the unknown metal ion gave a violet flame test, no precipitate with ammonium carbonate. what is the unknown metal?

Answer:  2 protons

Explanation:

The element number, 2 for He, is the number of protons in the nucleus.  The 4.0026 is the average atomic mass of He.

Answer:

No

Explanation:

Gelatin is a substance that makes jello, and a fruit cup is a cup full of fruit

Answer:

no

Explanation:

Answer:

Explanation:

16.7 inches [1 foot / 12 inches] [1 yard / 3 feet] Notice how the units cancel each other out. You do have numbers in the denominator. What you get, looks like this

16.7

------

(12 * 3)

16.7 / 36

0.4639 yrds

Answer :electrostatic repulsion.

EXPLANATION

Valence shell electron pair repulsion theory, or VSEPR theory, is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms

Answer:

VSEPR Is a model used to protect 3D molecular geometry based on a number of valence shell electron bond pairs among the atoms in a molecule or ion.

Explanation:

The water particles in a beaker of water experience unequal attractive forces due to the difference in the nature of interactions between water molecules within the liquid and at the surface.

Inside the bulk of the liquid, water molecules are surrounded by neighbouring water molecules, resulting in strong cohesive forces between them. These cohesive forces arise from hydrogen bonding, where the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds contribute to the overall stability and structure of the liquid.

At the surface of the water, however, water molecules experience an imbalance of attractive forces. Since there are no water molecules above the surface, the water molecules at the surface are not fully surrounded by other water molecules. As a result, the attractive forces between water molecules at the surface are stronger towards the inside of the liquid compared to the outside.

This imbalance leads to a net inward force on the surface water molecules, causing them to be pulled back into the liquid. This phenomenon is known as surface tension. Surface tension allows water to form droplets and exhibit behaviours such as capillary action.

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Answer:

0.485mol/kg

Explanation:

Molality is defined as the ratio of the number of moles of a solute to the kilogram of a solvent which is usually water.

Mass of NaBr = 10g

Molar mass of NaBr= 23+80=103g/mol

Mole of NaBr = mass / molar mass=10g/103g/mol= 0.097mol

Molality= Mole of a solute/ mass of solvent in kg

Mole of a solute( NaBr)= 0.097mol; mass of solvent( water in kg)= 200g. To convert to kg: 200g/1000g= 0.2kg

Molality = 0.097mol/0.2kg = 0.485mol/kg

The one factor that often most dramatically influences the rate of the SN² is the solvent in which the reaction will takes place.

The rate of the SN² reaction is significantly influenced by factor that  the solvent in which the reaction will takes place. The use of the protic solvents  such as the water or the alcohols, with the hydrogen bond donating capability will decreases the power of  nucleophile through the strong solvation.

The  SN² reactions are the faster in the polar, aprotic solvents than those that has the lack of hydrogen bond donating capability. Increasing the concentration of the either of the nucleophile or the substrate will increases the reaction rate.

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The balanced chemical equation is as follows: 2 Al2(Cr2O7)3 + 3 (NH4)3PO4 → 6 AlPO4 + 6 (NH4)2Cr2O7

To balance the chemical equation Al2(Cr2O7)3 + (NH4)3PO4 - AlPO4 + (NH4)2Cr2O7, we need to make sure that the same number of atoms of each element appears on both the reactant and product sides. To do this, we can follow a three-step process: Step 1: Count the number of atoms of each element on the reactant and product sides.
Reactants: - Al: 2
- Cr: 6
- O: 21
- N: 3
- H: 12
- P: 1
Products: - Al: 1
- Cr: 2
- O: 18
- N: 2
- H: 12
- P: 1

Step 2: Balance the atoms of each element by adding coefficients to the molecules.
Reactants: 1 Al2(Cr2O7)3 + 3 (NH4)3PO4
Products: 1 AlPO4 + 1 (NH4)2Cr2O7
Step 3: Check that the number of atoms of each element is balanced on both sides.
Reactants: - Al: 2
- Cr: 6
- O: 21
- N: 9
- H: 36
- P: 3
Products: - Al: 2
- Cr: 6
- O: 21
- N: 9
- H: 36
- P: 3
Therefore, the balanced chemical equation for Al2(Cr2O7)3 + (NH4)3PO4 - AlPO4 + (NH4)2Cr2O7 is: 1 Al2(Cr2O7)3 + 3 (NH4)3PO4 - 2 AlPO4 + 1 (NH4)2Cr2O7.

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Answer:

0.24 g/ml

Explanation:

By definition, density is defined as mass/unit volume (e.g., g/ml or g/cm^3, kg/m^3, oz/in^3 = etc.).

65 g

25.0 ml

(6.0 grams)/(25.0 ml) = 0.24 g/ml (to 2 sig figs)

Answer:sulfer by itself is not pleasant and it can be dangerous by itself but in large amounts.

Explanation:

Answer:

True.

Explanation:

Also did you know that it is combined with chlorine that it becomes salt? Cool right? Two deadly things combining to become a condiment

Answer:

The temperature at which the vapor pressure of a liquid is just equal to the external ... The conversion of a liquid to a gas below the boiling point is called ... equilibrium temperature of the mixture was 36.0 °C. What is the specific heat (J/ g°C) of the metal

Explanation:

Answer:

C 50 percent

Explanation:

A. 0 percent

the moon and the sun aren't lined up on a new moon.

Answer:

Lithium Iodide , Sodium Fluoride, Sodium Chloride, Sodium Bromide , Sodium Iodide, Potassium Fluoride  and Potassium Chloride are the examples of ionic compounds.

Explanation:

Ionic compounds have bonds that require the most energy to break because of strong attractive force between them. According to scientists, about 700 to 4000 Kilo Joules energy is required to break bonds between ionic compounds whereas 800 to 1000 kilo joules energy is needed by the compounds having covalent triple bonds. So ionic compounds needs the most energy to break.

The initial amount of iodine-125 in a 500mg sample is not provided. Therefore, the only way to find the mass remaining after 300 days is to make use of the half-life and the concept of exponential decay.

The general formula for the amount remaining after time t is given by:

A(t) = A₀(1/2)^(t/h)

where A₀ is the initial amount, t is the time elapsed, h is the half-life, and A(t) is the amount remaining after time t.

In this case, we have h = 60 days and t = 300 days.

Substituting these values into the formula above, we get:

A(300) = A₀(1/2)^(300/60)A(300) = A₀(1/2)^5A(300) = A₀(1/32)

Therefore, the mass remaining after 300 days is 1/32 times the initial mass.

If we let x be the initial mass, then the mass remaining is (1/32) x

The problem states that the answer should be given in milligrams, so we must convert the mass remaining to milligrams. If the initial mass is x milligrams, then the mass remaining is:(1/32) x milligrams.

The answer is 15.625 mg.

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The element that we can be able to use for the experiment in place of potassium is sodium.

We know that the elements that can be found in the same group does react in the same way. Now we know that we have to look about among the options so that we would be able to know element that is in the same group as potassium.

Given that both sodium and potassium are members of group 1, we have to look out for the element that element thus we have to select sodium.

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A covalent bond will be formed when two atoms are each trying to take each others electrons. Option A

A covalent bond is a type of chemical bond that involves the sharing of electrons between atoms. In a covalent bond, two or more atoms share one or more pairs of electrons to achieve a more stable electron configuration.

The strength of a covalent bond depends on a variety of factors, including the number of shared electrons, the distance between the atoms, and the electronegativity of the atoms involved. Covalent bonds are very strong, and they play a crucial role in the formation of molecules and compounds in chemistry.

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Answer:

Solid- Definite shape

Solid and Liquid- Definite volume, Not easy to compress, if at all

Gas- No Definite Volume

Liquid and Gas- No Definite shape

The characteristics for each phase of matter in the table where it belongs are as follows:

The states of matter may be defined as the three distinct physical forms which matter can take in most environments. They are as follows:

Each of the states of matter significantly possesses specific chemical and physical properties. For example, solids generally have a definite volume, are relatively rigid, and atoms or molecules are attached to each other very compactly.

Liquids possess a definite volume and have the ability to alter their shape through flowing. The atoms are loosely bonded to one another.

Gas has no definite volume or shape. This state of matter is easily compressed as well.

Therefore, the characteristics for each phase of matter in the table where it belongs are well described.

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When a polypeptide is being assembled, the bond that forms between a newly added amino acid and the previous amino acid in the chain is a peptide bond.

During protein synthesis, amino acids are linked together to form a polypeptide chain. The bond that forms between the carboxyl group of one amino acid and the amino group of another amino acid is called a peptide bond. This bond is formed through a dehydration synthesis reaction, also known as a condensation reaction.

In a dehydration synthesis reaction, a water molecule is removed as the peptide bond forms between the amino acids. The carboxyl group of one amino acid reacts with the amino group of another amino acid, resulting in the formation of a peptide bond and the release of a water molecule.

The peptide bond is a covalent bond and it forms a strong linkage between the adjacent amino acids in the polypeptide chain. It is responsible for the linear arrangement of amino acids in proteins. The amino acid sequence, determined by the order of peptide bonds, plays a crucial role in determining the protein's structure and function.

In summary, the bond that forms between a newly added amino acid and the previous amino acid in a polypeptide chain is a peptide bond, which is formed through a dehydration synthesis reaction.

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a)the number of moles of CaCO3 used is approximately 0.005096 mol. b) the molarity of solution is approximately 0.02038 M. c) the number of moles of the solution is approximately 5.095 × 10^(-4) mol.

a. To find the number of moles of CaCO3 used, we need to divide the given mass by the molar mass of CaCO3.

Given:

Mass of CaCO3 = 0.5100 g

Molar mass of CaCO3 = 100.1 g/mol

Number of moles of CaCO3 = Mass / Molar mass

Number of moles of CaCO3 = 0.5100 g / 100.1 g/mol

Number of moles of CaCO3 ≈ 0.005096 mol (rounded to 4 decimal places)

b. To determine the molarity of Ca^2+ in the 250 mL of solution, we need to use the number of moles of CaCO3 and the volume of the solution.

Given:

Number of moles of CaCO3 = 0.005096 mol

Volume of solution = 250.0 mL = 0.250 L

Molarity of Ca^2+ = Number of moles / Volume

Molarity of Ca^2+ = 0.005096 mol / 0.250 L

Molarity of Ca^2+ ≈ 0.02038 M

c. To calculate the number of moles of Ca^2+ in a 25.0-mL aliquot of the solution, we can use the molarity of Ca^2+ obtained in part (b) and the volume of the aliquot.

Given:

Molarity of Ca^2+ = 0.02038 M

Volume of aliquot = 25.0 mL = 0.025 L

Number of moles of Ca^2+ = Molarity × Volume

Number of moles of Ca^2+ = 0.02038 M × 0.025 L

Number of moles of Ca^2+ = 5.095 × 10^(-4) mol

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Answer:

In biology and medical research, the term "titre" refers to the concentration of a substance in a solution, usually expressed as the highest dilution or concentration at which a specific reaction occurs.

The term "consistent titres" generally refers to the reproducibility of titration results. It means that when a substance is repeatedly tested using the same method, the resulting titres are very similar or identical.

Consistent titres are important in many areas of biology and medicine, particularly in the diagnosis and monitoring of diseases. For example, when testing for antibodies against a particular virus or bacterium in a patient's blood sample, consistent titres over time can help indicate the progress of the disease or the effectiveness of treatment.

Overall, consistent titres are an important aspect of accurate and reliable experimental results, and they can provide valuable information in various fields of research.

Approximately 13.7 grams of CaBr2 are required to prepare 376 mL of a 0.183 M solution.

To calculate the mass of CaBr2 required to prepare a 0.183 M solution, we need to consider the molar mass of CaBr2 and the desired volume and concentration of the solution. The molar mass of CaBr2 is approximately 199.89 g/mol.

First, we convert the given volume of the solution to liters by dividing 376 mL by 1000, which gives 0.376 L.

Next, we use the formula Molarity = moles/volume to find the number of moles of CaBr2 in the solution. Rearranging the formula, moles = Molarity * volume, we have (0.183 mol/L) * (0.376 L) = 0.0687 moles.

Finally, we calculate the mass of CaBr2 by multiplying the moles by the molar mass: (0.0687 moles) * (199.89 g/mol) = 13.73 g.

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Answer:

Mechanical Energy to Thermal Energy

When you strike a match, it moves through the air until it rubs against a surface. The rubbing produces the heat required to light the match. This is a transformation from mechanical energy to thermal (heat) energy.

Explanation:

Answer:

A is the answer.

Explanation:

Answer:

it's an acid

Explanation:

because itis soda

TLC means Thin Layer Chromatography. It is a method that can best be described as "Affinity-Based" used in the separation of compounds that are in a mixture.

Unreacted p-nitrobenzaldehyde is simply an organic aromatic compound that contains a nitro group para-substituted to an aldehyde. in this case, if it is unreacted, that means it is the same as before the chemical reation.

Note that the question is missing key information hence the general answer.

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Answer:

Structural formula shows the atoms and bondsin an organic compound.

Explanation:

Structural formula of methane shows

1 Carbon atom is singly bonded to 4 hydrogen atoms.

Answer:

Which half-reaction equation represents reduction?

answer is 2

Answer:

B CU2+ +2e- -> Cu

Explanation:

reduction means something opposite of the word

reduction means an electron is GAINED in the part before the arrow

it's the " + 2e- " part of the equation before the arrow or "->" part

oxidation is the LOSING of an electron so it would show up to the right of arrow or "->" of the equation as "+2e-"

both reduction & oxidation reactions are called "redox"

in a battery

anode is oxidation

cathode is reduction

anode is positive

cathode is negative electrode

decomposing compounds is electrolysis.

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Answer:

The nucleus contains protons and neutrons. Protons have a positive charge and neutrons have no charge. Therefore, the overall charge of the nucleus is positive. Remember that electrons (particles with negative charges are located outside of the nucleus, in the electron clouds).

hope this helps! <3

The nucleus of an atom consists of protons and neutrons. The proton has a  positive charge (+1) while the neutron is neutral (0). This makes the charge of the nucleus overall positive.

Answer:

Atoms that contain an unstable combination of neutrons and protons, or excess energy in their nucleus.

Explanation:

cuz

The total entropy change is 1.036 JK/K

Entropy means the unavailable energy associated with the system. The entropy generation for the reversible cycle is zero and for irreversible cycle, it is positive. We can also understand entropy to be randomness of a system, Randomness is maximum in gaseous state and least in solid state.

The given data; the amount of heat transferred by the thermal reservoir is Q = 100KJ. Temperature of the high thermal reservoir is \(T_{h}\) = 1150k.

The temperature of the low thermal reservoir is \(T_l\) = 600K.

\(d_{s}\) = -Q + Q

        \(T_{h}\)   \(T_{l}\)

Substituting the formula we get

\(d_{s}\) = - 100KJ   +  1OOKJ

        1150K         600K

= 1.036 KJ/K

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