What is the temperature of a bunsen burner flame? _______________. chemicals in the eyes are washed out with the eyewash station located at

Answer:

Heated copper metal reacts with oxygen to form the black copper oxide. The copper oxide can then react with the hydrogen gas to form the copper metal and water.

Answer:

answer-COMPOUND COPPER OXIDE

The glass stopper of a reagent bottle should never be placed directly on the laboratory bench for the following reasons. First, the stopper may become contaminated which could possibly contaminate the contents inside the reagent bottle. And this can potentially affect the chemical composition of the reagents and caused errors in any of the experimental results. Second, if the stopper is placed on the bench, the possibility that it might be scratched or damaged is feasible which eventually causes leaks and damage to the reagent bottle. Lastly, it might accidentally be knocked onto the floor potentially causing damage to the stopper and hazards inside the laboratory. Therefore, in order to ensure safety and accuracy during reagent preparation, it is important to always keep the stopper clean and free from contamination by avoiding placing it directly on the laboratory bench. #SPJ11

Tenacity refers to a mineral's toughness or resistance to breaking or being deformed.

The equilibrium vapor pressure with respect to water (eow) is 259.9 Pa. assume that saturation vapor pressure is same as equilibrium vapor pressure.

Therefore, the RH at the frost point is  

RH = (eow / saturation vapor pressure) × 100

= (259.9 Pa / 259.9 Pa) × 100

= 100%

b) At T = -11 °C, we need to compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi) to determine if ice particles will form. From the given table, at T = -11 °C, the equilibrium vapor pressure with respect to water (eow) is 237.7 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 165.3 Pa.

The air is supersaturated with respect to ice, and the presence of Kaolinite particles can provide surfaces for water droplets to condense onto, leading to the formation of ice particles.

c) At T = -12 °C, we compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi). From the given table, at T = -12 °C, the equilibrium vapor pressure with respect to water (eow) is 217.3 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 181.2 Pa.

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Hence, the maximum amount if potassium chloride or oxygen that can be generated when 71.7 grammes of potassium chlorate is broken down is 71.7 grammes.

Because each molecule is composed of two oxygens fused together, its formula is written as O2.

25.4 grams of potassium chloride

46.3 grams of oxygen.

All living organisms require oxygen, a gas that has no color, taste, or odor. It is absorbed by animals, transformed into carbon dioxide by plants, and returned to the atmosphere by plants..What is oxygen O or O2? is a singular oxygen atom. O2 is a molecule made of two oxygen molecules. Our atmosphere is made of mostly O2, which our bodies have evolved to breathe.

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On top of a mountain, separating the plungers would be simpler than at sea level.

a. When rubber plungers are pressed together, it becomes difficult to separate them because of a phenomenon known as adhesion. Adhesion is the molecular attraction between different substances that are in contact with each other.

b. It would be easier to separate the rubber plungers on top of a mountain because the atmospheric pressure is lower at higher altitudes. Atmospheric pressure is the force per unit area exerted by the weight of air molecules in the atmosphere.

c. The reason it would be easier to separate the rubber plungers on top of a mountain is that atmospheric pressure affects the strength of the molecular bonds between the surfaces of the plungers.

When the plungers are under atmospheric pressure at sea level, the molecules on their surfaces are pushed together with great force, and the bonds between them become stronger.

When the plungers are taken to higher altitudes, there is less atmospheric pressure pushing the molecules together, and the bonds between them become weaker.

Therefore, it would be easier to separate the plungers on top of a mountain than at sea level.

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The intermolecular forces between the petroleum molecules are stronger than the forces between water molecules and petroleum molecules. Therefore, petroleum is insoluble in water.

Molecular solids are composed of molecules held together by intermolecular forces, such as van der Waals forces, hydrogen bonding, and dipole-dipole interactions. The solubility of a molecular solid in water depends on the strength and polarity of these intermolecular forces relative to the interactions between water molecules.

For example, sugar and ethyl alcohol are polar compounds with hydrogen bonding and dipole-dipole interactions that can form favorable interactions with water molecules. Water molecules can surround and solvate the sugar or alcohol molecules, breaking their intermolecular bonds and allowing them to dissolve.

In contrast, petroleum is a nonpolar compound with weak van der Waals forces between its molecules. Water molecules, which are polar, cannot solvate the nonpolar petroleum molecules.

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Answer:

alleles

Explanation:

Answer:

ghbdjdbdhdbdbdndjfbfnfnfjfbfjskssks

ijdij

Explanation:

jsjj

Mass of \( \bf H_2SO_4\) is 25 g and we are asked to find number of molecules present in 25 g of \( \bf H_2SO_4\)

\(\qquad\)\( \pink{\bf\longrightarrow { Molar \:mass \:of \:H_2SO_4:-} }\)

\(\qquad\)\( \bf \longrightarrow 1\times2 +32 +16\times 4 \)

\(\qquad\)\( \bf \longrightarrow 98\)

\(\qquad\)____________________

Let's calculate the number of moles present in 25 g of \( \bf H_2SO_4\)

\(\qquad\)\( \purple{\bf\longrightarrow { No \:of \:moles = \dfrac{Given \:mass}{Molar\: mass}}}\)

\(\qquad\)\( \bf \longrightarrow \dfrac{25}{98}\)

\(\qquad\)\( \bf\longrightarrow 0.2551\: moles\)

We know –

Number of molecules:-

\(\qquad\)\( \purple{\bf \longrightarrow No \: of \: moles \times Avogadro \: number}\)

\(\qquad\)\( \bf \longrightarrow 0.2551×6.022×10²³\)

\(\qquad\)\( \bf \longrightarrow 1.54 \times 10^{23}\)

.

\(\qquad\)____________________

Taking into account the definition of Avogadro's number and molar mass, 1.5359×10²³ molecules are in 25 g of H₂SO₄.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound H₂SO₄ is calculated as:

H₂SO₄= 2× 1 g/mole + 32 g/mole + 4× 16 g/mole=

Solving:

H₂SO₄= 98 g/mole

You can apply the following rule of three: if 98 grams of the compound are contained in 1 mole, 25 grams are contained in how many moles?

\(amount of moles= \frac{25 gramsx1 mole}{98 grams}\)

amount of moles= 0.255 moles

25 grams are contained in 0.255 moles of H₂SO₄.

Finally you can apply the following rule of three, taking into account the Avogadro's Number: If 1 mole of the compound contains 6.023×10²³ molecules, 0.255 mole of the compound contains how many molecules?

amount of molecules= (6.023×10²³ molecules × 0.255 mole)÷ 1 mole

amount of molecules= 1.5359×10²³

Finally, 1.5359×10²³ molecules are in 25 g of H₂SO₄.

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Avogadro's Number:

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Molar mass:

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A change in the nucleus of an atom that converts the atom from one element to another one is called a nuclear reaction.

A nuclear reaction is a process that occurs when atomic nuclei undergo a spontaneous transformation or rearrangement. When a nucleus undergoes a nuclear reaction, it may either break down or join with another nucleus. As a result, the atom transforms into another element, changing its number of protons and therefore the identity of the element.

During a nuclear reaction, the atomic nucleus of an atom can be altered. Radioactive decay is a common example of this sort of nuclear reaction. The nucleus of an atom may be exposed to various forms of energy, such as heat or electromagnetic radiation, causing it to transform into another element.

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Answer:

a) 1.567 x 10^9

b) 2.36 x 10^(-5)

Answer: C, 0

Explanation: just a mere guess

Answer:

Coloroplasts I hope it's right ❤️

Answer:

18 g H2O

explanation:

(1 mol O atoms)/16.00 g

= 16.00 g

1 mol O

Answer:

4 sun , planet, moon are the components in the correct order

Answer:

27.2 kg

Explanation:

13.6 * 2 L of commercial flask of mercury = 27.2 kg.

Hope this helps! Have a good day! :D

Answer:

calculate the formulae mass of mgs04 (c=12, fe=56, mg =24,s=32,0=16

In the molecule, CH₂NOH, the hybridization states of the carbon (C), nitrogen (N), and oxygen (O) atoms can be determined based on the number of sigma bonds and lone pairs around each atom. From this, the hybridization of Carbon (C) is sp³, the hybridization of Nitrogen (N) is sp² and the hybridization of oxygen is sp³ hybridized

Carbon (C): In CH₂NOH, the carbon atom is bonded to two hydrogen atoms and one oxygen atom. It also has one lone pair of electrons. Therefore, the carbon atom is sp³ hybridized.

Nitrogen (N): The nitrogen atom in CH₂NOH is bonded to one carbon atom and has two lone pairs of electrons. Hence, the nitrogen atom is sp² hybridized.

Oxygen (O): The oxygen atom in CH₂NOH is bonded to one carbon atom and one hydrogen atom. It also has two lone pairs of electrons. Thus, the oxygen atom is sp³ hybridized.

Hence, the hybridization of all the elements is given above.

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Answer:

see explanation

Explanation:

4. Write the electronic configuration of first 20 elements in the periodic table.

1s1

1s2

1s22s1

1s22s2

1s22s22p1

1s22s22p2

1s22s22p3

1s22s22p4

1s22s22p5

1s22s22p6

1s22s22p63s1

1s22s22p63s2

1s22s22p63s23p1

1s22s22p63s23p2

1s22s22p63s23p3

1s22s22p63s23p4

1s22s22p63s23p5

1s22s22p63s23p6

1s22s22p63s23p64s1

1s22s22p63s23p64s2

Answer:750 mL

Explanation:

volume=3x250 cm^3 = 750 cm^3

750 cm^3 x 1mL/1cm^3 =750 mL

If the volume of a beaker is 250 cm. The amount of water that three beakers can hold is equal to 750 mL.

Volume may be defined as the amount of space that is significantly occupied by a three-dimensional figure or object. It is measured in cubic units.

According to the question,

The volume of a beaker is = 250 cm.

It is known that 1 milliliter is exactly the same as 1 cm.

∴ The amount of water three beakers can hold = 250 × 3 = 750 mL.

Therefore, if the volume of a beaker is 250 cm. The amount of water that three beakers can hold is equal to 750 mL.

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Answer:

The nucleus consists of 9 protons and 10 neutrons.  Nine electrons occupy available electron shells.

The pH of the solution can be found using the formula pH = -log[H3O+]. So, in this case, pH = -log(1.8×10^-5) = 4.74. Since the pH is less than 7, the solution is considered acidic.

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Answer: Crocodile is a reptile whereas sheep and gorilla are the mammals.

Explanation:

Crocodile, sheep, and gorilla have alimentary canal in their digestive system. The urea is the common excretory waste.

Mouth is typically large in case of crocodile and comparatively small in sheep and gorilla.

In crocodile more sharp teeth are present as compared to sheep and gorilla for mastication of food and capturing the prey like fish or large animals like zebra.

The crocodile palate is more stronger than sheep and gorilla because it enable it to chew the bones of the prey.

Answer:

a. 0.02 moles  of NH₃, 0 moles of O₂, 0.08 moles of NO, 0.12 moles of H₂O

b. \(P_{NH_3}\) = 12,576.5 Pa, \(P_{NO}\) = 50,306.05 Pa, \(P_{H_2O}\) =  74,459.1 Pa

c. The total pressure is 138,341.64 Pa

Explanation:

a. NH₃ + O₂  → NO + H₂O

The balanced chemical equation is first found to be

4NH₃ + 5O₂  → 4NO + 6H₂O

Therefore, we have;

4 moles of NH₃ reacts with 5 moles of O₂ to form 4 moles of NO and 6 moles H₂O

Dividing by the reactant with the highest number of moles which is 5 moles of oxygen gives;

4/5 moles  of NH₃ reacts with 5/5 moles of O₂ to form 4/5 moles of NO and 6/5 moles H₂O

Which is the same as 4/5 moles  of NH₃ reacts with 1 mole of O₂ to form 4/5 moles of NO and 6/5 moles H₂O

Multiplying by 0.100 gives;

0.1×4/5 moles  of NH₃ reacts with 0.1 mole of O₂ to form 0.1×4/5 moles of NO and 0.1×6/5 moles H₂O

The quantity of each gas in the container upon completion of the reaction is therefore;

(0.1 - 0.1×4/5) = 0.02 moles  of NH₃

0 moles of O₂

0.08 moles of NO

0.12 moles H₂O

b. Given that the temperature = 105°C, we have;

PV = nRT

P = nRT/V

Where:

n = Total number of moles = 0.02 + 0.08 + 0.12 = 0.22 moles

R = Universal gas constant = 8.3145 J/(mol·K)

T = Temperature = 105°C = 378.15 K

V = Volume = 5 litre = 0.005 m³

P = 0.22×8.3145×378.15/0.005 = 138,341.64 Pa

From Dalton's law of partial pressure, we have;

Partial pressure Pₓ = Xₓ × P

Where:

Xₓ = Mole fraction

Which gives for ammonia NH₃ with 0.02 moles;

Mole fraction = 0.02/0.22 = 1/11

\(P_{NH_3}\) = 1/11 × 138,341.64  = 12,576.5 Pa

For the 0.08 moles of NO, we have

Mole fraction = 0.08/0.22 = 4/11

\(P_{NO}\) = 4/11 × 138,341.64  = 50,306.05 Pa

For the 0.12 moles H₂O

P = 0.12×8.3145×378.15/0.005 = 74,459.1 Pa

Mole fraction = 0.12/0.22 = 6/11

\(P_{H_2O}\) = 6/11 × 138,341.64  = 74,459.1 Pa

c. The total pressure = 12,576.5 Pa + 50,306.05 Pa + 74,459.1 Pa = 138,341.64 Pa.

The caf2 is produced when calcium reacts with fluorine in a synthesis reaction.

What is reaction ?

When one or more chemicals, known as reactants, are changed into one or more new compounds, known as products, a chemical reaction has taken place. Substances are made of chemical constituents or compounds.

What is calcium ?

Among the alkaline-earth metals in Group 2 (IIa) of the periodic table is calcium (Ca), an element with chemical symbol Ca. The human body has the most of this metallic element, and the Earth's crust contains the fifth-highest amount of it.

Therefore, caf2 is produced when calcium reacts with fluorine in a synthesis reaction.

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A 30-day supply of Levoxyl at a dosage of one 13 μg tablet per day contains 0.39 mg of Levoxyl.

For a patient taking one 13 μg tablet of Levoxyl per day, the total amount of levothyroxine they are receiving is 13 micrograms. To calculate the total amount in a 30-day supply, we simply multiply this amount by 30.

13 μg/tablet x 1 tablet/day x 30 days = 390 μg

Note that the microgram (μg) is a unit of mass equal to one millionth of a gram, while the milligram (mg) is a unit of mass equal to one thousandth of a gram. To convert μg to mg, we divide by 1000:

390 μg / 1000 = 0.39 mg

Levoxyl is a medication used to treat hypothyroidism, a condition where the thyroid gland doesn't produce enough hormones to regulate the body's metabolism. The active ingredient in Levoxyl is levothyroxine sodium, which is a synthetic form of the hormone thyroxine (T4).

Levoxyl tablets are available in several strengths, ranging from 25 mcg to 300 mcg. The recommended dosage depends on the patient's age, weight, and the severity of their hypothyroidism. In general, adults with normal thyroid function usually require about 1.6 mcg of levothyroxine per kilogram of body weight per day.

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Answer:

The IUPAC structure only shows bond pairs and lone pairs. In the flouromethane structure above, there is only one bond pair and three lone pairs of electrons. Therefore there is one electron remaining, but since it doesn't not make up a pair, it is ignored in the structure but theoretically it is present.

\(.\)

Answer:

therefore there is one electron remaining , but since it doesn't make up a pair . It is ignored in the structure but theoretically it is present .

Answer:

It is B Metalloids

Explanation:

Because Metalloids are f orbitals

Answer:

b. Metalloids according to modern period table and respective elements.