Something that is invisible that you can not see.
What are the magic numbers?
The magic numbers are 3, 6, and 9.
How many atoms total are present in one molecule of 5-methyl-2 hexanol C7H16O
Answer:
24 atoms
Explanation:
The formula of the compound is C₇H₁₆O
The number of atoms that makes up one molecule of this compound are:
7 carbon atoms
16 hydrogen atoms
1 oxygen atom
The total number of atoms = 7+16+1 = 24 atoms
Select the star life cycle that is accurate?
A. Star of one stellar mass, red giant, planetary nebula, white dwarf
O
B. Nebula, star of one stellar mass, supernova, black hole
O
C. Supernova, star of three stellar masses, red giant, nebula
O
D. Nebula, white dwarf, red giant, planetary nebula
The star life cycle that is accurate is A. Star of one stellar mass, red giant, planetary nebula, white dwarf.
It should be noted that the life cycle of a star is determined by its mass. The life cycle of a star includes a star of one stellar mass, red giant, planetary nebula, and white dwarf.
It should be noted that a star of one stellar mass is the smallest while the white dwarf is the biggest. The white dwarf is also referred to as the degenerate dwarf and it is very dense and its mass is as being as that of the sun.
In conclusion, the correct option is Star of one stellar mass, red giant, planetary nebula, white dwarf.
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Answer:
A
Explanation:
describe four problems that apollo astronauts faced when they landed on the moon. please answer quickly thanks
Answer:
Explanation:well like greenhouse gases and other gases lets see... for example!the atmosphere is mainly made up of nitrogen and oxygen but contains about 0.04 percent of carbon dioxide! thank you and i hope thats right!!! :D
What does the yellow star in the picture represent
Answer:add the picture and i can tell you
At 400 K and a pressure of 600 mm Hg, a sample of nitrogen gas has a volume of 32.0
ml. What volume does the gas occupy at 200 K and 1.1 atm?
Answer:
1.546 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n is constant, and have different values of P, V, and T:
(P₁V₁T₂) = (P₂V₂T₁)
P₁ = 600.0 mmHg/760 = 0.789 atm, V₁ = 4.31 L, T₁ = 400 K.
P₂= 1.1 atm, V₂ = ??? L, T₂ = 200 K.
∴ V₂ = (P₁V₁T₂)/(P₂T₁) = (0.789 atm)(4.31 L)(200 K)/(1.1 atm)(400 K) = 1.546 L.
What is the molarity of a solution containing 6.0 moles of solute in 549 mL of solution?
a. 11 M
b. 92 M
c. 3.3 M
d. 0.092 M
b because of the solution
The answer is B. Hope that helps!
If 1.2 ·10^-14 moles of magnesium hydroxide, Mg(OH)2, are dissolved in 1.0 L of aqueous solution, what are [OH-] and [H30+]?
Answer:
1. [OH⁻] = 2.4 x 10⁻¹⁴ M.
2. [H₃O⁺] = 4.167 x 10⁻¹ M.
Explanation:
Firstly, we need to calculate the molarity of Mg(OH)₂:
Molarity (M) is the no. of moles of solute that dissolved in 1.0 L of the solution.M = (no. of moles of solute)/(V of the solution (L).
∴ M of MgCl₂ = (no. of moles of solute)/(V of the solution (L) = (1.2 x 10⁻¹⁴ mol)/(1.0 L) = 1.2 x 10⁻¹⁴ M.
1. [OH⁻]:
Mg(OH)₂ is dissociated in the solution according to the equation:Mg(OH)₂ → Mg²⁺ + 2OH⁻.
It is clear that every 1.0 mol of Mg(OH)₂ produces 2.0 moles of (OH⁻).
∴ [OH⁻] = 2(1.2 x 10⁻¹⁴) = 2.4 x 10⁻¹⁴ M.
2. [H₃O⁺]:
∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.
∴ [H₃O⁺] = 10⁻¹⁴/[OH⁻] = 10⁻¹⁴/(2.4 x 10⁻¹⁴ M) = 4.167 x 10⁻¹ M.
Which of the following equations is balanced?
A. Na2SO4(aq) + CaCl2(aq) -> CaSO4(s) + NaCl(aq)
B. Na2SO4(aq) + CaCl2(aq) -> CaSO4(s) + 2NaCl(aq)
C. 2Na2SO4(aq) + CaCl2(aq) -> CaSO4(s) + 2NaCl(aq)
D. Na2SO4(aq) + 2CaCl2(aq) -> CaSO4(s) +NaCl(aq)
answer is B
because both sides have equal numbers of atomos
Classifly the waves as being mechanical or electromagnetic
Answer:
Microwave is Electromagnetic, as is radio wave, ocean is mechanical, s is seismic. A mechanical wave requires an initial energy input. Once this initial energy is added, the wave travels through the medium until all its energy is transferred. In contrast, electromagnetic waves require no medium, but can still travel through one. Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are composed of oscillating magnetic and electric fields.
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Explanation:
Waves are either mechanical or electromagnetic. Mechanical waves require a medium to propagate and can be longitudinal or transverse, like sound waves and waves from a tuning fork. Electromagnetic waves, such as light, do not need a medium and can travel through a vacuum.
To classify waves as either mechanical or electromagnetic, it is essential to understand their fundamental characteristics and how they propagate. Mechanical waves, like the ripples created in water from a stone's impact or the waves coming from a tuning fork, need a medium (like air, water, or solids) to travel through. These waves can be longitudinal, where the disturbance occurs in the same direction as the wave's propagation, or transverse, where the disturbance is perpendicular to the direction of wave propagation.
On the other hand, electromagnetic waves comprise oscillating electric and magnetic fields and can propagate through a vacuum. The classic example of an electromagnetic wave is light, which can travel through empty space and does not require a medium.
Examples of mechanical waves include sound waves and seismic waves, while examples of electromagnetic waves include light waves, radio waves, and X-rays. Maxwell's equations offer further insight into the behavior of electromagnetic waves, predicting their properties and the speed at which they travel.
Potassium has an atomic number of 19 it often forms and ion by losing 1 electron how many electrons would the ion have
Answer: 18
Explanation:
Since there are 19 protons and 19 electrons, by losing one electron, potassium would then have 18 electrons. Hope this helps!
A same of gas in a rigid container is at 25.0Cand 1.00atm. What is the pressure of the sample when heated to 220.0C
Answer:
1.654 atm.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and V are constant, and have different values of P and T:(P₁T₂) = (P₂T₁)
Knowing that:
P₁ = 1.0 atm, T₁ = 25°C + 273 = 298 K,
P₂ = ??? atm, T₂ = 220°C + 273 = 493 K,
Applying in the above equation(P₁T₂) = (P₂T₁)
∴ P₂ = (P₁T₂)/(T₁) = (1.0 atm)(493 K)/(298 K) = 1.654 atm.
An ethylene gas torch requires 3200L of gas at 3.0 atm. What will be the pressure of the gas if the Ethylene is supplied by a 250.0L tank?
Answer:
38.4 atm.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have different values of P and V:(P₁V₁) = (P₂V₂).
P₁ = 3.0 atm, V₁ = 3200 L,
P₂ = ??? atm, V₂ = 250.0 L.
∴ P₂ = (P₁V₁)/(V₂) = (3.0 atm)(3200 L)/(250.0 L) = 38.4 atm.
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A container holds 22.4 L of gas at 1.00 atm and 0.0˚C.
a. Convert 0.0˚C to Kelvin.
b. State the combined gas law.
c. If the pressure increases to 1.50 atm and the temperature doesn’t change,
calculate the new volume.
d. If the temperature increases to 100.0 ˚C and the pressure doesn’t change,
calculate the new volume.
Answer:
Explanation:
Parameter given:
Volume of gas in the container = 22.4L
Pressure on the gas = 1.0atm
Temperature of the gas = 0.0°C
Problem 1
Coverting 0.0°C to Kelvin:
In order to convert 0.0°C to Kelvin, we apply the formula:
K = T(°C) + 273
Where T is the temperature in °C and K is the unknown temperature in Kelvin:
K = 0.0 + 273 = 273K
Problem 2
The combined gas law is also known as the general gas law. It is expressed as:
[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]
The expression combines both Boyle's law and Charle's Law.
Problem 3
Parameters given:
Volume of gas in the container V₁ = 22.4L
Pressure on the gas P₁ = 1.0atm
Temperature = 273K
P₂ = 1.50atm
Unknown: The final volume, V₂ = ?
Solution
From the given problem, we know that the temperature is constant. We apply Boyle's law. Boyle's law states that "The volume of a fixed mass of gas varies inversely a the pressure changes if the temperature is constant".
It is expressed as P₁V₁ = P₂V₂
The unknown parameter is V₂, we make it the subject of the expression:
V₂ =[tex]\frac{P_{1}V_{1} }{P_{2} }[/tex]
V₂ = [tex]\frac{1 x 22.4}{1.5}[/tex]
V₂ = 15L
Problem 4
The unknown here is the new volume V₂ at constant pressure.
Given parameters:
Volume of gas in the container V₁ = 22.4L
Pressure on the gas P is constant
Intial Temperature T₁ = 273K
Final Temperature T₂ = 100°C , converting to K gives, K = 100 + 273 = 373K
From the given parameters, the unknown and the conditions guiding the equation, we apply Charle's law. Charle's law states that "The volume of a fixed mass of gas is directly proportional to its absolute temperature provided pressure is constant".
it is expressed as: [tex]\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }[/tex]
We then express the unknown V₂ as the subject of the formula:
V₂ = [tex]\frac{V_{1} T_{2} }{T_{1} }[/tex]
V₂ = [tex]\frac{22.4 x 373}{273}[/tex]
V₂ = 30.6L
Which of the following careers is most likely to involve preparing tax returns for individuals? A. Accountant B. Chief Financial Officer C. Comptroller D. Risk manager
Answer: Accountant!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Explanation:
Accountant careers is most likely to involve preparing tax returns for individuals
Who is accountant?A individual who practices accounting or accountancy is called an accountant. Accountants may be using titles like "Chartered Accountant," "Chartered Certified Accountant," "Chartered Accountant," or "Registered Public Accountant" after passing certification tests provided by respective professional associations. These experts may be made responsible for professional wrongdoing and are given specific duties by legislation, such as the authority to verify a company's monetary accounts. Non-qualified accountants have no statutory privileges or obligations and are free to operate independently or in the employ of a competent accountant.
Certified Public Accountants (CPAs) and Public Accountants are the two designations for licensed accountants in the United States (PAs). Certified Management Accountants (CMAs) and Certified Internal Auditors (CIAs) are examples of unlicensed accountants (CMAs). Although individuals may get many certificates, the main distinctions between them are their legal standing and the kinds of services they offer. In addition, a lot of accounting work is done by uncertified people who can be working under a certified accountant's supervision. As was already said, the majority of accountants are employed by private companies or are free to provide their services without being certified.
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A balloon that had a volume of 3.50 L at 25.0°C is placed in a hot room at 40.0°C. If the pressure remains constant at 1.00 atm, what is the new volume of the balloon in the hot room?
Answer:
3.676 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and P are constant, and have different values of V and T:(V₁T₂) = (V₂T₁)
Knowing that:
V₁ = 3.5 L, T₁ = 25°C + 273 = 298 K,
V₂ = ??? L, T₂ = 40°C + 273 = 313 K,
Applying in the above equation(V₁T₂) = (V₂T₁)
∴ V₂ = (V₁T₂)/(T₁) = (3.5 L)(313 K)/(298 K) = 3.676 L.
Answer:
3.68 on edge
Explanation:
The diagonals of a rhombus are 6 and 8. The area of the rhombus is 20 24 48
Answer:
= 24 square units
Explanation:
The area of a rhombus is given by the formula;
Area = pq/2
Where p and q are the diagonals of the rhombus.
In this case; p = 6 and q = 8
Therefore;
Area = (6×8)/2
= 24 square units
Answer:
B
Explanation:
Which of these salts is most soluble at 50°C? KNO3 NaNO3 KClO3 NaCl
Answer:
NaNO₃.
Explanation:
From the attached figure, the solubility of the different salts is:KNO₃:It is 90 g per 100 g water.
NaNO₃:It is 110 g per 100 g water.
KClO₃:It is about 20 g per 100 g water.
NaCl:It is about 40 g per 100 g water.
So, the most soluble salt at 50°C is NaNO₃.
The salt most soluble at 50°C is NaNO3 (sodium nitrate).
To determine the most soluble salt at 50°C, we need to consider the solubility data for each salt at this temperature. Generally, the solubility of salts increases with temperature, but the extent of this increase varies depending on the specific salt.
The solubility of these salts at 50°C, in grams per 100 grams of water, is approximately as follows:
- KNO3 (potassium nitrate): about 170 g/100 g H2O
- NaNO3 (sodium nitrate): about 220 g/100 g H2O
- KClO3 (potassium chlorate): about 24 g/100 g H2O
- NaCl (sodium chloride): about 360 g/100 g H2O
From these values, it is clear that NaNO3 has the highest solubility at 50°C, with a solubility of about 220 g/100 g H2O. This is higher than KNO3, KClO3, and even NaCl, which is known for its high solubility in water. Therefore, NaNO3 is the most soluble salt at 50°C among the options provided.
3. Calculate the percent yield of silver chromate if 0.455 grams of silver chromate are produced
from 0.500 grams of silver nitrate.
2 AgNO3 + K2CrO4 -> Ag2 CrO 4 + 2 KNO3
The answer is in the photo.
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?
Molecules in both the metal and the surrounding air will start moving at lower speeds.
Molecules in both the metal and the surrounding air will start moving at higher speeds.
The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow dow
the air molocules that are surrounding the metal will speed up, and the molocules in the metal will slow down, because as the metal cools the molocules will cool which would make them slow down, but then it would heat the surrounding air and make those molocules speed up.
Answer:
D. The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Explanation:
calculate the energy needed to change 12g of ice at -20°C to liquid water at 0°C.
Answer:
504 J.
Explanation:
To solve this problem, we can use the relation:Q = m.c.ΔT,
where, Q is the amount of heat absorbed by ice (Q = ??? J).
m is the mass of the ice (m = 12.0 g).
c is the specific heat of the ice (c of steam = 2.1 J/g.°C).
ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 0.0°C - (-20.0°C) = 20.0°C).
∴ Q = m.c.ΔT = (12.0 g)(2.1 J/g.°C)(20.0°C) = 504 J.
How does the amount of light affect the growth of plants?Do all plant need the same amount of light
Answer:
Light is used by plants in a complex system that uses the light and several other resources to produce food. The more food= the more the plant grows, but too much food can be unhealthy for the plant. Some plants require more energy and others require less, this is because of the environment that they are in.
Explanation:
Plants' growth is significantly impacted by the quantity and quality of light they receive, a process called photomorphogenesis. Not all plants require identical light conditions, which is referred to as photoperiodism. Moreover, the ability of plants to use a variety of light wavelengths for photosynthesis allows them to adapt to different light conditions.
Explanation:The amount of light can significantly impact the growth of plants. Different kinds of lights can foster varying developmental responses in the plants. This is known as Photomorphogenesis, growth and development of plants in response to light. Light influences many functions in a plant beyond photosynthesis, like the timing of flowering, the determination of whether the plant will produce fruit or seeds, and the plant's size.
Also, not all plants require the same amount of light for growth, nodding towards the concept of Photoperiodism. Some plants may flourish best under less-intensive light or might need different types of light to germinate or flower. For instance, fluorescent (cool white) light, high in blue wavelengths, encourages leafy growth. On the other hand, Incandescent lamps promote flowering in some plants due to high richness in red light.
Photosynthetic organisms, like plants, have a mixture of pigments that absorb energy from a wide range of wavelengths. This ability is especially useful for plants growing in competition for light, underwater, or on the rainforest floor because they have limited access to sunlight.
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In a covelant bond two atoms are held together by the attraction between ____. The number of covalent bonds that an atom can form depends on the number ___ in the atom.
A covalent bond is formed by the attraction between the nuclei and the shared pairs of valence electrons between nonmetal atoms, and an atom's ability to form covalent bonds depends on the number of available valence electrons.
In a covalent bond, two atoms are held together by the attraction between the nuclei of a molecule's atoms and pairs of electrons between the atoms. The number of covalent bonds that an atom can form depends on the number of valence electrons in the atom.
Atoms typically form a characteristic number of covalent bonds in compounds. The shared electrons are attracted to the nuclei of both atoms, contributing to the formation of a molecule consisting of two or more atoms. Notably, covalent bonds form only between atoms of nonmetals.
The shared electrons come from the outermost shell of each atom, also known as the valence shell. When the valence electrons are shared, they create a mutual affinity that holds the atoms together, resulting in a covalent bond depicted as C:H or C-H in the simplest case.
What is the definition of a solvent
Answer:
Solvent is the that part of solution which is present in large proportion and have ability to dissolve the solute.
Explanation:
Definition:
Solvent is the that part of solution which is present in large proportion and have ability to dissolve the solute. In simplest form it is something in which other substance get dissolve. The most widely used solvent is water, other examples are toluene, acetone, ethanol, chloroform etc.
Water is called universal solvent because of high polarity all polar substance are dissolve in it. Hydrogen is less electronegative while oxygen is more electronegative and because of difference in electronegativity hydrogen carry the partial positive charge while oxygen carry partial negative charge.
Water create electrostatic interaction with other polar molecules. The negative end of water attract the positive end of polar molecules and positive end of water attract negative end of polar substance and in this way polar substance get dissolve in it.
Example:
when we stir the sodium chloride into water the cation Na⁺ ions are surrounded by the negative end of water i.e oxygen and anion Cl⁻ is surrounded by the positive end of water i.e hydrogen and in this way all salt is get dissolved.
Which influences both chemical weathering and mechanical weathering?
Answer:
wind i think
Explanation:
Answer:
Hello! Your answer is Plants.
What does water pollution cause? Water pollution ------- causing has a prominent harmful effect on aquatic environments.
Answer:
maybe....Oxygen depletion ?
Explanation:
Answer:
Water pollution causing eutrophication has a prominent harmful effect on aquatic environments.
Explanation:
Water pollution causing eutrophication is a prominent harmful effect on aquatic environments. Eutrophication is the excessive presence of chemical nutrients in a water body. This is right.
What is a goal of the planned mission MIRI?
B
A. to land on the moon
B. to explore the Kupier Belt
C. to explore the moon of Jupiter
D. to examine asteroids near Mars
Answer:
The answer is B. to explore the Kupier Belt
Answer:
The correct answer is option B, that is, to explore the Kupier belt.
Explanation:
The MIRI or the Mid-Infrared Instrument possesses both a spectrograph and a camera, which observes light in the mid-infrared region of the electromagnetic spectrum, exhibiting the longer wavelengths that are generally not seen with the naked eyes.
The MIRI encompasses the range of wavelength in between 5 to 28 microns. The sensitive detectors present in them permits to observe the newly developing stars, the redshifted light of far-off galaxies, and faintly visible comets and the objects present in the Kupier belt.
The study of the quantitative relationship between the amount of reactions used and the amounts of products formed by ta chemical reaction is called stoichiometry true or false
The answer is true
Sorry if I'm wrong; please answer my last question I don't have much time; thank you
The statement is true. Stoichiometry is indeed the study of the quantitative relationship between the amounts of reactants used and products formed in a chemical reaction. It utilizes the coefficients from the balanced chemical equation to understand these relationships.
Explanation:The statement is true. The study of the quantitative relationship between the amount of reactants used and the amounts of products formed by a chemical reaction is indeed called stoichiometry. This concept underlies the understanding of the classification of the reaction.
Chemical stoichiometry describes the quantitative relationships between reactants and products in chemical reactions. Coefficients from the balanced chemical equation provide the relative numbers of these chemical species, thus allowing a quantitative assessment of the relationships between the amounts of substances consumed and produced by the reaction.
For example, when calculating the amount of product generated from a given amount of reactant, any other reactants required are assumed to be available in stoichiometric amounts (or greater). These coefficients are used to derive stoichiometric factors that subsequently may be used for computations relating reactant and product masses, molar amounts, and other quantitative properties.
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an acid and a base are mixed and when the pH is ____ the indicator...
a. methyl red turns red
b.alizarin yellow turns red
c.bromocresol green turns blue d.bromothymol blue turns blue
Answer: If the indicator was a universal indicator, when it hits an acid, it'll turn red, when it hits a base, it'll turn blue. Considering you mixed both the acid and the base, it would make the universal indicator turn green. It would then make a "neutral". The answer is C;bromocresol green turns blue
I hope this helps! :D
In which step of a four-stroke engine cycle does the car release CO2, H2O, and CO?
Answer:
[tex]\boxed{\text{exhaust stroke}}[/tex]
Explanation:
The four strokes are
Intake: The mixture of air and fuel enters the cylinder. Compression: The mixture is compressed by a factor of about 11. Ignition: A spark ignites the fuel, which burns and produces CO₂, CO, and H₂O. Exhaust: The combustion products are expelled from the cylinder.[tex]\text{The cylinder releases CO$_{2}$, CO, and H$_{2}$O during the }\boxed{\textbf{exhaust stroke}}[/tex]
Answer:
Exhaust
Explanation:
Mg (s) + HCl (aq) --> MgCl2 (aq) + H2 (g)
Identify the reactants for this reaction
The reactants are Mg (s) +HCl (aq)