so2 (5.00 g) and co2 (5.00 g) were placed in a 750.0 ml container at 50.0 °c. the total pressure in the container was __________ atm.
a. 0.192 b. 4.02 c. 2.76 d. 6.78 e. 1.60

Answer:

A. the electric motor

Explanation:

A cell is a biological molecule which is the basic and functional unit of life. Cells undergo series of processes to function appropriately. ATP is an acronym for adenosine triphosphate, which is the source of energy for various cell processes.

In the given mechanical system, the electric motor provides the energy required energy to drive the system. Therefore, the electric motor has the same major function of providing energy for the system as the ATP in a cell.

Answer:

B spiracles

Explanation:

These are the tubes connected to the openings in their sides

Insects use tiny openings in their body wall called spiracles to get oxygen. They are also called tracheal tubes. Hence, option B is correct.

An insect's inside functions almost like a sponge. Because a sponge has tiny holes that allow water to enter, it becomes moist. Spiracles are similar to this. They allowed oxygen to enter the bug's body. They then release carbon dioxide.

Insects can open and close their spiracles . This is accomplished through certain muscles . To drive oxygen  through their bodies, insects can also contract their muscles. The oxygen inside them is spread out by doing this.

Stomata is the reparatory organ in plants and gills are the organ in aquatic livings for respiration. In mammals lungs are the respiratory organ. Therefore, option B is correct.

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Number of moles of gas that would occupy a volume of 22.4 L at pressure of 745 torr and a temperature of 26⁰C is 90811.4 moles of gas.

An ideal gas is a theoretical gasoline composed of many randomly moving point debris that aren't challenge to interparticle interactions. the suitable fuel concept is useful because it obeys an appropriate fuel law, a simplified equation of nation, and is amenable to evaluation under statistical mechanics.

Calculation:-

By ideal gas law,

PV = n RT

P = pressure of gas, given = 745 torr = 99325 Pa

V = volume of gas, given = 22.4 L

n = number of moles of gas

R = gas constant, given = 0.0821

T = temperature of a gas, given = 299 K

Put the values in formula, PV = nRT

n = PV/RT

n = 90811.4

Hence, the moles of gas is 90811.4.

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Answer:

This question is unclear, the comprehensive question is:

To bring heavy boxes down a flight of stairs, Tyrone uses a ramp. He slides the boxes down the ramp. The movement transforms one type of energy into two other forms. Which of the following describes the way that most of the energy is transformed:

ANSWER:

Potential energy into heat and kinetic energy

Explanation:

According to this question, a ramp is used to bring heavy boxes down a flight of stairs. Tyrone does this by sliding the boxes down the ramp. The ramp is in a fixed position i.e. not moving, meaning the energy in the ramp is POTENTIAL ENERGY.

However, when the boxes slide down the ramp, the potential energy transforms to energy due to motion called KINETIC ENERGY, and HEAT ENERGY, which is caused by the friction between the boxes and the ramp.

Therefore, the potential energy of the ramp is transformed to kinetic energy in the boxes and heat energy.

Answer:

Falso.

Explanation:

El modelo cuántico (no relativista) de Schrodinger, piensa a los electrones como ondas estacionarias, tal que la amplitud de dichas ondas decae muy rápidamente cuando se "alejaban" del radio atómico. (Es decir, habia poca probabilidad de que los electrones escaparan del radio atomico, y era por ello que se quedaban orbitando cerca del nucleo). Es decir, podríamos pensar en esto como una "nube de probabilidades" más que una nube electronica

La idea de nube electrónica realmente viene de modelos previos, como el de Rutherford o el de Bhor, los cuales eran modelos clásicos.

The statement that is false is that water is the limiting reactant. Option 4

A chemical reaction is a process that involves the breaking of chemical bonds in one or more substances, and the formation of new bonds to create different substances with different chemical properties.

We know that the reaction equation is;

3Fe + 4H2O ----> Fe3O4 + 4H2

Number of moles of Fe = 5 g/56 g/mol

= 0.089 moles

Number of moles of water = 5 g/18 g/mol

= 0.28 moles

If 3 moles of Fe reacts with 4 moles of water

0.089 moles of Fe will react with 0.089 * 4/3

= 0.012moles

Thus Fe is the limiting reactant

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Answer:

1. Absolute time, also known as Newtonian time is a time that exists independent of the observer of the time, and therefore, can only be expressed through mathematics

Absolute dating is a dating method that makes use of the radioactive property of matter and is determined through dating of radioactive isotopes present

Absolute time (dating) is found through radioactive dating

2. Radioactive isotopes are atoms that have the property of unstable proton neutron combination or excess energy nucleus. They can be fined as unstable element

3. A stabilized isotope are the decay product atoms of the element which are non radioactive.

4. The half life is the time it takes the original isotope to decay into the decay product

5. To determine the age of a rock, the proportion of the original isotope to the amount of decay product in the rock is compared

6. The isotope used to date organic materials is carbon-14

7. The isotope used to date rocks with comparable age to the Earth is Uranium-238 that has a half life of 4.468 billion years

8. The half life of carbon-14 is only 5,700 years while the age of a dinosaur is between 245 and 66 million years ago, and therefore, carbon is absent in most fossils

9. Uranium-238 is only found in igneous or volcanic rocks and not in metamorphic rocks, therefore, fossils  of dinosaur as well as other fossils that are buried in sedimentary materials, including sand and clay, cannot be determined by Uranium-238

Explanation:

The basis for the ability of the potassium channel to discriminate between these two ions is the restriction of the channel desolvates sodium ions but not potassium ions. The correct answer is D.

The selectivity filter of the potassium channel is a narrow pore that is lined with protein carbonyl groups. These carbonyl groups are able to interact with the hydrated potassium ion and coordinate it, while excluding the larger hydrated sodium ion.

In addition, the size of the selectivity filter is such that it allows the passage of the smaller, dehydrated potassium ion but not the larger, dehydrated sodium ion. The channel also includes a structure called the "ion cage," which desolvates the ion by stripping off its water molecules.

This process is more effective for sodium ions than for potassium ions because the sodium ion is smaller and has a higher charge density, making it more strongly solvated by water molecules.

As a result, the potassium channel is able to discriminate between potassium and sodium ions based on their size and solvation properties.

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The  complete reaction of 28.9 grams of water with excess diphosphorus pentoxide, 105 grams of phosphoric acid will be formed.

To determine the number of grams of phosphoric acid formed, we first need to balance the chemical equation. The reaction between water (H2O) and diphosphorus pentoxide (P2O5) forms phosphoric acid (H3PO4).
The balanced equation is:
P2O5 + 3H2O → 2H3PO4
From the equation, we can see that 1 mole of P2O5 reacts with 3 moles of H2O to produce 2 moles of H3PO4.
Next, we need to convert the given mass of water (28.9 grams) to moles. The molar mass of water is 18.01528 g/mol, so:

28.9 grams H2O * (1 mol H2O / 18.01528 g H2O) = 1.6 moles H2O

Since H2O is in excess, it will fully react with the available P2O5. Therefore, the moles of H3PO4 formed will be equal to half the moles of H2O:
1.6 moles H2O * (2 moles H3PO4 / 3 moles H2O) = 1.07 moles H3PO4
Finally, we can convert moles of H3PO4 to grams using its molar mass. The molar mass of H3PO4 is 97.994 g/mol, so:
1.07 moles H3PO4 * (97.994 g H3PO4 / 1 mol H3PO4) = 105 grams H3PO4

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Non-heme iron is found in some foods that provide all the amino acids humans require for the absorption of iron.

Amino acids are defined as the substances which are considered to be the monomers of proteins.Every amino acid has the same structure  which consists  of a central carbon  bonded to an amino group , carboxyl group and a hydrogen.

Each amino acid also has  an another atom or a group of atoms bonded to the alpha carbon which are also known as the R group or the variable group of the side chain.There are 20 common amino acids which are  present in natural proteins and each amino acid has the same backbone.

The sequence and number of amino acids determines protein's shape,size and also its function. Each amino acid is attached to the other by a covalent bond formed by a dehydration reaction.

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Answer:

it looks smaller for sure ^_^

The commonly used types of laboratory glassware are pipettes and funnels. The correct option is Pipettes and funnels.

Tubing is not typically considered a type of laboratory glassware.

Pipettes are used for precise measurement and transfer of liquids. They come in various forms, such as volumetric pipettes, graduated pipettes, and micropipettes, allowing for accurate dispensing of specific volumes.

Funnels, on the other hand, are used for guiding liquids or fine-grained substances into containers with small openings. They aid in controlled pouring and prevent spillage or contamination during transfers.

Therefore, the correct option is: Pipettes and funnels.

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Answer:

only the atoms present in the reactants can end up in the products.

Explanation:

Answer:

It is an exothermic reaction. Heat must be added to light the fuses of the fireworks

Explanation:

I learned this in high school chemistry.

When a chemical reaction energy releases then this type of reaction is called exothermic reaction. Therefore, the correct option is option D.

In chemistry there are various type of reaction out of which the two main types are the exothermic reaction and endothermic reaction.

Exothermic reaction is the one in which energy releases in form of heat respiration reaction is an example of exothermic reaction. In respiration food that we eat are broken down in glucose with release of energy.

Endothermic reaction is the one in which energy is taken out during the reaction. Photosynthesis is an example of endothermic reaction where sunlight energy is taken by the plants to make food. Fireworks show is an exothermic reaction. Heat must be added to light the fuses of the fireworks.

Therefore, the correct option is option D.

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Any material that will withstand a pH shift when H+ or OH- are introduced is a buffer.

Equations of equilibrium are frequently used to do this. Both types of buffers will withstand additions of any kind.

A buffer is created when a weak acid is combined with its conjugate base.

The formulas:

The weak acid equilibrium is as follows: HA(aq)-> H+(aq) + A-(aq) (aq)

Strong acid = HA (aq)

Base conjugate = A- (aq)

H+ ion neutralisation: A-(aq) + H+(aq) HA(aq); in this instance, HA is created, H+ is neutralised, and the conjugate A- is also neutralised.

OH- ions are neutralised as follows: HA(aq) + OH-(aq) In the case of H2O(l) + A-(aq), A- is produced, neutralising both OH- and HA.

Now that KOH is a strong base, we will require a weak acid HF to neutralise it.

so

KOH + HF = KF + H2O

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Answer:

Explanation: The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.

Ranking them from lowest to highest de Broglie wavelength: photon, electron, proton.

The de Broglie wavelength (λ) of a particle is inversely proportional to its momentum (p). Therefore, the particle with the highest momentum will have the lowest de Broglie wavelength.

Ranking the electron, proton, and photon from lowest to highest de Broglie wavelength, considering they have the same momentum:

1. Photon: Photons have zero rest mass, so they can have a momentum without any associated mass. Since photons have the highest speed among the three particles, their momentum will be the highest, and thus their de Broglie wavelength will be the lowest.

2. Electron: Electrons have a relatively small mass compared to protons, so at the same momentum, their de Broglie wavelength will be slightly larger than that of a photon but smaller than that of a proton.

3. Proton: Protons have a larger mass compared to electrons, so at the same momentum, their de Broglie wavelength will be larger than both photons and electrons. Therefore, the proton will have the highest de Broglie wavelength among the three particles.

So, ranking them from lowest to highest de Broglie wavelength: photon, electron, proton.

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The boiling point of mercury is 356.73 degrees Celsius, which is significantly lower than the melting point of mercury, which is -38.83 degrees Celsius (-37.89 degrees Fahrenheit). Mercury is therefore a liquid at ambient temperature. Under these circumstances, it is the only metal that is frequently found in a liquid state.

A naturally occurring chemical element called mercury is present in coal deposits as well as rock found in the earth's crust. It has the atomic number 80 and the symbol "Hg" on the periodic table. It comes in a variety of shapes:

(Metallic) elemental mercury

mercury compounds that are inorganic

methylmercury and other organic substances

Historically known as quicksilver, elemental or metallic mercury is a gleaming, silver-white metal that is liquid at ambient temperature. Older thermometers, fluorescent lamps, and certain electrical switches all utilze it. When dropped, elemental mercury fragments into smaller droplets that may pass through tiny crevices or stick firmly to some objects. At room temperature, exposed elemental mercury can evaporate and turn into a poisonous vapor that is invisible and odorless. It turns into an odorless, colorless gas when heated.

Mercury is a liquid at room temperature, which is usually approximately 25 degrees Celsius (77 degrees Fahrenheit). The boiling point of mercury is 356.73 degrees Celsius, which is significantly lower than the melting point of mercury, which is -38.83 degrees Celsius (-37.89 degrees Fahrenheit). Mercury is therefore a liquid at ambient temperature. Under these circumstances, it is the only metal that is frequently found in a liquid state.

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Methionine is always the first one to be incorporated into a newly made protein followed by identification of the only start codon on mRNA.

Amino acids are transferred by initiator tRNAs to the mRNA strand by the process of translation. Each tRNA has an anticodon, which is a group of three nucleotides that pairs with an appropriate mRNA codon to form a stable bond. The amino acid that the codon specifies is carried by the opposite end of the tRNA. AUG is one codon that serves as a "start" signal to initiate translation (it also specifies the amino acid methionine).

All newly created proteins have methionine as the first amino acid at their N-terminal end, the end of a protein that is synthesised initially, because the initiator tRNA always carries this amino acid (in bacteria, a modified version of methionine called formylmethionine is employed).

Transfer RNAs, or tRNAs, are molecules that read an mRNA's codons sequentially (from the 5' end to the 3' end) during translation.

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Answer:

I found:

ν=6×10^14Hz

Explanation:

You can consider that wavelength λ and frequency ν are related through the speed of light in vacuum c as:

c = λ ⋅ ν

so:

3 * 10⁸ = 4.9 * 10-⁷ * V

v =3 *10⁸/ 4.9 *10⁻⁷ = 6 * 10¹⁴HZ

The visible light's wavelengths are: 380–450 nm for violet (688–789 THz frequency) 450–495 nm for blue. Green: nm 495–570. Yellow: nm 570–590.

Make a conversion from wavelength to meters. Divide the wavelength in m by the speed of light, which is 300,000,000 m/s. You can now determine the wave's frequency.

What frequency exists in green light, whose wavelength is 4.90 x 10?

v=6×10^14Hz

Therefore,

Consider how the relationship between wavelength and frequency and the speed of light in a vacuum, c, looks like this:

c = λ ⋅ ν

so:

3 * 10⁸ = 4.9 * 10-⁷ * V

v =3 *10⁸/ 4.9 *10⁻⁷ = 6 * 10¹⁴HZ.

The color that visible light appears in depends on its wavelength. The color of light with the longest wavelength is red, whereas the color with the shortest wavelength is violet. The wavelengths of all the other colours of light are in between. Visible light is divided into its several colours using a prism.

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4.50 moles of O2 is required to react completely with 1.00 mol of CH3NH2.

The amount of O2 required to react completely with 1.00 mol of CH3NH2 (methylamine) can be determined by examining the balanced chemical equation for the reaction. The balanced equation for the reaction between methylamine and O2 is:

2 CH3NH2 + 9 O2 → 4 CO2 + 6 N2 + 10 H2O

From the balanced equation, we can see that the stoichiometric ratio between CH3NH2 and O2 is 2:9. This means that for every 2 moles of CH3NH2, we need 9 moles of O2 to react completely.

Since we have 1.00 mol of CH3NH2, we can calculate the amount of O2 needed by using the stoichiometric ratio:

(1.00 mol CH3NH2) x (9 mol O2 / 2 mol CH3NH2) = 4.50 mol O2

Therefore, 4.50 moles of O2 is required to react completely with 1.00 mol of CH3NH2.

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In photosynthetic reaction, the ratio of CO2 to glucose produced is 6:1. To find the moles of CO2 needed to produce .66 moles of glucose, we have to calculate the mole ratio of CO2 to glucose and multiply it by the amount of glucose required.

Given: The average human requires .66 moles of glucose (C6H12O6) per day.The photosynthetic reaction is: 6 CO2 + 6 H2O ---> C6H12O6 + 6 O2We know that for the formation of one mole of glucose, six moles of CO2 is required. So, to calculate the moles of CO2 required for .66 moles of glucose, we need to follow the steps below:Step 1: Write the mole ratio of CO2 to glucose from the balanced chemical equation.

From the balanced equation of the photosynthetic reaction;6 CO2 + 6 H2O ---> C6H12O6 + 6 O2It shows that 6 moles of CO2 reacts with 1 mole of C6H12O6. We know that the average human requires .66 moles of glucose (C6H12O6) per day.

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The molecular formula of the unknown compound is C2H2O2.

To determine the molecular formula of the unknown compound, we need to calculate the empirical formula first and then find the multiple of its subscripts to obtain the molecular formula.

Given:

Percentage of carbon = 40.0%

Percentage of hydrogen = 6.7%

Percentage of oxygen = 53.3%

Molecular mass = 60.0 g/mol

Step 1: Convert the percentages to grams.

Assuming we have 100 grams of the compound:

Mass of carbon = 40.0 g

Mass of hydrogen = 6.7 g

Mass of oxygen = 53.3 g

Step 2: Convert the masses to moles using the molar masses of the elements.

Molar mass of carbon = 12.01 g/mol

Molar mass of hydrogen = 1.008 g/mol

Molar mass of oxygen = 16.00 g/mol

Number of moles of carbon = Mass of carbon / Molar mass of carbon

= 40.0 g / 12.01 g/mol

= 3.332 mol

Number of moles of hydrogen = Mass of hydrogen / Molar mass of hydrogen

= 6.7 g / 1.008 g/mol

= 6.648 mol

Number of moles of oxygen = Mass of oxygen / Molar mass of oxygen

= 53.3 g / 16.00 g/mol

= 3.331 mol

Step 3: Determine the empirical formula by dividing the moles by the smallest value.

Dividing the moles of carbon, hydrogen, and oxygen by 3.331 gives approximately 1 for each element.

So, the empirical formula of the compound is CHO.

Step 4: Determine the multiple of the subscripts to obtain the molecular formula.

To find the multiple, we divide the molecular mass by the empirical formula mass.

Molecular mass = 60.0 g/mol

Empirical formula mass = (12.01 g/mol) + (1.008 g/mol) + (16.00 g/mol) = 29.018 g/mol

Multiple = Molecular mass / Empirical formula mass

= 60.0 g/mol / 29.018 g/mol

= 2.07

Rounding to the nearest whole number, we get 2.

Therefore, the molecular formula of the unknown compound is C2H2O2.

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Answer:

the ice becomes -20 degrees celcius colder

Explanation:

Cells have distinct and different jobs and functions in the body.

Answer:

Molar mass of (Fe(NO3)3)(H2O)9 is 403.9972 g/mole

Explanation:

the formula to find the mass of moles

Worked Example: molar mass = mass ÷ moles (M=m/n) Calculate the molar mass of a pure substance if 1.75 moles of the substance has a mass of 29.79 g.

i think it help you

Answer:

cells comes from preexisting cells through the process of cell division

Therefore, without Ca2+, the release of neurotransmitters and subsequent communication between neurons in a chemical synapse would not occur.

Ca2+ plays a crucial role in the chemical synapse as it is responsible for triggering the release of neurotransmitters from the presynaptic neuron. When an action potential reaches the terminal button of the presynaptic neuron, it causes voltage-gated Ca2+ channels to open, allowing Ca2+ ions to flow into the cell. This influx of Ca2+ causes the synaptic vesicles containing neurotransmitters to fuse with the presynaptic membrane and release their contents into the synaptic cleft. The neurotransmitters then bind to receptors on the postsynaptic membrane, triggering a response in the receiving neuron.

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