Shawn has a bracelet made of an unknown metal. Shawn finds that the bracelet has a volume of 7 cm3 and a mass of 135 g. Which metal is the bracelet most likely made of?

Answer:

true

Explanation:

cause thereare both in liquid form

Answer:

0.20 moles

Explanation:

In order to solve this problem it is necessary to keep in mind the definition of molarity:

If we input the data given by the problem we're left with:

Meaning that we can proceed to calculate the number of moles:

The number of moles of glucose (\(C_6H_{12}O_6\)) in 0.500 Liters of a 0.40 M solution is 0.2 moles.

Given the following data:

To determine the number of moles of glucose (\(C_6H_{12}O_6\)) in 0.500 Liters of a 0.40 M solution:

Mathematically, the molarity of a solution is given by the formula:

\(Molarity = \frac{number\;of\;moles}{Volume \;in\;liters}\)

Making number of moles the subject of formula, we have:

\(Number\;of\;moles = Molarity \times Volume\)

Substituting the given parameters into the formula, we have;

\(Number\;of\;moles = 0.40 \times 0.500\)

Number of moles = 0.2 moles.

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Answer:

The volume of the gas when it is released from the tanks will be equal to 10.00 L x (150.0 mmHg / 3.400 x 10⁴ mmHg) = 0.004412 L.

Explanation:

Answer:

D............................

There are two types of chemical compound one is covalent compound and another is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. The correct representation is option D.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent bond is present in molecule HCl. Hydrogen has 1 electron in its outermost shell. Chlorine has 7 electrons in its valence shell. So one one electron from each element is shared between them to form a covalent bond.

Therefore, the correct representation of arrangement of electrons in a hydrogen chloride molecule is option D.

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In the given equation N2 + 3H2 --> 2NH3, the ratio 3:2 relates the number of moles of H2 required to react with one mole of N2 to produce two moles of NH3.

This means that for every three moles of H2, one mole of N2 will react to produce two moles of NH3. The stoichiometric ratio, or mole ratio, is an important concept in stoichiometry, as it allows us to calculate the quantities of reactants and products involved in a chemical reaction. In this case, if we know the amount of N2 and H2 present in the reaction, we can use the mole ratio to determine the amount of NH3 that will be produced.

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NH3.

The balanced chemical equation N2 + 3H2 --> 2NH3 shows that for every 3 moles of H2, 2 moles of NH3 are produced.

This means that the stoichiometric ratio of H2 to NH3 in this reaction is 3:2.

This ratio indicates that if you have a certain number of moles of H2, you can determine the maximum amount of NH3 that can be produced in the reaction.

For example, if you have 6 moles of H2, you can calculate that the maximum amount of NH3 that can be produced is 4 moles, based on the stoichiometric ratio of 3:2.

The work done when the gas expands isothermally is approximately -99,000 J. The work done in an isothermal expansion and reversible expansion is approximately -700 J.

(a) To calculate the work done when the gas expands isothermally against a constant external pressure of 30.0 kPa, we can use the formula:

Work = -Pext * ΔV

Where:

Pext is the external pressure,

ΔV is the change in volume.

Given:

Mass of methane (CH4) = 4.50 g

Volume initial (Vi) = 12.7 dm^3

Volume final (Vf) = 12.7 dm^3 + 3.3 dm^3 = 16.0 dm^3

External pressure (Pext) = 30.0 kPa = 30,000 Pa

First, we need to convert the mass of methane to moles:

Molar mass of CH4 = 12.01 g/mol (C) + 4 * 1.01 g/mol (H) = 16.05 g/mol

Moles of CH4 = mass / molar mass = 4.50 g / 16.05 g/mol = 0.280 moles

Since the process is isothermal, the temperature remains constant at 310 K. We can assume ideal gas behavior for methane under these conditions.

Now, we can calculate the work done:

ΔV = Vf - Vi = 16.0 dm^3 - 12.7 dm^3 = 3.3 dm^3 = 3.3 L

Work = -Pext * ΔV = -30,000 Pa * 3.3 L = -99,000 J

(b) To calculate the work done in an isothermal and reversible expansion, we can use the formula for reversible work:

Work = -nRT * ln(Vf/Vi)

Where:

n is the number of moles,

R is the ideal gas constant (8.314 J/(mol·K)),

T is the temperature in Kelvin,

Vf is the final volume, and

Vi is the initial volume.

Using the values from the previous calculations:

Work = -nRT * ln(Vf/Vi)

= -(0.280 mol) * (8.314 J/(mol·K)) * 310 K * ln(16.0 dm^3 / 12.7 dm^3)

≈ -700 J

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The empirical formula of the oxide is Cu₂O

We'll begin obtaining the mass of the oxide, copper and oxygen. This is shown below:

Mass of oxide = (Mass of container + copper oxide) - (Mass of container

Mass of oxide = 26.97 - 25.61

Mass of oxide = 1.36 g

Mass of copper = (Mass of container + copper) - (Mass of container)

Mass of copper = 26.82 - 25.61

Mass of copper = 1.21 g

Mass of oxygen = (Mass of oxide) - (Mass of copper)

Mass of oxygen = 1.36 - 1.21

Mass of oxygen = 0.15 g

Finally, we shall determine the empirical formula of the oxide. Details below

Divide by their molar mass

Cu = 1.21 / 63.55 = 0.0190

O = 0.15 / 16 = 0.009375

Divide by the smallest

Cu = 0.0190 / 0.009375 = 2

O = 0.009375 / 0.009375 = 1

Thus, the empirical formula of the oxide is Cu₂O

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Complete question:

An oxide of copper was reduced to form copper metal by reaction with hydrogen. Use the data in the table to find the empirical formula of this oxide of copper.

Table reads as follows:

Container – 25.61g

Container + copper oxide (before reaction) – 26.97g,

Container + copper (after reaction) – 26.82g.

IUPAC name -Ascorbic Acid (Vitamin C)-(5R)-[(1S)-1,2-Dihydroxyethyl]-3,4-dihydroxyfuran-2(5H)-one, Fruit sugar or D-fructose are other names for fructose-fructose. D-glucose, or glucose.

Early in the 1930s, vitamin C—then known as "hexuronic acid"—was extracted from fruits, vegetables, and the adrenal cortex. After being proved to treat scurvy in guinea pigs, it was renamed ascorbic acid to reflect its anti-scorbutic qualities.

Description. Ascorbic acid, a naturally occurring organic substance with antioxidant qualities, is offered by TCC. C6H8O6 is its chemical formula. It is a crystalline white substance that mixes easily with water to form moderately acidic solutions.

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Yes, Iron reacts with O2 to give an iron oxide.

When iron comes in contact with oxygen in presence of water it gives ferric oxide, Also known as rust is formed.

The balanced chemical reaction of above is given as follows,

4Fe + 3O2 + x. H2O → 2Fe2O3.xH2O.

A redox commerce between oxygen and iron in a water-rich terrain, similar as largely sticky air, results in the conformation of rust. The rusting of iron is characterised by the conformation of a subcaste of a red, short substance that readily breaks into greasepaint. The rusting process can be stopped or braked down with a fleece of oil painting. A high- quality makeup will also help to decelerate down rusting by keeping humidity from getting to the essence.

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Answer:

0.14 liters nitric acid

Explanation:

Molarity = moles / liter

7.0 M = x / 0.03 L

= 0.21 moles NaOH

0.21 moles NaOH x ( 1 mole HNO3 / 1 mole NaOH) = 0.21 moles HNO3

Molarity = moles / liter

1.5 M  = 0.21 moles / x

x = 0.21 moles / 1.5 M

x = 0.14 Liters HNO3

Answer:

\(140mL\)

Explanation:

\(M_1V_1=M_2V_2\)

\(M_1=1.5M\) molarity of nitric acid

\(V_1=?\)  volume of nitric acid

\(M_2=7.0M\) molarity of sodium hydroxide

\(V_2=30.0mL\) volume of sodium hydroxide

\((1.5M)(V_1)=(7.0M)(30.0mL)\)

\(V_1 =\frac{(7.0M)(30.0mL)}{1.5M}=140mL\)

Hope this helps whoever needs it :)

Have a good day!!!

A limiting reactant problem is a type of stoichiometry problem that involves determining which reactant in a chemical reaction will be completely consumed, and therefore limit the amount of product that can be formed.

The key clue that a problem is a limiting reactant problem is the presence of information about the amounts or masses of two or more reactants that are involved in a chemical reaction. In a limiting reactant problem, you are typically given the amounts of two or more reactants, and asked to determine the amount of product that can be formed.

To solve a limiting reactant problem, you must first determine the balanced chemical equation for the reaction, and then use stoichiometry to calculate the theoretical amount of product that can be formed from each reactant. The reactant that produces the smallest amount of product is the limiting reactant, because it will be completely consumed in the reaction, while the other reactant(s) will be left over.

The calculation of the limiting reactant and the amount of product produced from it is what sets a limiting reactant problem apart from other stoichiometry problems. In other types of stoichiometry problems, you may be given the amount of a single reactant or product, and asked to find the amount of another reactant or product using stoichiometry.

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Answer:

Of what?

Explanation:

But uhh: An acid is a substance that donates protons or accepts a pair of valence electrons to form a bond. Bases can be thought of as the chemical opposite of acids.

Energy levels are the fixed distances of electrons from the nucleus, sublevel is a level that is lower than another level whereas an orbital is the most likely location of an electron present around an atom.

The sublevels contain carry orbitals. Orbitals are spaces that have a high prospect of containing an electron. An orbital is an area or location where the electrons are present. There can be two electrons in one orbital extreme. Each energy level or shell is divided into many sublevels. Both sublevel and subshell are used interchangeably. The sublevels are constituted by the letters s, p, d, and f. Each energy level has certain sub-levels. Therefore, these circular orbits are called as energy levels or energy shells. The orbits of an atom act for the energy levels of the electrons in it.

So we can conclude that Orbitals and sublevels are both concepts used in chemistry to describe the energy states of electrons.

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The law of conservation of mass is must be applied when cooking.

Law of conservation of mass states that mass of any substance will change into another form without any loss of mass, means destroying of mass is impossible.

When we cook food then mass of conservation is applied there, for example we are boiling pulses with water then in that case the amount of formed liquid pulses is equal to the initial mass of solid pulse with water.

Hence law of conservation of mass is applicable during cooking.

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Explanation:

i have done

see the picture

and please mark me brainiest

The principle of faunal succession is a key concept in the study of prehistoric life and the age of sedimentary rocks. It is based on the idea that the fossilized remains of different species of animals and plants found in sedimentary rocks can be used to infer the relative age of the rocks and the conditions that existed when they were formed.

The principle of faunal succession states that over time, the species of animals and plants that lived in a particular area changed and evolved. As a result, the fossilized remains of different species found in sedimentary rocks can be used to infer the relative age of the rocks.

This principle is based on the idea that the fossil record is a record of the evolution of life on Earth. In addition, the principle of faunal succession also provides insight into the ancient environment and climate. For example, the presence of certain types of fossils, such as coral reefs or tropical plants, may indicate that the area was once a warm, shallow sea.

In all, the principle of faunal succession is a powerful tool that connects prehistoric life to the age of sedimentary rocks. By studying the fossilized remains of different species found in sedimentary rocks, scientists can infer the relative age of the rocks and the conditions that existed when they were formed.

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The number of the hydrogen atoms that would be required from the diagram is 10.

A Saturated compound has all its carbon atoms connected by single bonds, and each carbon atom is bonded to the maximum number of hydrogen atoms possible. This arrangement allows the compound to have no available or unsaturated bonds for additional atoms.

The compound that is shown must be butane as such the number of the hydrogen atoms that it contains is a total of ten.

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Answer: By Stoichiometry, 3 moles of chlorine gas reacts with 6 moles of sodium hydroxide solution to form 5 moles of sodium chloride, 1 mole of sodium chlorate (V) and 3 moles of water. Hence, the reaction between chlorine gas and hot, concentrated NaOH solution yields Sodium chloride and sodium chlorate(V).

Explanation: Hope it helps :)

The pair of atoms that form the most polar bond is C and F.

Hence, option A is correct answer.

The difference in electronegativity between the two atoms that make up a bond determines its polarity. An atom's ability to draw electrons into covalent bonds is measured by its electronegativity.

The bond becomes more polar as the difference in electronegativity between the two atoms increases. In order of decreasing electronegativity, fluorine is the most electronegative element, followed by oxygen, nitrogen, and carbon.

Therefore, the most polar bond would be formed by the combination of the two atoms with the greatest electronegativity difference, which is between the atoms of the option (a) C and F, where the electronegativity difference is the greatest.

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Answer:

Just add and multiply after divding and lol

Explanation: add then add

Answer:

MASS

Explanation:

Formula for heat energy will be;

Q = mcΔt

Where;

m is mass

c is specific heat capacity

ΔT is change in temperature

Now, since both substances are copper, it means they will have the same specific heat capacities.

Thus, from the formula given earlier, it is seen that the mass is inversely proportional to the temperature change.

This means that the smaller the mass, the greater the temperature change.

Thus, the 3 g sample of copper will experience a greater temperature die to its smaller mass

4.33 grams of nitrogen are produced when 7.80 grams of dinitrogen tetrahydride reacts with hydrogen peroxide.

To determine the mass of nitrogen (N2) produced when 7.80 grams of dinitrogen tetrahydride (NaH) reacts with hydrogen peroxide (H2O2), we need to calculate the stoichiometry of the balanced chemical equation and use the molar masses of the compounds involved.

The balanced chemical equation is:

2NaH + 2H2O2 → N2 + 4H2O

From the equation, we can see that 2 moles of NaH react with 2 moles of H2O2 to produce 1 mole of N2. To find the molar mass of N2, we add the atomic masses of two nitrogen atoms:

Molar mass of N2 = 2 × Atomic mass of nitrogen = 2 × 14.01 g/mol = 28.02 g/mol

Now, let's calculate the number of moles of NaH:

Moles of NaH = Mass of NaH / Molar mass of NaH

Moles of NaH = 7.80 g / (22.99 g/mol + 1.01 g/mol) ≈ 0.3088 mol

According to the balanced equation, the molar ratio of NaH to N2 is 2:1. Therefore, the moles of N2 produced will be half the moles of NaH used:

Moles of N2 = 0.3088 mol / 2 ≈ 0.1544 mol

Finally, to find the mass of nitrogen produced, we multiply the moles of N2 by the molar mass of N2:

Mass of N2 = Moles of N2 × Molar mass of N2

Mass of N2 = 0.1544 mol × 28.02 g/mol ≈ 4.33 g

Therefore, approximately 4.33 grams of nitrogen are produced when 7.80 grams of dinitrogen tetrahydride reacts with hydrogen peroxide.

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The end result of glycolysis is the production of two molecules of pyruvate or pyruvic acid i.e CH₃COCOOH, two molecules of ATP, and two molecules of NADH. Option B is correct.  

Pyruvate is a three-carbon molecule that can be further metabolized through the Krebs cycle and oxidative phosphorylation to produce more ATP.

Glycolysis is important because it is the first step in the breakdown of glucose to extract energy for cellular metabolism. Glucose is a major source of energy for most living organisms, and glycolysis provides the initial breakdown of glucose to produce ATP.

This process can occur in the absence of oxygen, which is essential for cells that cannot access oxygen. In addition, the two ATP molecules produced in glycolysis provide immediate energy for cellular processes, and the NADH molecules produced can be used to generate more ATP through the subsequent steps of cellular respiration.

Hence, B. CH₃CO.COOH is the correct option.

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--The given question is incorrect, the correct question is

"what is the end result of glycolysis? why is this step important? A) CH₃CH₂OH B) CH₃CO.COOH C) CH₃HCOH -- COOH D) CH₃CH₂COOH"--

Answer:

Assuming both players are on the same surface and are wearing the same kind of shoes, who will win the game and why?

Mason will win because although he is applying less force than William, he is smaller and can move faster than William.

Answer:

10.80

Explanation:

As per the equation, let us calculate the mole ratio. N2+3H2→2NH3. As per the equation one mole of nitrogen  reacts with 1 mol of hydrogen.

In terms of mass. 28.01 g of nitrogen needs 3 mol of hydrogen or 6.048 g of hydrogen.

We can set up the ratio;

28.01 g of

l

N

2

needs  

6.048 g of

l

H

2

1 g of

l

N

2

needs  

6.048

28.01

g  of

l

H

2

50.0 g of

l

N

2

needs  

6.048

×

50.0

28.01

l

g of

l

H

2

=

10.80 g of

l

H

2

Silk and wool are more easily dyed with azo dyes than other fabrics like nylon or cotton because they are polypeptides.

Polypeptides or polymers made of amino acids are what makeup wool and silk. Natural protein fibers like wool and silk, synthetic polyamide fibers like nylon, and, to a lesser extent, acrylic fibers and blends of these fibers, are typically dyed with acid dyes. They are applied to these fibers from a dyebath under acidic or neutral conditions, thus their name. The azo group is the most widely used chromophore in acid dyes. When an ionic bond is formed between the protonated amine group of the fiber and the acid group of the dye, acid dyes that are anionic and soluble in water are applied to wool, silk, and nylon

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Answer:

Word Equation: Zinc + Copper (II) Nitrate ---> Zinc Nitrate + Copper

Symbol Equation: \(Zn+Cu(NO_{3} )\) \(2\) ---> \(Zn(NO_{3} )\)\(2\) + \(Cu\)

Balanced Chemical Equation: Zn+Cu(NO_{3} )2 ---> Zn(NO_{3} )2 + Cu

                    Simple replacement Reaction

Word Equation: Methane + Oxygen ---> Carbon Dioxide + Water (H2O)

Symbol Equation: CH4 + O2 → CO2 + H2O

Balanced Chemical Equation: CH4 + 2 O2 → CO2 + 2 H2O

                        Combustion reaction (--->CO2 + H20)

Word Equation: Aluminum + Bromine ---> Aluminum Bromide

Symbol Equation: Al + 2 Br ---> AlBr3

Balanced Chemical Equation: 2 Al + 3 Br ---> 2 AlBr3

                                 Synthesis reaction

Word Equation: Lead (II) Nitrate + Potassium Iodide ---> Lead Iodide + Potassium Nitrate

Symbol Reaction: Pb(NO3)2 + KI = PbI2 + KNO3

Balanced Chemical Reaction: Pb(NO3)2 + 2 KI = PbI2 + 2 KNO3

                            Double replacement reaction

Word Equation: Sodium Bicarbonate ---> Sodium Carbonate + Carbon Dioxide + Water (H2O)

Symbol Reaction: NaHCO3 = Na2CO3 + CO2 + H2O

Balanced Chemical Equation: 2 NaHCO3 = Na2CO3 + CO2 + H2O

                                Decomposition reaction

I've worked very long on this, so pls give brainliest and...

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Sugar is a simple carbohydrate consisting of carbon, oxygen, and hydrogen molecules which are linked by covalent bonds.

The chemical covalent bonds are a type of chemical bond in which atoms that differ in their electronegativity share electrons to maintain cohesion i.e., intramolecular cohesion, while sugar molecules may interact by glycosidic bonds.

Therefore, with this data, we can see covalent bonds bind atoms in the sugar molecule while glycosidic bonds are those required to connect different sugar and thus form a complex macromolecule or polysaccharide.

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To find the dissociation constant of an acid, you can use the following equation: K = [H+][A-]/[HA], where K is the dissociation constant, [H+] is the concentration of the hydronium ion, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid.

Larger values of Ka indicating stronger acids.

To find the dissociation constant of an acid, you can use the following steps:

1. Write the balanced chemical equation for the dissociation of the acid. For example, for acetic acid (\(CH_{3}\)COOH), the equation would be \(CH_{3}\)COOH ⇌ \(CH_{3}\)COO- + H+.

2. Write the expression for the acid dissociation constant (Ka). For the above example, the expression would be Ka = [\(CH_{3}\)COO-][H+]/[CH3COOH].

3. Substitute the concentrations of the species into the expression. You can find the concentrations using experimental data or by using an ICE table.

4. Solve for Ka. If you have the concentrations of all the species, you can simply plug them into the expression and solve for Ka. If you are using an ICE table, you will need to solve for the equilibrium concentrations before plugging them into the expression.

By following these steps, you can find the dissociation constant of an acid. Remember that the dissociation constant is a measure of the strength of an acid, with larger values indicating stronger acids.

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