A 2 mL sample of concentration 0.0043 M is measured out with a volumetric pipet and diluted to 100.0 mL. What is the concentration (in M) for this solution? Give your numerical answer to three significant figures and leave off the unit label.

Answer:

1.5 × 10³ g

Explanation:

Step 1: Given and required data

Step 2: Calculate the temperature change

ΔT = 28.5°C - 22.0 °C = 6.5 °C

Step 3: Calculate the mass (m) of water

We will use the following expression.

Q = c × m × ΔT

m = Q / c × ΔT

m = 41,840 J / (4.184 J/g.°C) × 6.5 °C = 1.5 × 10³ g

Answer:

a

Explanation:

it is an electrolyte because of its strong polar chemical bond

Answer:

Explanation:

CuSO₄(aq) + 4NH₃(aq) --> [Cu(NH₃)₄]SO₄(aq)

1 mole of copper sulphate reacts with 4 moles of ammonia

molecular weight of copper sulphate = 17 g

4.3 g of copper sulphate = 4.3 / 17 = .253 moles of copper sulphate

so with .253 moles of copper sulphate will react .253 x 4 = 1.012 moles of ammonia.

The number of moles of ammonia i.e. needed is 1.012 moles.

The following chemical equation should be considered.

CuSO₄(aq) + 4NH₃(aq) --> [Cu(NH₃)₄]SO₄(aq)

It means that 1 mole of copper sulfate reacts with 4 moles of ammonia

Here, molecular weight of copper sulfate = 17 g

Also,

4.3 g of copper sulphate =should be

4.3 / 17

= .253 moles of copper sulphate

Now the total number of moles should be

=  .253 x 4

= 1.012 moles of ammonia.

hence, The number of moles of ammonia i.e. needed is 1.012 moles.

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Answer:

H2SO4 + CO3 = H2CO3 + SO4

Explanation:

H2SO4 + CO3

This is the reaction of sulphuric acid and carbon trioxide.

Balanced reaction is;

H2SO4 + CO3 = H2CO3 + SO4

So they react to produce carbonic acid and sulfate.

Mendel's first generation pea plants with purple flowers would have had two alleles for flower color.

Alleles are different versions or variants of a gene that occupy the same position, or locus, on a chromosome. Each individual inherits two alleles for each gene, one from each parent, which can be either the same (homozygous) or different (heterozygous). These alleles can have different effects on the organism's phenotype (observable trait) and can be dominant or recessive, with dominant alleles masking the expression of recessive ones. For example, in humans, the gene for eye color has different alleles that produce different colors such as brown, blue, or green. The specific combination of alleles that an individual inherits determines their genotype, which in turn influences their phenotype. The study of alleles and their inheritance patterns is a fundamental concept in genetics and has important applications in fields such as medicine, agriculture, and evolutionary biology.

Here,

However, the specific alleles cannot be determined from this information alone. According to Mendel's laws of inheritance, each individual inherits two alleles for each trait, one from each parent. These alleles can be either the same (homozygous) or different (heterozygous). If the two alleles are different, one may be dominant and determine the organism's phenotype (observable trait), while the other may be recessive and not expressed in the phenotype. In the case of Mendel's purple-flowered pea plants, the specific alleles responsible for the purple flower color would have been determined through further experimentation and analysis.

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The question requires us to draw the structural formula, provide the name and highlight any functional groups for the compound: diethyl ether.

The molecule diethyl ether can be represented as it follows, with two ethyl groups (-CH2CH3) bonded to a oxygen atom:

Note that the functional group ether (R-O-R) is present in the structre and highlighted in blue in the image. The official name of diethyl ether is ethoxyethane.

In 5.5ml blood, there will be 3.3 micrograms of iron present.

Iron is used by the body to produce hemoglobin, a protein found in red blood cells that transports oxygen from the lungs to all parts of the body, and myoglobin, a protein that provides oxygen to muscles.

In the given scenario, we need to find iron amount in 5.5ml blood.

We know that,

1ml = 0.001 dl.

5.5ml = 0.055dl.

As we know that there is nearly 60 micrograms of iron per deciliter of blood.

So,  0.055 dl of blood will have 3.3 micrograms of iron.

Thus, the correct answer is 3.3mg.

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Answer:

C. chromium is a metal that is less reactive than sodium.

Explanation:

Hello.

Given the options:

A. chromium is a nonmetal and therefore a good conductor of heat and electricity .

B. chromium is a metal that is more reactive than potassium .

C. chromium is a metal that is less reactive than sodium .

D. chromium is a noble gas that is not reactive.

In this case, since chromium is in period 4 group VIB we infer it is a transition metal which slightly reacts with acids and poorly reacts with oxygen and other oxidizing substances. Thus, in comparison with both sodium and potassium which are highly reactive even with water as they get on fire, we can say that it is less reactive than both potassium and sodium, therefore, answer is: C. chromium is a metal that is less reactive than sodium.

Best regards.

MnO4- + 4e- → MnO2 + 2H2O Now the half-equation is balanced in alkaline medium.

To balance the half-equation MnO4- → MnO2 in alkaline medium, we need to follow the steps for balancing redox reactions in basic solution. The goal is to balance the number of atoms and charges on both sides of the equation.

Start by balancing the atoms other than oxygen and hydrogen. In this case, we only have manganese (Mn) atoms. There is one Mn atom on both sides, so the Mn atoms are already balanced.

Balance the oxygen atoms by adding water (H2O) molecules to the side that lacks oxygen. Since there are four oxygen atoms on the left side (MnO4-) and only two on the right side (MnO2), we need to add two water molecules to the right side:

MnO4- → MnO2 + 2H2O

Next, balance the hydrogen atoms by adding hydrogen ions (H+) to the side that lacks hydrogen. In this case, the left side (MnO4-) already has sufficient hydrogen atoms, so no hydrogen ions need to be added.

Balance the charges by adding electrons (e-) to the side that has a higher charge. MnO4- has a charge of -1, while MnO2 has no charge. Since the left side has a higher charge, we need to add electrons to the right side:

MnO4- + 4e- → MnO2 + 2H2O

Now the half-equation is balanced in alkaline medium. The Mn atoms, oxygen atoms, hydrogen atoms, and charges are all balanced. The addition of water and hydrogen ions helps balance the oxygen and hydrogen atoms, while the addition of electrons balances the charges.

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Answer:

59.8287

Explanation:

I put that answer in and it is correct.

Answer:

16875 J

Explanation:

KINETIC ENERGY EQUATION = 1/2 m v^2

= 1/2 times mass times velocity of metres per second^2 (speed)

= 1/2 times 150 times by 15^2

= 16875 J (joules)

HCN, Na2SO4: Combination of compounds.

Mg3N2: Chemical compound.

CO2, H2O: Dissolution or hydration reaction.

Cu, Zn(NO3)2: Single-replacement reaction.

Na, N2: Combination of elements.

Let's analyze each chemical combination to determine the type of reaction involved:

HCN, Na2SO4:

The combination of hydrogen cyanide (HCN) and sodium sulfate (Na2SO4) does not represent a specific chemical reaction. It is simply the combination of two compounds.

Mg3N2:

Mg3N2 represents a chemical compound, magnesium nitride. It does not indicate a specific reaction.

CO2, H2O:

The combination of carbon dioxide (CO2) and water (H2O) represents a chemical reaction known as hydration or dissolution. When carbon dioxide dissolves in water, it forms carbonic acid (H2CO3), which can further dissociate into hydrogen ions (H+) and bicarbonate ions (HCO3-).

Cu, Zn(NO3)2:

The combination of copper (Cu) and zinc nitrate (Zn(NO3)2) represents a single-replacement reaction. Copper displaces zinc from the compound, resulting in the formation of copper nitrate (Cu(NO3)2) and zinc metal (Zn).

Na, N2:

The combination of sodium (Na) and nitrogen gas (N2) does not represent a specific reaction. It is simply the combination of two elements.

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Answer:

4.2 mol NH3

Explanation:

First, balance your reaction.

N2 + 3H2 --> 2NH3

Multiply 6.3 mol H2 by the mole ratio of 2 mol NH3 for every 3 mol H2 to get moles of NH3 produced.

6.3 mol H2 • (2 mol NH3 / 3 mol H2) = 4.2 mol NH3

De Broglie contributed to the development of the modern model of atoms by describing the wave properties of particles. Option E.

Louis de Broglie was a French physicist who made significant contributions to the development of quantum mechanics.

In his doctoral thesis, he proposed that particles, such as electrons, have both particle-like and wave-like properties. This idea became known as wave-particle duality and laid the foundation for the development of the modern model of the atom.

According to de Broglie's theory, particles can exhibit wave-like behavior and have a wavelength that is inversely proportional to their momentum.

This theory was later experimentally confirmed in a series of experiments that demonstrated the diffraction of electrons and other particles.

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The volume occupied at 25 °C. Remember to convert between °C and K. V2 = 3.311 L is the correct answer.

What is volume?

Volume is a measure of the amount of space occupied by an object, or the amount of matter contained within it. It is measured in units such as cubic metres, cubic centimetres, litres, millilitres, etc. Volume is a three-dimensional concept, meaning that it requires three measurements to be taken in order to accurately measure the amount of space an object occupies. The volume of a solid object can be determined by applying the formula V = l x w x h, where l is the length, w is the width, and h is the height of the object. For a liquid or gas, the volume is calculated by measuring its mass and the density of the substance. Volume can also be used to describe the total amount of space something occupies, such as the volume of a room or the volume of a storage container.

Temperature and Volume equation

Given,

The volume at -12°C = 2.90L

Temperature, T1 = -12°C

= (-12°C + 273)

= 261K

And, Volume at 25°C = ?

(25°C + 273)K

= 298K

Now, by using this equation:-

V1/T1 = V2/T2

V2 = V1 x T2/T1

V2 = 2.90L x 298K/261K

V2 = 3.311L

Hence, The volume at  25°C will be 3.311L

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Based on the description of the potential energy diagram provided, the diagram made by the student appears to be correct.

The potential energy diagram represents the energy changes that occur during a chemical reaction. In an endothermic reaction, the products have higher potential energy than the reactants, meaning energy is absorbed from the surroundings.

The curve line on the graph indicates the energy changes throughout the reaction pathway. It starts at a higher level, representing the initial potential energy of the reactants. As the reaction progresses, the potential energy decreases, indicating the formation of products with lower potential energy.

The broken horizontal line from point X on the y-axis to the point where the curve begins represents the activation energy (Ea) of the reaction. Activation energy is the energy barrier that must be overcome for the reactants to convert into products.

Point X on the y-axis indicates the potential energy of the reactants at the start of the reaction, and the broken line shows the energy required to initiate the reaction.

The broken horizontal line from point Y on the y-axis to the point where the curve ends represents the potential energy of the products. Point Y represents the potential energy of the products at the end of the reaction.

Overall, the student's diagram correctly represents an endothermic reaction, showing the potential energy changes, the activation energy, and the final potential energy of the products. The curve line starts at a higher level (representing the higher potential energy of the reactants) and ends at a slightly lower level (representing the lower potential energy of the products).

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Answer: Fluid molecules move quicker when it gets hot, and fluid molecules move slower when it turns cold. Usually, the heat process happens more often. This is the Kinetic Molecular Theory.

Answer:

See explanation

Explanation:

Polymerization refers to the formation of a macro-molecule by the aggregation of small molecules called monomers. Monomers are the small molecules that are joined together to form a polymer.

The formation of a condensation polymer is accompanied by the loss of a small molecules such as water as shown in the image attached.

Succinic acid reacts with ethylenediamine to form a nylon type polymer. The nature of this reaction is detailed in the image attached to this answer. Recall that a polymer may contain (n) number of monomers joined together in the macromolecule.

Answer:

A

Explanation:

For some reason its this I did not read the explanation but its correct

Answer:

42.9%

Explanation:

the total number of coins is 15+14+6 = 35

so to find the % of pennies, divide the number of pennies by the total number of coins and times it all by 100

15/35 x 100 = 42.9%

The percentage of pennies is 42.85 %.

We have a collection of coins.

We have to find the percentage of pennies in the collection.

One tenth of a United States dollar is labelled as dime.

According to the question -

Number of pennies n[p]= 15

Number of dimes n[d] = 14

Number of quarters n[q] = 6

Total number of coins = n[T] = n[p] + n[d] +  n[q] = 35

% of pennies can be calculated using -

(n[p] / n[T]) x 100 = (15/35) x 100 = 42.85%

Hence, the percentage of pennies is 42.85.

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Answer:

177.3 meters per second

Explanation:

Assuming that both gases are at the same temperature, we can use Graham's law to calculate the ratio of the average speeds of N2 and He molecules:

(ratio of speeds) = sqrt(molar mass of He/molar mass of N2)

The molar mass of N2 is 28.02 g/mol, and the molar mass of He is 4.00 g/mol. Therefore:

(ratio of speeds) = sqrt(4.00/28.02) = 0.379

We know that the average speed of N2 molecules is 468 m/s. Therefore:

(average speed of He molecules) = (ratio of speeds) x (average speed of N2 molecules) = 0.379 x 468 m/s = 177.3 m/s

Therefore, the average speed of He molecules at the same temperature is approximately 177.3 meters per second.

The IUPAC name for the compound shown is 3-ethyl-2,2-dimethylpentane.

International Union of Pure and Applied Chemistry is referred to as IUPAC. The terminology for naming organic compounds has been provided by IUPAC. The root name, prefix, and suffix are the three components that make up an IUPAC name.

There are five carbon atoms in the longest chain. Consequently, pent is the structure's root name. Choose the longest chain where the substituents are represented by the fewest numbers.

On the longest chain, three substituents are present. It consists of one ethyl group and two methyl groups. One ethyl group and two methyl groups are substituted at C-2 and C-3, respectively. Therefore, 3-ethyl-2,2-dimethyl will be the prefix. Alkane makes up the functional group. Therefore, the suffix is ane.

This ends up naming the compound as 3-ethyl-2,2-dimethylpentane.

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Answer:

A type of an atom which has a different number of neutrons but the same atomic number, therefore making it the same element. This atom would still have the same properties as well. (Ex: Vanadium-51 is an isotope of Vanadium that has 51 neutrons but still has 23 protons, as its atomic number is 23.)

Isotopes are variants of an element that have the same number of protons in their atomic nucleus, identifying them as the same chemical element, but differ in the number of neutrons.

The variations in neutron numbers among isotopes lead to differences in their atomic masses, resulting in isotopes having slightly different physical properties while retaining similar chemical behavior.

For example, in the case of boron, the two isotopes listed may have the same number of protons (5), but one has 6 neutrons, and the other has 7 neutrons, leading to slightly different atomic masses.

Similarly, for carbon and oxygen, the isotopes exhibit variations in neutron numbers while maintaining the same number of protons, defining them as isotopes of the respective elements. Isotopes play a crucial role in various scientific fields, including radiometric dating, nuclear energy, and medical imaging.

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Answer:

A

Explanation:

Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F.

Answer: 4.5 moles

Explanation:

To understand how to solve this problem, you must understand the ratios written in this chemical equation.

The equation shows that 4 moles of Al forms 2 moles Al₂O₃. This creates the ratio 2:4 or \(\frac{2}{4}\)

To solve, you can set the two ratios to each other and cross multiply.

\(\frac{2}{4} = \frac{x}{9}\)

18 = 4x

x = 4.5 mol Al₂O₃

*both \(\frac{2}{4}\) and \(\frac{4.5}{9}\) can be simplified as \(\frac{1}{2}\), which verifies your answer*

Answer:

The substances made from polyvinyls are generally brittle and hard. This property prevails because the polymer strands present in the polyvinyls form a very regular and well-organized packing composition in the solid-state. The Van der Waals associations between the strands make the substance brittle. To make the substance soft and suitable to use as a raincoat, the incorporation of small molecules is done within the molten polymer before the hardening of the plastic.

These polymer strands act as plasticizers and prevent the strands of polymer from forming a hard and brittle conformation.

The appearance and physical states of the material given is described below please look at it.

Baking soda: It is a white solid.

Salt: it is white in color having a solid physical state.

Sugar: It is white in color having crystals or solid in physical state.

Flour: It is creamish white in color having solid particles.

Vinegar: It is transparent in color.

Cooking oil: It is a yellowish emulsion.

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