For the harvesting of salt from seawater, solar energy is used. To evaporate seawater, solar energy is used. As the concentration of the salt increases, it crystallizes.
What is renewable source of energy?Renewable energy is defined as energy derived from natural sources that is replenished at a faster rate than it is consumed.
Sunlight and wind are two examples of such constantly replenishing sources. Renewable energy sources are plenty and are all around us.
Solar energy is utilized to get salt from seawater. Solar energy is used to evaporate seawater. The salt crystallizes as its concentration increases.
Thus, this way, salt extraction can be done using a common renewable energy source.
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write the following measurement in scientific notation. The convert each measurement into SI base units. a. 0.0000000000372 b.45,000,000,000
Answer: a) 3.72 x [tex]10^{-11}[/tex]
b) 4.5 x [tex]10^{10}[/tex]
Explanation:
a. 0.0000000000372
= 3.72 x [tex]10^{-11}[/tex]
b. 45,000,000,000
= 4.5 x [tex]10^{10}[/tex]
If 10m3of nitrogen at 30oc and 125 kpa are expanded isothermally to 25m3, what is theresulting pressure?
The resulting pressure of nitrogen is 50 kPa.
Use Boyle's Law (the pressure volume law).
According to this law - volume of a given amount of gas held varies inversely with the applied pressure when the temperature and mass are constant.
p₁V₁ = p₂V₂
V₁ = 10 m³; initial volume of nitrogen gas
p₁ = 125 kPa; initial pressure of nitrogen gas
V₂ = 25 m³; final volume of nitrogen gas
p₂ = ?; final pressure of nitrogen gas
125 kPa × 10 m³ = p₂ × 25 m³
p₂ = (125 kPa × 10 m³) ÷ 25 m³
p₂ = 50 kPa
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What volume in ml of 0.3000 m nacl solution is required to produce 0.2150 moles of nacl?
710 mL volume in ml of 0.3000 m nacl solution is required to produce 0.2150 moles of nacl.
What is meant by moles?In chemistry, a mole, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles. The mole designates 6.02214076 1023 units, which is a very large number. The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities. The term "mole" refers to an extremely large quantity of molecules, atoms, or other particles and is used as a unit of measurement in chemistry.Molar Concentration = number of moles/ volume
volume = number of moles/ molar concentration
volume = 0.2150/ 0.3000 = 0.71 L
volume required = 0.71 L = 0.71L× 1000 mL/L = 710 mL
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Which solution has the higher boiling point: 26.4 g c2h6o2 in 0.500 kg of h2o or 22.0 g nacl in 0.500 kg of h2o?
The NaCl solution will have higher boiling point.
The temperature at which the vapour pressure equals the typical air pressure at sea level is known as the normal boiling point.
A molecular compound is [tex]C_{2} H_{6} O_{2}[/tex]. Meaning that it will continue to be in this state after dissolving:
[tex]C_{2} H_{6} O_{2}[/tex] ⇒ [tex]C_{6} H_{12} O_{6}[/tex] (aq)
Ionic materials include sodium chloride (NaCl). In other words, it will produce ions when it dissolves:
NaCl(s) ⇒ [tex]Na^{+}[/tex](aq) + [tex]Cl^{-}[/tex] (aq)
[tex]C_{2} H_{6} O_{2}[/tex] is a molecule and NaCl is an ionic substance. The boiling points of ionic compounds are higher than those of molecular molecules. NaCl will therefore have a higher boiling point.
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what happens when negative charge collied with neutral gas molecules in cathode ray tube?
Answer:
This collision makes the electron in the cathode free. These electrons undergo collision with neutral atoms of the gas and ionize them to form ions. The positive ions thus produced move toward the oppositely charged cathode and electrons move towards the anode
HOPE IT'S HELPS YOU56.983 +1.8234 + 125 +2.12 =
Solve in significant figures
A sample of a compound containing boron (b) and hydrogen (h) contains 7.078 g of b and 1.980 g of h. the molar mass of the compound is about 30 g. what is its molecular formula?
[tex]B_{1*2} H_{1*2} = B_{2} H_{2}[/tex] is required its molecular formula.
Boron can form how many bonds?As a result, boron frequently forms three bonds, BH 3 start text, end text, start subscript, 3, end subscript, with a total of six electrons in the outermost shell. This causes some unusual properties in boron compounds because they are "short of electrons."
First calculate the empirical formula and mass. Compare the molecular mass to the empirical mass to determine the molecular formula.
Empirical Formula
Calculate the moles of boron and hydrogen. (Molar masses: B = 7.078 g/mol; H = 1.980 g/mol)B: 6.444 g × 1 mol/ 7.078 g = 0.9104 mol
H: 1.803 g × 1 mol/1.980mol = 0.9106 mol
Calculate the mole ratios by dividing the moles of each element by the least number of moles.
B: 0.9104 mol/0.5961 mol = 1.5273
H: 0.9106 mol/0.5961 mol = 1.5276
The empirical formula is BH.
Calculate the empirical formula mass.
10.81 + (1 × 1.008) = 11.818
Molecular formula
30/11.818 = 2.5385 ≈ 2
Multiply the subscripts in the empirical formula by 2.
B₁ₓ₂[tex]H_{1}[/tex]ₓ₂ = B₂[tex]H_{2}[/tex]
This compound is diborane and its molar mass is 27.67 g/mol. If you go back and divide the molecular mass by the empirical mass, the result is 2.000. So B₂[tex]H_{2}[/tex]is the correct molecular formula. (27.67/ 11.818= 2.34).
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Given the balanced equation:
2 Al + 6 NaOH --------> 2 Na3AlO3 + 3 H2
What mass, in grams, of Na3AlO3 is produced when 6 x 10^23 molecules of NaOH is consumed?
explain
a) 240 b) 80 c) 64 d) 9.6 e) 48
47.78 grams of Na₃ AlO₃ is produced when 6 × 10²³ molecules of NaOH are consumed.
An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and the total charge for each component of the reaction.
The balanced equation:
2 Al + 6 NaOH --------> 2 Na₃ AlO₃ + 3 H₂
We have 6 × 10²³ molecules of NaOH.
So, the mass of Na₃ AlO₃ will be:
= 6 × 10²³ molecules NaOH × ( 1 mol NaOH / 6.023 × 10²³ molecules NaOH ) × ( 2 mol Na₃ AlO₃ / 6 mol NaOH) × ( 143.9 g Na₃AlO₃ / 1 mol Na₃ AlO₃ )
= 47.78 g Na₃ AlO₃
The mass of Na₃ AlO₃ produced when 6 × 10²³ molecules of NaOH are consumed is 47.78 grams.
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Upon heating a sample of nicl2•6h2o, a sample originally weighing 3. 5 g yields an anhydrous salt residue weighing 2. 1g. How many moles of water were in the sample?.
7.8×10⁻² moles of water were in the sample of the salt
m(NiCl₂·6H₂O) = 3.5 g; mass of a hydrous salt
m(NiCl₂) = 2.1 g; mass of an anhydrous salt
m(H₂O) = m(NiCl₂·6H₂O) - m(NiCl₂)
m(H₂O) = 3.5 g - 2.1 g
m(H₂O) = 1.4 g; mass of water
M(H₂O) = 18 g/mol; the molar mass of water
n(H₂O) = m(H₂O) ÷ M(H₂O)
n(H₂O) = 1.4 g ÷ 18 g/mol
n(H₂O) = 0.078 mol; amount of water in the sample
The mole is an SI unit which measures the number of particles in substance. One mole is equal to 6.022·10²³ atoms.
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A fictitious element x has an average atomic mass of 122. 224 u. Element x has two naturally occuring isotopes. The most abundant isotope has an isotopic mass of 121. 560 u and a relative abundance of 63. 89%. Calculate the isotopic mass of the least abundant isotope
Element x is unbibium has an average atomic mass of 122. 224 u and isotopic mass of the least abundant isotope is 237.03
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons and the number of protons in a nucleus determines the element's atomic number on the periodic table called isotopes
Unbibium, also known as element 122 or eka-thorium, is the hypothetical chemical element in the periodic table with the placeholder symbol of Ubb and atomic number 122 and unbibium has two isotopes ³⁷⁴Ubb and ³⁷¹Ubb and this abundant isotope has an isotopic mass of 121. 560 u and a relative abundance of 63. 89% and the isotopic mass of the least abundant isotope is 237.03
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Within a water molecule, the electrons spend most of their time attracted more closely to?
Within a water molecule, the electrons spend most of their time attracted more closely to Oxygen atom.
What are electrons ?An electron is a negatively charged subatomic particle that can exist either free or bonded to an atom (not bound). An atom has three primary types of particles: protons, neutrons, and the electron, which is bound to it. Together, protons, neutrons, and electrons make up the atom's nucleus.
In nature, electrons can be found both bound inside of atoms and unbound (free electrons). The part of an atom that is negatively charged is caused by electrons. Electrons revolve around the atomic nucleus, which is positively charged, in an atom. In solids, electrons serve as the main conductor of current.
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Please help this has to be done soon
how many atoms are in 7.2mol of sodium? step by step answer
Answer:
4.34 times 10^24
Explanation:
number of atoms=7.2 times Avogadro's number
=7.2 times 6.02 times 10^23
=4.34 times 10^24
Answer:
Explanation: we will multiple the amount of moles to the Avogadro's number for example:
7.2*6*10 to the power 23
You have a solid object of unknown composition and mass. You determined that when this object absorbed 1.000 x 10^2 j, its temperature increased by 2.0k. Calculate the object's heat capacity.
Given,
Solid object with an unknown mass
Heat absorbed = 1 x 10² J
Temperature change = 2 K
Before calculating the object's heat capacity let us know what is heat capacity-
Heat capacity is the amount of heat required to raise the temperature of an object by a unit.Heat capacity is the ratio of heat absorbed by an object to the temperature change.q= CΔT
∴ C = q/ΔT
Here,
C= Heat capacity
q= Heat absorbed
ΔT =Temperature change
C = 1x10² / 2
C = 100/2
C = 50 J/K
Hence, heat absorbed is 50 joule/ kelvin.
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Heat Capacity is 50 J/K.
Given, a solid item of undetermined mass
Absorbed heat equals 1 x 10² J
Change in temperature = 2 K
Let's first define heat capacity so that we can calculate the heat capacity of the object:
• Heat capacity is the amount of energy needed to raise an object's temperature by a unit.
•A physical characteristic of matter is its capacity for heat or thermal energy.
• The proportion of absorbed heat to temperature change is known as the heat capacity.
q= CΔT
∴ C = q/ΔT
Here,
Heat capacity = C
q = Heat taken in
Change in temperature= T
C = 1x10² / 2
C = 100/2
C = 50 J/K
Hence, Heat Capacity is 50 joule / kelvin.
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How many sp3-hybridized carbon atoms are present in the structure of cyclopentadiene?
One sp3-hybridized carbon atom is present in the structure of cyclopentadiene.
Cyclopentadiene is an organic compound (diene) with the formula C₅H₆ (see the picture below).
In cyclopentadiene there is four carbon atoms with sp2 hybridized carbon and one carbon atom with sp3-hybridized carbon.
When carbon atom is sp2 hybridized, it has three sp2 orbitals and one p orbital. Carbon has four bonds in total (two single and one double bond)
In sp3 hybridization hybridize one s-orbital and three p-orbitals of carbon atom. Carbon atom with sp3 hybridization has four single bonds. In the picture below, that is an an atom on the top.
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How many atoms of carbon (C) are present in the reactants of the following chemical equation?
C7H16+O2
CO2 + H₂O
(1 point)
O 7 atoms
16 atoms
O1 atom
O 23 atoms
The number of atoms present in reactants of the following chemical equation C₇H₁₆ + O₂ = CO₂ + H₂O is 7 atoms.
How to count number of atoms?The number of atoms in a compound is shown in the chemical formula of the compound.
A chemical formula is a notation indicating the number of atoms of each element present in a compound.
According to this question, the chemical reaction between heptane and oxygen is given as follows:
C₇H₁₆ + O₂ = CO₂ + H₂O
The chemical formula of hexane shows that carbon has 7 atoms in the reactant side.
Therefore, the number of atoms present in reactants of the following chemical equation C₇H₁₆ + O₂ = CO₂ + H₂O is 7 atoms.
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Which statement about the heliocentric theory is correct?
A. Heliocentric theory is a set of predictions describing the Sun as being the center of the solar system.
B. Heliocentric theory is a set of testable explanations describing the Sun as being the center of the solar system.
C. Heliocentric theory is a set of guesses describing the Sun as being the center of the solar system.
D. Heliocentric theory is a set of laws that describe the Sun as being the center of the solar system.
Please hurry I need this now T-T
Why is it necessary to couple some biochemical reactions to the hydrolysis of atp (for example, in the synthesis of glutamine from glutamic acid)?
It is necessary to couple some biochemical reactions because individually some biochemical reactions have +ΔG and coupling them together makes helps to make the overall reaction -ΔG.
Reactions that have a positive value of Gibbs free energy, require additional energy to complete, which can be obtained when it is coupled with the hydrolysis of ATP.
Also, the biochemical reaction which has a negative value of ΔG is non-spontaneous in nature. For those to become spontaneous, the value of ΔG should be negative. The coupling of reaction makes their Gibbs free energy negative and makes them spontaneous.
Therefore it is necessary to couple biochemical reactions to the hydrolysis of ATP.
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CuSO4 + BaCl2 → BaSO4 + ?
BaCl2 + CuSO4 → BaSO4 + CuCl2
If an aqueous solution has a hydrogen ion concentration of 10^-5 what is the concentration of m hydroxyl ion?
The concentration of hydroxyl ion is 10^-9 M.
When an electrolyte is dissolved in water, it dissociates into ions.
In the above case, the ions are hydrogen (H+) and hydroxyl (OH-).
At a temperature of 298 K,
The ionic product(Kw of water is
Kw = [H+] [OH-] = 10^-14
Here [H+] = Concentration of hydrogen ions
[OH-] = Concentration of hydroxyl ions
Assuming that the above solution is at a temperature of 298 K, the ionic product(Kw) of water is
10^-14 = [10^-5] [OH-]
[OH-] = 10^-9.
Thus, the concentration of hydroxyl ions is 10^-9 M.
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The height of water in a water barometer is 883 cm at 20˚c. The density of water at 20˚c is 0. 998 g•cm-3. What is the pressure?.
The pressure is 8.81 cm of Hg.
The height of the water in the water barometer is h.
h = 883 cm = 8.83 m
The density of water at 20 ° C is p.
p = 998 g/cm³
The gravity of the earth is g.
g = 1 m/s²
The pressure is,
Pressure = Height × Density × Gravity
P = h × p × g
P = 8.83 × 9.98 × 1
P = 8.81 cm of Hg
Therefore, the pressure is 8.81 cm of Hg.
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How many grams of phosphorus are present in 3.51 moles of phosphorus trichloride?
108.81 grams of phosphorus are present in 3.51 moles of phosphorus trichloride PCl3. The molecular formula of Phosphorus trichloride is PCl3.
How many moles of phosphorus trichloride in 1 gram The answer is 0.0072815837438818. Suppose you are converting between moles and grams of phosphorus trichloride. You can view details for each unit of measure. Molecular weight or grams of phosphorus trichloride The molecular formula of phosphorus trichloride is PCl3.
The SI base unit of substance quantity is the mole.
1 mole equals 1 mole of phosphorus trichloride or 137.332761 grams.
1 mol PCl₃=6.022×10²³molecules
3.51mol PCl₃ =3.51×6.022×10²³
=2.11x10²⁴
Number of atoms present in 1 molecule of PCl₃ =4
108.81 grams of phosphorus are present in 3.51 moles of phosphorus trichloride PCl3. The molecular formula of Phosphorus trichloride is PCl3.
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Which of the responses includes all of the following that can form hydrogen bonds with water molecules? i. na , ii. ch3cooh, iii. c2h6, iv. ch3nh2
The responses that can form hydrogen bonds with water molecules are
II. CH₃COOH and IV. CH₃NH₂.
Acetic or ethanoic acid (CH₃COOH) has hydrogen atom bonded to an oxygen atom, so it can form hydrogen bonds with water molecules (see the picture below).
Methylamine (CH₃NH₂) has hydrogen atom bonded to a nitrogen atom, so it can form hydrogen bonds with water molecules.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.
Sodium (Na) and ethane can not form hydrogen bonds, because they do not have a hydrogen atom bonded to flourine (F), oxygen (O) and nitrogen (N) atoms.
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At stp, 1 mole of gas has a molar volume of 22.4 l. what is the density (g/l) of oxygen at stp?
The density of oxygen is 1.43 g/LC.
The periodic table's Group 16 (also known as the oxygen group) contains the nonmetallic chemical element oxygen (O). Oxygen is a colorless, odorless, and tasteless gas that is necessary for all living things. Animals take it up and then change it into carbon dioxide, which plants then use as a source of carbon and release the oxygen back into the atmosphere.
As well as reactions that remove elements from their combinations with one another, oxygen can react with nearly any other element to produce compounds. These reactions, which are frequently accompanied by the evolution of heat and light, are known as combustions. Water is the most significant component.
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A solution is prepared by dissolving 1.928 g of kno3 into enough water to make 651 ml. what is the molarity of the solution?
a) 0.159 m
b) 0.381 m
c) 0.0293 m
d) 2.48 m
e) 0.0832 m
0.0293 m is the molarity of the solution 1.928 g of kno3 into enough water to make 651 ml.
What is molarity ?Molar concentration, also known as molarity, quantity concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as an amount of substance per unit volume of solution. The number of moles per liter, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution is referred to as one molar, or 1 M.
Because most solutions' volumes only slightly vary with temperature due to thermal expansion, the use of molar concentration in thermodynamics is frequently not practical. Most of the time, this issue may be rectified by adding temperature correction factors or by utilizing a temperature-independent metric.
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A recipe for spaghetti sauce requires 2.5 cups of tomato sauce. If only metric
measures are available, how many milliliters of tomato sauce is needed?
(1qt = 4 cups, 1q = 946 mL)
The volume of the sauce required is 529.76 mL
What is the volume?
The volume has to do with the space that is occupied by an object. We can see that the unit that has been given for the spaghetti sauce is in the non standard unit of cups of tomato sauce. We are now asked to express this value in the metric unit of milliliter.
We have that;
1qt = 4 cups
x = 2.5 cups
x = 1qt * 2.5 cups/4 cups
x = 0.56 qt
Also;
1q = 946 mL
0.56 qt = 0.56 qt * 946 mL/1q
= 529.76 mL
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can anyone show the working steps?
Volume of potassium hydroxide that can neutralise 25 cm³ of H2Z acid solution is 5cm³
Diprotic acid is that acid which contains two hydrogen atoms and can release or ionise in water, such as carbonic acid and sulphuric acid.A neutralisation reaction is a chemical process in which an acid and a base combine to produce salt and water as the end products.The neutralization reaction is
H2Z + 2KOH → K2 H2Z + 2H2O
H2Z acid is diprotic acid as it has two ionizable hydrogens.
Thus, 1 mole of Z acid will neutralize 2 moles of KOH.
The number of moles of phosphorus acid present in 0.025 dm³ of 0.5 M aqueous solution is 0.1×
= 0.0025
They will neutralize 2×0.0025mol = 0.005 moles of KOH.
The molarity of KOH solution is 1.0 mol dm³
The volume of KOH solution required will be
1.0 × 0.005 = 0.005 dm³ = 5cm³
Hence, volume of KOH solution required will be 5 cm³.
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Which of the following has the highest gravitational potential energy?
A truck at the top of a hill has the highest gravitational potential energy. So, the correct option is (a).
The energy that an item has or acquires when its location changes as a result of being in a gravitational field is known as gravitational potential energy. Gravitational potential energy can be defined as an energy that has a connection to gravitational force or gravity.
According to classical mechanics, the work per unit mass required to move an object from a set reference site to a given location is equal to the gravitational potential at that location. With mass assuming the function of charge, it is comparable to the electric potential.
Therefore, a truck at the top of a hill has the highest gravitational potential energy.
The complete question is: Which of the following has the highest gravitational potential energy?
a) a truck at the top of a hill
b) a bike speeding down a hill
c) a dog at the top of a hill
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What are the minimum numbers of terminals required on an integrated-circuit package containing three op-amps? group of answer choices
The minimum no of pins required by dual-op-amp is 8. Each op-amp has 2 input terminals(4 pins) and one output terminal(2 pins). Another 2 pins are required for power.
What is dual-op-amp?An operational amplifier is a high-gain, DC-coupled electronic voltage amplifier with differential input and typically single-ended output. An op amp in this setup generates an output potential (relative to circuit ground) that is typically 100,000 times greater than the potential difference between its input terminals. Operational amplifiers were first employed in analog computers to carry out mathematical operations in linear, non-linear, and frequency-dependent circuits.
The op amp's popularity as a component in analog circuits stems from its adaptability. By adopting negative feedback, the properties of an op-amp circuit, such as its gain, input and output impedance, bandwidth, etc., are defined by external components and have no influence on temperature coefficients or technical tolerance in the op amp itself.
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In+a+first+order+decomposition,+19.24%+of+a+compound+decomposes+in+81.9+minutes.+what+is+the+value+of+k+for+the+reaction+in+min-1? (value ± 2%)?
The value of k for the reaction in min is 66.5 min will take 82.3% of the compound to decompose.
What is first order reaction?A first-order reaction is a chemical process in which the rate of the reaction is linearly correlated with the concentration of just one ingredient. In other words, a first-order reaction is a chemical reaction in which only one of the reactants experiences variations in concentration, and this causes the rate of the reaction to vary.
The concentration of one of the reactants determines the first-order reaction rate. The product of the concentrations of two reactants or the square of the concentration of a reactant determines the second-order reaction rate.
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