WILL GIVE BRAINLIEST Pam and Caroline determined the mass and volume of a piece of metal to be 34.16 g and 11.3 mL respectively. Determine the density of the metal. (Please show work and use significant figures.

The charge of the bromide ion is -1, which can be represented as Br-.

The bromide ion is a monatomic anion with the chemical symbol Br-. It has a single negative charge and a stable electron configuration equivalent to that of krypton. The bromide ion is formed when a neutral bromine atom acquires an additional electron to achieve the stable octet electronic configuration. Hence, the charge of the bromide ion is -1, which is represented by a minus sign.

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The solid commonly used as an inactive electrode in electrochemical cells is Graphite. So option b is the correct answer.

Graphite is often chosen as an electrode material because it is chemically inert, highly conductive, and has a stable structure. This makes it suitable for various electrochemical applications without affecting the overall cell reactions.

An inactive electrode, also known as an inert electrode, is an electrode that does not participate in the chemical reaction occurring in the cell but serves as a conductor for the flow of electrons.

The graphite working electrode, which can be employed as an anode or a cathode in various electrochemical applications, is renowned for its chemical stability, superior electrical conductivity, and high melting point.

So the correct answer is option b. Graphite.

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Theoretical mass (O₂)= H₂O₂ Volume×  H₂O₂ density× {( 1 mol O₂)/(2 mol H2O2)}×{( mol of  H₂O₂ /g  H₂O₂ )}

H2O2 Volume= 5 ml

Known density( H₂O₂ )= 1.02 g/ml

Molar mass ( H₂O₂ )= 34.01 g/mol

Reciprocal molar mass(  H₂O₂ )= 0.0294

Theoretical mass( O₂)= 5×1.02× 0.0294× 1/2= 0.0749 moles

Actual moles of O₂ and percentage of  H₂O₂

P= 753 mm Hg×1 atm/760 mm Hg= 0.991 atm

V= 45  ml× 1L /1000 ml= 0.045 L

n= PV/RT

Actual moles ( O₂)= (0.991×0.045)/(0.0821×296 K)= 0.0445/24.3016= 1.8×10^-3 moles

Percentage ( H₂O₂ )= Theoretical moles(O₂)×100= 0.0749×100= 7.49%

Mass of  H₂O₂ (percent)= 3%

Concentration by mass( H₂O₂ )= 3 gm H2O in 100 ml of H2O

Volume ( H₂O₂ )= 100 ml

1 mol ( H₂O₂ )= 34.02 g O2

(3g  H₂O₂ /100 ml Solution)×( 1 mol  H₂O₂ /34.02 g H2O2)

No. Of moles ( H₂O₂ )= 0.088 moles

Mass ( H₂O₂ )= 0.088 moles × 34.02 = 2.99 g

%  H₂O₂ = (2.99 g  H₂O₂ /100 ml Solution)×100= 2.99%

% error= (%  H₂O₂ from the bottle-experiment %  H₂O₂ )/(% H₂O₂ from bottle)×100

=[ (3-2.99)/(3) ]× 100= 0.34% error.

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The element named for Time magazine's "Person of the Century" is Einsteinium which was named in recognition of Einstein's significant contributions to the field of physics.

Time magazine declared Albert Einstein as the "Person of the Century" in 1999. As a tribute to his contributions to physics and his role in shaping our understanding of the universe, the element with atomic number 99 was named Einsteinium (symbol: Es) in his honor.

Einsteinium is a synthetic element that was first synthesized in 1952 during the testing of a thermonuclear bomb. It is highly radioactive and has no practical applications outside of scientific research.

The element named for Time magazine's "Person of the Century," Albert Einstein, is Einsteinium (Es). This element, with atomic number 99, was named in recognition of Einstein's significant contributions to the field of physics and his enduring legacy as one of the greatest scientific minds in history.

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Answer:

The answer is D sodium

Explanation:

Answer:

5.77x10^-7 m or 577 nm (nanometers)

Explanation:

The wavelength, λ, and frequency, ν, of light are described by the equation:

c = λν

where c is the speed of light.  

c = 3.0x10^8 m/s

v = 5.2x10^14

λ = c/v

λ = (3.0x10^8 m/s)/(5.2x10^14) = 5.77x10^-7 m

since 1 m = 10^9nm, we can express this as 577 nm (nanometers)

577 nm.  This is in the yellow light span of wavelengths.

A calcium hydroxide aqueous solution is used in the carbon dioxide test (lime water). Limewater turns milky whenever carbon dioxide is bubbling within it or agitated with that as well (cloudy).

Drinking lime water improves digestion. The acidity of lime juice helps saliva break down meals for easier digestion. Lime juice is good astringency can ease constipation by encouraging digestion and cleansing the digestive tract.

What results in milky lime water?

Limewater appears milky because the sodium bicarbonate that is created is white and insoluble in water. Lime water is known chemically as calcium carbonate, but also its concentration is Ca(OH)2. Pure limewater usually translucent, colorless, with a slightly bitter taste. Also, it smells little earthy.

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Answer:

A. Oil is to heavy to mix with water

HOPE THIS HELPS

-Todo <3

Explanation:

Answer:

It should be C - Water can only mix with polar molecules.

Explanation:

Oil is non-polar and water is polar.

The statement that best defends Jada's conclusion is:

I. Gases are always produced when the substances undergo the chemical change.

When substances undergo a chemical change, their atoms are rearranged into new compounds with different properties. In some cases, the chemical reaction can produce a gas as one of the products. This gas may escape into the surrounding environment and cannot be accounted for in the measurement of the final mass of the mixture.

Statements F and G are both related to the conservation laws of mass and energy, respectively, and while important in chemistry, they do not directly address the observation of gas production in this experiment.

Statement H is incorrect because solids can undergo physical changes, such as melting or evaporating, without being destroyed.

Therefore, statement I is the most appropriate explanation for the observation made by Jada, and it best defends her conclusion that a gas was produced and escaped into the air during the chemical reaction between baking soda and vinegar.

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Answer:

False

Explanation:

Triple covalent bonds are much more stronger than single covalent bonds. In single bond, 2 electrons are shared, in double bond four electrons are shared and in triple bond six electrons are shared. Thus, triple bond is difficult to break since it is the strongest bond. Between the two atoms, stronger the bond, more stable the molecule. Thus, triple bond is more stable.

1. The longer distance for each choice is:

2. The complete statements are as follows;

3. The basic unit of length in the metric system is the meter and is represented by a lowercase m.

4. The meter is defined as the distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second.

5. The values that complete each statement is given below:

6. The larger value for each option is:

7. The number of millimeters in 1 centimeter is 10 mm

8. Using the ruler and line, the answers are:

The unit for measuring distance in the metric system is the meter. Smaller and larger values of the meter are also used such as millimeters, centimeters, kilometers, etc.

Other units for measuring distance include yards, miles, and inches.

The various units for measuring distance can also be interconverted using their conversion factors.

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Answer:

Star is a cycles two

Sana maka tolong

The main component in a cement slab in a house is typically Portland cement.

Key points:

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Answer:

spandex and cotton is a natural mix for sporta clothing and undergarments to improve stretching properties and prevent odour

Explanation:

B. Recycles slowly

And it also depends on the organism

The volume of CO₂ gas produced is 34.8 liters.

The chemical reaction stating decomposition of CaCO₃ is -

CaCO₃ → CaO + CO₂

In the above reaction, CaCO₃ is calclium carbonate, CaO represents calcium oxide and CO₂ is the chemical formula of carbon dioxide.

In the reaction, 1 mole of CaCO₃ forms 1 mole of CO₂. So, number of moles of CaCO₃ consumed will be equal to number of moles of CO₂ produced.

Molar mass of CaCO₃ = 100.1 grams/mole

Number of moles = \(\frac{45}{100.1}\)

Number of moles = 0.44955 moles

Now, using ideal gas equation to find the volume of CO₂ produced at STP.

PV = nRT, where P is pressure in atm, V is volume in liters, n is number of moles, R is gas constant and T is temperature in Kelvin.

Taking R =  0.0821 L-atm per mol-K

Also, 1 torr = 0.00132 atm

So, 645 torr = 0.00132*645

645 torr = 0.8487 atm

Keep the values in formula to find Volume.

\(V = \frac{0.44955*0.0821*800}{0.8487}\)

V = 34.8 liters

Hence, the volume of CO₂ gas produced is 34.8 liters

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To find the new volume of nitrogen, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature. The formula for Boyle's Law is: P1V1 = P2V2

Where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume. Given:
Initial pressure (P1) = 748 mmHg
Initial volume (V1) = 34.7 L
Final pressure (P2) = 725 mmHg
Final volume (V2) = ?

Using the formula, we can solve for V2:
P1V1 = P2V2
748 mmHg * 34.7 L = 725 mmHg * V2
V2 = (748 mmHg * 34.7 L) / 725 mmHg
V2 = 35.9 L (rounded to one decimal place)
Therefore, the new volume of nitrogen is approximately 35.9 L.

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Answer:

A

Explanation:

Answer:a

Explanation:

Answer:

A person sings into a microphone.

Sound is converted to an electrical signal

The electric signal creates a magnetic code.

A magnetic code is transferred to a medium such as a tape or ...

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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The process that is not involved in contributing to acid deposition is option C: 2NO(g) + O2(g) → 2NO2(g). This is because it does not involve the formation of any acid, unlike the other options which all result in the production of nitric acid (HNO3) or nitrous acid (HNO2) when combined with water.

Nitrogen monoxide (NO) is a precursor to the formation of nitrogen dioxide (NO2), which is the main contributor to acid deposition. NO2 reacts with water in the atmosphere to form nitric acid (HNO3) or nitrous acid (HNO2) depending on the conditions. Therefore, emissions from jet or automobile engines that contain NO contribute to acid deposition by reacting with other compounds in the atmosphere to form acid rain. It is important to control emissions of nitrogen oxides to reduce the impact of acid deposition on the environment.

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Specialized periodicals in which scientists publish the results of their works are called scientific journals.

In educational publishing, a scientific journal is a periodical book intended to similarly the progress of technology, typically by way of reporting new studies.

Journal articles may include original research, re-analyses of studies, opinions of literature in a selected place, proposals of new but untested theories, or opinion pieces.

These scientific journals include the following.

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Answer: Wind energy, mechanical energy, electrical energy, and thermal energy.

Explanation:

In this example, the following forms of energy are occurring in order of first to last:

So, the forms of energy occurring in this example are wind energy, mechanical energy, electrical energy, and thermal energy.

potassium-42 has a half-life of 12.4 hours. approximately how much of an 1202 mg sample of potassium-42 will be left after 2 days is 1522 mg.

a potassium isotope with a half-life of 12.36 hours that is synthesised artificially and is employed as a radioactive tracer in research on how much potassium is distributed in physiological fluids.

The time needed for a reactant's concentration to drop to half its initial value is a different method of describing reaction rates. The reaction's half-life, denoted by the symbol t1/2, is the duration of this time. Therefore, the reactant concentration must fall from [A]0 to [A]0/2 over the course of a reaction's half-life. The quicker reaction will have a shorter half-life if two reactions have the same order, while the slower reaction will have a longer half-life.

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The increase in the diversity of species in an ecosystem  definitely lead to an increase in the productivity from that ecosystem. Hence, the statement is true.

An ecosystem is the regions in earth where  a group of living things and their essential non living things reside. There are various kind of ecosystems such as aquatic systems, forests, deserts etc.

The biodiversity refers to the diverse species of plants , animals and all other kind of livings there. By raising the possibility that species would use complementary resources and by increasing the likelihood that a highly productive or efficient species is present in the population, increasing species diversity can impact ecosystem functions, such as production.

For instance, greater use of soil resources can boost ecosystem production when there is a large diversity of plants. Similarly, when diverse plants populate more dependent animal variants survives more.

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Answer:

A. True

Explanation:

Got it right on Edge 2023.

Less evaporation means that less of the sun's energy is used to convert water into water vapor, and more of it is used to heat up the surface. In urban areas, there is typically less vegetation and more impervious surfaces (such as concrete and asphalt), which reduces the amount of water that can evaporate.

This means that more of the sun's energy is absorbed by the surface, leading to higher temperatures. Additionally, buildings and other structures in urban areas can trap heat and prevent it from dissipating, further contributing to the urban heat island effect.

In rural areas, vegetation and soil moisture play an important role in regulating temperature through a process called evapotranspiration. Evapotranspiration is the combined process of water evaporation from the soil and plant transpiration. It helps to cool the air by removing heat from the surface through the transfer of water from the surface to the atmosphere.

In contrast, urban areas have a significant amount of impervious surfaces like concrete, asphalt, and buildings, which reduce the amount of vegetation and soil moisture. As a result, urban areas have less evapotranspiration, which means less cooling effect from the evaporation of water. This leads to a higher surface temperature in urban areas.

Furthermore, urban areas have a higher proportion of dark-colored surfaces, such as asphalt and concrete, which absorb more solar radiation than lighter-colored surfaces like vegetation and soil. This is known as the "urban heat island effect," which further contributes to higher temperatures in urban areas.

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Hydration refers to the process by which water molecules surround with  ions, in a solution.

The properties of water enable its molecules to interact with ions in solution are polar nature, solvent ability and high dielectric constant.

Hydration refers to the process by which water molecules surround and interact with solute particles, typically ions, in a solution. Water's unique properties enable it to effectively interact with ions and facilitate their dissolution and dispersion in solution.

The properties of water that enable its interactions with ions in solution are:

1. Polarity: Water is a polar molecule, meaning it has a partial positive charge (δ+) on the hydrogen atoms and a partial negative charge (δ-) on the oxygen atom. This polarity arises due to the unequal sharing of electrons between oxygen and hydrogen atoms in the water molecule. The positive and negative charges in water allow it to form hydrogen bonds with other water molecules and with ions in solution.

2. Solvent ability: Water is often referred to as the "universal solvent" because of its excellent ability to dissolve a wide variety of solutes. This property is attributed to the polarity of water. When an ionic compound is added to water, the positive end of the water molecule (δ+) is attracted to the negatively charged ion, while the negative end of the water molecule (δ-) is attracted to the positively charged ion. These attractive forces weaken the ionic bonds holding the ions together and surround the ions with a hydration shell, effectively dissolving them in water.

3. Ion-dipole interactions: Water can form ion-dipole interactions with ions in solution. These interactions occur when the charged ions are attracted to the oppositely charged ends of the water molecule. The positive ion is attracted to the oxygen atom (δ-) of water, while the negative ion is attracted to the hydrogen atoms (δ+) of water. These ion-dipole interactions help stabilize the ions in solution and prevent them from recombining.

4. High dielectric constant: Water has a high dielectric constant, which is a measure of its ability to reduce the electrostatic forces between charged particles. The high dielectric constant of water allows it to effectively shield the attractive and repulsive forces between ions, preventing them from rapidly coming together and precipitating out of solution.

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Answer:

Describes its potential to undergo some chemical change or reaction by virtue of its composition

Answer: 0.25 atm

Explanation: