Which of the following elements is a liquid at room temperature? A. Bromine (Br) B. Carbon (C) C. Calcium (Ca) D. Helium (He)

Answer:

People show more interest in personal broadcasting.

Explanation:

The art of oration (speaking) is being  replaced by personal broadcasting mean now people used webcam or camcorder for creating its own content and transmit it to other people through internet. Personal broadcasting provides audio and video to the individual that make it more interesting as compared to oration. People show more interest in personal broadcasting as compared to oration so that's why oration is replaced by personal broadcasting.

Answer: a rock being in one place over a long time and eventually wearing away

Explanation:

:)

The engineers fitted a multiple linear regression model to analyze the effect of variables on the efficiency of the ammonia oxidation process, assessed significance levels, and recommended a final model.

Engineers conducted an investigation on the efficiency of a process that oxidizes ammonia to nitric acid by studying the effect of three variables: Airflow, Water temperature, and Acid concentration.

They collected data on stack loss, which represents the percentage of unabsorbed ammonia escaping from the absorption tower. Using R, they fitted a multiple linear regression model with polynomial terms and interactions for the predictors.

They analyzed the model summary table to determine the mean square error (MSE), R², and adjusted R².

They also assessed the significance of variables/terms at a 0.1 significance level, tested the joint significance of interaction terms, and evaluated the joint significance of quadratic terms.

Based on the results, they recommended a final model containing only significant variables/terms at a significance level of 0.05.

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Answer:

the energy levels and orbitals the electrons are in

Explanation:

i just took the test :)

The energy levels and orbitals the electrons are in. Hence, option D is correct.

An atom contains a central nucleus surrounded by one or more electrons.

The quantum numbers of electrons represent the probable distance of the electron from the nucleus. It refers to the size of the orbital and the energy level an electron is placed in.

Hence, option D is correct.

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The final product beaker for the reaction between nitric acid and strontium hydroxide would contain strontium nitrate and water. [Precipitation] of strontium nitrate would occur, while water would remain in the solution. The beaker may also contain some excess nitric acid if it was not completely neutralized by strontium hydroxide.

When nitric acid (HNO3) reacts with strontium hydroxide (Sr(OH)2), a neutralization reaction occurs. The balanced chemical equation for this reaction is:

2HNO3 + Sr(OH)2 -> Sr(NO3)2 + 2H2O

In this reaction, the hydrogen ions (H+) from nitric acid react with the hydroxide ions (OH-) from strontium hydroxide to form water (H2O). The remaining components, strontium ions (Sr2+) and nitrate ions (NO3-), combine to form strontium nitrate (Sr(NO3)2), which is a soluble salt.

In the final product beaker, the strontium nitrate would be in the form of dissolved ions since it is soluble in water. Water would be present in the solution as the solvent. If there was any excess nitric acid that was not completely neutralized, it would also be present in the beaker.

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Question id : 33544103

Answer:

To calculate the maximum β-energy in the decay of carbon-14 (14C) to nitrogen-14 (14N), we need to use the mass difference between the initial and final nuclei. The β-decay process involves the conversion of a neutron into a proton, emitting a β-particle (electron) and an electron antineutrino.

The mass difference (∆m) between 14C and 14N is given by:

∆m = mass(14C) - mass(14N)

= 14.003241u - 14.003074u

= 0.000167u

The β-energy (Eβ) is related to the mass difference (∆m) by Einstein's mass-energy equivalence equation: E = ∆mc^2, where c is the speed of light.

Eβ = ∆m * c^2

Now, we need to convert the mass difference (∆m) from unified atomic mass units (u) to kilograms (kg) before using it in the equation. The conversion factor is approximately 1.66053906660 × 10^−27 kg/u.

∆m_kg = ∆m * (1.66053906660 × 10^−27 kg/u)

Next, we'll calculate the β-energy by substituting the values into the equation:

Eβ = ∆m_kg * c^2

The speed of light (c) is approximately 2.998 × 10^8 m/s.

Eβ = ∆m_kg * (2.998 × 10^8 m/s)^2

Let's perform the calculations:

∆m_kg = 0.000167u * (1.66053906660 × 10^−27 kg/u)

≈ 2.77273363362 × 10^−29 kg

Eβ = (2.77273363362 × 10^−29 kg) * (2.998 × 10^8 m/s)^2

≈ 2.49344368869 × 10^−13 J

The maximum β-energy in the decay of 14C to 14N is approximately 2.493 × 10^−13 Joules.

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Answer:

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

1.39 × 10²³ particles CuCr₂O₇

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 64.5 g CuCr₂O₇

[Solve] particles CuCr₂O₇

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of Cu - 63.55 g/mol

[PT] Molar Mass of Cr - 52.00 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of CuCr₂O₇ - 63.55 + 2(52.00) + 7(16.00) = 279.55 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.38944 × 10²³ particles CuCr₂O₇ ≈ 1.39 × 10²³ particles CuCr₂O₇

Answer:

The property of water that is described as its ability to act as a universal solvent due to its polar nature and ability to attract other molecules is called "solvent power" or "solubility."

Answer:8

in the respiratory system

a.

Explanation:

Answer:

A push or pull is referred to as a force. Forces can cause objects to move, slow, stop, or change the direction in which they travel. The force of gravity, for example, pulls all objects toward the Earth's center. Every time two things interact, a force is exerted on each of them. When this happens, the two items no longer feel the force after the interaction ends.

Explanation:

Force is that external physical cause which changes or tends to change:

hope this helps you.

Answer:

Paper folding into origami

Explanation:

Answer:

The equilibrium concentration of I₂ is 0.400 M  and HI is 1.20 M, the Keq will be 0.112.

Explanation:

Based on the given information, the equilibrium reaction will be,  

2HI (g) ⇔ H₂ (g) + I₂ (g)

It is given that 4.00 mol of HI was filled in a flask of 2.00 L, thus, the concentration of HI will be,  

= 4.00 mol/2.00 L

= 2.00 mol/L

Based on the reaction, the initial concentration of 2HI is 2.00, H₂ is 0 and I₂ is O. The change in the concentration of 2HI is -x, H₂ is x and I₂ is x. The equilibrium concentration of 2HI will be 0.200-x, H₂ is x and I₂ is x.  

It is given that at equilibrium, the concentration of H₂ or x is 0.400 M.  

Now the equilibrium concentration of HI will be,  

= 2.00 -2x  

= 2.00 - 2 × 0.400

= 1.20 M

The equilibrium concentration of I₂ will be,  

I₂ = x  

= 0.400 M

The equilibrium constant (Keq) will be,  

Keq = [H₂] [I₂] / [HI]²

= (0.400) (0.400) / (1.20)²

= 0.112

Thus, the Keq of the reaction will be 0.112.  

Marathon is a 26.2 mile race that commemorates the run made by a Greek soldier, Pheidippides, that took place in 490 BC. He ran 41.9 kilometers.

The Greek soldier Pheidippides ran marathon of 26.2 miles.

So, the kilometers he ran -

1 mile = 1.6 km

26.2 mile = 1.6 x 26.2 km

                = 41.9 km

Why marathon is 26.2 miles?

Marathon is 26.2 miles long, as, the Queen Alexandra requested the race to be started from the lawn of the Windsor Castle, for the little royals to watch and to finish the race in front of the royal box of Olympic stadium, and the distance between lawn of castle and royal box was 26 miles and 385 yards.

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Answer:

41.9 km

Explanation:

I took the test.

The given statement "radioactive decay in every nuclear reaction always follows the first order reaction kinetics." is true because radioactive decay in every nuclear reaction always follows the first-order reaction kinetics.

Radioactive decay always follows the first order reaction kinetics, which means that the rate of decay is directly proportional to the amount of radioactive substance present. This means that the decay rate will decrease as the amount of radioactive material decreases.

This relationship is expressed by the equation N(t) = N(0) * e^(-λt), where N(t) is the amount of radioactive material remaining at time t, N(0) is the initial amount of radioactive material, e is the mathematical constant, and λ is the decay constant. This equation demonstrates that the rate of decay decreases exponentially over time.

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Answer:

Explanation:

Single replacement

Double replacement

Combustion (and synthesis)

synthesis

Decomposition

Answer:

Explanation:

Find the answer below

If Carbon reacts with an oxygen atom, the product is carbon dioxide. This is expressed as:

Given the following

The Mass of the product will be the sum of the mass of reactants

Mass of CO₂ = Mass of Carbon + mass of Oxygen

Mass of CO₂ = 24 +64

Mass of CO₂ = 90grams

Hence the mass of the reactants is 24grams of carbon and 64grams of oxygen while the mass of the product is 90grams

The data support Law of Conservation of mass

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The answer is A: H₂SO4 + 2LIOH → Li2SO4 + 2H2O

Answer:

H₂SO4 + 2LIOH → Li2SO4 + 2H2O

Explanation:

The balanced equation that represents a neutralization reaction is:

H₂SO4 + 2LIOH → Li2SO4 + 2H2O

This is a neutralization reaction because the acidic hydrogen ions (H+) in sulfuric acid (H₂SO4) react with the basic hydroxide ions (OH-) in lithium hydroxide (LiOH) to form water (H2O) and a salt (Li2SO4). The resulting solution will be neutral as the acid and base have neutralized each other.

The right answer is (C). Ionic compounds are brittle because the layers are held in place by strong attraction forces.

Ionic bonding would typically be found in compounds where a metals is bound to a non-metal or even a semi-metal. Molecules are those contain just non-metals or semi-metals combined with non-metals and display covalent bonding.

The bond between the two hydrogen atoms in a water molecule, which is ionic in nature but has a covalent bond instead, is formed when they place their positive charges on opposite sides of a oxygen atom, that has a negatively charged.

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The Cl-Cl bond will react more readily because it has a lower bond energy than the C- H bond.

The bond energy refers to the energy required to break the bonds that links two atoms together in a molecule. It is equal to the energy that is evolved when the bond is formed.

In comparing the Cl-Cl bond with the C-H bond, we will find out that the Cl-Cl bond will react more readily because it has a lower bond energy than the C- H bond.

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Answer:

As you go down the periodic table, usually atoms get bigger because n gets bigger (there are electrons in higher shells). Effective nuclear charge does get bigger too going down the periodic table, but this effect is smaller than the change in shell.

Explanation:

Answer:

20.1169 Km/hr

Explanation:

10 laps around a 1320-foot track in 12 minutes.

Total distance = 10 * 1320 foot = 13200 foot

Time = 12 minutes

Converting to Kilometers and hour;

1 Foot is equal to 0.0003048 Kilometers;

13200 foot = x kilometer

Total distance = 4.02336 kilometer

Time = 12 / 60 = 0.2 hour

Speed = Distance / Time = 4.02336 / 0.2 = 20.1169 Km/hr

Answer:

chemical change

Explanation:

chemical change is when a substance combine with another substance to form a new substance.

In vivo, most naturally occurring amino acids adopt the L-configuration or the L-stereoisomer. The L-configuration refers to the spatial arrangement of atoms around the central carbon atom (the α-carbon) in the amino acid molecule. In this configuration, the amino group (-NH2) is positioned to the left, and the carboxyl group (-COOH) is positioned to the right when the molecule is drawn in the Fischer projection.

The prevalence of the L-configuration in amino acids can be attributed to the evolutionary history of life on Earth. It is believed that early biochemical processes favored the production of L-amino acids, possibly due to the asymmetry created by certain enzymatic reactions. Over time, this bias toward L-amino acids became dominant in living organisms.

The stereoisomer D-configuration, on the other hand, is less common in naturally occurring amino acids. D-amino acids can be found in certain organisms, such as bacteria, and in special contexts, such as in the cell walls of some bacteria or in peptides produced by non-ribosomal peptide synthesis. However, they are generally rare in proteins found in living systems.

It is important to note that while L-amino acids are predominant in proteins, there are exceptions. For instance, the amino acid glycine lacks a chiral center and is achiral, meaning it does not have a specific L- or D-configuration. Additionally, some non-proteinogenic amino acids, which are not incorporated into proteins, may have different stereochemical configurations.

Overall, the L-configuration is the most commonly observed stereochemical configuration for amino acids in vivo, playing a crucial role in the structure, function, and chemistry of proteins in living organisms.

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The question is mostly solved. The definition of heat is used for this problem which tells us:

Where,

Q is the heat added to the system, 120 J

m is the mass of the metal, 5.0 g

Cp is the specific heat of the metal, 0.385J/g°C

dT is the change of temperature:

T2 is the final temperature, unknown

T1 is the initial temperature, 22°C

We clear the final temperature from the equation:

Now, we replace the known data:

Answer:

The final temperature of the metal will be 84°C

The change in the temperature will be 84°C-22°C=62°C

Milk is not a strong acid or strong base. Milk is slightly acidic . It almost has the range of pH 6.5 to 6.7.

In milk there is lactic acid. Lactic acid is a very weak acid. It is produced by the bacteria that ferment lactose in milk.

The acidity of lactic acid or milk is very mild and not at all strong enough to cause any significant acidic effects.

A strong acid in water completely ionizes the water and gives up the complete H+ ions. pH is actually determined by if the substance donates H+ ions or receives OH- ions.

If substance donates H+ it is acid and if substance receives OH- it is base. If it is acid the pH will be less than 7. If it is base the pH will be above 7. Neutral will be pH 7.

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Saturated fatty acids have higher melting points than unsaturated fatty acids due to their linear structure and stronger intermolecular forces.

Saturated fatty acids have higher melting points than unsaturated fatty acids of the same chain length due to differences in their molecular structures. A saturated fatty acid is composed of straight hydrocarbon chains with only single bonds between carbon atoms, while an unsaturated fatty acid contains one or more double bonds.

The effect of a double bond on the fatty acid structure is significant. The double bond introduces a kink or bend in the hydrocarbon chain, preventing the molecules from packing tightly together. This reduces the intermolecular forces between fatty acid molecules, making it easier for them to overcome these forces and transition from the solid to the liquid phase, resulting in a lower melting point. In contrast, saturated fatty acids can pack closely together due to their linear structure, allowing for stronger intermolecular forces and a higher melting point.

To determine the fatty acid with the higher melting temperature in each pair, we need to consider their structures and the impact of the double bonds:

a. 18:1

In this pair, 18:1 indicates an unsaturated fatty acid with one double bond at the 9th carbon atom. The presence of the double bond introduces a kink in the hydrocarbon chain, reducing the intermolecular forces and lowering the melting temperature compared to the saturated fatty acid 18:0. Therefore, the saturated fatty acid 18:0 has the higher melting temperature.

b. 18:0

Both fatty acids in this pair are saturated. Since they have the same chain length (18 carbons) and no double bonds, their molecular structures are similar. However, the presence of the shorter chain length (16 carbons) in the second fatty acid 16:0 would lead to a slightly lower melting temperature compared to the first fatty acid 18:0. Therefore, the saturated fatty acid 18:0 has the higher melting temperature.

c. 18:0

In this pair, both fatty acids are saturated. Since they have the same chain length (18 carbons) and no double bonds, their molecular structures are identical. Therefore, both fatty acids have the same melting temperature.

In summary, the presence of double bonds in unsaturated fatty acids introduces kinks in the hydrocarbon chain, reducing the intermolecular forces and lowering the melting point.

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