check wether all the answers are correct or not. please?​

Circle b represents the solution after 300 mL of solvent has been added.

Volume percent = {Volume of solute / volume of solution} x 100

After adding the solution, the volume of solution increases but volume of solute remains the same. For same volume of solute, the volume percent is high for once which has the volume of solution is low.

In 100 mL the visually represented solution has 12 balls for solute. When 300 mL of solution is added to the solute, the total volume is 400 mL volume is increased 4 times. Then 12/4 = 3 is the number of solute present in the circle. Circle b represents the solution.

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The Tyndall effect can be used to detect whether an unknown sample is a suspension, colloid, or homogeneous solution.

Light can always travel through a solution, and there is never any general light scattering. Between solutions and suspensions, a colloid exists. By diffusing the incoming light, it produces the Tyndall effect. A suspension is hazy and contains visible suspended particles. The suspensions obstruct the passage of light.

A combination that is heterogeneous and has some of its particles settle out as it stands is called a suspension. Therefore, if a beam of light is passed through your sample and it scatters, it is either a suspension or a colloid. It is a solution if it doesn't scatter.

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The best description of tri-glycerols of naturally occurring fats is marked by the presence of abundant saturated fatty acids

The correct option is B more saturated fatty acids is the best description of the triacylglycerols of naturally-occurring fats as compared to oils.

This is because naturally-occurring fats tend to come from animal sources, which typically contain higher amounts of saturated fatty acids, while oils are often derived from plant sources and contain more unsaturated fatty acids. The higher amount of saturated fatty acids in naturally-occurring fats also leads to higher melting points compared to oils.

Shorter carbon chain lengths are typically found in medium-chain triglycerides, which are a type of fat that occurs in smaller amounts in both fats and oils.

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These orbital configurations represent the arrangement of electrons within the different energy levels and subshells of the respective elements.

The orbital configurations of the given elements are as follows:

Helium: 1s² - Helium has two electrons that occupy the 1s orbital.

Nitrogen: 1s² 2s² 2p³ - Nitrogen has two electrons in the 1s orbital, two electrons in the 2s orbital, and three electrons in the 2p orbital (specifically, 2p³ indicates three electrons in the 2p subshell).

Silicon: 1s² 2s² 2p⁶ 3s² 3p² - Silicon has two electrons in the 1s orbital, two electrons in the 2s orbital, six electrons in the 2p orbital, two electrons in the 3s orbital, and two electrons in the 3p orbital (specifically, 3p² indicates two electrons in the 3p subshell).

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The charge on the titanium ion if 0.12A of current passes through the solution for 500 seconds is 8.

The charge of an electrolytic circuit can be calculated using the following formula:

Q = It

Where;

According to this question, 0.12A current was electrolyzed through the solution for 500 second. The charge is calculated thus;

Q = 0.12 × 500

Q = 60C

Using M = QM / Fz

Where:

0.015 = 60 × 189.679 ÷ 96485.332 × z

1447.28z = 11380.74

z = 7.9

z = 8

Therefore, the charge on the titanium ion if 0.12A of current passes through the solution for 500 seconds is 8.

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The potency of acetylcholine after replacing the acetyl group with propionyl or butyrly group decreases.

Its is a organic chemical that function in the brain and body fofmany types of animal ,and humans also as neurotransmitter.

It act as a messenger , that plays a very important role in the central and peripheral nervous system.

The acetylcholine is important for autonomic body functions, muscle control and memory , learning and attention.

Lack of acetycholine cause no contraction in muscles.

Excess of acetylcholine causes cramps , muscular weakness blurry vision, diarrhea etc.

Propionyl or butyryl  is higher homologus group than acetyl , this is the reason the potency will decreases or reduces its activity.

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The ground state configuration of calcium (Ca) is 1s2 2s2 2p6 3s2 3p6 4s2. The ground state configuration is the lowest energy state that an atom or molecule can occupy.

It is the electron configuration of an atom or molecule in its most stable form, corresponding to the minimum energy state. The least energetic and most stable configuration is the ground state configuration. An excited state configuration is a higher energy configuration (it requires energy input to create an excited state). The electrons used for bonding are called valence electrons. The primary quantum number (n), the orbital (s, p, d, or f), and the total number of electrons are used to represent electron configurations. The total number of electrons is expressed as a superscript.

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Answer:

 SO2 and SO3 are acidic oxides that react with bases in aqueous solutions to create sulfurous acid and sulfuric acid salts as these gases dissolve in water. In aqueous solution, SO2 and SO3 react with NaOH to form Na2SO3 and Na2SO4.

Explanation:

The illustration of Thomson's atom represents a neutral atom. In this case, the total amount of positive charge and the total amount of negative charge must be equal. This means that there are equal numbers of protons and electrons in the atom. This is what makes the atom neutral.

A neutral atom is an atom that has no electrical charge. An atom is neutral because it has the same amount of positively charged protons and negatively charged electrons. The nucleus of an atom contains protons, which are positively charged particles. Electrons, which are negatively charged particles, are located in the atom's electron cloud around the nucleus.

Electrons, protons, and neutrons are the three components of atoms. Electrons are negatively charged, protons are positively charged, and neutrons have no charge. Electrons are found outside the nucleus of the atom and are continually moving at high speeds.

In summary, if the illustration of Thomson's atom represents a neutral atom, then the total amount of positive charge and the total amount of negative charge must be equal. This means that there are equal numbers of protons and electrons in the atom. This is what makes the atom neutral.

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Answer:

the products are more stable than the reactants

Explanation:

When comparing spectra from neutral atoms and ionized atoms of the same element, there are significant differences.

The spectrum from a neutral atom shows distinct lines corresponding to the energy levels of the electrons in the atom. On the other hand, the spectrum from an ionized atom shows fewer lines and a more continuous spectrum due to the absence of some of the electrons that would have contributed to the lines in the neutral atom's spectrum.

Additionally, the lines in the ionized atom's spectrum are shifted to higher energy levels due to the loss of electrons and subsequent increase in ionization energy. Overall, comparing the spectra of neutral and ionized atoms can provide valuable information about the atomic structure and properties of the element.

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The concentration of acetic acid in the solution is 0.257 M.

The concentration of acetic acid in the solution is determined from the Henderson- Hasselbalch equation as follows:

where;

pKa = - log(1.7 * 10⁻⁵)

pKa = 4.77

Equation of reaction: HC₂H₃O₂ (aq) + H₂O(l) --> C₂H₃O₂⁻ (aq) + H₃O⁺ (aq)

From the equation of reaction; [A⁻] = [H₃O⁺]

[H₃O⁺] =  antilog -(pH)

[H₃O⁺] = antilog (-2.68)

[H₃O⁺] = 0.002

[A⁻] = 0.002

[HA] = [A⁻] / antilog of (pH - pKa)

[HA] = [A⁻]  / antilog (2.68 - 4.77)

[HA] = 0.002 / 0.00812

[HA] = 0.257 M

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Comets are icy bodies that originate from the outer solar system and are known for their distinctive tails. As they approach the sun, they heat up and release gas and dust that creates a glowing tail that can be visible from Earth.

Celestial objects are objects that exist in space, outside of Earth's atmosphere. They include a wide variety of natural entities, such as stars, planets, moons, asteroids, comets, and galaxies.

Comets and meteors are both celestial objects that can be seen moving through the sky, but they have distinct differences in their characteristics.
Comets are icy bodies that originate from the outer solar system and are known for their distinctive tails. As they approach the sun, they heat up and release gas and dust that creates a glowing tail that can be visible from Earth. Comets also have elliptical orbits and can take years or even centuries to complete a single orbit.
On the other hand, meteors are small particles of dust or rock that burn up upon entering Earth's atmosphere, creating a streak of light in the sky. They are often referred to as shooting stars or falling stars. Unlike comets, meteors do not have a tail and do not originate from the outer solar system. They are typically associated with meteor showers, which occur when Earth passes through a stream of debris left behind by a comet or asteroid.
In summary, while both comets and meteors can be seen moving through the sky, comets are icy bodies with distinctive tails that originate from the outer solar system and have elliptical orbits, while meteors are small particles of dust or rock that burn up upon entering Earth's atmosphere, creating a streak of light in the sky.

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Answer:

false, it is theory of how the universe started

Answer:

it's answer is false you can write it

Answer:

c

Explanation:

I looked the answer up it said it was geosphere

Answer:

the answer is geosphere

Explanation:

i hope it helps you

Answer:

your carbon footprint is how often you use a car of vehical you can decreese it by riding a bike or walking.

Explanation:

Carbon footprint is like when you ride a car and it produces lots of carbon monoxide in the air. Ways to reduce it is by walking, riding a bicycle or using the bus for transportation. Hope this helps.

Explanation:

HNO3(aq) is the compound produced by a neutralization

Answer:

ok dear have a nice day

carry on learing

Answer:

Each names a given number of objects.

Explanation:

Answer:

¿Las partículas de hielo tienen una alta fuerza de atracción entre partículas? Justifica tu respuesta

Explanation:

Dichos contenidos están presentes en los currículos de Física y Química de la educación básica, con independencia del marco legal, pues introducen al alumno en el conocimiento químico de la materia. Aunque la teoría cinética molecular obvia la composición atómica de las partículas, no deja de ser un contenido deseable para introducir a los alumnos en el mundo de la química pues permite diferenciar y establecer relaciones entre los niveles macro, micro y simbólico de la materia.

Answer:

The answer is option C

Explanation:

To calculate the mass of oxygen gas we must first find the number of moles of sulphur

Molar mass = number of moles (n) / mass

n = mass / Molar mass

From the question

Molar mass (M) of Sulphur = 32g/mol

mass = 56g

n( Sulphur) = 56/32 = 1.75mol

Since the moles of oxygen and sulphur are the same

M(O2) = 16 × 2 = 32g/mol

Mass of oxygen = molar mass × moles

= 32 × 1.75

Hope this helps you

Answer

To convert μg/l to mol/kg?

Step 1: from the mass in grams, find the number of moles by diving the mass by its molar mass

Step 2: To go from L to kg, take the volume given multiply it by density in kg/L

a. low melting point: Nonmetals. b. shiny: Metals. c. poor conductor: Nonmetals. d. ductile: Metals. e. malleable: Metals. f. brittle: Nonmetals. g. good conductor: Metals. h. high melting point: Metals

a. Low melting point is generally displayed by nonmetals. Metals tend to have high melting points.

b. Metals are typically shiny due to their ability to reflect light.

c. Nonmetals are generally poor conductors of heat and electricity.

d. Metals are ductile, meaning they can be drawn into thin wires without breaking.

e. Metals are malleable, meaning they can be hammered into thin sheets or shapes without shattering.

f. Nonmetals are usually brittle, meaning they are prone to breaking or shattering when subjected to stress.

g. Metals are good conductors of heat and electricity.

h. Metals typically have high melting points compared to nonmetals.

It's important to note that these are general trends and not absolute characteristics for all metals or nonmetals. Some exceptions or variations may exist within specific elements or compounds.

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The calories needed to raise the temperature of the 300 g aluminium bar are 3.3 kcal or, 3300 cal.

The specific heat capacity is the amount of heat absorbed per unit mass of the substance with a unit increase in temperature. It is useful in calculating the quantity of heat gained or lost by a sample (Q), whose formula is given by:

Q = m*c*ΔT

where, m is the sample mass; c is the specific heat capacity; and ΔT is the temperature change of the sample.

For aluminium,

m = 300 g

c = 0.22 cal/g°C

ΔT = (75-25)°C = 50°C

Therefore, from Q = m*c*ΔT

Q = 300 g * 0.22 cal/g°C * 50°C = 3300 cal = 3.3 kcal

Therefore, 3.3 kcal of energy are needed to achieve a temperature increase of 50°C.

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Marble is not used as a material in decorative fixtures because it is easily corroded by acidic substances. The most common fixture style of drinking fountain and water cooler is wall-mounted.

1. Marble is a naturally occurring stone that is formed from limestone under high pressure and temperature. It is known for its beautiful veining, durability, and strength. Marble is commonly used in construction, such as for flooring, countertops, and statues.

However, marble is not used as a material in decorative fixtures because it is easily corroded by acidic substances, such as vinegar or lemon juice. This can cause the marble to etch, dull, or discolor, which can ruin the beauty of the decorative fixture. Therefore, other materials, such as ceramic, porcelain, or glass, are used instead.

2. Drinking fountains and water coolers are commonly found in public places, such as schools, parks, and offices. They provide a convenient and hygienic way for people to drink water. There are several styles of drinking fountains and water coolers, but the most common style is wall-mounted.

This style is attached to the wall and is usually connected to a water supply and drain. Wall-mounted drinking fountains and water coolers are easy to install, maintain, and clean, making them a popular choice for public areas.

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If you feel that your placement in English, Math, Reading, ESL and/or Chemistry is incorrect, then you should follow the steps below to resolve the issue:

Step 1: Review the Placement Criteria: The first step is to review the placement criteria for the subject. It will help you to understand the reasons behind your placement.

Step 2: Contact the Admissions Office: After reviewing the placement criteria, if you still believe that your placement is not correct, then you should contact the Admissions Office of your college or university. The Admissions Office will provide you with guidance on how to proceed.

Step 3: Submit Additional Documentation: In case you feel that your placement is incorrect, you can submit additional documentation, including test scores or academic records, to the Admissions Office.

Step 4: Appeal the Placement: If you disagree with the placement decision, you can file an appeal. You must provide reasons for the appeal, and it must be filed within a specified timeframe.

Step 5: Take a Placement Test: Finally, if you feel that your placement is not accurate, then you can take a placement test. The test will assess your skills and knowledge and provide you with a placement that is more accurate.

In conclusion, if you believe that your English, Math, Reading, ESL and/or Chemistry placement is incorrect, then you should follow the steps mentioned above. It is essential to take the necessary steps to ensure that you are placed in the correct level. The correct placement will help you to succeed in your academic journey.

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When it comes to chemical formulas, the chemical formula is used to show the elements that make up a compound. For instance, water has the chemical formula H2O, which shows that it is made up of two hydrogen atoms and one oxygen atom.

Hydrogen ion (H+) has the chemical formula H+

Hydroxide ion (OH-) has the chemical formula OH-

Hydronium ion (H3O+) has the chemical formula H3O+.

The chemical formulas of hydrogen ion, hydroxide ion, and hydronium ion are:

H+ for hydrogen ion OH- for hydroxide ionH3O+ for hydronium ion.

An ion is an atom or a molecule that has gained or lost electrons. These atoms or molecules become charged ions due to their gain or loss of electrons. Hydrogen ion, hydroxide ion, and hydronium ion are three of the most common ions in aqueous solution that have a significant impact on chemical reactions. The hydrogen ion, which has a positive charge, is an essential component of many chemical reactions, particularly those that take place in water. It is represented by the chemical symbol H+. The hydroxide ion, which has a negative charge, is also a crucial component of many chemical reactions, particularly those that take place in water. It is represented by the chemical symbol OH-.The hydronium ion, which has a positive charge, is another important component of many chemical reactions, particularly those that take place in aqueous solutions. It is represented by the chemical symbol H3O+.

In summary, hydrogen ion, hydroxide ion, and hydronium ion are important components of many chemical reactions. They have different chemical formulas, with hydrogen ion being represented by H+, hydroxide ion by OH-, and hydronium ion by H3O+.

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As a teacher, I can definitely understand why someone like Darling-Hammond (2006) perceives teaching as more complex than law, medicine, or engineering. There are a few different reasons for this. First and foremost, teaching involves not just imparting knowledge to students, but also building relationships with them, understanding their individual needs and learning styles, and creating a positive and supportive classroom environment. This requires a high level of emotional intelligence, as well as the ability to adapt and be flexible in the face of different challenges and situations.

Additionally, teaching is a constantly evolving field, with new research and best practices emerging all the time. Teachers need to stay up-to-date on the latest trends and techniques in their subject areas, as well as on educational technology and other tools that can enhance learning. They also need to be skilled at assessment and evaluation, both of their student's progress and of their own teaching effectiveness.

Finally, teaching is a highly demanding and time-consuming profession, with long hours both inside and outside of the classroom. Teachers often need to juggle multiple responsibilities, from planning and grading to meetings and professional development, while still finding time to connect with their students and families. All of these factors combine to make teaching a uniquely complex and challenging field, one that requires a combination of intellectual, emotional, and practical skills to succeed.

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Answer:

X : 68 F

Y : 72 F

Explanation:

pls mark brainliest

Answer:

16. false (mass always stays the same)

17. false (that's weight)

18. true

19. true (I think)

20. false (same as 16 and 17)

hope I could help

True and false for each statement is:

16. false

17. false

18. true

19. true

20. false

Mass is the quantity of matter. It calculates the inertia of the body. It essentially refers to a body of matter's resistance to changing its speed or location in response to the application of a force. The change caused by an applied force is smaller the more mass a body has.

The mass of a body is the same everywhere, but the weight changes in different places due to gravity. The force of gravity is different in different places, so the weight changes.

That's, why the mass measurement does not include the effect of Earth's gravitational pull on the object. It's the weight.

Thus, the correct options are 16. false, 17. false, 18. true, 19. true, and 20. false.

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