Which metal is most likely to form more than one kind of positively charged ion?
A.Sodium
B.Barium
C.Nickel
D.Magnesium

Looking at the density of the penny which is 7.1347 g/cm³, it can be concluded that it is not made from copper.

It is the ratio of the mass of a substance to its volume.

Mathematically; density = mass/volume

In this case, the mass of the coin is 2.49 g, and the volume is 0.349 cm³. Thus:

Density of coin = 2.49/0.349 = 7.1347 g/cm³

The density of copper is 8.96 g/cm³ at room temperature.

Hence, the penny is not made of copper.

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To solve this problem, we can use the formula:

q = m*c*ΔT, where q is the amount of heat energy absorbed by the gold, m is the mass of the gold, c is the specific heat capacity of gold, and ΔT is the change in temperature of the gold.

We are given the mass of gold (m = 4.1 g), the specific heat capacity of gold (c = 0.130 J/g °C), and the amount of energy used to heat the gold (q = 52.2 J). We are asked to find the final temperature of the gold (ΔT).

Rearranging the formula, we get:
ΔT = q/(m*c)
Substituting the values we know, we get:
ΔT = 52.2 J / (4.1 g * 0.130 J/g °C)
ΔT = 98.92 °C
This is the change in temperature of the gold. To find the final temperature, we add this to the original temperature of 25.0°C:
Final temperature = 25.0°C + 98.92°C
Final temperature = 123.92°C
Therefore, the final temperature of the gold is 123.1°C.

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Answer:

during compression, the volume (V) of a gas decreases. When this happens, the pressure (P) of the gas increases if the number of moles (n) of gas remains constant. If you keep the pressure constant, reducing the temperature (T) also causes the gas to compress.

Explanation:

The equilibria studied in the lab procedure include sodium chloride and potassium iodide.

Sodium chloride (NaCl) and potassium iodide (KI) are both ionic compounds that are soluble in water. When they are dissolved in water, they dissociate into their constituent ions.

NaCl dissociates into sodium ions (Na+) and chloride ions (Cl-), while KI dissociates into potassium ions (K+) and iodide ions (I-)

When solutions of NaCl and KI are mixed together, the following reaction takes place:

NaCl + KI → NaI + KCl

The products of this reaction are sodium iodide (NaI) and potassium chloride (KCl).

This reaction is a double displacement reaction, also known as a metathesis reaction, where the cations and anions of two different ionic compounds exchange places to form two new ionic compounds.

The reaction can also be represented using ionic equations:

Na+ (aq) + Cl- (aq) + K+ (aq) + I- (aq) → Na+ (aq) + I- (aq) + K+ (aq) + Cl- (aq)

Overall, the reaction is a neutralization reaction because Na+ and K+ cations from NaCl and KI, respectively, switch partners with the I- and Cl- anions from KI and NaCl, respectively.

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Answer:

A) oxidizing agent is SO2

B) NaClO is the oxidizing agent

Explanation:

A) This is a redox reaction in which oxidation and reduction occur simultaneously.

Thus, in 2H2S(g) + SO2(g) -> 2H2O(l) + 3S(s);

H2S is reduced as follows;

H2S → S + 2H+ + 2e−

We can see that SO2 has been reduced while H2S gets oxidized since it has changed state from - 2 to 0 . Thus sulphur dioxide is the oxidizing agent.

B) SO2(g) + H2O(l) + NaClO(aq) -> NaCl(aq) + H2SO4(aq)

In this, SO2 undergoes oxidation and NaClO is the oxidizing agent

Answer:

The Correct IUPAC name is H3C - CH (CH3) - CH (C2H5) - (CH2)2 - CH3 Class 11

Explanation:

yes searched np is maybe right i not 100% sure i 50% is it right >:) tell if u got it right >:D

Answer:

4-ethyl-6-methyl-3-heptene

Explanation:

Longest chain is seven long so it is heptane

But there is a double bond, so that becomes heptene

The double bound starts on the third carbon, so it is 3-heptene (this tells us where the double bond is)

Now we just got to do the substituents!

There is a ethyl group of the fourth carbon and then a methyl group on the sixth!

Ergo, 4-ethyl-6-methyl-3-heptene

Answer:

12.5 mL NH₃

Explanation:

To find the volume of NH₃, you need to (1) find the moles (NH₄)₂PtCl₄ (using the molarity equation), then (2) convert moles (NH₄)₂PtCl₄ to moles NH₃ (via mole-to-mole ratio from balanced equation, and then (3) find the volume NH₃ (using the molarity equation).

(Step 1)

25.00 mL / 1,000 = 0.025 L

Molarity = moles / volume (L)

0.100 M = moles / 0.025 L

0.0025 = moles (NH₄)₂PtCl₄

(Step 2)

The unbalanced equation:

(NH₄)₂PtCl₄ + NH₃ ----> Pt(NH₃)₂Cl₂ + NH₄Cl

Reactants: 2 nitrogen, 11 hydrogen, 1 platinum, 4 chlorine

Products: 2 nitrogen, 10 hydrogen, 1 platinum, 3 chlorine

The balanced equation:

(NH₄)₂PtCl₄ + 2 NH₃ ----> Pt(NH₃)₂Cl₂ + 2 NH₄Cl

Reactants: 3 nitrogen, 14 hydrogen, 1 platinum, 4 chlorine

Products: 2 nitrogen, 14 hydrogen, 1 platinum, 4 chlorine

0.0025 moles (NH₄)₂PtCl₄              2 moles NH₃
----------------------------------------  x  ------------------------------  =  0.0050 moles NH₃
                                                      1 mole (NH₄)₂PtCl₄

(Step 3)

Molarity = moles / volume (L)

0.400 M = 0.0050 moles / volume

(0.400 M) x volume = 0.0050 moles

volume = 0.0125 L NH₃

0.0125 L x 1,000 = 12.5 mL NH₃

Answer:

C

Explanation:

because it is complete combustion so it will produced CO2 +H2O :)

An increase in blood carbon dioxide content causes hemoglobin to release more oxygen molecules. Details about hemoglobin can be found below.

Hemoglobin is the iron-containing substance in red blood cells that transports oxygen from the lungs to the rest of the body.

Hemoglobin consists of a protein (globulin) and heme (a porphyrin ring with an atom of iron at its centre). This justifies its oxygen affinity.

However, excess carbon dioxide in the blood causes blood pH to decrease, resulting in hemoglobin proteins releasing more oxygen molecules.

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Answer:

6x

Explanation:

Answer:

Δ

H

=

−

389 kJ

When the child sits on the partially filled balloon, the pressure of the balloon increases. The pressure change is a doubling of the initial pressure, indicating a factor of 2 increase.

When the child sits on a partially filled balloon, the volume of the balloon decreases by half. According to Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume at constant temperature, the pressure inside the balloon increases.

Let's consider the initial volume of the balloon as V and the initial pressure as P. When the volume decreases by half, it becomes V/2. Since the amount of gas remains constant, the pressure increases to maintain equilibrium. The new pressure can be denoted as P'.

According to Boyle's Law, P₁V₁ = P₂V₂, where P₁ and V₁ are the initial pressure and volume, and P₂ and V₂ are the final pressure and volume. Plugging in the values, we have P * V = P' * (V/2).

Simplifying the equation, we get P' = 2P. This means the pressure of the balloon increases by a factor of 2, or it doubles. So, the pressure change can be expressed as an increase of two times the original pressure.

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Answer:

C

Explanation:

Electrons are negatively charged with a charge of -1e. They can move between atoms while protons stay in the atom.

Number of particles : 8.603 x 10²³

Standard conditions for temperature and pressure are used as a reference in certain calculations or conditions

Assumption⇒ Standard Conditions

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.

1 mol = 6.02 x 10²³ particles (atoms, ions, or molecules)

32.0 liters of Helium

\(\tt mol=32:22.4=1.429\)

Number of particles :

\(\tt 1.429\times 6.02\times 10^{23}\\\\=8.603\times 10^{23}\)

Answer:

30

Explanation:

use the keep,change,change method.

19 + 11

19,keep, "-" change to addition, -11,change to positive

now use this

19 + 11 = (30 )

During the transamination process, the enzyme transaminases use Pyridoxal pyrophosphate as a cofactor.

All transamination reactions, as well as several amino acid oxylation and deamination processes, involve the coenzyme pyridoxal phosphate. The aminotransferase enzyme's epsilon-amino group of a particular lysine group forms a Schiff-base bond with the aldehyde group of pyridoxal phosphate.

The epsilon-amino group of the lysine residue in the active site is replaced by the alpha-amino group of the amino acid substrate. The ensuing intermediate, a quinoid, undergoes deprotonation to become an aldimine, which is then protonated to become a ketimine by accepting a proton in a different position. Ketamine undergoes hydrolysis, leaving the amino group on the protein complex intact.

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Diffraction occurs whenever a portion of a wavefront is obstructed by some opaque object.

There are 2 oxygen atoms in the compound Sr(OH)₂, and 9 sulfur atoms are in the compound Cr₂(SO₄)₃.

In the compound Sr(OH)₂, there is one strontium ion (Sr₂⁺) and two hydroxide ions (OH⁻). The formula for hydroxide ion is OH⁻, which means it contains one oxygen atom and one hydrogen atom. Therefore, there are a total of 2 oxygen atoms in the two hydroxide ions present in the compound.

In the compound Cr₂(SO₄)₃, there are two chromium ions (Cr₃⁺) and three sulfate ions (SO₄²⁻). The formula for sulfate ion is SO₄²⁻, which means it contains one sulfur atom and four oxygen atoms. Therefore, there are a total of 3 x 1 = 3 sulfur atoms present in each sulfate ion. Since there are three sulfate ions present in the compound, the total number of sulfur atoms is 3 x 3 = 9.

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--The given question is incomplete, the complete question is

"How many oxygen atoms are in the compound Sr(OH)₂ and How many sulfur atoms are in the compound - Cr₂(SO₄)₃"--

The three states of matter are solid - example is stone, liquid - example is water and gas - example is air.

A matter is referred to as a substance which has a certain mass and takes up a certain volume in space.

For example pen, pencil, toothbrush, water, milk are matters as well as car, bus, bicycle is also a matter. So matter is considered as a living thing and a non-living thing.

There are three states of matter and they include;

They have different properties, which can be explained by looking at the arrangement of their particles. This is the theoretical temperature at which particles have the least amount of energy and the slowest movement.

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The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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Answer:

This is true

Explanation:

Because motion can change due to its speen rate and direction change

Answer:

¹₀P

Explanation:

 Nuclear reaction:

                ⁹₄Be  + ⁴₂He  → ¹²₆C + ?

To balance this equation, as with other combining specie, the mass number on both sides of the expression must be the same. Also, the atomic number must be the same.

   Let us represent the unknown by X;

          ⁹₄Be  + ⁴₂He  → ¹²₆C + ᵇₐX

 Now;

  Sum of mass number;

            9 + 4 = 12 + b

               13 = 12 + b

                    b = 1

   Sum of atomic number;

             4 + 2  = 6 + a

               a = 0

So the specie is a position ¹₀P

Answer: 1) True

2) False 4)False 5)True

Explanation: I took a test that had similar questions

the molar solubility of marble (i.e., [ca2 ][ca2 ] in a saturated solution) in normal rainwater, for which Ph=5.60ph=5.60 is 0.0142.

A saturated solution is a solution that contains maximum amount of solute that can be dissolved under the condition at which the solution exists.

In chemistry, after studying solutions and properties of solution, one can understand that a solution can reach a status of saturation. This state is when solution has reached a point in which no more solute can be added. Addition of solute after this point would result in solid precipitate or gas being released. Such mixture is called a saturated solution.

Ksp of(CaCO3)= 4.5 x 10 -9

Ka1 for (H2CO3) =  4.7 x 10^-7

Ka2 for the (H2CO3) = 5.6 x 10 ^-11

1) The equation 1 for Ksp = 4.5 x 10^-9

CaCO3(s)→ Ca +2(a q)    +  CO3-2(a q)  

2) The equation 2 for Ka1 = 4.7 x 10^-7

H2CO3- + H2O → HCO3- + H3O+

3) equation 3 for Ka2 = 5.6 x 10^-11

HCO3-(a q) + H2O(l) → CO3-2 (a q)  + H3O+(a q)

so, form the equation 1& 2&3 we can get the overall equation:

CaCO3(s)  +  H+(a q)  → Ca2+(a q)   + HCO3-(a q)

note: you could get the overall equation by adding the equation 1 to the inverse of equation 3 as the following:

when inverse of equation 3 is :

CO3-2 (a q) + H3O+ (a q) ↔ HCO3- (a q) + H2O(l)  Ka2^-1 = 1.79 x 10^10

when we add it to the equation 1

CaCO3(s) ↔ Ca2+(a q)  +  CO3-2(a q)   Ksp = 4.5 x 10^-9

∴ overall equation will be as we have mentioned before:

when H3O+ = H+

CaCO3(s) + H+(a q)  ↔ Ca2+ (a q) + HCO3-(a q)   K= 80.55

from overall equation:

∴K = [Ca2+][HCO3-] / [H+]

when we have [Ca2+] = [HCO3-] we can assume both = X

∴K = X^2 / [H+]

when we have the PH = 5.6 we can get [H+]

PH = - ㏒[H+]

5.6 = -㏒[H]

∴[H] = 2.5 x 10^-6

so, by the substitution on K expression:

∴ 80.55 = X^2 / (2.5 x10^-6)

∴X = 0.0142

∴[Ca2+] = X = 0.0142.

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Answer:

A piece of gold foil was hit with alpha particles, which have a positive charge. Most alpha particles went right through. This showed that the gold atoms were mostly empty space. Some particles had their paths bent at large angles. A few even bounced backward. The only way this would happen was if the atom had a small, heavy region of positive charge inside it.

Answer: you just have to look at the periodic table and fill in the blanks

Explanation:

Ferromagnetic metals are those that naturally draw magnets; these magnets will adhere to such metals hard. Ferromagnetic metals are, for instance, iron, cobalt, steel, gold, manganese, gadolinium, & lodestone.

Ferromagnetic materials are common metals that exhibit a strong magnetic repulsion as a result of their high magnetic permeability. The term "magnetic permeability" refers to a material's induced magnetization brought on by the presence of a magnetic field.

The world's strongest magnetic material, Nd2Fe14b, is made of neodymium combined with iron, boron, and minute amounts of other elements like dysprosium and praseodymium.

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113.610×10³moles of Carbon dioxide.

A substance's molar mass is its mass in grams per mole of the compound. A mole is the measurement of the quantity of atoms, molecules, or ions in a substance. A mole is 6.022 1023 molecules of any given substance.

Avogadro's number of molecules (molecular compound) or formula units is found in one mole of a compound (6.022 x 1023) (ionic compound). You can determine the mass of 1 mole of a compound by looking at its molar mass. In other words, it provides the amount of grams in a compound per mole.

1dm³ = 1000ml

5000dm³ = 5000000ml

5000dm³ = 5×10⁶ml

5×10⁶ml = 5×10⁶g

CO₂,

Molar mass = 44.01g/mol

No of moles = 5×10⁶/44.01

No of moles = 113.610×10³moles.

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