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The skydiver is falling at a velocity of 212 kilometres per hour. The speed of the skydiver is 212 miles per hour.

If a skydiver leaps out of a plane and lands at 212 mph, it is necessary to know the skydiver's velocity and speed. Velocity is speed with a direction, whereas speed just exists as a number with a speed unit at the end. While velocity refers to both the speed and direction of an object's motion, speed is the rate at which an object moves along a path over time. The skydiver is falling at a speed of 212 kilometres per hour. 212 kilometres per hour is the speed at which the skydiver is travelling. Speed is the rate at which an object travels along a path over time, as opposed to velocity, which describes the speed and direction of an object's motion. A scalar quantity is speed.

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Alcoholic fermentation and lactic acid fermentation are distinct processes and both involves Anaerobic process, Production of NAD+, Recycling of Electron Carriers, Microorganism Involvement.

Alcoholic fermentation and lactic acid fermentation are both anaerobic processes that occur in living organisms. They are similar in that they are metabolic pathways that help cells produce energy in the absence of oxygen. Here are some key similarities between the two processes:

Anaerobic Process: Both alcoholic fermentation and lactic acid fermentation occur in the absence of oxygen. They are alternative pathways for cells to generate energy when oxygen is not available or in limited supply.

Production of NAD+: Both fermentation processes are involved in the regeneration of NAD+ (nicotinamide adenine dinucleotide), which is necessary for the continuation of glycolysis. In both processes, NADH (reduced form) is oxidized to NAD+ (oxidized form), allowing glycolysis to proceed.

Recycling of Electron Carriers: Alcoholic fermentation and lactic acid fermentation recycle the electron carriers produced during glycolysis. NADH generated during glycolysis is oxidized back to NAD+ through the fermentation process, enabling glycolysis to continue and produce ATP.

End Products: While they have some similarities, the main difference between alcoholic fermentation and lactic acid fermentation lies in the end products produced. In alcoholic fermentation, the end products are ethanol (alcohol) and carbon dioxide. In lactic acid fermentation, the end product is lactic acid.

Microorganism Involvement: Alcoholic fermentation is commonly carried out by yeast and some bacteria, whereas lactic acid fermentation is primarily performed by certain bacteria and muscle cells.

Despite these similarities, it's important to note that alcoholic fermentation and lactic acid fermentation are distinct processes with their own specific characteristics and functions in different organisms.

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Answer: type the compound into your search bar then it should tell you what it is for 3. you should look up "what is the formula for -----" same thing for #4

Explanation:

Answer:

2.a.  germanium tetrahydride

2.b. dinitrogen tetrabromide

2.c. diphosphorus pentasulfide

2.d. selenium dioxide

2.e. nitrogen trihydride

2.f. silicon dioxide

3.a. PO3

3.b. SiCl4

3.c. N2O5

3.e. N2O4

3.f. CO

4.a CO2

4.b. SF6

4.c. N2Cl4

4.d. CI4

4.e. PF5

4.f. P2O5

****All numbers are subscripts, please do not write them as is, but to the bottom right of them like shown in the options from question 2.

Explanation:

To name covalent compounds (NM+NM), we use prefixes.

To name covalent compounds goes as follows:

First, name the first element in the formula the normal name it has (ex. Nitrogen, Oxygen). If the first element is present more than once shown by a subscript, use a prefix that will indicate how many there are present (ex. mono, di, tri).

Next, name the second element in the compound using prefixes aswell if present more than once. These elements though, will end with -ide instead of their original name (ex. monoxide, dibromide, trichloride).

An amide that has a molecular ion with an m/z value of 129.

The molecular formula is C₉H₁₃NO.

To determine the molecular formula of the amide with an m/z value of 129, we need to consider the possible combinations of carbon (C), hydrogen (H), nitrogen (N), and oxygen (O) that would yield that molecular mass.

The m/z value of 129 indicates the mass-to-charge ratio of the molecular ion. Since we're dealing with a neutral molecule, we can assume a charge of +1 for the molecular ion. Therefore, the molecular mass would be equal to 129.

To find the molecular formula, we can consider different combinations of elements that sum up to a molecular mass of 129. Here are a few possibilities:

1. C₈H₁₁NO: In this case, the sum of the atomic masses is (8 × 12.01) + (11 × 1.01) + 14.01 + 16.00 = 128.09, which is close to the desired molecular mass but not exactly 129.

2. C₈H₁₀N₂O: In this case, the sum of the atomic masses is (8 × 12.01) + (10 × 1.01) + (2 × 14.01) + 16.00 = 128.14, which is also close to 129 but not exact.

3. C₉H₁₃NO: In this case, the sum of the atomic masses is (9 × 12.01) + (13 × 1.01) + 14.01 + 16.00 = 129.12, which is very close to 129.

Therefore, the molecular formula that best fits the given m/z value of 129 is C₉H₁₃NO.

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The activation energy of the reaction is approximately 71.46 kJ/mol, rounded to 2 decimal places.

To find the activation energy (Ea) of the reaction, we can use the Arrhenius equation, which relates the rate constant (k) to the temperature (T) and activation energy. The Arrhenius equation is given by:

k = A * e^(-Ea/RT)

Where:

k is the rate constant

A is the pre-exponential factor (frequency factor)

Ea is the activation energy

R is the gas constant (8.314 J/(mol·K))

T is the temperature in Kelvin

We have two sets of data:

At 600 K, k1 = 3.4 m^(-1)s^(-1)

At 750 K, k2 = 31.0 m^(-1)s^(-1)

Taking the natural logarithm (ln) of both sides of the Arrhenius equation, we can rearrange the equation to solve for the activation energy:

ln(k) = ln(A) - (Ea/RT)

We can create two equations using the given data:

ln(k1) = ln(A) - (Ea/(R * 600))

ln(k2) = ln(A) - (Ea/(R * 750))

Subtracting the second equation from the first eliminates the ln(A) term:

ln(k1) - ln(k2) = (Ea/R) * ((1/600) - (1/750))

Simplifying further:

ln(k1/k2) = (Ea/R) * ((750 - 600) / (600 * 750))

Now we can solve for Ea:

Ea = (R * (ln(k1/k2))) / ((750 - 600) / (600 * 750))

Using the given values and the appropriate units:

Ea = (8.314 J/(mol·K) * ln(3.4/31.0)) / ((750 - 600) / (600 * 750))

Converting the units from J to kJ:

Ea = (8.314 × 10^(-3) kJ/(mol·K) * ln(3.4/31.0)) / ((750 - 600) / (600 * 750))

Ea ≈ 71.46 kJ/mol

Therefore, the activation energy of the reaction is approximately 71.46 kJ/mol, rounded to 2 decimal places.

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Since 273 k – 243 k equals 30, the temperature change for an object going from 273 k to 243 k is 30 k.

Colors and temperatures can both be measured in Kelvin: A temperature unit commonly used in science is the Kelvin scale. Lord Kelvin created the scale after realizing the need for one with absolute zero as the zero point, which translates to 0 K as the lowest attainable temperature, or -273,15 °C.

On the Kelvin scale, a body's temperature cannot be negative. Since the Kelvin scale's absolute zero represents the lowest temperature that may exist, it is impossible for it to be negative.

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The human ear drum transfers sound waves into vibrations and into the inner ear. This statement is true.

A sound wave is the pattern of disturbance caused by the movement of energy as it propagates away from the source of the sound through a medium. Sound waves are produced by object vibrations and pressure waves, such as a ringing cellphone.

It gathers sound waves and directs them to the ear canal (external auditory meatus), where they are amplified. The sound waves then travel to the eardrum, also known as the tympanic membrane, which is a flexible, oval membrane at the end of the ear canal. The eardrum vibrates as a result of sound waves.

These vibrations are transmitted by the ear drum to the three tiny bones in the middle ear known as the malleus, incus, and stapes. The middle ear bones amplify, or increase, the sound.

Thus,The human ear drum transfers sound waves into vibrations and into the inner ear.

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Answer:

57

Explanation:

a mass number is protons plus neutrons so we add them

30+27

57

Hopes this helps please mark brainliest

Answer:

57

Explanation:

the other guy is right

Answer:

28

Explanation:

In the hydrogenation of alcohol, Ethanol is the reducing agent and it loses electron.

Alcohol hydrogenase transform ethanol to Acetaldehyde. This known as carcinogen. In this Acetaldehyde is more toxic compound. Alcohol dehydrogenases catalyze the oxidation of primary and secondary alcohols to the corresponding aldehyde or ketone by the transfer of a hydride anion to NAD+ with release of a proton.

Ethanol + NAD^+ ---> acetaldehyde + NADH + H^+

The half reactions are:

Ethanol --------->Acetaldehyde + 2H^+ + 2e (oxidation)

NAD+ + 2H+ + 2e- ------->NADH + H^+ (Reduction)

Ethanol is oxidized to acetaldehyde, because it loses e- .NAD+ is reduced to NADH, because it gain of e− . NAD is the oxidizing agent. Oxidizing agent gains e− and therefore reduced during reaction. Ethanol is the reducing agent. Reducing agent loses e−and therefore oxidized during reaction . Alcohol dehydrogenase is also involved in the toxicity of other types of alcohol.

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Scientific theories are always testable and a theory may be changed as a result of new observations.

A scientific theory can be described as a structured explanation to explain the facts of the natural world that commonly incorporates a hypothesis and laws.  Any scientific theory should be based on a rational and careful examination of the facts.

There is a distinction between facts observed and theories in the scientific method, which are interpretations of the data and facts or explanations of scientists.

If contradictions to the predictions of the theory are measured, scientists should evaluate whether the experimental design was fine and accurate the results by repeating the experiments.

Solutions can need some changes to the theory or none at all, and after successive corrections, theories will be improved and greater accuracy can be achieved.

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Let's find the masses of carbon and hydrogen from the masses of our products

for carbon:

\(23.98 g (CO_2) * \frac{12 g (C)}{44g (CO_2)}\)

mass of carbon = 6.54 gram

for hydrogen:

\(4.91 g (H_{2}O) * \frac{1 g (H)}{18 g (H_{2}O)}\)

mass of hydrogen = 0.27 gram

Total mass of carbon and hydrogen:

Mass of Carbon + Mass of Hydrogen = 6.54 + 0.27 = 6.81 gram

since we had a 10 gram sample, the rest of the mass must be because of Oxygen. so,

Mass of Oxygen:

Mass of compound  - Mass of carbon and hydrogen

10 - 6.81 = 3.19 gram Oxygen

Finding number of moles:

Moles of Carbon:

\(\displaystyle moles = \frac{given~mass}{molar~mass} = \frac{6.54~grams}{12~\frac{grams}{mole}} = 0.6~moles\)

Moles of Oxygen:

\(\displaystyle moles = \frac{given~mass}{molar~mass} = \frac{3.19~grams}{16~\frac{grams}{mole}} = 0.2~moles\)

Moles of Hydrogen:

\(\displaystyle moles = \frac{given~mass}{molar~mass} = \frac{0.27~grams}{1~\frac{grams}{mole}} = 0.3~moles\)

Empirical Formula:

Carbon : Hydrogen : Oxygen

0.6 : 0.3 : 0.2

6 : 3 : 2

C₆H₃O₂

Answer:

Density

Explanation:

It's an intensive property because it doesn't depend on mass

3 g/mL is the density in grams per millititer to three significant figures.

To express the density of a cube of butter in grams per milliliter, we need to convert the weight from pounds to grams and the volume from cubic inches to milliliters.

1 pound is approximately equal to 453.592 grams, so the weight of the cube of butter in grams would be:
0.260 lb * 453.592 g/lb = 117.81992 g (rounded to three significant figures as 118 g)

1 cubic inch is equal to approximately 16.387 milliliters, so the volume of the cube of butter in milliliters would be:
\(1303 cubic inches * 16.387 mL/in^3 = 21,365.861 mL\) (rounded to three significant figures as 21,400 mL)

Therefore, the density of the cube of butter would be:
Density = Mass / Volume

= 118 g / 21,400 mL

= 0.00551 g/mL (rounded to three significant figures as 0.005 g/mL)

For the gem, we already have the mass as 600 g and the volume as 200 mL.

Therefore, the density of the gem would be:
Density = Mass / Volume

= 600 g / 200 mL

= 3 g/mL (rounded to three significant figures)

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Answer:

B

Explanation:

Answer:

BBBBBBBBB

Explanation:

Answer:

C. Chemical energy - Electrical energy - Sound energy

Explanation:

According to the law of conservation of energy, energy can be transformed i.e changed from one form to another. According to this question, a student builds an electrical circuit, which connects a battery to a siren. Based on this description, the electrical circuit uses ELECTRICAL ENERGY supplied by the CHEMICAL ENERGY in the battery cell.

The electrical energy in the circuit connects the CHEMICAL ENERGY in the battery to the siren, which makes the sound using SOUND ENERGY. In other words, the CHEMICAL ENERGY of the battery powers the ELECTRICAL ENERGY of the circuit to make SOUND ENERGY in the siren. Hence, the order of energy transformation is: Chemical energy - Electrical energy - Sound energy

Answer:

C. Chemical energy - Electrical energy - Sound energy

Explanation: I took the test:)

The 310 kelvin temperature required for 0. 0470 mol of gas to fill a balloon to 1. 20 l under 998 atm pressure

The macroscopic characteristics of ideal gases are related by the ideal gas law (PV = nRT). A gas is considered to be perfect if its particles (a) do not interact with one another and (b) occupy no space (have no volume). Although there is no such thing as an ideal gas, the ideal gas law does offer a good approximation of real gas behavior in many situations.

T = PV/nR

T = 998 atm x 1. 20 L / 0. 0470 x 0.0821

T = 310k

Hence, 310 kelvin temperature required for 0. 0470 mol of gas to fill a balloon

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The metal = Platinum(Pt)

FCC : Face centered cubic : the unit structures of the unit cell((other than BCC, HCP)

In FCC ⇒ atoms on every corner and side (total 4 atoms)

The length of the face diagonal (b) = 4 times the atomic radius  (r)

Formula :

\(\tt b=4r\)

\(\tt a=r\sqrt{8}\)

\(\tt V=16r\sqrt{2}=a^3\)

\(\tt \rho=\dfrac{n.Ar}{V.No}\)

Ar = atomic mass, g/mol

No = Avogadro number = 6.02.10²³

n = number of atoms

V = volume (cm³)

a = side length  

b = diagonal of the side surface  

r = atomic radius

a= 392 pm=3.92 x 10⁻⁸ cm

ρ = 21.45 g/cm³

\(\tt V=a^3\\\\V=(3.92\times 10^{-8})^3\\\\V=6.024\times 10^{-23}~cm^3\)

The atomic mass :

\(\tt 21.45~g/cm^3=\dfrac{4\times Ar}{6.024\times 10^{-23}\times 6.02\times 10^{23}}\\\\Ar=194.47\approx 195~g/mol\)

radius :

\(\tt a=r\sqrt{8}\\\\3.92\times 10^{-8}=r\sqrt{8}\\\\r=1.386\times 10^{-8}~cm\)

Element with atomic mass 195 g/mol and radius = 139 pm (1.386x10⁻⁸cm) = Platinum(Pt)

The number of moles of \(Na_2SO_4\) form from 5.0 moles \(Na_2S\) is 5 moles.

Limiting reactants are those reactants that are completely used up in a chemical reaction.

4.0 mol \(Na_2S\) will be completely used since the combining ratio is 1 : 1 : 1.

\(Na_2S + CuSO_4\) ->\(Na_2SO_4 + CuS\)

From the chemical equation above, 5.0 moles \(Na_2S\) will yield 5 moles of \(Na_2SO_4\).

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Answer:

D. \( O^{2-}\)

Explanation:

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.

Oxygen has a total number of eight (8) electrons and as such the \( O^{2-}\) is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon that has a total number of ten (10) electrons.

Hence, \( O^{2-}\) contains the same number of electrons as an atom of neon.

There would be a sea of electrons encircling the nuclei in gold, Au.

These electrons can freely transfer between these atoms once bonds between them are formed. The array of positively charged atomic nuclei that make up a metal can therefore be visualized as being submerged in a sea of moving electrons.

According to the "electron sea" hypothesis, metal atoms in solids shed their outermost electrons to arrange themselves into a regular lattice of positive metallic ions. The outside electrons are not "belonging" to any particular atom; instead, they create a sea or pool of delocalized electrons that are free to roam around the constant lattice of positive ions at random.

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Answer: Fe

Explanation: Metals have a sea of electrons surrounding the nuclei.

The de Broglie wavelength of the fullback is approximately 7.584 × 10^(-28) nanometers.

To determine the de Broglie wavelength of the fullback, we need to convert the speed from miles per hour (mi/hr) to meters per second (m/s) since the de Broglie wavelength equation requires SI units.

1 mile = 1609.34 meters (approximately)

1 hour = 3600 seconds (approximately)

Converting the speed:

19.6 mi/hr * 1609.34 m/mile / 3600 s/hour ≈ 8.749 m/s

Now, we can calculate the de Broglie wavelength using the following equation:

λ = h / p

where λ is the de Broglie wavelength, h is the Planck constant (6.62607015 × 10^(-34) J·s), and p is the momentum.

To calculate the momentum, we need to convert the fullback's weight from pounds (lb) to kilograms (kg) and use the formula:

p = m * v

where m is the mass and v is the velocity.

Converting the weight:

220 lb * 0.453592 kg/lb ≈ 99.7901 kg

Now, we can calculate the momentum:

p = 99.7901 kg * 8.749 m/s ≈ 872.367 kg·m/s

Finally, we can calculate the de Broglie wavelength:

λ = 6.62607015 × 10^(-34) J·s / 872.367 kg·m/s ≈ 7.584 × 10^(-37) meters

To convert the wavelength to nanometers, we multiply by 10^9:

λ = 7.584 × 10^(-37) meters * 10^9 nm/meter ≈ 7.584 × 10^(-28) nanometers

Therefore, the de Broglie wavelength of the fullback is approximately 7.584 × 10^(-28) nanometers.

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Answer:

5

Explanation:

Answer

bitly coin download

Explanation:

bitly coin download

Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Silver, or 107.8682 grams.

Explanation:

I took a test about this :)

When a nucleus emits an alpha particle, the mass number of the nucleus decreases, and its atomic number also decreases.

Therefore, the correct answer is: (c). The mass number decreases and its atomic number increases.

The nuclei are incredibly tiny and dense. They are 10 thousand times smaller than an atom and have more than 99.9% of its mass! Protons, which have a positive charge, and neutrons, which have no electrical charge, make up the nucleus.

When a nucleus emits an alpha particle, the mass number of the nucleus decreases, and its atomic number also decreases.

An alpha particle is composed of two protons and two neutrons, which is equivalent to a helium nucleus (He²⁺). When an alpha particle is emitted from a nucleus, the mass number decreases by 4 (as the alpha particle has a mass of 4 atomic mass units) and the atomic number decreases by 2 (since the nucleus loses two protons).

Therefore, the correct answer is:

c. The mass number decreases and its atomic number increases.

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Answer:

Answer

Change in temperature

It is an example of an endothermic reaction. It is absorbing heat.