Why do you blow into the tubes with phenol red in the photosynthesis lab?

It is to be noted that the Total Distance traveled is 130 meters while the total displacement is 40 meters to the right.

A displacement is a vector in geometry and mechanics whose length is the smallest distance between the beginning and final positions of a moving point P.

Displacement = final position - beginning position = change in position is the formula.

The distance is determined by adding up all the ground that was covered. That is, add the distances from A to B, then from B to C to D, and then from D to E.  This means one must add 40 m (A to B) and 45 m (B to C to D) and 45 m (D to E).

The displacement is determined by simply measuring from the starting position (A) to the final position (E). This is 40 m, directed to the right.

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Full Question:

A car in a parking lot travels back and forth in a parking lane in an effort to find a good parking spot. Given the images attached, find the Distance traveled and the Displacement.

Isotopes are atoms that belong to the same element: 11 protons, 10 neutrons, 11 electrons, 13 protons 14 neutrons, and 13 electrons

An isotope is one of two or more atom types of a chemical element that share the same atomic number, position on the periodic table, chemical behavior, and physical properties, but differ in atomic mass. One or more isotopes can be found in any chemical element. The number of protons in an atom's nucleus is the first criterion for determining its identity and labeling.

The observation that all atoms with the same atomic number have roughly the same chemical properties—if not exactly the same—gives this atomic number its significance. The symbol Z is typically used to represent this number. An ingot of pure uranium, for instance, only contains atomic number 92 atoms. Each atomic number has a place on the periodic table of elements, and each of these places is labeled with the element's common name, like calcium, radon, or uranium.

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All of the statements are true

Electrons and proton are a type of subatomic particle with a negative and positive charge. Protons are held together in the atom's nucleus by the nuclear force. A subatomic particle without charge is the neutron.

The electron, the smallest constituent part of an atom, has a negative charge. Protons and electrons are present in an atom in a neutral state in an equal number. One electron and one proton are all that the hydrogen ion has. On the other hand, the atomic nucleus possesses 92 protons, that means 92 electrons.

Electrons are present outside of the atom's nucleus, in contrast to neutrons and protons that are contained inside the nucleus at its center. Negative electrons are drawn to the positively charged nucleus so because electric charges of opposite sign attract one another.

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The photons have been calculated to contain about 4.97 * 10^-47 J/mol of energy.

We know that a photon is a unit of light. Better put, we can see the photon as a bundle of light and we are able to obtain the energy of that bundle of light as we can see.

Given that;

E = hf

E = energy of the photon

h = Plank's constant

f = frequency of the photon

Then

E = 6.6 * 10^-34 Js * 4.53 x 10^10 s-1

E =  2.99 * 10^-23 J

A mole would have to contain about 6.02 * 10^23 molecules so;

Energy per mole =  2.99 * 10^-23/6.02 * 10^23

= 4.97 * 10^-47 J/mol

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Missing parts;

How much energy, in joules per mole (J/mol), does a photon in the microwave region of the EM

spectrum, contain? Assume the microwave has a frequency of 4.53 x 1010 s-1. Your answer should

have 3 significant figures.

Answer:

I dont a picture

Explanation:

but the answer is 24

Answer: The four ions formed are \(H^+\) , \(OH^-\) , \(Na^+\) and \(Cl^-\)

Explanation:

Electrolysis is the process where electricity is used to drive chemical reactions.

In the electrolysis of aqueous solution of sodium chloride, hydrogen gas produces at the cathode which is a negative electrode and chlorine gas produces as the anode which is a positive electrode and the sodium hydroxide remains dissolved in the solution.

The reactions will be :

\(NaCl\rightarrow Na^++Cl^-\)

\(H_2O\rightarrow H^++OH^-\)

Hence, electrolysis of an aqueous solution of sodium chloride lead to the formation of four ions,\(H^+\) , \(OH^-\) , \(Na^+\) and \(Cl^-\)

Answer:

it states that the total mass of the products are the same as the total mass of the reactants in a chemical reaction.

Explanation:

The number of moles of HF needed to react with 0.3 mol of Na₂SiO₃ is 0.24 moles.

The given reaction is,

Na₂SiO₃ (s)+HF (aq) -----> H₂SiF₆ (aq)+NaF (ag)+H₂O (l). This equation is to be balanced at first which is given by,

Na₂SiO₃+8HF-----> H₂SiF₆+ 2NaF + 3H₂O

In addition to that, the number of moles of Na₂SiO₃ given is 0.300 moles.

It can be clearly seen from the reaction that 1 mole of Na₂SiO₃is needed to react with 8 moles of HF. Therefore,

0.300 mol of Na₂SiO₃ will need the following amount of HF,

                                = 8x0.3

No of moles of HF = 0.24 mole of HF

Therefore, the 0.24moles of HF is required to react with 0.300 moles of NaSiO3.

In this way, the number of moles required could be computed easily.

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Answer:

Explanation:

Here, we want to get the mass required to make the given volume

To get this we need to get the number of moles

To get the number of moles, we have to multiply the volume by the molarity

Mathematically, we have that as:

The volume can be converted to liters by dividing by 1000

So we have the volume as 311/1000 = 0.311 L

Thus, we have the number of moles as:

To get the mass, we have to multiply the number of moles by the molar mass

The molar mass of NaCl is 58.44 g/mol

Thus, we have the mass as:

Answer:

887 ML

Explanation:

yup

Answer:

An ion is formed by the loss or gain of electrons by an atom, so it contains an unequal number of electrons and protons. Example: Sodium ion Na+, magnesium ion Mg2+, chloride ion Cl–, and oxide ion O2–. There are two types of ions : cations and anion

Based on the given fact Mixture 1 has the fastest initial rate in the reaction 2NO(g) + O\(_2\)(g)----2NO2\(_2\)(g), where the rate is second order in NO and first order in O2.

The reaction is given as:

2NO(g) + O\(_2\)(g)----2NO2\(_2\)(g)
The rate law for this reaction can be written as:

Rate = k\([NO]^2[O_2]\)

where k is the rate constant, [NO] is the concentration of NO, and [O\(_2\)] is the concentration of O2. To determine which mixture has the fastest initial rate, we need to compare the initial concentrations of NO and O\(_2\) in each mixture.

Mixture 1:
- High concentration of NO
- High concentration of O\(_2\)

Mixture 2:
- Low concentration of NO
- High concentration of O\(_2\)

Mixture 3:
- High concentration of NO
- Low concentration of O\(_2\)

Now let's compare the mixtures based on the rate law:

Mixture 1: Rate = k(x)\([High\ NO]^2\) [High O\(_2\)] = k(High NO^2)(High O\(_2\))
Mixture 2: Rate = k([Low NO\(]^2\))[High O\(_2\)] = k(Low NO^2)(High O\(_2\))
Mixture 3: Rate = k([High NO\(]^2\))[Low O\(_2\)] = k(High NO^2)(Low O\(_2\))

Since the rate is second order in NO, the effect of NO concentration is more significant than that of O\(_2\). Mixture 1 has both high NO and high O\(_2\)concentrations, which results in the highest rate among the three mixtures.

Therefore, the fastest initial rate occurs in mixture 1.

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To calculate the volume of the reactor and space-time for a reversible gas phase reaction, A+2B, conducted at 540 °F and 3 atm with a feed rate of 75 lb mol/h and 40% A, and an equilibrium conversion of 75%, we need to consider the specific reaction rate and the concentration equilibrium constant.

The space-time for a reactor is defined as the volume of the reactor divided by the feed rate. To calculate the volume of the reactor, we first determine the molar flow rate of component A, which is 75 lb mol/h * 0.40 = 30 lb mol/h. Then, we divide the molar flow rate of A by the specific reaction rate to obtain the volume: Volume = 30 lb mol/h / (1.6 s * 3600 s/h) = 5.2083 ft³.

To calculate the space-time, we divide the volume by the feed rate: Space-time = 5.2083 ft³ / 75 lb mol/h = 0.0694 ft³/lb mol/h.

Therefore, the volume of the reactor is 5.2083 ft³ and the space-time is 0.0694 ft³/lb mol/h.

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Manipulation of the independent variable directly, Extraneous variable control, Extraneous variable control, statistically correct for the variable's influence.

define experimental ?

relating to, based on, or having the nature of experiment: an experimental study. based on or derived from experience; empirical: experimental evidence. tending to experiment: an experimental artist. tentative or provisional: an experimental rule in football.

an experimental science. relating to, developed from, or founded on experiment: an experimental science. of the nature of an experiment; provisional:

The new software is still in the testing phase.

An experimental aeroplane is one that is in the process of being tested.

based on or drawn from experience; empirical: experimental knowledge.

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Answer:

2.6299

its easy

The shape of a molecule is determined by the valence shell electron pair repulsion theory.

The shape of a molecule is determined by the valence shell electron pair repulsion theory. We know that this theory has to do with the number of electron pairs that are found on the valence shell of the central atom of the molecule.

Let us now talk about each of the molecules;

1) OF2 - This molecule is polar and has a V shape. The direction of the dipole is towards the fluorine atom and the bond angles in the molecule is 103º.

2) BI3 - The compound is nonpolar because it is symmetrical as such the compound is trigonal planar and the dipoles cancel out. The bod angles in the molecule is  120°.

3) NF3 - The molecule NF3 is polar because of the net dipole moment arising from the trigonal pyramidal structure of the molecule. The bond angle of the molecule is 101.9°.

4) CIF3 - The molecule CIF3 is a polar molecule and the structure is a T shape owing to the two lone pairs on the chlorine atom. The bond angle in the molecule is 175o

5) IF4- The molecule IF4- is nonpolar and has a square planar geometry with the two lone pairs lying above and below the plane. The bond angle here is 90 degrees.

6) SBr6 - The molecule is a nonpolar molecule due to the symmetrical nature of the octahedral molecule. The bond angle of the molecule is 90 degrees as all the Br atoms are found at the corners f a regular octahedron.

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The amount of KNO₃ would dissolve in 100g of water at 50 degrees celcuis to make a saturated solution is 44 g.

To create a saturated solution of KNO₃ in 100g of water at 50 degrees Celsius, the following steps should be taken:

Step 1: Find out the mass of the solvent in the saturated solution.

The solvent is water in this instance. So, using the formula for the mass of a solution, we can calculate the mass of the solvent in the saturated solution as follows:

Mass of solvent = Mass of solution - Mass of solute

= 100 g - Mass of KNO₃

Step 2: Determine the amount of solute that would be dissolved in the solution to make it saturated.

The mass of KNO₃ that would dissolve in 100 g of water at 50°C to create a saturated solution is 56g/100g of water.

Step 3: Calculate the mass of KNO₃ that would dissolve in 100g of water to make a saturated solution.

Mass of KNO₃ = Solubility of KNO₃ × Mass of solvent

Mass of KNO₃ = 56 g/100 g × (100 g - Mass of KNO₃)

Now, let's solve for Mass of KNO₃;

56 = 56g(100-Mass of KNO₃)/100100 - Mass of KNO₃ = 100

Multiply both sides of the equation by 100 to obtain;

5600 - 100 Mass of KNO₃ = 100

Mass of KNO₃ = 5600/10100 - 56

= 44 g

Therefore, 44 g of KNO₃ would dissolve in 100g of water to make a saturated solution.

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In the following lab activities:

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction, only rearranged. Therefore, the total mass of the reactants must be equal to the total mass of the products. In the case of the decomposition of hydrogen peroxide, the loss of mass can be explained by the fact that some of the products, namely the oxygen gas, escape into the surroundings, leading to a decrease in the total mass of the system.

When the unknown solution is mixed with potassium sulfate, no visible reaction occurs. Therefore, it is not possible to determine the identity of the unknown solution based on this observation alone.

Possible balanced molecular equations for the reactions that occurred are:

Unknown + Potassium Carbonate → Magnesium Carbonate + Potassium Nitrate

Mg(NO₃)₂ + K2CO₃ → MgCO₃ + 2KNO₃

Unknown + Potassium Sulfate → No Reaction

Mg(NO₃)₂ + K2SO₄ → No Reaction

Based on the observations, the unknown solution is likely magnesium nitrate, as a reaction occurred when it was mixed with potassium carbonate, but no reaction occurred when it was mixed with potassium sulfate. This suggests that the unknown solution contains carbonate ions and not sulfate ions.

The identity of the unknown solution can be justified by using the solubility rules. Magnesium nitrate is soluble in water, as are potassium nitrate and magnesium carbonate. Potassium sulfate is also soluble in water. Therefore, when the unknown solution is mixed with potassium sulfate, no reaction occurs as both substances are soluble in water. However, when the unknown solution is mixed with potassium carbonate, magnesium carbonate is formed, which is insoluble in water and precipitates out of solution. This reaction suggests that the unknown solution contains magnesium ions and carbonate ions, indicating that it is magnesium nitrate.

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Answer:

Desert gravel

Explanation:

A desert is an arid region where precipitation is very low all year round.

Wind action such as erosion, transportation and deposition is the most active denudation force in this sort of terrain.

Answer: B

Explanation:

Answer: the longest a virus that can be kept on a plastic bag is a few hours to a couple of days.

Explanation: hope that helped!(:

Answer:

Correct

Explanation:

According to the balanced chemical reaction, 2 mol FeBr3 are consumed for every 3 mol Na2S consumed.

A balanced equation obey the law of conservation of mass. The coefficients are the numbers which are added to balance the chemical equation. Here the given mole ratio is correct.

An equation in which the number of atoms of reactants and products on both sides of the equation are balanced is defined as the balanced chemical equation. The coefficients which are added in front of the formula of each component represents the number of the species.

A molar ratio denotes the ratio between the amounts in moles of any two compounds involved in a balanced chemical reaction. By comparing the coefficient of each component, the mole ratio can be determined.

Here for the given reaction, for every 3 moles of Na₂S consumption 2 moles of FeBr₃ is also consumed. So the molar ratio of Na₂S to FeBr₃ is 2/3. Molar ratios are used as the conversion factors between products and reactants in many chemistry problems.

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Large polar and charged molecules face challenges in crossing biological membranes due to the hydrophobic nature of the lipid bilayer that forms the membrane.

The lipid bilayer acts as a barrier to the movement of  large polar and charged molecules. However, there are several mechanisms by which large polar and charged molecules can cross biological membranes:

1. Protein channels or pores: Membrane proteins called channels or pores can form openings in the lipid bilayer that allow specific ions or molecules to pass through.

These channels are often selective and regulate the passage of specific molecules based on size, charge, or other properties.

2. Transporters or carriers: Membrane transport proteins, known as transporters or carriers, facilitate the transport of large polar molecules across the membrane.

These proteins undergo conformational changes to bind with the molecule on one side of the membrane and release it on the other side.

3. Vesicular transport: Large molecules can be transported across membranes through vesicular transport processes.

Endocytosis involves the engulfment of molecules by the membrane to form a vesicle that is internalized into the cell.

Exocytosis, on the other hand, involves the fusion of vesicles containing molecules with the cell membrane, leading to their release outside the cell.

4. Active transport: Some large polar or charged molecules may be actively transported across the membrane against their concentration gradient using energy derived from ATP.

This process requires specific transporter proteins and is often used for the uptake or elimination of important ions or molecules.

5. Facilitated diffusion: Facilitated diffusion is a passive transport mechanism that relies on carrier proteins to transport specific molecules across the membrane down their concentration gradient.

Although it does not require energy, facilitated diffusion is selective and often limited by the availability of carrier proteins.

It's important to note that the specific mechanism utilized by a particular molecule to cross the membrane depends on its properties, such as size, charge, concentration gradient, and availability of transport proteins.

The presence and abundance of specific transport proteins in the membrane also play a significant role in determining the permeability of large polar and charged molecules.

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Answer:

The effective nuclear charge for a 2nd row electron in Sulfur is +8

Explanation:

Zeff = Z (# of protons) - S (# of shielded electrons)

Since there are 8 electrons in the first and second rows combined, there are 8 shielding electrons.

The number of protons in Sulfur is 16.

Therefore,

Zeff = 16 - 8

Zeff = 8

(It's been awhile, so I am not 100% sure)

The effective nuclear charge for a 2nd row electron in sulfur is 14.

Sulfur has 16 atomic number means 16 number of protons and we know that in the first shell or orbit 2 electrons are present which produces a shielding effect due to its fast motion.

Its 2s electrons are shielded only by the two 1s electrons, therefore the second row electron experience an effective nuclear charge i.e. Z effective = 16 − 2 = 14 so we can conclude that the effective nuclear charge for a 2nd row electron in sulfur is 14.

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First, we need to make the exponent of 10 the same for both.

So let's transform 6.5500 x 10^5 into some number x 10^3.

For this, we need to move the dot to the right, some places where it gives the number 3. In this case, 2 places.

655.00 x 10^3

now we can sum the numbers

8.6500 x 10^3 + 655.00 x 10^3 = 663.65 x 10^3

now we need to transform this number into scientific notation. For this, must have only one number before the dot(on the left side of the dot). We will move the dot to the left, 2 places:

6.6365 x 10^5

Answer: 6.6365 x 10^5