When molecules fluoresce, the emitted photon has ________ energy compared to the absorbed photon.

Suppose that 9 good fuses and 4 defective ones have been mixed up. The defective fuses, we test them one-by-one, at random. The probability that we are lucky and find both of the defective fuses in the first two tests is 1/13.

We can use the concept of probability. There are 13 fuses in total, and we are looking for a specific order of the first two being defective. For the first test, the probability of selecting a defective fuse is 4/13 (since there are 4 defective fuses and 13 total fuses). Once we have found one defective fuse, there are now 3 defective fuses remaining and a total of 12 fuses. For the second test, the probability of selecting another defective fuse is 3/12, which can be simplified to 1/4.

To find the probability of both events happening consecutively, we multiply the probabilities of each individual event: (4/13) * (1/4) = 4/52, which simplifies to 1/13.  So, the probability of finding both defective fuses in the first two tests when there are 9 good fuses and 4 defective ones is 1/13.

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The coefficients of the balanced equation, written as stated as 6:1:3:2 the reaction of water with the by-product magnesium nitride to produce ammonia and magnesium hydroxide.

The balanced equation for this response is: Mg3N2 (s) +6H20 (1)>3Mg(OH)2 (aq) +2NH3 (aq) If three moles of magnesium nitride react, The response consumes The response produces moles of water moles of magnesium hydroxide and moles of ammonia.

The balanced equation is Mg3N2 (s) +6H20 (1)>3Mg(OH)2 (aq) +2NH3 (aq) is  6:1:3:2 the reaction.

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Answer: It is possible that the seller's claims about the bone being a genuine dinosaur bone and being 400 million years old are true. However, without additional evidence or verification from independent scientists, it is also possible that the bone is not authentic or that the carbon dating results have been manipulated or misinterpreted. It is important to be skeptical and to conduct further research before making a decision about the authenticity of the bone. Additionally, it is important to consider the source of the bone and the seller's reputation and credentials. It would be wise to seek out additional opinions from experts in the field before making a decision about the authenticity of the bone.

The purpose of adding saturated NaCl to a separatory funnel is to enhance the separation of two immiscible layers, typically an aqueous layer and an organic layer, by increasing the polarity difference between the layers and decreasing the solubility of the organic layer in water.

This process is also known as "salting out."
Explanation :
Example:

Imagine you have a mixture containing a water-soluble compound and an organic-soluble compound. You add this mixture to a separatory funnel and then add an organic solvent.

The two layers do not mix well, but some of the organic compound may still dissolve in the water layer. By adding saturated NaCl, the salt ions interact more with water molecules, making the aqueous layer more polar and the organic layer less soluble in water. This results in a better separation of the two layers, allowing you to collect the organic layer containing your desired organic compound with less contamination from the aqueous layer.

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Answer:

protists

animals

fungi

plants

Explanation:

i took the test let me know if im wrong tho

The biotic factors from the following options are protist, animals, fungi, and plants. Options A, B, c, and D are correct.

Biotic factors are those factors which can grow, and reproduce themselves.

Plants, animals, protists, and fungi are biotic factors that live, eat ad reproduce.

Salinity is the quality of any solution. It is not a biotic factor.

Thus, the correct options are A, B, c, and D.

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Answer:

865 kg/m³; 0865 g/cm³

Explanation:

Answer:

Ca₃N₂

Explanation:

The empirical formula is the simplest whole-number ratio between moles of each element present in a molecule.

Thus, we need to convert mass of each atom to moles and find the ratio between these as follows:

Moles N:

1.46g * (1mol / 14.0067g) = 0.104moles

Moles Ca:

6.27g * (1mol / 40.078g) = 0.156moles

The ratio between Moles N and moles of Ca is:

0.156moles / 0.104 moles = 1.5

That means there are 1.5 moles of Ca per mole of N. As empirical formula must be given in whole numbers:

There are 3 moles of Ca per 2 moles of N.

Empirical formula is:

When the dry ingredients of a cake are combined, the result is a mixture. Option 3.

In chemistry, mixtures are substances that are obtained by mixing two or more chemically different substances together with each substance maintaining its chemical identity. In other words, the components of a mixture are still chemically unique and can be separated by physical means.

Mixtures can be homogeneous or heterogeneous. Homogenous mixtures are mixtures in which the components are uniformly dispersed throughout the entire mixture. For heterogeneous mixtures, the components are not uniform throughout the mixture.

Thus, when the dry ingredients of a cake, such as flour, sugar, etc., are combined, what we are going to have is a mixture. Whether this mixture would be homogenous or heterogeneous will depend on the level of mixing. Whatever the case may be, the components can still be separated by physical means.

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Using the equation outlined in this video for conversion of ppm to mg/m³, 1 ppmv of oxygen gas, O2, at 2 atm and 0°C is equal to 2.85 mg/m³.

The conversion of ppm to mg/m³ for a gas can be done using the following equation:

mg/m³ = (ppm) x (molecular weight) x (density of gas at standard temperature and pressure (STP)) / (10^6)

For oxygen gas (O2), molecular weight = 32 g/mol and density at STP = 1.429 kg/m³.

So, 1 ppmv of O2 at 2 atm and 0°C is equal to:

mg/m³ = (1 ppm) x (32 g/mol) x (1.429 kg/m³) / (10^6) = 2.85 mg/m³

Therefore, the answer is B. 2.85 mg/m³.

Using the equation outlined in this video for conversion of ppm to mg/m³, 1 ppmv of oxygen gas, O2, at 2 atm and 0°C is equal to 2.85 mg/m³.

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Answer:

0.0111 M

Explanation:

pH = 4.5

[H3O+] = ?

Relationship between both quantitiesis given by:

pH = -log₁₀ [H3O+]

-pH = log₁₀ [H3O+]

-4.5 =  log₁₀ [H3O+]

[H3O+]  = e ^ (-4.5)

[H3O+] = 0.0111 M

Answer:

B: nuclear energy.

Explanation:

It is emission-free and it saves 2.4 billion tons of carbon emissions per year. Also, the level of hazard of nuclear waste does decrease during the time.

Hope that helps!

The relationship between the phase change and the molecular attraction vs kinetic energy in liquid is comparatively different from that of solids and gas.

The different molecules or ions in liquids are held closely together by an external force, although they are free to move. A liquid can therefore alter its shape to match the object that is holding it. But liquids have a relatively constant volume, just like solids do.

The molecules are always being drawn together by attraction, while being propelled around by kinetic energy. When one of molecular attraction or kinetic energy triumphs in the tug-of-war, a substance changes phase. Since the molecular attraction of each substance is constant, the shift must be in the molecules' kinetic energy.

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Hence, the correct option is D) C5H7O3.

Nicotine is an addictive substance that is found in cigarettes.

The chemical formula for nicotine is C10H14O6.

To determine the empirical formula, one must find the smallest whole-number ratio of the atoms present. For that, we need to divide the subscripts by their greatest common divisor which in this case is 2.

According to the question, the chemical formula of nicotine is C10​H14​O6​.We need to determine its empirical formula.

To do this, we divide each subscript by their greatest common divisor which is 2 in this case.C10H14O6→C5H7O3Therefore, the empirical formula of Nicotine is C5H7O3.

Hence, the correct option is D) C5H7O3.

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The correct way to describe the trend for increasing number of neutrons in the atom is that the number of neutrons increases faster than the number of protons.

The correct option is C.

The neutron is described as a subatomic particle, symbol n or n⁰ , which has a neutral charge, and a mass slightly greater than that of a proton.

The neutron is considered to have a  negative charge both in its inner core and its outer edge, with a positive charge sandwiched in between to make the particle electrically neutral.

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5- perfume sprayed in the air

6- I'm really sorry but I'm not sure

Answer:

Convection

Explanation:

heat rises to the top :)

Answer:

The Answer is Convection

Explanation:

Convection can be caused when liquids or gases touch a hot object and take the heat with them.

Hope I could help!

-Nova

A balanced equation obeys the law of conservation of mass. Here the balanced equation for the decomposition of Barium sulfide is 8 BaS → 8Ba + S₈. The correct option is A.

A chemical equation in which the amount of reactants and products on both sides of the equation are equal is defined as the balanced equation. The number of atoms of each element of the reactants and products are same on either side of the equation.

Here the balanced equation for the decomposition of Barium sulfide is denoted as:

8BaS→ 8Ba + S₈

The number of 'Ba' and 'S' atoms on both sides of the equation are equal.

Thus the correct option is A.

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The products formed during electrolysis of concentrated sodium chloride solution are SODIUM HYDROXIDE and HYDROGEN GAS.

ELECTROLYSIS is the process by which electrolytes allows electric current to pass through it and is decomposed on the process.

CHLORINE is an element which can be produced industrially through the process of electrolysis of brine (concentrated sodium chloride solution). When sodium chloride is dissolved in water, it's ions separate and are capable of conducting electricity.

The products formed during this process includes:

CHLORINE: this is released at the positive electrode during electrolysis. It is used for the following purposes:

SODIUM HYDROXIDE: this remains in the solution during electrolysis. It is used for the following:

HYDROGEN GAS:this is released at the negative electrode during electrolysis. this is used for the following:

Therefore other products during electrolysis of concentrated sodium chloride solution are SODIUM HYDROXIDE and HYDROGEN GAS.

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Answer:

The answer would be 3.25 cm

Explanation:

Not needed.

To calculate the mass of 3.09 × 10^24 atoms of sulfur in grams, we need to utilize the concept of molar mass and Avogadro's number.

First, let's determine the molar mass of sulfur (S). The molar mass represents the mass of one mole of a substance, and it is expressed in grams per mole (g/mol). The atomic mass of sulfur is approximately 32.06 g/mol. This value can be found on the periodic table.

Now, we can calculate the number of moles of sulfur atoms in 3.09 × 10^24 atoms. Since Avogadro's number (6.022 × 10^23) represents the number of atoms in one mole of any substance, we can divide the given number of atoms by Avogadro's number to obtain the number of moles. Let's perform the calculation:

Number of moles = (3.09 × 10^24 atoms) / (6.022 × 10^23 atoms/mol)

= 5.13 moles (rounded to two decimal places)

Finally, we can determine the mass of the sulfur atoms by multiplying the number of moles by the molar mass of sulfur:

Mass of sulfur = Number of moles × Molar mass of sulfur

= 5.13 moles × 32.06 g/mol

= 164.99 grams (rounded to two decimal places)

Therefore, the mass of 3.09 × 10^24 atoms of sulfur is approximately 164.99 grams.

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Answer:

is you'r question correctly?

or not

Answer:

equation number 3 is balanced.

hope it helps ☺️!

Answer:

B.  Na

Explanation:

To identify an atom, you simply need to look at the number of protons.  This atom has 11 protons.  On the periodic table, you can see that the element with 11 protons is sodium (Na).

Answer:

carbon dioxide and oxygen

Answer:What bonding pattern do you observe that you could use to predict whether a compound will be gas at standard temperature and pressure?

The oxidation number of specified element in each compound or polyatomic ion is given below :

i) C in ZnCO3 : +4

ii) Fe in Fe(NO3)2 : +2

iii) Cl in ClF4- : +5

iv) S in S2O3 2- : +2

Simply put, an element's oxidation number is the number assigned to it in a chemical combination. The number of electrons that atoms in a molecule can share, lose, or gain while forming chemical connections with other atoms of a different element is known as the oxidation number.

Oxidation state is another name for oxidation number. However, depending on whether or not we are taking into account the electronegativity of the atoms, these phrases might occasionally have a different meaning. In coordination chemistry, the phrase "oxidation number" is commonly employed.

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The amount of calcium ingested by drinking eight 8-oz glasses of local water is 0.0041655 mol. By drinking 1.0L of local water, approximately 166.85 mg of calcium is ingested, which is 14.5% of the daily requirement of calcium.

1. To calculate the amount of calcium ingested by drinking eight 8-oz glasses of local water, we need to know the volume of water and the concentration of calcium ions present in it.1 oz = 29.57mL

So, eight 8-oz glasses of water = 8 x 8 oz = 64 oz= 64 x 29.57 mL = 1892.48 mL1 L = 1000 mL

Therefore, the volume of water in liters = 1892.48/1000 = 1.8925 L

Concentration of Ca ions in water = 0.0022 mol/L

So, the amount of calcium ingested = concentration of calcium x volume of water= 0.0022 mol/L x 1.8925 L= 0.0041655 mol of calcium

2. To calculate the percentage of the daily requirement of calcium met by drinking 1.0L of local water, we need to convert the amount of calcium in moles to milligrams (mg). The molar mass of calcium is 40.08 g/mol.0.0041655 mol of calcium weighs = 0.0041655 mol x 40.08 g/mol = 0.16685464 g or 166.85 mg

The percentage of the daily requirement of calcium met by drinking 1.0L of local water is given by the formula:

Percentage of daily requirement met = (amount of calcium in water/daily requirement of calcium) x 100%Daily requirement of calcium = 1150 mg

Percentage of daily requirement met = (166.85 mg/1150 mg) x 100%≈ 14.5 %

Therefore, by drinking 1.0L of local water, approximately 166.85 mg of calcium is ingested, which is 14.5% of the daily requirement of calcium.

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Answer:

The number of moles and mass of the sample of argon occupying 37.8L at STP​ are 1.6875 moles and 67.41 grams respectively.

Explanation:

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

Then you can apply the following rule of three: if by definition of STP 22.4 L are occupied by 1 mole of Ar, 37.8 L of Ar are occupied by how many moles?

\(amount of moles=\frac{37.8 L* 1 mole}{22.4 L}\)

amount of moles= 1.6875 moles

The atomic weight of Ar is 39.948 g/mol. So the mass of the sample of argon can be calculated as:

1.6875 moles* 39.948 \(\frac{g}{mol}\) = 67.41 grams

The number of moles and mass of the sample of argon occupying 37.8L at STP​ are 1.6875 moles and 67.41 grams respectively.