Answer:
D
Explanation:
because all cells in our body help us to build the body because they are multicellular
Answer: D) building blocks of all living things
Explanation:
A lake contains 0.05 mg po4 3- /l (orthophosphate). what is the concentration expressed in:
The answer is ppm that is parts per million.
This stands for "parts per million" and can also be written as mg/L (milligrams per liter). The mass of a chemical or contamination per volume of water is the unit of measurement here. On a lab report, ppm or mg/L both mean the same thing. The solution makes up 0.0001 percent of 1 PPM. It is equivalent to 1 mg in other measures like milligrams per kilogram, milligrams per liter of water, etc. Additionally, it is the 1/1,000,000th of something. PPM stands for one (1/,000,000) (defect or incident). Previously, suppliers were deemed to be of high quality if their failure rate was less than 10,000 PPM, or 1%.
The complete question is- A Lake Contains 0.05 Mg PO 2-/L (Orthophosphate). What Is the Concentration Expressed In:
A. Ppm
B. M (Molar)
C. Mg PO-P/L
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H3C
ОН
С.
Н
CH3
what is the name of molecule y
[tex]H_3[/tex]CОНС = acetaldehyde also known as ethanal ( It is a carbonyl compound)
НC[tex]H_3[/tex] = methane ( it is a hydrocarbon of alkane group)
Methane is a colorless odorless flammable gaseous hydrocarbon C[tex]H_4[/tex] that is a product of decomposition of organic matter and of the carbonization of coal, is used as a fuel and as a starting material in chemical synthesis, and is the simplest of the alkanes. methane gas produced when vegetation decomposes in waterethanal is a Volatile liquid - collect in ice bath and Colourless, its Density: 788 kg/m³ , its Molar mass: 44.05 g/mol and its Melting point: -190.3°F (-123.5°C)To know more about acetaldehyde visit :
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What is the hydrogen-ion concentration in a solution formed by titrating 200. ml of 0.16 m hcl with 300 ml of 0.091 m naoh at 25 c?
Hydroxide ion concentration - 0.0094 M. The concentration of hydrogen ions is more conveniently expressed as pH, The logarithm of the reciprocal of the concentration of hydrogen ions in gram moles per liter.
What is Titration?Titration is a common quantitative chemical analysis laboratory technique used to calculate the concentration of a specific analyte. Titrimetric and volumetric analysis are other terms for it (a substance to be analyzed). As the reagent, also known as the titrant or titrator, a standard solution with known concentration and volume is prepared. The titrant reacts with an analyte solution to determine the concentration of the analyte (also known as the titrant). The amount of titrant that interacted with the analyte is referred to as the titration volume. Titration is the slow addition of a known concentration solution (called a titrant) to a known volume of an unknown concentration solution until the reaction reaches neutralization, which is often indicated by a color change.The acid-base reaction equation is as follows:
HCl + NaOH ---> NaCl + H₂O
stoichiometry of HCl to NaOH is 1:1
number of HCl moles - 0.16 mol/L x 0.200 L = 0.032 mol
number of NaOH moles - 0.091 mol/L x 0.300 L = 0.0273 mol
The limiting reactant is NaOH therefore the number of HCl moles reacted - 0.0273 mol
the excess amount of HCl moles is - 0.032 - 0.0273 = 0.0047 mol
since HCl is a strong acid
total volume - 200 mL + 300 mL = 500 mL
[HCl] = [H⁺]
therefore [H⁺] = 0.0047 mol / 0.500 mL
[H⁺] = 0.0094 mol/L
hydroxide ion concentration - 0.0094 M
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Select the product or products formed by the proton transfer reaction that occurs when these two substances interact:________
Select the product or products formed by the proton transfer reaction that occurs when these two substances interact: Arrhenius acids.
What is Arrhenius acids?Communication between two or more computer applications is made possible via application programming interfaces (APIs). It is a kind of software interface that provides a service to other software. An API specification is a document or a standard that outlines how to create or use a connection or interface of this type. The term "implement" or "expose" refers to a computer system that conforms to this standard. A specification or an implementation may both be referred to as an API.
An application programming interface, as opposed to a user interface, links computer systems to people, while a user interface does the opposite.
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what is the valency of elements in the group 'v' of the modern periodic table? what is the reasons for the fact that reactivity of group 'v' elements decrease as we go down in the group?
Answer:
What is the valency of elements in the group 'v' of the modern periodic table?
Answer: -3
What is the reasons for the fact that reactivity of group 'v' elements decrease as we go down in the group?
Answer: On moving down the group, there is a decrease in the electron affinity of elements. It is because, as the size of an atom increases, the valence electrons get further away from its nucleus. Thus, the attraction between them decreases.
Compare the density values for the solid in part II. The actual density of our solid is 8.9 g/mL. Are the densities of the solid precise and accurate? Explain your answer.
[Answer on your own using the previous question as a guide.]
Part II: Density of Irregular-Shaped Solid – record volume with 1 place after the decimal
Mass of solid (g) [4]
38.951
43.830
41.418
Volume of water (mL) [5]
52.0
51.2
52.4
Volume of water and solid (mL) [6]
56.5
56.1
57.1
The values are not precise but they are accurate because they are all close to the true value of 8.9 g/mL.
What is the density?The density of a solid refers to the ratio of the mass to the volume of the object. This ratio is an intrinsic property because we could use it to identify a substance. In this case, the density of a substance can tell us exactly what the substance is.
Now let us try to obtain the density of the object in each case;
Case 1 = 38.951/56.5 - 52.0 = 8.7 g/mL
Case 2 = 43.830/56.1 - 51.2 = 9.1 g/mL
Case 3 = 41.418/ 57.1 - 52.4 = 8.8 g/mL
It is clear that the values are not precise but they are accurate because they are all close to the true value of 8.9 g/mL.
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Yucca mountain, nevada is a potentially viable site for nuclear waste disposal because:________
Yucca Mountain, Nevada is a potentially viable site for nuclear waste disposal because it is an arid desert with very less precipitation and minimal contamination due to the nuclear waste.
Yucca Mountain, Nevada is a wide stretch of 160 km of dry desert with very little rainfall. This area is mainly composed of dense volcanic rock which contains minute pores which make the process of rainwater infiltration very slow and restricting.
Also, the nuclear waste will be stored in such a way that it is far above the water bodies of the mountain. This way the threat of water contamination is also out of question.
These all factors would effectively protect the waste and prevent the leak of harmful radioactive radiation from the disposal storage.
That being the case, Yucca Mountain, Nevada is a potentially viable site for nuclear waste disposal.
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What is the concentration in mass-volume percent for 13.9 g caf2 in 255 ml of solution?
The concentration in mass-volume percent of the solution is: 5.45 %
To solve this problem the formula and the procedure that we have to use is:
% m/v = m(solute)/v(solution) * 100
Where
% m/v = concentration in mass volume percentm = mass of solutev = volume of solutionInformation about the problem:
m(solute)= 13.9 gv(solution)= 255 ml% m/v =?Applying the concentration formula we get:
% m/v = m(solute)/v(solution) * 100
% m/v = (13.9 g/255 ml) * 100
% m/v = 0.0545 *100
% m/v =5.45 %
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
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The pressure in a 100.0 mL container is 125.0 kPa at 25 degrees celsius. What will be the pressure if the temperature is raised to 50 degrees celsius?
The pressure obtained when the temperature is raised to 50 degrees celsius is 135.5 KPa
Data obtained from the questionFrom the question given above, the following data were obtained:
Initial pressure (P₁) = 125 KPaTemperature (T₁) = 25 °C = 25 + 273 = 298 KVolume = 100 mL = Constant Final temperature (T₂) = 50 °C = 50 + 273 = 323 KFinal pressure (P₂) =? How to determine the final pressureThe final pressure can be obtained as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
Since the volume is constant, we have:
P₁ / T₁ = P₂ / T₂
125 / 298 = P₂ / 323
Cross multiply
298 × P₂ = 125 × 323
Divide both side by 298
P₂ = (125 × 323) / 298
P₂ = 135.5 KPa
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Which of the wavenumbers given corresponds to the c=o double bond region on an ir spectrum?
1600 - 1850 cm-1 wavenumber corresponds to the C=O double bond region on an IR spectrum.
Which of the following are wavenumber units in IR spectroscopy?Wavenumbers are the most commonly used units in infrared spectroscopy.IR spectroscopy examines radiation with wavelengths ranging from 40 to 13,000 cm^-1.The stretching frequencies of most alkyne CC bonds range between 2100 and 2200 cm^-1. Terminal alkynes typically produce moderately intense CC stretching signals.IR spectroscopy can be used to determine which functional groups are present in a compound. The IR spectrum is created by recording the frequencies at which a polar bond's vibration frequency is equal to the infrared light's frequency.Infrared spectroscopy (IR spectroscopy) is the study of the electromagnetic spectrum's infrared region, which contains light with a longer wavelength and lower frequency than visible light. It covers a variety of techniques, the majority of which are based on absorption spectroscopy.To learn more about wavenumber of the C=O double bond refer to
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Write a balanced molecular equation for the reaction that occurs when aqueous aluminum nitrate reacts with aqueous sodium sulfide to form aqueous sodium nitrate and an aluminum sulfide precipitate.
The Balanced equation is:
[tex]2Al(NO_3)_3 (aq) + 3Na_2S (aq) \rightarrow Al_2S_3 (s) + 6NaNO_3 (aq)[/tex]
A chemical reaction that has a balanced equation is one in which the total charge and the number of atoms in each of the components, for both the products and the reactants, are exactly equal. Simply said, each side of the reaction process has an equal mass and charge.
A chemically balanced equation is a symbolic representation of a chemical reaction that consists of symbols and formulas, in which a + sign separates the entities in both the reactant and product lists on the left and right, respectively, products and the reactants and an arrow pointing in the direction of the products to indicate the reaction's direction. The critical values of the stoichiometric numbers are shown as coefficients alongside the symbols and formulas of the entities.
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Sample of gas occupies a volume of 64.9 ml. as it expands, it does 124.0 j of work on its surroundings at a constant pressure of 783 torr. what is the final volume of the gas?
The final volume of the gas is 123.9ml.
Given here, the pressure of the gas (P)= 783 torr = 1.03 atm (1atm = 760torr) and work done = 124joules.
The initial volume given here V₁= 64.9ml Or 64.9× 10⁻³l ( 1ml =10⁻³l) .
Now we calculate the final volume by work done formula,
Work done = P(V₂-V₁)
124 = 1.03( V₂- 64.9× 10⁻³)
On calculating this we get,
V₂= 123.9ml or 123× 10⁻³.
So, the final volume calculated and found to be 123.9ml or 123× 10⁻³.
Work done for a gas is defined as the pressure change multiplied by a volume change in the gas.
Thermodynamics is branch which examines a system’s energy and work. This branch of science, thermodynamics examines how heat, work, temperature, and energy are related. The thermodynamics refers to the transfer of energy from one location or form to another. The fundamental idea is that heat is a type of energy that is equivalent to a specific quantity of mechanical labour.
There are three most important laws of thermodynamics, they are zeroth law, first law, second law and third law of thermodynamics which have specific definitions.
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(b) Describe how the arrangement of electrons in a strontium atom is:
(i) similar to the arrangement of electrons in a calcium atom
(ii) different from the arrangement of electrons in a calcium atom.
The electronic configuration of in a strontium atom is similar to the arrangement of electrons in a calcium atom as they have same number of valence electrons, 2.
The electronic configuration of in a strontium atom is different from the arrangement of electrons in a calcium atom as they have different number of electron shell electrons, which is 4 and 5 respectively.
What is electronic configuration of atoms?Electronic configuration of atoms refers to the arrangement of the electrons in an atom in orbits or shells around the nucleus of the atom of the element.
Electronic configuration of atoms of elements forms the basis of the arrangement of the periodic tale into groups and periods.
Elements that have the same number of electrons in their valence or outermost shell are found in the same group and elements that have the same number of electron shells are found in the same period.
Comparing the electronic configuration of calcium and strontium as follows below:
Electronic configuration of calcium is 1s²2s²2p⁶3s²3p⁶4s²
Electronic configuration of strontium is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²
Calcium and strontium have the same number of outermost shell electrons, which is 2. Therefore, they belong to same group.
Calcium and strontium have the different number of electron shell electrons, which is 4 and 5 respectively. Therefore, they belong to different periods.
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the rock's tendency to do this called
a. inertia
b. weight
c. acceleration
Answer:
a. inertia
Explanation:
Inertia means an object will continue its current motion until some force causes its speed or direction to change. The term inertia is properly understood as shorthand for "the principle of inertia" as described by Newton in his first law of motion.
Assume that Element Q has the following three isotopes: 2480, 252Q, and 259Q. If the atomic mass of Q is 258.63, which of its isotopes is most abundant?
Complete the following:
• Make a claim that answers the question
• Support your answer with evidence from the information given
• Explain your reasoning
which compound has the highest magnetic moment
When a boy jumps on his bed, his feet ouch the bed down. What is the reaction force
The bed pushes his feet up
Answer:
The reaction is the weight force of the boy
How are the following aspects of a reaction affected by the addition of a catalyst?.
Any reaction that has a catalyst added to it has its activation energy reduced, accelerating the rate of the reaction. Although it doesn't initiate the reaction, it lowers the energy needed to do so. Furthermore, doing so causes the catalyzed reactions to produce an intermediate product.
The catalyst's properties are the key idea used to address this question. The molecules known as catalysts have a strong tendency to alter the rate of a reaction. It should be noted that the catalyst itself does not change significantly.
A catalyst accelerates both the forward and backward reactions at a faster rate. It also lowers the activation energy for both forward and backward reaction.
Without a catalyst, the reaction would speed up in any direction. However, a catalyst can never increase the rate of a reaction in both directions at the same time—neither forward nor backward. A catalyst lowers the activation energies of both forward and backward reactions, causing them to accelerate in the desired direction.
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A block of wood is measured to be 3.25 cm on each side the density of this particular word is 0.9 45g/7cm3 what is the mass of the sample will the sample float in the water
Mass of the block of wood = 3.25 cm
Density of the block of wood = 0.945 g/ cm³
What happens when an object reaches a state of thermal equilibrium
A fission reaction takes place with a mass defect of 0.0060 kg. how much energy os produces?
5.4 × 10¹⁴ Jules of energy is produced.
Mass defect is the difference between the mass of a composite particle and the sum of the masses of its parts.
The mass defect can be explained using Albert Einstein's formula E = mc².
E is the energy in joules.
m is the mass defect in kilograms.
c is the velocity of light in metres per second (3.00 x 10⁸ m/s).
m = 0.0060 kg
E = 0.0060 kg × (3.00 x 10⁸ m/s)²
E = 5.4 × 10¹⁴ J
Average binding energy per nucleon equals total binding energy divided by mass number (sum of protons and neutrons in an atom).
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PLEASE Name five elements of the Periodic Table and name three properties for each element listed. For example, Oxygen: polarity.
Answer:
Hydrogen = colourless, odourless, extremely flammable
Lithium = lowest density, reacts with water, high specific heat
Oxygen = nonpolar, reactive, tasteless
Helium = low boiling point, low density, low solubility
Nitrogen = odorless, colorless, nonflammable
What is the number of lone pairs on the central atom in the lewis structure of icl2- ?
The central atom of ICl2- has three lone pairs in the Lewis structure.
Clarify the Lewis structure.Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDs), are diagrams that show the covalent bonds that connect atoms in a molecule as well as any lone electron pairs that may be present. Any covalently bonded molecule, as well as coordination compounds, can be given a Lewis structure. Gilbert N. Lewis, who proposed the Lewis structure in his 1916 article The Atom and the Molecule, was named after it. Lewis structures extend the concept of the electron dot diagram by drawing lines between atoms to represent shared pairs in a chemical bond.
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Which of the following choices contain a halogen?
Ca, B, S, Cd
Al, Si, I, Au
Rb, W, Ir, Xe
S, Ar, Pt, P
000
The second option Al, Si, I, Au contain halogen that is Iodine (I).
Fluorine, chlorine, bromine, iodine, and astatine are the five or six chemically related elements that make up the halogens group in the periodic table.Halogens are nonmetals. Fluorine, chlorine, and bromine are all gases at room temperature while bromine is liquid. Both iodine and astatine are solids. Halogens are extremely reactive; from fluorine to astatine, their reactivity decreases.The majority of halogen atoms are lipophilic and less water soluble.Halogens' extreme reactivity is one of its distinguishing characteristics. They can combine to generate a variety of compounds, including halides, interhalogens, and polyhalogenated compounds, as a result of their nature.Water, swimming pools, open wounds, dishes, and surfaces are frequently disinfected with bromine and chlorine.Halogen lamps contain trace amounts of a halogen, such as iodine or bromine.Thus, second option contain halogen.
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A compound of iodine and cesium contains 69.75 g of metal and 65.40 g of nonmetal. how many grams of cesium are in 30.84 g of compound?
The mass of cesium in 30,84 g of compound will be 14.92 g. It can be calculated by the mass of Iodine and Cesium which are combining to form the compound.
Weight of metal which is cesium=65.40g
Weight of non metal which is Iodine= 69.75g
Weight of compound= 135.15g
135.15 g of compound contains 65.40 g of cesium
Therefore,
135.15 g of compound= 65.40 g of cesium
1 g of compound = 65.40/ 135.15 g of cesium
=0.4839g of cesium
30.84 g of compound contains 0.4839× 30.84 g of cesium
=14.92 g of cesium.
So , by using equality and proportion method, weight of cesium will be calculated as 14.92 g.
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Which types of chemical reactions occur faster at equilibrium, the formation of products from reactants or reactants from products?
At equilibrium, the formation of products from reactants or reactants from products occur at the same rate.
Reaction goes in both direction, both reactants and product are present.
The amount of substance of reactants and products of reaction do not change when chemical reaction is in chemical equilibrium.
In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which not change with time.
Speed of direct and irreversible chemical reaction are equal.
For example, balanced chemical reaction in equilibrium:
3H₂ + N₂ ⇄ 2NH₃
Hydrogen (H₂ ) and nitrogen (N₂) are reactants.
Ammonia (NH₃) is product of the reaction.
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Measurements show that unknown compound X has the following composition:
element mass %
carbon 40.9%
hydrogen 4.57%
oxygen 54.4%
Write the empirical chemical formula of X.
The empirical formula of the compound is CHO.
What is the empirical formula?The empirical formula is the formula that shows the ratio of each of the atoms in the compound. Let us now look at the relative percentages of each of the elements and divide them by the relative atomic masses of each of the elements.
C - 40/12, H - 4.57/1, O - 54.4/16
C - 3.33, H- 4.57, O - 3.40
Dividing through by the lowest ratio;
C - 3.33/3.33, H- 4.57/3.33, O - 3.40//3.33
C - 1, H - 1, O - 1
The empirical formula of the compound is CHO.
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what is the average mass of one atom of titanium
Answer:
47.867 U
Explanation:
The average atomic mass of titanium is calculated by taking the weighted average of the atomic masses of its stable isotopes. Simply put, each isotope i will contribute to the average atomic mass of the element in proportion to its decimal abundance, which is simply the percent abundance divided by 100 .
18. Math Connection The density of water is 1.0 g/cm*. How many kilograms of water
does a submerged 120-cm° block displace. Recall that 1.0 kg weighs 9.8 N on
Earth. What is the buoyant force on the block?
The mass of water displaced by the block is 120 g. The buoyant force on the block is the product of its weight and g value that is 1.17 N.
What is buoyant force ?The force that brings an object to float on a fluid is called buoyant force. It is directly proportional to the displaced mass of the fluid by the submerged object.
Given that, density of water = 1 g/cm³
volume of block = 120 cm³
then, displaced mass of water = density of water × volume of block
m = 120 g = 0.12 kg
Buoyant force = mass displaced × g
Fb = 0.12 × 9.8 N = 1.17 N
Therefore, the buoyant force on the block is 1.17 N.
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• evolution
• ecosystems
•
•
light and energy
solar system
Earth (or Earth's atmosphere and oceans)
a science topic that is not listed above
List the science topic you have selected here:
Answer:
I dont really understand what you mean by this but if your asking for us to list subjects than i have a few:
.Biology
.Electricity
.The human body (Anatomy)
. Chemistry
If I need 506.75kg of Al from Al2S3 how many kg of Al2S3 will I need?
The mass of Al₂S₃ in kg required is 2815.28 kg
What is percentage mass of a substance?The percentage mass of a substance is the ratio of the substance in a given substance to that of the total mass of the substance expressed as a percentage.
The percentage mass of aluminum in Al₂S₃ is calculated as follows:
Molar mass of Al = 27 f
Molar mass of Al₂S₃ = 150 g/mol
Percentage mass of Al = 27/150 * 100%
Percentage mass of Al = 18%
Mass of Al₂S₃ required is calculated with the formula:
Mass of Al₂S₃ = mass of Al * 100/percentage mass of Al
Mass of Al₂S₃ = 506.75 * 100/18
Mass of Al₂S₃ = 2815.28 kg
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