You are given two metal cubes that look similar. One has an edge of 3. 2 cm long and a mass of 43. 63 g. The other has an edge of 8. 34 cm long and a mass of 683. 5 g. How can you determine if both cubes are made from the same material? select the true statements.

The spectator ions are Na+ and I when mixing aqueous solutions of BaI2 and Na2SO4 to create a precipitate of BaSO4.

What are spectator ions?

Spectator ions are ions that are present on both sides of chemical reactions but do not take part in the reaction itself. In the net chemical reaction, the spectator ions on both sides of the equation are cancelled. So, to "spectate" is to "see" the other ions in an aqueous solution interact with one another.

The spectator ions are Na+ and I when mixing aqueous solutions of BaI2 and Na2SO4 to create a precipitate of BaSO4.

Let's look at the chemical formula for the reaction that happens when BaI2 and Na2SO4 are combined in aqueous solution. This reaction involves two displacements.

BaSO4(s) + 2 NaI = BaI2(aq) + Na2SO4(aq) (aq)

Let's now have a look at the net ionic equation, which takes into account both the insoluble species and the reacting ions (not spectator ions).

Ba2+(aq) SO42(aq) BaSO4 (s)

As we can see, Na+ and I are the spectator ions that are missing from the net ionic equation.

The spectator ions are Na+ and I when mixing aqueous solutions of BaI2 and Na2SO4 to create a precipitate of BaSO4.

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Answer: The answer Option is A.

Explanation: Both the Ions have the electronic configuration 2,8,8

The electronic configuration of an ion is 2.8.8. This ion is S²⁻.

The term electronic configuration is defined as the arrangement of electrons in orbitals around an atomic nucleus.There are four different types of orbitals (s,p,d, and f) have different shapes, and one orbital can contain a maximum of two electrons.

The symbols used for writing the electron configuration start with the shell number (n) and then the type of orbital and finally the superscript represent how many electrons are present in the orbital.

The electronic configuration of an ion is 2.8.8. This ion is S²⁻. Because S²⁻ contain  electronic configuration of an ion is 2.8.8 while electronic configuration of S is 2, 8, 6.

Thus, The electronic configuration of an ion is 2.8.8. This ion is S²⁻.

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An ion is a charged version of an atom that is formed by losing or gaining electrons compared to the atom.

Cations are positively charged atoms.

Anions are negatively charged atoms.

For example, calcium atom forms cation.

Electron configuration of calcium atom: ₂₀Ca 1s² 2s² 2p⁶ 3s² 3p⁶ 4s².

Electron configuration of calcium cation: ₂₀Ca²⁺ 1s² 2s² 2p⁶ 3s² 3p⁶.

Calcium cation is smaller than neutral calcium atoms, because when an electrons are lost, electron-electron repulsion decreases and the protons are better able to pull the remaining electrons towards the nucleus.

When calcium loose two electrons, it will have 20 protons (positive charge) and 18 electrons (negative charge), which means it has two protons more and it has +2 oxidation number.

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Correct compound is [Co(H2O)6]^+3

The oxidation state of Co is +3

[Co(H2O)6]^+3

Let

 Co be x

 H2O = 0

 x + (0)6 = 3

 x = 3

What is oxidation state?

The oxidation state, commonly known as the oxidation number, is the potential charge that an atom would have if all of its bonds to other atoms were fully ionic. It describes the degree of atom oxidation within a chemical compound.The oxidation state may be positive, negative, or zero in theory.

The oxidation number, sometimes referred to as the oxidation state, is the total number of electrons that an atom gains or loses while uniting with another atom to form a chemical bond.

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Answer: penlalalalaooooaaaaaaaaaaa

Explanation: pen

In the image provided below, you can see the structure of 1,3-dinitrocyclopentane.

We can conclude the following information from the compound's name, 1,3-dinitrocyclopentane, which will assist us in drawing the structure :-

1,3 - position of NO₂ groups, di - two, nitro - NO₂, clo - cyclic, pentane - five.

➤ The following are the general steps for drawing any compound's        Lewis structure:

According to the Octet Rule almost all atoms, in this case, carbon must always have four bonds because they are most stable with eight total electrons.

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Answer:

Evaporate a solution of  CuSO4⋅5H2O to dryness

Explanation:

To dehydrated you have to get rid of the water and water evaporates so you have to evaporate the solution.

Procedure that could be used to convert the pentahydrate form to the dehydrated form is to evaporate a solution of CuSO₄⋅5H₂O to dryness.

Copper(II) sulfate pentahydrate (CuSO₄·5H₂O) form aqueous solutions of bright blue.

After the heating, dehydrated form copper(II) sulfate is formed.

Salt copper(II) sulfate has white color.

Adding a water in white copper(II) sulfate would make solution blue again.

Hydrate is a substance that contains water or its constituent elements.

M(CuSO₄·5H₂O) = 249.5 g/mol; molar mass of copper sulphate pentahydrate

Evaporation occurs when the molecules at the surface of a liquid gain enough energy to overcome the force of attraction of other molecules in the liquid phase.

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The mole fraction of acetyl bromide is 0.534 and heptane is 0.466.

An acyl halide, sometimes referred to as an acid halide, is a chemical molecule created by swapping out the hydroxyl group in an oxoacid with a halide group.

The chemical has a -COX functional group, which is made up of a carbonyl group that is singly linked to a halogen atom, if the acid is a carboxylic acid. The general formula for such an acyl halide can be represented as RCOX, where X stands for the halide, such as chloride, and R may be, for example, an alkyl group. Although acyl chlorides are the most frequent acyl halides, acetyl iodide is the one that is created (temporarily) on a big scale. The annual manufacturing of acetic acid results in billions of kilograms.

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79.91 g moles of copper were in the copper oxide formed.

Using the molar mass of 125.00 grams of copper (II) sulfate pentahydrate (CuSO45H2O), we first determine how many moles there are:

(Molar Mass of CuSO4) + 5*(Molar Mass of H2O) = Molar Mass of CuSO45H2O.

CuSO45H2O's molar mass is equal to 249.68 g/mol moles. CuSO45H2O = 125.00 g x 249.68 g/mol x 0.501 mol

CuSO4 and 5H2O undergo a reaction, resulting in CuSO4.

Using the molar mass of CuSO4, we can now convert 0.501 moles of anhydrous copper (II) sulfate into grams:

79.91 g CuSO4 is equal to 0.501 mol CuSO4 times 159.609 g/mol.

The most prevalent form of copper(II) sulfate hydrate is the pentahydrate (n = 5). The pentahydrate has also gone by the names blue vitriol, bluestone, copper vitriol, and Roman vitriol in the past. The most prevalent form of copper(II) sulfate is the vivid blue pentahydrate CuSO45H2O.

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Answer:

sulfuric acid + sodium hydroxide -> sodium sulfate + water

NaOH (aq) + H₂SO₄ (aq) → Na₂SO₄ (aq) + H₂O

(″ロ゛) x

312 grams of oxygen reacts.

Balanced chemical equation for the reaction of hydrogen and oxygen to produce water: 2H₂ + O₂ → 2H₂O.

m(H₂) = 39.3 g; mass of hydrogen

n(H₂) = m(H₂) ÷ M(H₂).

n(H₂) = 39.3 g ÷ 2 g/mol.

n(H₂) = 19.65 mol; amount of hydrogen

m(H₂O) = 351 g; mass of water

n(H₂O) = 351 g ÷ 18 g/mol

n(H₂O) = 19.5 mol; amount of water

From chemical equation: n(O₂) : n(H₂O) = 1 : 2

n(O₂) = 19.5 ÷ 2

n(O₂) = 9.75 mol; amount of oxygen

m(O₂) = 9.75 mol × 32 g/mol

m(O₂) = 312 g; mass of oxygen

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1. Apple juice has a pH of around 3 and lemon juice has a pH near 2. to neutralize with baking soda lemon juice would need more baking soda because it is more acidic than aple juice. the less  ph present the more baking soda need to neutralize.

2. A "mole" is the quantity of a material that is precisely 6.02214076 X 1023 particles in the International System of Units. Ions, atoms, or molecules might make up the particles.

The number of moles of a solute in a litre of solution is known as molarity (M). The symbol for molarity is M, which stands for mole/liter.

Molarity is a measure of a solution's concentration that is expressed in units of moles per litre. Therefore, molarity is utilised to calculate the solute's volume.

3 Hexane will  dissolve in  ionic salt like LiCl because both of the compound are covalent and non-polar and like dissolves like.

4.Every enzyme has a preferred pH range. Outside of this range, pH changes will limit enzyme activity. Enzymes can denature at extreme pH levels. If there is a substrate available for the enzyme to bind to, increasing the concentration of the enzyme will hasten the process.

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The molar fraction of 25% w/w acetic acid solution is 0.069.

The molar fraction of solute in a solution is given by the following formula

Molar fraction of solute = No. Of Moles of solute/No. Of Moles of solute + No. of Moles of solvent

In this case the solute is acetic acid and solvent is water.

It is given that the acetic acid is 25% weight by weight(w/w), which means that 25 grams of acetic acid is present in 100 grams of water.

To calculate the moles, we need to divide the given mass by the molar mass of the compound

No. of moles of Acetic Acid(CH3COOH)= 25/60 = 0.416

And no. of moles of water (H2O) = 100/18 = 5.55

Putting the values in the given formula

Molar fraction of solute = 0.416/5.55+0.416

= 0.069

Hence, the molar fraction of 25% w/w acetic acid solution is 0.069.

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Answer:

The answer is there are 9.57 x 10²⁰ number of Cl atoms in 0.0728 g of PCl₃.

Number of moles = mass / molar mass

Mass of PCl₃ = 0.0728 g and molar mass of PCl₃ = 137.33g/mol

Number of moles of PCl₃ = 0.0728 / 137.33 = 5.3 x 10⁻⁴

In one mole there are Avogadro’s number of molecules that is 6.02 x 10²³

So, in 5.3 x 10⁻⁴ moles of PCl₃, there are =5.3 x 10⁻⁴ x 6.02 x 10²³ = 3.19 x 10²⁰

Now there is 3 atoms of Cl in PCl₃ so in 3.19 x 10²⁰ molecules of PCl₃, number of Cl atoms = 3.19 x 10²⁰ x 3 = 9.57 x 10²⁰ atoms

The accuracy of the results could be improved by;

1) The use of porcelain to observe the end point

2) Rinsing the burette with the ethanedioic acid solution before the titration begins.

The term titration has to do with the process by which we use a neutralization reaction to be able to determine the concentration of substances that participate in the reaction. Now we know that titration is one of the ways by which we are able to carry out a volumetric analysis. The term volumetric analysis has to do with the type of analysis that involves the use of the volume of the analyte.

The titrant is put into the flask and the titrand is put in the burette. We always have to make use of an indicator to be able to know when the end point or the equivalence point of the reaction have been achieved in the process of the titration.

The accuracy of the results could be improved by;

1) The use of porcelain to observe the end point

2) Rinsing the burette with the ethanedioic acid solution before the titration begins.

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The energy and intermolecular forces involved for liquid solid and gas are as follows:

Intermolecular forces are forces of attraction that exists between the molecules of a substance.

The strength of the intermolecular forces and hence, the kinetic energy vary inversely in molecules of solids, liquids and gases.

The energy and intermolecular forces that are involved for liquid solid and gas are explained below:

In conclusion, intermolecular forces decrease with increase in the kinetic energy of molecules.

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The chemical properties could be obtained by adding acid to the plastic to see if it reacts.

Chemical properties are those properties that could only be observe when a substance undergoes chemical change. In this case, a chemical change could also be called a chemical reaction.

A substance could be said to undergo a chemical reaction  if there is a rearrangement of the atoms of the compound. This would ultimately lead to the formation of a new substance.

Now the forensic scientist wants to know the chemical properties of the plastic. This could be done by reacting the plastic with acid.

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Answer:

The short answer is (C)  Add acid to the plastic to see if it reacts

Explanation:

Got it right on my quiz.

The solid object that has a density of 3.26 g/ml has a mass equal to 20.864 g.

If the water level rises to 26.40 ml from an initial of 20.00 ml after a solid object is added, then the difference between the final and initial volume of water is the volume of the solid.

volume of solid = final volume - initial volume

volume of solid = 26.40 ml - 20.00 ml

volume of solid = 6.40 ml

If the solid object has a density of 3. 26 g/ml and a volume of 6.40 ml, using the formula for density, solve for its mass.

density = mass/volume

3. 26 g/ml = mass/6.40 ml

mass = 3. 26 g/ml(6.40 ml)

mass = 20.864 g

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A protein mixture is commonly applied to a HIC column under high salt conditions, and the protein of interest is eluted with a buffer of decreasing ionic strength.

Structured salts added to the equilibration buffer and sample promote ligand-protein interactions in HIC. The amount of bound protein decreases as the salt concentration decreases, as does the risk of protein precipitation at lower ionic strength.

Despite the fact that sodium, potassium, or ammonium sulfates have a higher precipitation effect, these salts effectively promote ligand-protein interactions in HIC. Most bound proteins are eluted by washing with water or a dilute buffer with a pH close to neutral.

What exactly is HIC?

Hydrophobic interaction chromatography (HIC) is a technique used to separate molecules based on their hydrophobicity. HIC is a useful separation technique for purifying proteins while retaining biological activity due to the use of less denaturing conditions and matrices.

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the mass of carbon required to produce

17.6 g of carbon dioxide will be 6 gram.

In the reaction,

C+ O₂ → CO₂

Given,

The atomic mass of Carbon is 12g/mol

molar mass of O2 is 32g/mol

1 mole of C get reacted with 1 mole of O2.

no. of moles in O₂ = 16/32 = 0.5

so, 0.5 moles of Ow will react with 0.5 moles of C

Moleculer weight of Carbon is 12

Mass of carbon = 0.5 × 12 = 6 gm

Hence, mass of carbon required is 6 g.

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Mycolic acids are found in the cell wall of acid-fast bacteria, preventing these cells from being gram-stained.

Acid-fast bacteria are a kind of bacteria that contains waxy material called mycolic acid in their cell wall making them water-resistant against staining procedures and materials such as gram stain.

Mycolic acids are lengthy chains of fatty acids found in bacteria and, therefore, are called acid-fast bacteria.

When these bacteria come into contact with substances like acidic alcohol, they develop resistivity against them to prevent decolorization.

In short, mycolic acids prevent the decolorization and staining of bacteria due to their characteristics of resistance and reluctance.

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Al is equal to 0.0463 moles of aluminum in 1.25 grams.

The ratio of aluminum to alum is 1:1, meaning that for every mole of aluminum consumed, 1 mole of alum is created.

The calculated yield is 21.96 g of alum.

Yield as a percentage is 68.97%.

Acute and chronic oral LD50 values for aluminum sulfate are both more than 5,000mg/kg, making it relatively non-toxic. Alum can nonetheless irritate the skin, burn, and worsen respiratory conditions. It can lead to headaches, nausea, and respiratory irritations when breathed.

It is an astringent, which means it causes the skin to constrict or shrink, first of all. Astringents have the short-term ability to shrink pores and tighten skin. Alum is a helpful preservative because it is bacteriostatic, which means it inhibits the growth of bacteria.

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The quantity of matter in an item is its mass. Scientists frequently use balances to quantify mass. Using an electronic balance or a beam balance, one may directly determine the mass of solids.

The quantity of matter in an item is its mass. Scientists frequently use balances to quantify mass. Using an electronic balance or a beam balance, one may directly determine the mass of solids. A liquid's mass can be calculated by measuring its volume and using the density table to determine the liquid's density.

The kilograms is the SI unit of mass (Kg). To get an object's mass, divide its weight by the acceleration of gravity. The weight units must be changed to Newtons. For instance, 1 kg equals 9.807 N. If you want to know an object's mass on Earth, divide its weight in Newtons by the Earth's gravitational acceleration, which is 9.8 meters per second2.

Here, solute is solid cocl2 and our solvent is distilled water.

The volume of solute is generally ignored, so we would dissolve,

[tex]$250 \mathrm{~mL} \cdot \frac{\mathrm{L}}{10^3 \mathrm{~mL}} \cdot 0.150 \mathrm{M} \cdot \frac{129.9 \mathrm{~g}}{\mathrm{~mol}} \approx 5.68 \mathrm{~g}$[/tex]

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Answer:

A. Chemical composition of the star

Explanation:

'Each element absorbs light at specific wavelengths unique to that atom. When astronomers look at an object's spectrum, they can determine its composition based on these wavelengths' - astronomy.com

'Atomic emission spectra are unique spectra of light emitted by an element when electricity is run through it or when it is viewed through a prism. Because they are unique, they can act as an element s fingerprint' - brightstorm.com

Answer:

The science of spectroscopy is quite sophisticated. From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star. The width of the line can tell us how fast the material is moving.

Viscosity  is the experimental parameter used to assess a liquid's resistance to flow.

Viscosity is the ability of a fluid (liquid or gas) to resist changing its shape or allowing nearby parts to move in relation to one another. Viscosity is a sign of flow resistance.

The fluidity, a metric indicating the ease of flow, is the reciprocal of viscosity. For instance, molasses is more viscous than water.

The viscosity of a liquid is a significant metric because the user may interpret it as a gauge of quality; in some cases, a thicker liquid may be perceived as having higher quality than a thinner one.

The texture of food also has a property called viscosity.

Therefore, viscosity  is the experimental quality that serves as a measure of resistance to flow of a liquid.

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In each question we need to balance the charge to get formula

[tex]Al(CN)_{3}[/tex]) Aluminum Cyanide

[tex]CaSO_{4}[/tex] Calcium Sulfate

[tex]LINO_{3}[/tex] Lithium Nitrate

[tex]NH_{4} CL[/tex] Ammonium Chloride

Ionic interaction is the attractive force between ions with opposite charges. Also called an ionic bond, it is the force that holds ionic compounds together. Like charges repel and opposite charges attract.

Intermolecular interactions occur between molecules or atoms that are not connected by bonds. Molecular interactions include cohesion (like-like attraction), adhesion (like-like attraction), and repulsion between molecules.

Divide the molar mass of the compound by the molar mass of the molecular formula. The result will be an integer or very close to an integer. Multiply all subscripts of the molecular formula by the integers found in step 2. The result is the sum formula

Hence, the result will be the sum formula

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Oxygen (O₂) is the limiting reactant.

Balanced chemical equation for reaction of disilane with oxygen:

2Si₂H₆ + 7O₂ → 4SiO₂ + 6H₂O.

Word equation: disilane + oxygen → silicon dioxide + water.

n(Si₂H₆) = 8.4 mol; amount of disilane

n(O₂) = 15.1 mol; amount of oxygen

From balanced chemical equation: n(Si₂H₆) : n(O₂) = 2 : 7

mole ratio for disilane = 8.4 mol / 2 = 4.1 mol

mole ratio for oxygene = 15.1 mol / 7 = 2.15 mol

Oxygen is the limiting reactant, because it has smaller mole ratio than disilane.

Limiting reactant determine amount of the product formed in a reaction.

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Ionic bonds and hydrogen bonds rely on the attraction of positive and negative charges.

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