Which of the following structures represents a lipid?
A monomer made up of a nitrogenous base, a five carbon sugar, and a phosphate group bonded together.
A monomer with an amino group, carboxylic acid, hydrogen atom, and R group bonded to a central carbon atom.
A monomer with the formula C6H12O6. Five carbon atoms and one oxygen atom form a hexagonal ring, with the other atoms bonded to that ring.
A molecule made up of four carbon rings with other atoms bonded to those rings.

No, carbon dioxide gas will not evolve when sodium bicarbonate is added to an aqueous solution of ethanol.

Sodium bicarbonate (NaHCO3), commonly known as baking soda, is a weak base. When it reacts with an acid, such as acetic acid or citric acid, carbon dioxide gas (CO2) is produced as a byproduct. However, in the given scenario where sodium bicarbonate is added to an aqueous solution of ethanol, which is not acidic, there is no acid present to react with the sodium bicarbonate. As a result, there is no chemical reaction that would release carbon dioxide gas. Therefore, the addition of sodium bicarbonate to an aqueous solution of ethanol would not lead to the evolution of carbon dioxide gas.

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The molecular formula of lactic acid is C₃H₆O₃, if the molecular weight of lactic acid is 90.08 g/mol.

Lactic acid consists of C, H, and O. The carbon in carbon dioxide is from the carbon of lactic acid. The H of H₂O is from lactic acid.

No. of mol of CO₂ =  \(\frac{14.7}{44}\)  mol CO₂ ( the molar mass of CO₂ = 44 g/mol )
No. of mol of C = No. of mol of CO₂ = \(\frac{14.7}{44}\)  mol

Mass of C = ( \(\frac{14.7}{44}\) × 12 ) g C

                = 4.009 g C

No. of mol of H₂O = \(\frac{6.00}{18}\)  mol ( molar mass of H2O = 18 g/mol )

No. of mol of H = 2 No. of mol of H₂O = 2 × \(\frac{6.00}{18}\) mol = \(\frac{12.0}{18}\) mol

Mass of  H = ( \(\frac{12.0}{18}\) × 1 ) g H

                  = 0.6667 g H

mass of O = (10.0 - 4.009 - 0.6667)g = 5.3243 g

No. of moles of O = \(\frac{5.3243}{16}\) mol

So the ratio of C,H,O is

C : H : O = \(\frac{14.7}{44}\) : \(\frac{12.0}{18}\) : \(\frac{5.3243}{16}\)

C : H : O = 0.3341 : 0.6667 : 0.3328

C : H : O = 1 : 2: 1

So the empirical formula for lactic acid is CH₂O.

Let the molecular formula of lactic acid is ( CH₂O )ₓ

So the molecular weight of lactic acid is

( 12 × x ) + ( 2 × x × 1 ) + ( 16 × x ) = 90.08

                             12x + 2x +16x = 90.08

                                             30x = 90.08

                                                  x ≈ 3

So the molecular formula of lactic acid is ( CH₂O )₃ = C₃H₆O₃

Thus, C₃H₆O₃ is the molecular formula of lactic acid.

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Answer:

false galaxies are much larger in size

Answer:

54

Explanation:

Since in a neutral atom the atomic number is equal to the number of electrons which is ewual to the number of protons

Answer:

Xenon

Explanation:

Since they are giving you the amount of protons in the atom, with that you know what element it is. Protons indicate the atomic number of the element.

In this case, since we have 54 protons, our atomic number is 54 which is Xenon.

Answer:

Methane -1,Ethene 2 , Ethane 2,Pentane 5,Propene 3,Hexane 6,Ethyne 2,Propane 3,Octane 8,Heptane 7 Decane 10,Butyne 4,Butane 4,Propyne 3,Butene 4

Answer:

Methane: 1

Ethane: 2

Ethene: 2

Pentane: 5

Propene: 3

Hexane: 6

Ethyne: 2

Propane: 3

Hexane: 7

Octane: 8

Decane: 10

Butyne: 4

Butane: 4

Propyne: 3

Butene: 4

Explanation:

Use the chemical formula of the compounds:

Methane ⇒ \(CO_4\)             Hexane ⇒ \(C_6H_14\)        Decane ⇒  \(C_10H_22\)

Ethane ⇒ \(C_2H_6\)                Ethyne ⇒ \(C_2H_2\)          Butyne ⇒ \(C_4H_6\)

Ethene ⇒ \(C_2H_4\)             Propane ⇒ \(C_3H_8\)         Butane ⇒ \(C_4H_10\)

Pentane ⇒ \(C_5H_12\)             Hexane ⇒ \(C_7H_16\)      Propyne ⇒ \(C_3H_4\)

Propene ⇒ \(C_3H_6\)           Octane ⇒ \(C_8H_18\)            Butene ⇒ \(C_4H_8\)

In the chemical formulas above, each formula has things known as coefficients (elements) and subscripts (atoms).

So to further explain, take methane as an example, there is a "C" at the beginning. C is capital as it is a pure substance and is a element. This also means there is 1 carbon atom in methane while there is 4 oxygen atoms. But to explain further, let's review definitions:

A pure substance composed of two or more elements composed of two or more elements.

A pure substance is a single element or compound, not mixed with any other substance

One of a class of substances that cannot be separated into simpler substances by chemical means.

A chemical formula that indicates the kinds of atoms and the number of each kind in a molecule of a compound.

So after reviewing let's find the carbon atoms.

The subscripts in each chemical formula that are to the right to the "C" are the amount of carbon atoms. If a capital letter does not have a subscript, it is assumed to have 1 atom only.

Your answers can be found above.

The substance that was NOT part of the mixture used in the Urey-Miller experiments is: C. carbon dioxide

The Urey-Miller experiments, conducted in 1952 by Stanley Miller and Harold Urey, aimed to simulate the conditions of early Earth's atmosphere and investigate the formation of organic compounds. The experiments involved creating a mixture of gases thought to be present in the early Earth's atmosphere and subjecting them to electrical discharges to simulate lightning. The purpose was to see if these conditions could produce organic molecules, such as amino acids. The mixture used in the Urey-Miller experiments typically consisted of water (A), hydrogen gas (B), ammonia (D), and methane (E). Carbon dioxide (C) was not part of the original mixture used in these experiments.

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Answer:

A mirror fog doesn’t fog up from a far distance because it does not have the circumstances to fog up. It must be at the same distance.

The fog in the mirror is the condensation of water vapor as it touches a colder surface. By running cold water you just cool down the bath tub and everything around it. Now the vapor coming from the hot shower will mostly condense right there and will not reach the mirror.

Answer:

B) 4.152 x 10^5

Explanation:

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10. If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.

The main answer to the question is: The test statistic is 51.20 and the critical values are 9.591 and 34.170.

To explain the main answer, we are conducting a hypothesis test to determine if the population standard deviation of the pH of rain is indeed 0.5, as suggested by the theory. The null hypothesis (H0) is that the population standard deviation is 0.5, while the alternative hypothesis (H1) is that the population standard deviation is not 0.5.

In this case, we are given a random sample of 21 rainy days, and the sample standard deviation is 0.8. To test the hypothesis, we need to calculate the test statistic, which is given by the formula: test statistic = [(sample standard deviation) - (hypothesized standard deviation)] / (sample standard deviation / sqrt(sample size)).

Plugging in the values, we get: test statistic = [(0.8 - 0.5) / (0.8 / sqrt(21))] = 51.20.

To determine the critical values, we need to look at the critical region associated with the given significance level (alpha) of 0.05. Since this is a two-tailed test, we divide the significance level by 2, resulting in an alpha of 0.025 for each tail. Using the degrees of freedom (n-1), which is 20 in this case, we can consult the t-distribution table or use a statistical software to find the critical t-values. For an alpha of 0.025 and 20 degrees of freedom, the critical t-values are approximately ±2.093.

Converting the t-values to critical values using the formula: critical value = (hypothesized standard deviation) + (t-value * (sample standard deviation / sqrt(sample size))), we get: critical values = 0.5 + (2.093 * (0.8 / sqrt(21))) = 9.591 and 0.5 - (2.093 * (0.8 / sqrt(21))) = 34.170.

Therefore, the correct answer is: The test statistic is 51.20 and the critical values are 9.591 and 34.170.

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To determine the number of grams of element "f" needed to react with 2.30 grams of element "k", you can use the mass ratio provided in the problem. First, let's call the mass of "f" that is needed x. The mass ratio tells us that the mass of "f" is 2.06 times the mass of "k", so we can set up the following equation:

2.06 * x = 2.30

To solve for x, we can divide both sides of the equation by 2.06:

x = 2.30 / 2.06

This simplifies to:

x = 1.12 grams

Therefore, 1.12 grams of element "f" are needed to react with 2.30 grams of element "k".

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Answer:

i think 1

Explanation:

srry if its wrong

If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

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The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

Ambos son ejemplos de procesos de transformación de la energía.

El ejemplo del aerogenerador transforma la energía cinética traslacional del viento en energía cinética rotacional del aerogenerador y pérdidas debido a la fricción, la cual es en forma de calor.

En cambio, el ejemplo del hervido del agua es el ingreso de calor por la combustión de madera para aumentar su energía interna.

Explanation:

Son ejemplos de procesos de transformación de energía, por el Principio de Conservación de la Energía se sabe que la energía total de un sistema no se crea ni se destruye, solo se conserva.

El ejemplo del aerogenerador transforma la energía cinética traslacional del viento en energía cinética rotacional del aerogenerador y pérdidas debido a la fricción, la cual es en forma de calor.

En cambio, el ejemplo del hervido del agua es el ingreso de calor por la combustión de madera para aumentar su energía interna.

Answer: 2.5 grams

Explanation:

Expression for rate law for first order kinetics is given by:

\(t=\frac{2.303}{k}\log\frac{a}{a-x}\)

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process  

a) to calculate the rate constant:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

\(t_{\frac{1}{2}}=\frac{0.693}{k}\)

\(k=\frac{0.693}{2years}=0.346years^{-1}\)

b) to find amount left after 4 years

\(4=\frac{2.303}{0.346}\log\frac{10}{a-x}\)

\((a-x)=2.5g\)

Thus 2.5 g of cesium would remain from a 10 g sample after 4 years

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Answer:

Hypothesis is a statement of expectation or prediction that will be tested by research

Answer:

I don't speak spanish srry

Explanation:

Answer:

A. The rate of the reverse reaction increases with an increase in the concentration of CaCO3(s)

Explanation:

If the concentration of a reactant has increased, The substance will shift in the direction of the reaction that uses the reactants, So that the Reactants substance Increases.

Peel the glove away from your body, pulling it inside out. Peel the glove away from your body, Grasp the outside of one glove at the wrist. Do not touch your bare skin.

A chemical is any substance that has a defined composition.

Steps to remove gloves:

Grasp the palm of one glove near your wrist. Carefully pull the glove off, turning it inside out.

Hold the glove in the palm of the still-gloved hand. ...

Pull the glove until it comes off inside out. ...

Always wash your hands after removing gloves and before touching any objects or surfaces.

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To solve this problem, let's write out the equation of reaction

\(Li_2O + H_2O \to 2LiOH\)

The pH of a solution indicates it's level of acidity. But in this question, lithium oxide dissolves in water to produce lithium hydroxide.

We can calculate the acidity of the solution by;

The numbers of moles is

\(n = \frac{mass}{molar mass}\\n = \frac{2.6}{30}\\n = 0.086 moles\)

1 mole of Li2O produce 2 moles LiOH

0.086 moles of H2O will give

\(2 * 0.086 moles = 0.173 moles of LiOH\)

The molarity of LiOH

\(n = \frac{moles}{volume} = \frac{0.173}{1.70} = 0.102M\)

Since we have the pOH of the solution, let's calculate the pH of the solution

\(pH + pOH = 14\\pH = 14 - pOH\\pOH = 0.99\\pH = 14 - 0.99 = 13.009\)

The pH of the solution is equal to 13.0

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Answer: acetone

Explanation: Acetone has the weakest intermolecular forces, so it evaporated most quickly. Water had the strongest intermolecular forces and evaporated most slowly.

Precautions need to be observed when using methanol and a flame are wearing a mask and gloves, performing experiment from a distance and in a careful and safe way.

Methanol burns with a clear, clean flame which is dangerous if not carried properly. Wearing a mask and gloves during experiment in order to safe the hands and face from burning.

Performing experiment from a distance and in a carful way avoids the chances of accident so we can conclude that wearing a mask and gloves, performing experiment from a distance and in a careful and safe way are the precautions are needed.

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For a weak acid, the \(pk_a\) value is an intrinsic property of the molecule and depends on how tightly bound the \([H^+]\) is.

In chemistry, an intrinsic property is a property of a substance that is independent of the amount of the substance present. Such properties are mainly dependent on chemical composition and structure.

The \(pk_a\) value is the negative base 10 logarithm of the acid dissociation constant (\(k_a\)) of a solution.

\(pk_a=-log_{10}(k_a)\).

As the acid dissociation constant (\(k_a\)) of a solution is an intrinsic property, hence the \(pk_a\) value is also an intrinsic property.

The acid dissociation constant (\(k_a\)) of a solution depends on the fact that if the acidic hydrogen \([H^+]\) is tightly bounded, then the value of \(k_a\) will be decreased, which leads to the increase in the value of \(pk_a\).

Hence, for a weak acid, the \(pk_a\) value is an intrinsic property of the molecule and depends on how tightly bound the \([H^+]\) is.

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ACID (Atomicity, Consistency, Isolation, Durability) is a set of properties that ensure reliable data transactions in a database management system.

ACID transactions are essential for ensuring the reliability of data in a database management system and are particularly important for mission-critical applications where data integrity is a top priority.

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Answer:Agi

+

kno3

Explanation:

Explanation:

When we have direct sunlight, the temperature is higher compared to indirect sunlight.

Direct sunlight is usually overhead whereas indirect sunlight is at an angle to the surface.

At the threshold value of a neuron, voltage-gated sodium (Na+) channels open. The threshold value of a neuron is the critical level of depolarization that must be reached in order for an action potential to be generated. When this threshold value is reached, it causes voltage-gated sodium (Na+) channels in the neuron's membrane to open.

This allows sodium ions to flow into the neuron, causing further depolarization and leading to the generation of an action potential.Voltage-gated potassium (K+) channels also play a role in the generation of action potentials. However, these channels do not open at the threshold value of a neuron.

Instead, they open later in the action potential, allowing potassium ions to flow out of the neuron and repolarize the membrane. Chemically-gated sodium (Na+) channels are also involved in the generation of action potentials, but these channels are not voltage-gated and are not involved in the threshold value of a neuron.

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