A sample of metal has a mass of 20.27 g, and a volume of 4.89mL. What is the density of this metal​

Answer:

-2, -2 and 0.

- Respiration is a process in which energy is produced and photosynthesis is a process in which energy is used.

Explanation:

Hello,

In this case, oxygen is a substance that is used for animals and us to acquire the energy necessary for several functions by the cellular respiration (we also need glucose), besides, it is a product of the photosynthesis carried out by vegetable cells (plants). Moreover, carbon dioxide and water are used by the plants to produce oxygen we need as well as glucose via the aforementioned photosynthesis, thus, both chemical reactions are shown below:

\(C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O\ \ \ respiration\\\\6CO_2+6H_2O\rightarrow C_6H_{12}O_6+6O_2\ \ \ photosynthesis\)

In such a way, since the oxygen in carbon dioxide and water has an oxidation state of -2 (reduced form) we can say that the respiration is a process in which energy is produced and since the oxygen yielded during the photosynthesis has an oxydation state of 0, we can say that photosynthesis is a process in which energy is used.

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The primary distinction between these two negotiation strategies is that distributive negotiation does not take into consideration the demands of the other party when negotiating a settlement.

In a competitive negotiation style known as distributive bargaining, one party only gains when the other party loses.

Positional negotiating involves both sides criticising one other's proposals in an effort to convince the other that theirs is the best. By engaging in interest-based negotiation, both (or all) sides approach the problem and search for a solution that best advances their individual interests.

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The temperature at the beginning and the end of a change of state correct option is : The temperature is usually the same.

The correct option is: The temperature is usually the same.

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The temperature at the beginning of a change is always lower than the temperature at the end of the change option A

The temperature doesn't vary during a phase transition, such as melting or boiling, until the phase change is finished. This is so that intermolecular forces can be broken rather than the average kinetic energy of the particles, which is related to temperature, being increased by the heat energy being applied to the substance.

But the temperature does increase from one point to the other on the heating curve.

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To solve this problem using the gas laws, we need to use the Ideal Gas Law. This law states that the product of the pressure and the volume of a gas is proportional to the absolute temperature.

The equation of the Ideal Gas Law is the following:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{\dfrac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2} } \end{gathered}$} }\)

Where:

We clear for V₂:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{P_1V_1T_2}{P_2T_1 } } \end{gathered}$} }\)

Where:

Substituting the known values:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{760\not{kPa}\times0.050 \ L\times20.0\not{k} }{ 380\not{kPa}\times10.0\not{k} } } \end{gathered}$} }\)

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{760 \ L}{3800 } } \end{gathered}$} }\)

\(\boxed{\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2\approx0.2 \ Liters} \end{gathered}$} }}\)

Answer:

D

Explanation:

The pineal gland regulates salt and water levels.

The pineal gland does not regulate salt and water levels. Therefore, option (D) is correct.

The pineal gland can be described as a pinecone-shaped small gland located in the middle of the human brain. The pineal gland is the main site for melatonin secretion, which regulates the internal clock of the body.

The dimensions of the pineal gland can be described as about 0.3 inches long and weighing 0.1 grams. The pineal gland is made of pinealocytes and supporting cells that are similar to the astrocytes in the brain.

The pineal gland secretes the hormone melatonin and this hormone regulates the circadian rhythm of the body and also reproductive hormones. The secretion of hormones depends upon the quantity of light a person is exposed to.

This hormone is formed in huge amounts when it is dark. The presence of light prevents the secretion of melatonin which controls circadian rhythms.

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Answer:

I think it's A or D im not sure which one..

Answer:

C.) Electrons

Explanation:

Niels Bohr's 1913 model depicts that the atom has a small, positively charged nucleus which surrounded by electrons that travel in circular orbits around the nucleus.

The Bohr model, is a representation of the structure of atoms, especially that of hydrogen, The Bohr Model is a universal model in which the negatively charged electrons orbit a small, positively charged nucleus like the planets.

In the Bohr model, electrons are pictured as traveling in circles at dissimilar shells, depending on which element you have. The Bohr model is a proportional primitive model of the hydrogen atom, in contrast to the valence shell mode

So we can conclude that the Bohr Model is a structural model of an atom that shows electrons and the nucleus of an atom.

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Explanation:

45.8 grams of Fe2O3*(1 mole/159.69 g)= moles of Fe2O3

moles of Fe2O3 *(3 moles of O2/2 moles of Fe2O3)=moles of O2

moles of O2*(32.0g of O2/1mole)= mass of O2

The vapor pressure of the SiCl₄ in the mmHg at the 33.0 °C is the 312 mmHg.

The Clausius - Clapeyron equation is as :

ln ( P₂ / P₁ ) = ΔHvap / R ( 1 / T₁ - 1 / T₂ )

P₂ = P₁eˣ

Where,

The temperature, T₁  = 5.4 °C = 278.55 K

The temperature, T₂  = 33.0 °C= 306 K

The pressure, P₁ = 100 mmHg

ΔHvap is the heat of the vaporization = 30.2 kJ /mol = 30200 J/mol

The gas constant, R = 8.314 J / mol K

x = ΔHvap / R ( 1 / T₁ - 1 / T₂ )

x = 30200 / 8.314 ( 1/ 278.55 - 1/ 306 )

x = 1.05

P₂ = 100 \(e^{1.05}\)

P₂ = 312 mmHg

The vapor pressure of the  SiCl₄ is 312 mmHg.

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Magnesium is not a good conductor. Hence, the conductivity of magnesium is not good.

Magnesium is placed in group 2 of the periodic table. It has 2 valence electrons which are in the fully filled s-subshell. When the subshell is fully filled, the electrons are not available to move to conduct. For example, group 1 has half filled subshell which allows the electrons to move.

But, how does magnesium conduct? As its subshell is fully filled and therefore no electrons are available to move.

In group 2 metals, there is a property called s-p hybridization. The s- and p- subshells overlap so that metals can now move to the unfilled states of the p-subshell.

Hence, magnesium is not a good conductor.

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Answer:

The combustion of hexane (C6H14) is represented in the balanced equation : 2 C6H14 + 19 O --- 12 CO2 + 14 H2O MM hexane 86.18 g/mole, O2 32 g/mole, CO2 44 g/ mole, H2O 18 g/mole A. If 45 g of hexane is reacted and 45 g of water is recovered.

Explanation:

The products of this reaction is 2C₆H₁₄ + 19O₂ = 12CO₂ + 14H₂O is carbon dioxide and water.

Combustion is  the process where a substance burns in the presence of oxygen, giving off heat and light in the process. The hydrocarbons burn in the presence of oxygen giving carbon dioxide and water along with release of energy and thus the process is exothermic.

Combustion is a high-temperature exothermic (heat releasing) redox (oxygen adding) chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.

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Answer:

3

Explanation:

the three elements involved in this compound are Li, S, O.

lithium, sulfur, and oxygen. Which create the ionic compound, "Lithium Sulfate."

7 atoms total, since there are two lithium, four oxygen, and one sulfate atom. this is a white inorganic salt.

There are three different types of elements in LiSO₄ which are lithium (Li), sulfur (S), and oxygen (O).

An element is a pure substance made of only one kind of atom which all have the same number of protons in their nuclei.

The chemical element was first presented by Robert Boyle who defined it as "incapable of decomposition”. Boyle’s this definition lies admirably close to present-day theory.

When different kinds of elements undergo particular chemical reactions then atoms are rearranged into new compounds connected together by chemical bonds.

All other naturally occurring elements occur on the Earth as compounds or mixtures. Air is a mixture of the elements nitrogen (N₂), oxygen (O), and argon (Ar), though it does contain carbon dioxide and water.

Given compound, lithium sulfate is formed of LiSO₄ has elements lithium, sulfur, and oxygen.

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If during a spectroscopy experiment a student notes a wavelength peak measurement at 280 nm, then the region of the electromagnetic spectrum observed is the UV region.

The electromagnetic spectrum refers to all types of wavelengths that radiation can emit as light, which involves both visible light and also ultraviolet (UV) radiation.

In conclusion, if during a spectroscopy experiment a student notes a wavelength peak measurement at 280 nm, the region of the electromagnetic spectrum observed is the UV region.

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Answer: 0.656168 Feet per minute

Explanation:



0.656168 feet per minute

The formula is:

for an approximate result, divide the speed value by 1829

Answer:

One difference between Group 7 of the modern periodic table and Group 7 in Mendeleev's periodic table is the placement of the elements.

In Mendeleev's periodic table, Group 7 consisted of manganese (Mn), technetium (Tc), and rhenium (Re). In the modern periodic table, Group 7 consists of the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

The halogens are a group of highly reactive nonmetals, while the elements in Group 7 of Mendeleev's periodic table were not all nonmetals and did not share the same chemical properties as the halogens.

Hope this helps!

Answer:

Mass percent: 53.23%

Explanation:

Balancing the reaction in acidic medium:

Fe2+ → Fe3+ + 1e-

Cr₂O₇²⁻  → 2Cr³⁺

Cr₂O₇²⁻ → 2Cr³⁺ + 7H₂O  (Balancing oxygen)

Cr₂O₇²⁻  + 14H⁺ → 2Cr³⁺ + 7H₂O (Balancing protons)

Cr₂O₇²⁻  + 14H⁺ + 6e-→ 2Cr³⁺ + 7H₂O (Balancing charges)

To cancel the 6e-:

6 Fe2+ → 6 Fe3+ + 6e-

The balanced redox equation in acidic medium is:

6Fe²⁺ + Cr₂O₇²⁻ + 14H⁺ → 6Fe³⁺ + 2Cr³⁺ + 7H₂O

We need to find moles of potassium dichromate used to reach the final point in the titration. Then, using the chemical equation, we can find moles of Fe²⁺. With its molar mass (Molar mass Fe: 55.85g/mol)b we can find mass of Fe²⁺ in the iton ore and its mass percent:

Moles potassium dichromate:

28.72mL = 0.02872L * (0.05051mol / L) = 1.4506x10⁻³ moles K₂Cr₂O₇

Moles Fe²⁺:

As 6 moles of Fe²⁺ reacted per mole of K₂Cr₂O₇:

1.4506x10⁻³ moles K₂Cr₂O₇ * (6 moles Fe²⁺ / 1 mole K₂Cr₂O₇) = 8.7039x10⁻³ moles Fe²⁺

Mass Fe²⁺:

8.7039x10⁻³ moles Fe²⁺ * (55.845g / mol) = 0.4861g of Fe²⁺

Mass percent:

As the sample of iron ore weighs 0.9132g. Mass percent is:

0.4861g of Fe²⁺ / 0.9132g * 100

The mass percentage of the iron in the sample is 53.7%.

The balanced redox reaction equation is;

6Fe2+(aq) + Cr2O7^2-(aq) + 14H^+(aq)→ 6Fe3+(aq) + 2Cr3+(aq) + 7H2O(l)

The number of moles of dicromate ion is; 28.72/1000 L × 0.05051M

= 0.00145 moles

Now;

6 moles of Fe2+ reacts with 1 mole of dichromate ion

x moles of  Fe2+ reacts with 0.00145 moles of dichromate ion

x = 6 moles × 0.00145 moles/1 mole

x = 0.0087 moles

Mass of iron = 0.0087 moles × 56 = 0.49 g

Mass percent of iron = 0.49 g/0.9132 g × 100/1

= 53.7%

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The number of atoms :

C = 6 x 5 x 10²¹ = 3 x 10²²

H = 12 x 5 x 10²¹ = 6 x 10²²

O =  6 x 5 x 10²¹ = 3 x 10²²

Given

1.5 g glucose(C₆H₁₂O₆)

Required

The number of atoms

Solution

mol of glucose(MW=6.12+12.1+6.16=180 g/mol) :

mol = mass : MW

mol = 1.5 : 180

mol = 0.0083

Number of molecules = 0.0083 x 6.02 x 10²³ = 5 x 10²¹

There are 6 C, 12 H and 6 O, so number or atoms :

C = 6 x 5 x 10²¹ = 3 x 10²²

H = 12 x 5 x 10²¹ = 6 x 10²²

O =  6 x 5 x 10²¹ = 3 x 10²²

A 52gram sample of water that has an initial temperature of 10C absorbs 4130 joules. If the specific heat of water is 4.184 j.  25°C is the final temperature of the water.

The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using several temperature scales, which traditionally drew on different reference locations.

The most popular scales include the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the scale of Fahrenheit (°F), or the Kelvin scale (K), with the latter being mostly used for scientific purposes.

q = m×c×ΔT

4130 = 52×4.184×(T2- 10C)

T2= 25°C  

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Answer:

Campher freezes are in winter

Answer:

Explanation:

c) fusion combines into one product plus energy

Answer:

It decreases........ 2.65 atm

Explanation:

2021 edg

Answer:

B: A set of steps that help scientists gather knowledge.

Explanation:

It's a series of steps that starts with an observation and ends with a Report/conclusion. The others don't make sense.

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Answer: 0.052moles

Explanation:

number of moles = given mass (g) / molar mass(g/mol)

n=m/M

n= 5.2g/ (40 + 12 + 48)g/mole

n=5.2g/100g/mol

n=0.052 moles

Answer:

Explanation:

Here, we want to write the rate law for the stated reaction

We have this as:

The wavelength of lambda is 2.93 m. = (c)/(v) = (3 xx 10(8) ms-(-1), 102.5 xx 10(6)s-(-1), 2.93 m' 2.93 meters is the wave length. 27 Jun 2022.

In order to get a radio wave's wavelength, divide its frequency by the speed of light (c = 299 792 458 m). The following is the formula for determining a radio wave's wavelength: Wavelength is equal to c/f, where c is the speed in meters per second, and f is the frequency in Hertz.

A wave train's speed (v) in a medium is equal to its frequency (f), hence the formula for wavelength is v/f. Wavelength is typically represented by the Greek symbol lambda ().

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The partial pressure of nitrogen on Venus is approximately 321.914 kPa.

To find the partial pressure of nitrogen on Venus, we need to calculate the partial pressure using the mole fraction of nitrogen and the total atmospheric pressure. First, we convert the total atmospheric pressure from psi to kilopascals (kPa) since the mole fraction is given in terms of kPa.

1 psi = 6.89476 kPa

Therefore, the total atmospheric pressure on Venus is:

1334 psi × 6.89476 kPa/psi = 9197.53 kPa

Next, we can calculate the partial pressure of nitrogen using the mole fraction. The mole fraction of nitrogen is given as 0.035, which means that nitrogen makes up 3.5% of the total moles of gas in the atmosphere.

The partial pressure of nitrogen is given by:

Partial pressure of nitrogen = Mole fraction of nitrogen × Total atmospheric pressure

Partial pressure of nitrogen = 0.035 × 9197.53 kPa

Partial pressure of nitrogen = 321.914 kPa

Therefore, the partial pressure of nitrogen on Venus is approximately 321.914 kPa.

It's important to note that the given atmospheric composition of Venus's atmosphere and the total atmospheric pressure are approximate values and can vary depending on specific conditions and measurements.

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A quasar is a star that emits intense radio and light energy.

A quasar is an extremely bright radio source. It is called a quasi-stellar radio source. It appears to be like a star but is not a star. These quasars are young galaxies that are located far away from us and are highly luminous. The luminosity of a quasar is 1000 times greater than the luminosity of a milky way galaxy.

A quasar is powered by a supermassive black hole with its mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc.

The quasars were first discovered in the 1950s using the Hubble space telescope and were found to be a massive bright source emitting radio waves of unknown origin. But now, millions of quasars were discovered.

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