5.845 mg of table salt provides the upper safe limit in the recommended daily requirement of sodium.
How to calculate mass percent of sodium?Molar mass of common table salt that is sodium chloride is 23.0+35.5=58.5 g/mole which is the addition of molar masses of sodium and chlorine,the constituents of sodium chloride.
As the common table salt is 39.3% sodium by mass therefore it has 23.01975 g or 23019.75 mg of sodium.
39.3/100×58.5=23019.75
As 58.5 g of sodium chloride has 23.019 g of sodium therefore 2.3 g of sodium is present in 5.845 g, which is 5.845×10[tex]^-3[/tex]mg.
2.3×58.5/23.019=5.845 mg.
Mass percent of any compound is usually calculated as mass of the compound divided by it's total mass and then multiplied by hundred.It is a way of expressing concentration of a component.It describes how much solute is present in 100 grams of solution.
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Which of the following is an inner transition element?
Group of answer choices
None of these
Ti
Rf
All of these
Th
Option E) Th is correct answer. Thorium (Th) is inner transition element.
The components that make up the f-block are those where the 4f and 5f orbitals gradually fill up. Although they are officially members of group 3, these elements are displayed separately in the f-block of the periodic table. Inner transition elements are another name for the f-constituent block's parts.Lanthanoids and actinoids are the names for the two series of inner transition elements that are 4f and 5f series, respectively. The inner transition elements U, Th, and Pa are excellent nuclear energy sources.The inner transition elements' electronic configuration is 4f1-14 5d0-16 s².Due to their uniform size and outer shell design, elements in a series would all have comparable qualities, making it difficult to distinguish them from one another.Hence, thorium is inner transition element.
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Complete the balanced dissociation equation for the compound below in aqueous solution. If the compound does not dissociate, write NR after the reaction arrow. Be sure to include the proper phases for all species within the reaction.
ZnCl2-
The balanced dissociation equation of the ionic compound ZnCl₂ is given below:
ZnCl₂ (aq)→ Zn²⁺ (aq) + 2 Cl⁻ (aq) What is a dissociation equation of a chemical reaction?A dissociation equation of a chemical reaction is a n equation which shows the products formed when an ionic substance is dissolved in an aqueous solution to produce ions.
A dissociation reaction results in the formation of ions and occurs only in ionic compounds
The dissociation of the ionic compound ZnCl₂ is shown below:
ZnCl₂ (aq)→ Zn²⁺ (aq) + 2 Cl⁻ (aq)From the equation above, the ionic compound zinc chloride is dissolved in water. The dissolution of the compound inn water results in the free dissociation or separation of the ions present in the crystal structure of the compound.
The compound dissociates to produce two moles of chloride ions and one mole of zinc (ii) ions. This is because the charge on the zinc ion is +2 while that on the chloride ion is -1.
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Graphite is a solid form of carbon that is commonly used in pencils. graphite breaks easily. What property of graphite makes it break easily.
The graphite is brittle in nature and this property makes the graphite to be break very easily or to make the graphite weak.
Graphite is a solid form of carbon that is commonly used in pencils. graphite breaks easily. What property of graphite makes it break easily?
Actually the graphite is naturally very brittle compound and the graphite can not be used as a material structure on its own due to its sheer planes.
The fact that why graphite is brittle is that the carbon atoms in the graphite are only bounded by the three strong covalent bonds in a two-dimensional 'layer lattice'.
The bonds inside the atoms of the carbon which is present in the layers of the graphite maybe strong but but the bonds that are formed by carbon atoms between layers are very weak, so that's why the graphite can be broken easily.
So we can conclude that the graphite is brittle in nature and this property makes the graphite to be break very easily or to make the graphite weak.
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Combustion analysis of an unknown compound containing only carbon and hydrogen produced 4.554 g of CO2 and 2.322 g of H2O. What is the empirical formula of the compound?
The empirical formula is C₂H₅.
Oxygen is used to burn a chemical during a combustion reaction. The products will be CO₂ and H₂O if the chemical comprises C and H. The products are the same if the compound additionally contains o, but less external O₂ is required for combustion. The same methodology is used to get the empirical formula: we measure the amount of CO and H₂O produced and work backward to determine the moles of C and H (and O by difference if that is the case).
The products are 4.554 g of CO₂ and 2.332 g of H₂O :
The amount of C in moles is:
= 4.554 g CO₂ × ( 1 mol CO₂ / 44.01 g ) × ( 1 mol C / 1 mol CO₂ )
= 0.1035 mol C
Similarly,
2.332 g H₂O × ( 1 mol H₂O / 18.02 g ) × ( 2 mol H / 1 mol H₂O ) = 0.2578 H
From the combustion of the compound, we obtained all the carbon and hydrogen. Hence, the ratios are:
C : ( 0.1035 / 0.1035 ) = 1
H : (0.2578 / 0.1035 ) = 2.49
Therefore, CH₂.₅
When we multiply CH₂.₅ by 2, we get C₂H₅.
The empirical formula of the compound is C₂H₅.
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Why is it difficult to precisely date samples from after the 1940's?
A. It is too close to the present to get an accurate reading from a half-life.
B. There aren't any radioactive isotopes that have a half-life short enough to date something that recent.
C. A major solar flare in the 1940's contaminated everything on the surface at that time with extra radioactivity.
D. Nuclear bombs contaminated the samples with more radioactivity.
It is difficult tp precisely date samples from after the 1940's is Nuclear bombs contaminated the samples with more radioactivity.
We use radioactive method to date the samples by using various radioisotopes and it gives a high degree of accuracy but this radioactive method may not work in future because of Nuclear bombs , nuclear reactors test started changing environment and this will lead to the difficulties in dating sample precisely.
Radiocarbon dating or carbon - 14 dating uses natural occurring radioisotope carbon - 14,It is used to determine the age of object from bones to plant fibers and wood, by the radiocarbon properties.
Thus , It is difficult tp precisely date samples from after the 1940's is Nuclear bombs contaminated the samples with more radioactivity.
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A 51.0 mL portion of a 1.60 M solution is diluted to a total volume of 288 mL. A 144 mL portion of that solution is diluted by adding 147 mL of water. What is the final concentration? Assume the volumes are additive
A 51.0 mL portion of a 1.60 M solution is diluted to a volume of 288 ml. A 155 mL portion of that solution is diluted by adding 147 mL of water, the final concentration is 0.140 M.
so, in this dilution occurs two times:
Initial concentration is C1 = 1.60 M
concentration after first dilution C2 = ?
volume V1 = 51.0 ml
volume V2 = 288ml
the dilution formula :
C1 × V1 = C2 × V2
C2 = (C1 × V1 ) / V2
= ( 1.60 × 51.0 ) / 288
= 0.283 M
Now, for the second dilution :
V2 = 144 mL
V3 = 147mL + 144mL= 291 mL ( diluted by adding water)
C2 × V2 = C3 × V3
C3 = (C2 × V2) / V3
= ( 0.283 × 144 ) / 291
= 0.140 M
Thus, A 51.0 mL portion of 1.60 M solution is diluted to a volume of 288 ml. A 155 mL portion of that solution is diluted by adding 147 mL of water, the final concentration is 0.140 M.
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matter can change phase by changing the amount of?
Answer:
Explanation:
Matter can change phase by changing the amount of Energy
How to balance NH3+NO=N2+H2O
Explanation:
NH₃+NO=N₂+H₂O;
NH₃+NO=N₂+6H₂O;
NH₃+6NO=N₂+6H₂O;
4NH₃+6NO=N₂+6H₂O;
4NH₃+6NO=5N₂+6H₂O.
naturally occuring strontium consists of four isotopes, Sr-84, Sr-86,Sr-87 and ser-88 what is the average atomic mass of stronium
The average atomic mass of naturally occurring strontium which consists of four isotopes, Sr-84, Sr-86, Sr-87, and Sr-88 is 87.1 amu.
To determine average atomic mass,
we take average of weight of all of the isotopes of that element.
Molecular weight of -
Sr-84 = 83.9 amu
Sr-86 = 85.9 amu
Sr-87 = 86.9 amu
Sr-88 = 87.9 amu
Average = 83.9 + 85.9 + 86.9 + 87.9 = 86.15
4
We'll see the abundance of each isotope of strontium. Since the most abundant isotope of strontium is Sr-88 with 82.6% abundance. Therefore, the average atomic mass of strontium is closest to the mass of Sr-88, and the other isotopes are less than this mass.
Hence, the atomic mass of strontium is, 87.1 amu.
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An analytical chemist measures the amount of Elements and in four samples of an unknown Substance :
An analytical chemist measures the amount of Elements and in four samples of an unknown Substance ;
as per the samples :
we have mass % of
[tex]E_1[/tex] in Sample 1 = 8.2g x 100/ 8.29 +18.99
= 30%
mass % [tex]E_1[/tex] in sample2 = 6.19 x 100/ 6.1 g +13.9 g
=30%
Similasly mass % of [tex]E_1[/tex]in sample 3 and sample are also 30%
Hence mass % [tex]E_2[/tex] in all samples are 70%
:. X is a pure substance
mass of sample x = 10.0g
mass of Element El = 30% of x
= 30 x 100g/ 100
= 3.og
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Find the value of x and y
Which option best describes the outer shell of the atoms in
Group 17 on this illustration of the Periodic Table?
O They have 7 protons.
OThey have 17 protons.
OThey have 7 electrons.
OThey have 17 electrons.
The option that best describes the outer shell of the atoms in Group 17 is they have 7 electrons.
What are the basic characteristics of group 17 elements?Group 17 elements such as chlorine, fluorine, etc have low bond dissociation energy due to their small atomic radius.
Basic characteristics include:
All the elements of group 17 have 7 electrons in its valence shell. These elements require one electron to finish their octet. They can complete their octet either by picking up an electron or sharing an electron.Thus, the option that best describes the outer shell of the atoms in Group 17 is they have 7 electrons.
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What is the job of a scientist why do scientits need government funding
Answer:
1. A scientist conducts and gathers research to gain knowledge in a particular area.
2. Many of the worlds problems include resources, energy, health, environment, climate, transportation, communication, etc. and will require solutions from science and engineering.
Calcium carbide, CaC2, is manufactured by reducing lime with carbon at high temperature. (The carbide is used in turn to make acetylene, an industrially important organic chemical.)
CaO(s)+3C(s)→CaC2(s)+CO(g) ΔH=464.8kJ
Calculate the quantity of energy, in kJ, transferred when 0.432 mol carbon reacts with CaO(s).
The energy that is transferred by 0.432 mol carbon is 200.79 kJ.
What is the heat of reaction?We know that the heat of reaction refers to the heat that was evolved or absorbed when reactants combine to form a product. The heat of reaction is positive when heat is absorbed and it is negative when heat is evolved.
Given the fact that we have the reaction; [tex]CaO(s)+3C(s) -------- > CaC_{2} (s) + CO (g)[/tex]→Ca[tex]C_{2}[/tex](s)+CO(g) ΔH=464.8kJ We are now required to obtain the quantity of energy, in kJ, transferred when 0.432 mol carbon reacts with CaO(s).
Given that;
1 mole of CaO transfers 464.8kJ of energy
0.432 mol carbon transfers 0.432 mol * 464.8kJ /1 mole
= 200.79 kJ
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Calculate the number of atoms in a 1.49×103 g sample of strontium.
The number of atoms in 1.49×10³ g sample of strontium is 1.02×10²⁵ atoms
Avogadro's hypothesis1 mole of strontium = 6.02×10²³ atoms
But
1 mole of strontium = 87.62 g
Thus, we can say that:
87.62 g of strontium = 6.02×10²³ atoms
How to determine the atoms in 1.49×10³ g of strontiumWe can determine the number of atoms in 1.49×10³ g of strontium as illustrated below:
87.62 g of strontium = 6.02×10²³ atoms
Therefore,
1.49×10³ g of strontium = (1.49×10³ g × 6.02×10²³ atoms) / 87.62 g
1.49×10³ g of strontium = 1.02×10²⁵ atoms
Thus, 1.02×10²⁵ atoms are present in 1.49×10³ g of strontium
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Determine the Reaction order, the Rate constant, k, and the units of k.
[A] (M) Ln [A] (M) t (s) 1/t (s)
0.850 -0.165 00.0 0.000
0.661 -0.414 30.0 0.0333
0.439 -0.823 60.0 0.0166
0.316 -1.15 90. 0 0.0111
Units of k:______
The Reaction order is first order, K is 0.0111 and Units of k is Sec⁻¹.
Reaction order = first order reaction
The Rate is constant,
equation ln[A] = -kt + ln[A]
= -0.165 = -K(0.000) + ( -0.165 )
k = o
K = 0.0333
k = 0.01660.0111
k =
Units of k. = Sec⁻¹
The rate constant, or the specific fee regular, is the proportionality steady inside the equation that expresses the connection between the charge of a chemical reaction and the concentrations of the reacting materials.
The rate constant, ok, is a proportionality constant that shows the relationship between the molar attention of reactants and the price of a chemical reaction. The rate regular can be found experimentally, the use of the molar concentrations of the reactants and the order of response.
The constant which defines the connection between the molar attention of the reactants and the charge of the chemical response is referred to as the fee regular. The rate steady is symbolized as okay.
Unit of rate constant = sec−1. The unit of fee consistent for a primary-order reaction is sec−1. For first-order reactions,
⇒equation ln[A] = -kt + ln[A]
zero is the same as the equation of a direct line (y = MX + c) with a -ve slope.
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How many hydrogen atoms are present in this molecule?
A: 6
B: 8
C: 9
D: 10
E: 13
How many grams of gold will fill up 5.00 cm3 of space if the density of gold is 19.3 g/cm3?
Round to the correct number of significant figures. Do not include the unit in the answer.
The gold will fill up 5.00 cm³of space if the density of gold is 19.3 g/cm³. Then the amount of gold filled in 5.00 cm³ of space is 96.5g.
What is density?Density is defined as the measurement of how tightly the material is packed together.
Density is defined as mass/volume.
The SI unit of density is gram/cubic centimeter.
Density can be expressed as
Density = mass/volume
As density is given as 19.3 gm/cm³ and volume is 5.00 cm³, then the mass can be calculated as
Mass = density x volume
= 19.3 x 5.00 = 96.5g
Thus, the amount of gold filled in 5.00 cm³ of space is 96.5g.
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The subatomic particles of an element are very important to that element and affect an element each in it's own way.
What are the three subatomic particles of an atom and what are their respective charges? If I wanted to figure out how to find the number of nuetrons, how could I use the atomic mass to find it?
Answer:
Explanation:
The three subatomic particles: protons with a positive charge, neutrons with a neutral charge, and electrons with a negative charge. The atomic mass can be found by adding the amount of protons and the amount of neutrons together. Therefore, you can find the number of neutrons in an atom by subtracting the number of protons from the atomic mass.
QUESTION 8 1 POINT
Which of the following statements does not accurately describe the precision of a measurement?
Select the correct answer below:
The precision is a measure of the spread of expected values for a given measurement.
The precision describes the closeness of replicate measurements of the same property.
The precision can be quantified as the standard deviation of a set of data.
The trueness is a measure of how close a measurement is to an accepted value.
The statements 'The precision is a measure of the spread of expected values for a given measurement .' does not accurately describe the precision of a measurement .
Precision refers to how close measurements of the same item are to each other . Precision is independent of accuracy . That means it is possible to be very precise but not very accurate, and it is also possible to be accurate without being precise . The best quality scientific observations are both accurate and precise .
It is also define in one term as the quality or state of being precise .
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What is the correct conversion factor and the answer?
what is equivalent to 2ATM
ii) Which arrow shows the direction of the force of the spring on the ball? Tick the correct box
Answer:
b
Explanation:
i just randomly give the answer because of the reason you didn't gave the example
Why does copper have a high thermal and electrical conductivity
Answer:
because it is good conductor of electricity
The picture shows a model of a helium atom and a model of a lithium atom. Which of the following statements is true about the lithium and the helium atoms? A. Helium has more protons, neutrons, and electrons. B. There is no difference between helium and lithium. C. Lithium has more protons, neutrons, and electrons. D. Lithium is much smaller than helium.
Answer:
C. Lithium has more protons, neutrons, and electrons.
Answer: C. Lithium has more protons, neutrons, and electrons.
Explanation:
How many grams of CCl4 are needed to make a 1.20 m solution in 450g of octane?
There 83.2g of CCl4 are needed to make a 1.20 m solution in 450g of octane.
An octane score, or octane wide variety, is a popular measure of a gasoline's potential to face up to compression in an internal combustion engine without detonating. The higher the octane variety, the greater compression the gas can withstand before detonating. Octane rating is the measure of a fuel's ability to face up to knocking or pinging all through combustion, as a result of the air and fuel combination detonating prematurely in the engine.
Octane's legs are made from platinum, stated by using Octane whilst you reach Platinum IV in ranked announcing, Platinum rank to suit my legs Octane will be addicted to his Stim, together with his regular twitching within the in-game lobby and his use of the stim without apparent usage in trailers and teasers. considering Octane was envisioned with a mask, there's not anything beneath there that can make exceptional faces. Parra explained that because of this, he could have a clean expression for the whole thing.
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How had the New Deal given the government an advantage in preparing for war?
A. The New Deal focused on creating jobs in the weapons industry.
B. Farmers had been encouraged to plant more crops, making more food
C. The government owned a lot of the peoples' debt, and could ask for favors.
D. The government had become closely involved in social and economic affairs
A 3 column table with 7 rows. The first column is labeled color with entries red, orange, yellow to white, white, white to blue, blue, blue. The second column is labeled surface temperature in Kelvin with entries under 3500, 3500 to 5000, 5000 to 6000, 6000 to 7500, 7500 to 11000, 11000 to 25000, greater than 25000. The last column is labeled average mass in solar masses with entries, 0.3, 0.8, 1.1, 1.7, 3.2, 18, 60.
Arcturus is a star whose surface temperature is 4290 K.
What is most likely the color of Arcturus?
What is most likely the mass of Arcturus?
about
solar masses
From the table as we can see it ;
The color of the star is orangeThe average mass of the star is 0.8What is a table?A table is often used for the representation of information. We know that a table has to have columns. Each of the columns could be used to show particular variable. Now we have the temperature, the color and the mass of different stars showed on the table as we can see it in the question.
We now have the assignment to find the color and mass of the start that corresponds to a temperature of about 4290 K hence we have to look intently at the table.
Color of the star - Orange
Average Mass of the star - 0.8
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Answer: What is most likely the color of Arcturus? ORANGE
What is most likely the mass of Arcturus? about 0.8 solar masses
Explanation: just did the assignment
Which of the following is true about the number of subatomic particles of the element Argon (Ar)?
a. It has 18 protons, 18 electrons, and 22 neutrons.
b. It has 18 protons, 18 electrons, and 42 neutrons.
c.It has 22 protons, 22 electrons, and 18 neutrons.
d. It has 22 protons, 22 electrons, and 22 neutrons.
Answer:
A
Explanation:
how is phenol and ethanal distinguish
Alcohol is almost neutral in nature, whereas phenol has a weak acidic nature. The reaction with neutral FeCl3 distinguishes between ethanol and phenol.
Why phenol is acidic but ethanol is neutral?A phenoxide ion, or similar particle, is created when a phenol molecule loses its hydrogen ion. Since this phenoxide ion is resonance stabilized, its nature is acidic. However, when an ethanol molecule loses its hydrogen ion, it creates an ion.
Distinguish between alcohol and phenol and ethers :A saturated carbon atom bonds with a hydroxyl (-OH) group to produce alcohol. When the -OH group is substituted for a hydrogen atom in a benzene molecule, phenol is created. When an oxygen atom is joined to two alkyl or aryl groups, ether is created.
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