni(NO3)2 + H2O
What is Le chatelier's Principle?A chemistry principle known as Chatelier's principle (or the Equilibrium Law) is used to forecast how a change in circumstances would affect chemical equilibria. The theory is named after the separate discovery by Karl Ferdinand Braun and occasionally French scientist Henry Louis Le Chatelier. It is possible to state:
A simple system in thermodynamic equilibrium shifts to a new equilibrium when a concentration, temperature, volume, or pressure change is applied. This new equilibrium partially cancels out the previous change.
Systems of simultaneous equilibrium can also exhibit phenomena that appear to defy Le Chatelier's principle.
so from this principle;
The addition of HNO3 moves the equilibrium to the right
so more amount of Ni(OH)2 S will be dissolved
The reaction will be;
Ni(OH)2 + HNO3 ⇔ Ni(NO3)2 + H2O
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6 CO2 + 6 H2O + light equation C6H12O6 + 6 O2
If there were 2.38 x 102 g of H2O, 18.6 moles of CO2, and plenty of light, what would be the theoretical yield of the reaction?
6 moles of carbon dioxide produces 1 mole of glucose in this reaction. Thus, 18.6 moles produces 3.1 moles or 558 g of glucose.
What is photosynthesis?Photosynthesis is the biological reaction of water with carbon dioxide in presence of light to give glucose an oxygen gas. Photosynthetic reaction takes place in green plants to synthesis energy.
As per the balanced equation of the reaction, 6 moles of water combines with 6 moles of carbon dioxide to produce 1 mole of glucose. Here water is taken in excess and carbon dioxide is 18.6 moles.
The number of moles of glucose produced from 18.6 moles of carbon dioxide = (18.6 ×1)/3 = 3.1 moles.
Molar mass of glucose = 180 g/mol.
3 moles of glucose = 180 × 3.1 = 558 g.
Therefore, the theoretical yield of the photosynthetic reaction with 18.6 moles of carbon dioxide is 558 g of glucose.
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Which of the species below can form a hydrogen bond?
where??? coz there is nothing below
write the symbol or formula (including charges) for each ion.a) ammonium ionb) chromate ionc) tin (II) iond) nitrate ion
The symbol or formula:
a) ammonium ion = [NH₄] ⁺
B) chromate ion = [CrO₄] ⁻²
c) tin (II) =Sn ⁺²
d) nitrate ion = [ NO₃] ⁻¹
How to represent the ions?
Ions are atoms or molecules that have a net electric charge due to the loss or gain of electrons. They can be represented by either a dot notation or a Lewis structure. In the dot notation, the number of valence electrons around the atom is indicated with dots located around the symbol representing the element. If the atom has a negative charge, a superscript minus sign is placed next to the element symbol. If the atom has a positive charge, a superscript plus sign is placed next to the symbol. In the Lewis structure, a line is used to represent an electron pair and a pair of dots is used to represent a single electron. The element symbol is placed in the center and the surrounding electrons are drawn in the shape of a circle around it.
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The balanced equation for the neutralization reaction of aqueous H₂SO₄ with aqueous KOH is shown.
H₂ SO₄ (aq) +2 KOH(aq) →2H₂ O(l)+K₂ SO₄ (aq)
What volume of 0.240 M KOH is needed to react completely with 11.4 mL of 0.110 M H₂ SO₄ ?
The volume of 0.240 M KOH that is needed to react completely with 11.4 mL of 0.110 M H₂SO₄ is 10.45mL.
How to calculate volume?The volume required by a solution to react with a substance can be calculated using the following formula:
CaVa/CbVb = Na/Nb
Where;
Cb = molarity of baseCa = molarity of acidVa = volume of acidVb = volume of baseNa = number of moles of acidNb = number of moles of baseAccording to this question, a neutralization reaction occurs between aqueous H₂SO₄ and aqueous KOH as follows:
H₂SO₄(aq) +2KOH(aq) → 2H₂O(l) + K₂SO₄(aq)
If 0.240M KOH is needed to react completely with 11.4mL of 0.110M H₂SO₄, the volume of KOH needed can be calculated as follows:
11.4 × 0.110/0.240 × Vb = 1/2
1.254/0.240Vb = 1/2
1.254 × 2 = 0.240Vb
Vb = 2.508 ÷ 0.240
Vb = 10.45mL
Therefore, 10.45mL is the volume of the base needed to neutralise the acid.
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Which of the following statements best describes the type of bond formed
between sodium and chlorine in sodium chloride?
0-a
Na
P:11
N:12
00
Na
66
00
Cl
P:17
N:18
00
00
Sodium Chloride
Sodium and chlorine form a ionic bond because they are sharing their valence
electrons.
Sodium and chlorine form an lonic bond because chlorine transfers its seven
valence electrons to sodium.
4
Sodium and chlorine form an ionic bond because chlorine takes sodium's only
valence electron
Positively charged sodium ions (Na+) and negative ion ions (Cl ) combine to generate sodium chloride (NaCl). Chemical bond is the form of bonding that exists between these ions.
What is the purpose of sodium chloride?As an electrolyte particularly, sodium chloride is used to assist reduce heat cramps brought on by excessive perspiration. The production of a typical isotonic solution of sodium chloride also uses this medication. There is no need for a license to get this medication.
Why is sodium chloride given to patients?To replace salt and water that have lost from your body as a result of certain conditions, sodium chloride 23.4% injection is employed (eg, hyponatremia or low salt syndrome). Furthermore, it is added to IV fluids that contain carbohydrates and parenteral nutrition total (TPN).
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An 12.68 gram ice cube at 0 degrees Celcius is placed in 316.81 grams of liquid water that is initially at 62.39 degrees Celcius. What is the final temperature of the water after the ice melts?
The final temperature of the water after the ice melts, given that the water has an initial temperature of 62.39°C, is 63.06 °C
How do I determine the final temperature?We can obtain the final temperature of the water after the ice melts as follow:
Mass of ice (M) = 12.68 gLatent heat (L) = 334 J/gInitital temperature of ice (Tᵢ) = 0 °CMass of water (Mᵥᵥ) = 316.81 gSpecific heat capacity of water (C) = 4.184 J/g°CTemperature of water (Tᵥᵥ) = 62.39 °CFinal temperature (T) =?Heat of cold = -heat of warm
ML + MC(T – Tᵢ) = -MᵥᵥC(T – Tᵥᵥ)
(12.68 × 334) + [12.68 × 4.184 (T - 0)] = -316.81 × 4.184 (T - 62.39)
4235.12 + 53.05312T = -1325.53304T + 82700.0063656
Collect like terms
53.05312T + 1325.53304T = 82700.0063656 + 4235.12
1378.58616T = 86935.1263656
Divide both sides by 1378.58616
T = 86935.1263656 / 1378.58616
T = 63.06 °C
Thus, from the above calculation, we can conclude that the final temperature is 63.06 °C
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The table below shows the dimensions of two colored cubes.
Dimensions of Cubes
Cube Side (cm) Mass
(g)
Blue 5 250
White 4 320
Which cube is denser?
Blue, because the ratio of its mass and side is higher.
White, because the ratio of its mass and side is lower.
Blue, because it has more volume and less amount of matter.
White, because it has less volume, but a lot more matter.
The white is denser because it has less volume, but a lot more matter. Option 4.
What is denisty?The density of a substance is the ratio of its mass and its volume. This can be mathematically expressed as:
Density = mass/volume.
For the cube with 5 cm sides and 250 g mass, the density can be derived by first calculating the volume as follows:
Volume = 5 x 5 x 5
= 125 [tex]cm^3[/tex]
Its density can be calculated as:
Density = 250/125
= 2 g/[tex]cm^3[/tex]
For the cube with a mass of 320 g and 4 cm sides, the volume and density can be calculated as follows:
volume = 4 x 4 x 4
= 64 [tex]cm^3[/tex]
Its density can then be calculated as:
Density = 320/64
= 5 g/[tex]cm^3[/tex]
Thus, the white cube is denser because it has a higher density by having less volume but more matter (mass).
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ANSWERED. !!!!!!!!!!!!!!!!
Answer:
:)
Explanation:
When heated, calcium carbonate, CaCO_3(s), decomposes to calcium oxide, CaCO(s), and carbon dioxide, CO_2. Using relevant data from your book's appendices, calculate the heat evolved or consumed when 15.0 g of calcium carbonate are decomposed.
Heat produced during the decomposition of 15 g of calcium carbonate is calculated to be 26.67 KJ.
What do you understand by reaction enthalpy?The heat evolved or absorbed during a reaction is known as reaction enthalpy and it is negative for exothermic reaction and positive for endothermic reaction.
As we know that heat produced when one mole of calcium carbonate decomposes is 177.8 KJ. Therefore, 15 g or 0.15 moles of calcium carbonate when decomposed will give 26.67 KJ of heat.
As we know, molar mass of calcium carbonate is 100 g.
So, no. of moles in 15 g becomes 15 /100
= 0.15 moles.
So, 100 g of calcium carbonate decompose to produce 177.8 KJ
Heat evolved after decomposition of 0.15 moles is
=0.15 × 177.8 KJ = 26.67 KJ.
Therefore, heat evolved in the decomposition of 15 g of calcium carbonate is found to be 26.67 KJ.
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Please select the most appropriate answer for the blank: Entropy change is defined only along the path of a(n) _____ process path. A. Reversible B. Irreversible
C. Externally reversible D. Internally reversible
Internal reversibility, Therefore, during reversible operations, the universe's entropy changes nothing. We can see that for a reversible, adiabatic operation, the change in a system's entropy is zero.
Is entropy a variable in PATH?dS=dQT=0 holds because any reversible process may be characterized as the sum of numerous infinitesimally small Carnot cycles. As a result, the entropy S is a state variable and the integral is independent of the path it takes. In strictly speaking, such route independence is only true for reversible processes.
Does entropy result from reversible processes?This procedure could proceed way without breaking the second law. Reversible processes are those of the latter type. A reversible process' main characteristic internal reversibility, Therefore, during reversible operations, the universe's entropy changes nothing. We can see that for a reversible, adiabatic operation, the change in a system's entropy is zero.
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classify each reaction as spontaneous or nonspontaneous. drag the appropriate items to their respective bins. view available hint(s)
A reaction is said to as "spontaneous" if it happens in conditions that encourage the production of products.When the standard change in free energy is positive and energy is absorbed, a chemical reaction is referred to be an endergonic reaction (also known as a nonspontaneous reaction).
The two categories of chemical reactions that can take place in the environment are spontaneous and nonspontaneous reactions. When a certain set of circumstances are present, spontaneous reactions happen on their own. For the non-spontaneous processes to continue, energy must be given.Accordingly, exergonic describes spontaneous responses whereas endergonic describes non-spontaneous reactions. The primary distinction between spontaneous and nonspontaneous reactions is the release of free energy from the system, which increases stability, as opposed to nonspontaneous reactions, which increase the system's overall energy.
complete question:Classify each solid as a covalent; ionic, metallic, or molecular solid. Drag the appropriate items to their respective bins: View Available Hint(s) Reset Help pure calcium, red phosphorus ,sugar ,calcium fluoride-Covalent, lonic, Metallic, Molecular.
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(Atomic masses used are C = 12.0 g mol–1, O = 16.0 g mol–1, H = 1.01 g mol–1, Cu = 63.5 g mol–1,)
1. How many moles are there in 5.0 g of methanol (CH3OH)?
How many molecules of CuCO3 would weigh 9.0 g?
How many moles would 3.0 g of cyclohexane (C6H12) contain?
How much would 4.00 moles of benzene weigh?
What is the mass of 1000 atoms of calcium?
Question 1
The formula mass of methanol is [tex]12.0+3(1.01)+16.0+1.01=32.04[/tex] g/mol.
Therefore, in 5.0 grams of methanol, there are [tex]5.0/32.04=\boxed{0.16}[/tex] moles.
Question 2
The formula mass of copper(II) carbonate is [tex]63.5+12.0+3(16.0)=123.5[/tex] g/mol.
This means that in 9.0 grams of copper(II) carbonate, there are [tex]9.0/123.5=0.072874493927126[/tex] moles.
Using Avogradro's number, there are [tex](0.072874493927126)(6.022 \times 10^{23})=\boxed{4.4 \times 10^{22}}[/tex] molecules.
Question 3
The formula mass of cyclohexane is [tex]12.0(6)+1.01(12)=84.12[/tex] g/mol.
So, 3.0 grams of cyclohexane is the same as [tex]3.0/84.12=\boxed{0.036}[/tex] moles.
Question 4
The formula mass of benzene is [tex]12.0(6)+1.01(6)=78.06[/tex] g/mol.
This means that 4.00 moles of benzene has a mass of [tex](78.06)(4.00)=\boxed{312}[/tex] grams.
Question 5
1000 atoms of calcium is the same as [tex]\frac{1.000}{6.022 \times 10^{23}}[/tex] moles.
This is equal to [tex]\frac{1000}{6.022 \times 10^{23}} \cdot 40.078=\boxed{6.7 \times 10^{-20}}[/tex] grams.
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For each item below determine the name, find it's molar mass, and it's percent composition
Answer:
Ag2CrO4
silver chromate, 331.966 g/mol
Ag=65%, Cr=15% O=19%
CH4
Methane, 16 g/mol
C=75% H=25%
Ca3(PO4)2
calcium Phosphate, 310 g/mol
Ca=38.7% P=20% O=41.3%
C7H5N3O6
227 g/mol
C=37% H=2.2% N=18.5% O=42.3%
K2C6H5O7
BAIDAR citron, 267 g/mol
CoCl2
Cobalt (ll) Chloride, 129.93
Explanation:
[tex]molar \: mass = m \div n \\ (m = mass \: of \: a \: substance \: in \: gram \: ) \\( n = no. \: of \: moles)[/tex]
Ag2CrO4
Ag=108, Cr=51.996, O=16
[tex]m = \frac{108 \times 2 + 51.996 + 16 \times 4}{1} \\ = 331.966[/tex]
Ag percentage in Ag2CrO4
[(108x2)/331.966]x100
=65%
Cr percentage in Ag2CrO4
[51.966/331.966]x100
=15%
O percentage in Ag2CrO4
[(16x4)/331.966]x100
=19%
CH4
C=12 H=1
12+1x4=16 g/mol
C percentage in CH4
(12/16)x100
75%
H percentage in CH4
(4/16)x100
25%
Ca3(PO4)2
Ca=40 P=31 O=16
40x3+31x2+16x8
=310 g/mol
Ca % in Ca3(PO4)2
[(40x3) /310]x100
38.7%
P % in Ca3(PO4)2
[(31x2)/310]x100
20%
O % in Ca3(PO4)2
[(16x8)/310]x100
41.3%
C7H5N3O6
C=12 H=1 N=14 O=16
12x7+1x5+14x3+16x6
227 g/mol
C % in C7H5N3O6
[(12x7)/227]x100
37%
H % in C7H5N3O6
[(1x5)/227]x100
2.2%
N % in C7H5N3O6
[(14x3)/227]x100
18.5%
O % in C7H5N3O6
[(16x6)/227]
42.3%
Do the same for BAIDAR cirton and Cobalt (||) Chloride percentage composition = [(mass of the elements x no. of elements) /molar mass of the molecule]x 100please add this on brainleist it took me long time to write
acetylcholine (ach) is released ____
A. calcium diffuses into the sarcoplasm
B. the troponin-tropomyosin complex changes shape
B. cross-bridges form.
Acetylcholine is released from the vesicles and into the synaptic cleft upon stimulation of the presynaptic terminal, where it is free to connect with receptors.
The release of ACh by motor neurons?The central nervous system's output neurons are known as motor neurons (MNs). Muscle contraction is a direct result of their activity. At the neuromuscular junction, MNs release acetylcholine (ACh), which was widely acknowledged by the 1940s.
What is acetylcholine's (ACh) function?Acetylcholine (ACh) is an organic chemical that serves as a neurotransmitter in the bodies and brains of numerous animal species, including humans. It is an ester of acetic acid and choline, which is how its name was derived from its chemical composition.
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How many grams of Na₂SO₄ are needed to completely precipitate the Ba²⁺ ions as BaSO₄ from 150 mL solution of 0.150 M BaCl₂ according to the balanced chemical reaction:
Na₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s) + 2 NaCl(aq)
How do i start? which is my starting point and I need help with the conversion ratios to complete the boxes
3.195 grams of Na₂SO₄ are needed to completely precipitate the Ba²⁺ ions as BaSO₄ from 150 mL solution of 0.150 M BaCl₂.
What is precipitation?Chemical precipitation is the process of changing a liquid into an insoluble form or supersaturating a solution in order to transform it into a solid. When two ionic bonds combine in an aqueous solution, a chemical process known as the precipitation reaction takes place, resulting in the formation of precipitates, an insoluble salt.
The equation becomes:
Na₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s) + 2 NaCl(aq)
1 mole 1 mole 1 mole 2 mole
Given that,
150 mL solution of 0.150 M BaCl₂.
Now, molar mass of Na₂SO₄ = (23×2 + 32 + 16×4) g/mol = 142 g/mol
Mole ratio Na₂SO₄ : BaCl₂ = 1 : 1
Moles of BaCl₂ formed = (0.150 mol/l) × (150/1000 L) = 0.0225 mol
Moles of Na₂SO₄ needed = (0.0225 mol) × (1/1) = 0.0225 mol
Mass of Na₂SO₄ needed = (0.0225 mol) × (142 g/mol) = 3.195 gm.
So, 3.195 grams of Na₂SO₄ are needed
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A chemist measures the temperature of a solution in °C. The measurement is denoted C, and is normally distributed with mean 40°C and standard deviation 1°C. The measurement is 1.8C32. What is the distribution of F? a) F N(104,3.24) b) F N(104,1.80) c) F N(40,3.24) d) F N(40,1.80)
Measurement of temperature by Chemist involving Mean and SD:
The distribution of F is (a) F = N(104, 3.24).
What is Mean and Standard deviation?A mean is calculated by dividing the total number of values by the sum of all the values. The term "average" is frequently used to describe this measure of central tendency.
In statistics, the measurement of variability known as the standard deviation (SD) is frequently utilized. It demonstrates how different things are from the norm (mean). While a high SD shows that the data are dispersed throughout a wide range of values, a low SD suggests that the data points tend to be close to the mean.
Calculation:As,E[ax+b]=aE(x)+b
Var(ax+b)=a∧2(Var(x))
Now, F=1.8C+32
E(F)=1.8×E(C)+32=1.8×40+32
E(F)=104
Var(F)=1.82×1=3.24
std_dev(F)=√(3.24)=1.8
So, F ≈ N(104,3.24).
Measurement of temperature by Chemist involving Mean and SD:
The distribution of F is (a) F = N(104, 3.24).
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An acetylene tank is fully charged at 250 psi, the pressure gauge is not reading acetylene pressure, but actually reading acetone pressure. a. Trueb. False
False, Acetylene is extremely flammable when under pressure and ignites spontaneously in air when pressures are more than 15 psi. Since acetylene cylinders are devoid of oxygen, they pose a risk of asphyxiation when released.
How much pressure should an acetylene bottle be under while it is full?The acetylene equipment's working pressure is crucial: A maximum acetylene pressure of 0.62 bar (9 psi) is permitted only with specially constructed equipment.
Is propane hotter than acetylene?Even though acetylene is hotter, it emits less heat. The most common preheating method uses oxygen and propane. This is true. Propane has more heat that is readily available.
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Based on your knowledge of the compounds and the visible light spectra, label the
compounds in increasing energy order of energy of the light that was emitted.
Lowest Energy
Lithium
Copper
Highest Energy
Calcium
Potassium
Barium
Sodium
Strontium
Lowest Energy: Lithium, Sodium, Strontium, Potassium, Copper, Calcium.
Highest Energy: Barium.
Energy is the capacity to cause change. It is the ability of a system to do work, and can take a variety of forms, such as kinetic, potential, electrical, chemical, thermal, and nuclear. Energy can be transformed from one form to another, but the total amount of energy in the universe is constant. Energy powers all living organisms, and is the driving force behind physical and chemical changes. Examples of energy transformations include light energy converted to heat energy, and chemical energy in food converted to mechanical energy in muscles. Through the use of renewable sources of energy, such as solar, wind and water, humans are able to use energy sustainably and reduce their impact on the environment.
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Convert 4.8 x 10-17 nanometers to meters.
The given 4.8 x 10⁻¹⁷ nanometers in meters is equal to 4.8 × 10⁻²⁶ m.
What is a nanometer?The nanometre or nanometer can be described as a unit of length in the International System of Units (SI) and is equal to one billionth (short scale) of a meter (0.000000001 m) and to 1000 picometres. In scientific notation, One nanometre can be expressed as 1×10⁻⁹ m.
Given, the length in nanometers = 4.8 x 10⁻¹⁷ nm
We know that the 1 nm = 1 × 10⁻⁹ m
1 nanometer is equal to meters = 1 × 10⁻⁹ m
4.8 × 10⁻¹⁷ nm will be equivalnet to meters = 4.8 × 10⁻¹⁷ × 10⁻⁹ m
4.8 × 10⁻¹⁷ nm = 4.8 × 10⁻²⁶ m
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Lab: Making Sparklers
Fuel Fe, Al or Mg
Oxidizer KNO₃ KCLO₃
Colorant
Total Mass 1.0g
The mass of the materials used in making sparklers is determined by the mole ratio of the reactants in the chemical reactions that occur.
What are sparklers?Sparklers are a kind of fireworks that do not explode but rather sparkle when they are lit.
The materials used in sparklers include materials such as:
Fuels such as iron, (Fe), aluminum (Al), or magnesium (Mg).
Oxidizers such as potassium nitrate( KNO₃) and potassium chlorate (KCLO₃).
Colorants that imbue color to the sparklers.
The reaction that occurs in sparklers is a chemical reaction. In sparklers, magnesium, aluminum, and iron each react with oxygen gas. The heat released from the reactions of the metal with oxygen causes the decomposition of the oxidizers such as potassium chlorate to potassium chloride and oxygen gas which is then used for further oxidation of the metals.
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Using the illustration to help, place these intermediates in the assimilatory nitrate reduction pathway in their proper space.
1. Nitrate 2. Nitrite 3. Nitroxyl 4. Hydroxylamine 5. Ammonia.
Assimilatory nitrate reduction: what happens?Nitrate is converted to nitrite via the assimilatory pathway, which is then further converted to ammonia—a source of nitrogen for biosynthesis—by assimilatory nitrite reductase.The dissimilatory route also converts nitrate to nitrite from nitrate.
What distinguishes assimilatory nitrate reduction from dissimilatory nitrate reduction?Dissimilatory & assimilatory nitrate reductases are thus genetically different in P. aeruginosa.To stop nitrate-based slow dissimilatory development, both enzymes must be lost.Both dissimilatory and assimilatory nitrate reductases need molybdenum to work properly.
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