If 10. 5 g of nan3 decomposes, what theoretical mass of sodium, na, should be produced? if only 2. 84 g of na is collected, what is the percent yield?

decay rate of approximately 1.69x10^17 Bq (becquerels),

The decay rate of a radioactive sample is determined by the number  of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.

To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.

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The new volume of the balloon when cooled to 21°C is approximately 2.02 L.

To solve this problem, we can use the ideal gas law;

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas in Kelvin.

Since the problem gives us the volume of the balloon at two different temperatures, we can set up a ratio of the volumes and temperatures;

(V₁/T₁) = (V₂/T₂)

where V₁ and T₁ are the initial volume and temperature, and V₂ and T₂ are the final volume and temperature.

We are given that the initial volume is 2.53 L and the initial temperature is 44°C. We need to convert the temperature to Kelvin by adding 273.15:

T₁ = 44°C + 273.15

= 317.15 K

Now, final volume at a temperature of 21°C, which is;

T₂ = 21°C + 273.15

= 294.15 K

Now we can solve for V₂;

(V₁/T₁) = (V₂/T₂)

V₂ = (V₁/T) × T₂

V₂ = (2.53 L / 317.15 K) × 294.15 K

V₂ = 2.02 L

Therefore, the new volume of the balloon is 2.02 L.

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Answer:

A. 7.56

b. 57.12

Explanation:

Hope that's right have a nice day :)

The balanced nuclear equations for the following:(a) Formation of ⁵²Mn through positron emission is (48,23)V -> (0,+1)e + (48,22)Mn

A nuclear reaction is generally expressed by a nuclear equation, which has the general form, where T is the target nucleus, B is the bombarding particle, R is the residual product nucleus, and E is the ejected particle, and Ai and Zi (where I = 1, 2, 3, 4) are the mass number and atomic number, respectively. Finding a well balanced equation is critical for understanding nuclear reactions. Balanced nuclear equations provide excellent information about the energy released in nuclear reactions. Balancing the nuclear equation requires equating the total atomic number as well as the total mass number before and after the reaction using the rules of atomic number and mass number conservation in a nuclear reaction.

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The mass percent of iron in the 500-gram iron ore sample is 48.4%.

To calculate the mass percent of iron in the 500-gram iron ore sample, you can use the following formula:

Mass percent = (mass of iron / total mass of sample) × 100

In this case, the mass of iron is 242 grams and the total mass of the sample is 500 grams. So the calculation is:

Mass percent = (242 grams / 500 grams) × 100

Mass percent = 0.484 × 100

Mass percent = 48.4%

Therefore, in the 500-gram iron ore sample, the mass percent of iron is 48.4%.

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Answer:

I believe it would be (nucleus)

Answer:

Both b/c a chemical formula tells you how many and a sketch formula shows how they are bonded together.

Molecular formulas show how many atoms of each element one molecule of a compound contains. Note: Ionic compounds are generally crystalline solids with high melting points. Other compounds, however, have very different properties.

The sketch of the molecule like in the structural formula provides more information than the chemical formula of the molecule.

A structural formula can be described as a representation of a molecule that involves the arrangement of atoms and chemical bonds of a molecule. The structural formulas contain elemental symbols that represent the atoms that are connected by lines that represent the chemical bonds.

One line depicted a single covalent bond, whereas two and three lines represent double and triple bonds respectively. Molecular formulas can be described as a representation of the number of atoms of each element in a molecule.

For example, the molecular formula for water is H₂O and the molecular formula of isopentane is C₅H₁₀.

Molecular formulas do not show how the atoms of the elements are bonded together. Structural formulas represent that how exactly each atom is bonded to another atom. Therefore, the Structural formula provides more information about molecule.

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The new volume of the gas is 2.38 L when the temperature is raised to 80°C and the pressure is increased to 245 kPa.

Given:

P1 = 110 kPa

V1 = 4.00 L

T1 = 30°C = 30 + 273.15 K = 303.15 K

P2 = 245 kPa

T2 = 80°C = 80 + 273.15 K = 353.15 K

Use the combined gas lawc, which states:

(P1V1) / (T1) = (P2V2) / (T2)

Where:

P1 and P2 are the initial and final pressures, respectively.

V1 and V2 are the initial and final volumes, respectively.

T1 and T2 are the initial and final temperatures, respectively.

Substitute these values into the equation:

(110 kPa × 4.00 L) / (303.15 K) = (245 kPa × V2) / (353.15 K)

Now, let's solve for V2:

(110 kPa × 4.00 L × 353.15 K) = (245 kPa × V2 × 303.15 K)

(176860 kPaLK) = (74235 kPa × V2 × K)

Dividing both sides by 74235 kPa × K:

(176860 kPaLK) / (74235 kPa × K) = V2

V2 = 2.38 L

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The net charge of the predominant form of Arg at pH 1.0 is +2, At pH 5.0 is +1, At pH 10.5 is 0 and At pH 13.5 is -1.

A pH less than 7 indicates acidity, while a pH greater than 7 indicates basicity or alkalinity. The pH scale is logarithmic, meaning that each unit change represents a tenfold change in acidity or basicity.

The pH of a solution can have significant impacts on chemical and biological processes. Many enzymes and other biological molecules have specific pH ranges in which they function optimally. Changes in pH can affect the solubility, stability, and reactivity of many substances.The pH of a solution can be measured using pH meters or pH indicator papers. pH can also be adjusted using buffers, which are solutions that can resist changes in pH by neutralizing added acid or base.

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The amount of solid required to saturate the water is  0.28g

What do you mean by solubility?

The creation of a new bond between the molecules of the solute and the solvent is known as solubility.

Given:

weight of salt = 60 gram,

solubility = 48/100 = 0.48

Formula used

solubility of solute =weigh of  solute in saturated solution/weight of solvent in saturated solution×100

Let weight of the solute = x

By using formula

X =  0.48*60/100 = 0.28g

Hence, weight of solute in saturated solution = 0.28g

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Answer:

See Explanation

Explanation:

Volume of base used  = (31.79 - 1.6) + (32.12 - 0.98) + (42.87 -13.21)/3 = 30.34 cm3

Volume of acid used = (24.86 - 0.42) + (24.11 - 0.11) + (27.67 -3.42)/3 = 24.23 cm3

For trial 1= number of moles of HBr = 24.44/1000 * 0.3 = 0.0073 moles

For trial 2= number of moles of HBr = 24/1000 * 0.3 = 0.0072 moles

For trial 3= number of moles of HBr = 0.0089 moles

HBr(aq) + KOH(aq) -----> KBr(aq) + H2O(l)

One mole of base is required to neutralize one mole of acid.

From CAVA/CBVB =nA/nB

CAVAnB = CBVBnA

CB = CAVAnB/VBnA

CB = 0.3 * 24.23 * 1/30.34  * 1

CB = 0.24 moldm-3

number of moles of KOH = concentration * volume

number of moles = mass/molar mass

molar mass of KOH = 56 g/mol

mass/56 =  0.24 * 30.34/1000

mass = 0.24 * 30.34/1000 * 56

mass =0.408 g of KOH

Answer:

1.) The result is a red solution and a blue-green precipitate.

2.) The reaction results in a precipitate of a basic salt, which can co-precipitate with other metal ions that form hydroxide precipitates, causing complications when trying to separate metal ions.

the answer to the first question is:

Here, cobalt(II) chloride (CoCl2) is added to sodium hydroxide (NaOH).

and I dont know the answer to the second one sorry

Answer:

there are 4

Explanation:

Electron and proton attract each other.

Two electrons will repel each other.

An electron is a negatively charged subatomic particle that can be either sure to an atom or free (no longer certain). An electron this is certain to an atom is one of the three primary varieties of particles inside the atom -- the other  are protons and neutrons. collectively, electrons, protons and neutrons shape an atom's nucleus.

A proton is a subatomic particle observed inside the nucleus of each atom. The particle has a positive electric price, same and opposite to that of the electron. If remoted, a single proton could have a mass of best 1.673 ? 10-27 kilogram, simply barely much less than the mass of a neutron.

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The heat energy required to melt 13.00 kg of ice at 273 K is 4368000 J

Q = mL

Where

With the above formula, we can determine the heat required to melt the ice. detail below:

The heat energy needed to melt the ice can be obtained as illustrated below:

Q = mL

Q = 13 × 3.36×10⁵

Q = 4368000 J

Thus, the heat energy required to melt 13.00 kg of ice at 273 K is 4368000 J

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1. The ionic bond and covalent bond are distinguished from each other based on the way the atoms are attached to each other. Ionic bonds are formed when one or more electrons are transferred from one atom to another, resulting in a cation and an anion attracting each other to form an ionic bond. Ionic bonds are a result of electrostatic attraction between ions with opposite charges. Covalent bonds are formed when atoms share one or more pairs of electrons to achieve stable electronic configurations. Covalent bonds form when two or more atoms share electrons in order to achieve the stable electron configuration of noble gases. In covalent bonding, the electrons are shared between atoms, not transferred.

2. Density is defined as mass per unit volume. The density of sugar in g/cm³ is obtained by dividing its mass by its volume.

Mass of sugar = 500gVolume of sugar = 0.315L

Using the formula for density, we have

Density = Mass/Volume= 500g/0.315

L= 1587.30 g/L1

L = 1000 mL1 mL = 1 cm³

Density = 1587.30 g/L × (1 mL/1 cm³)

Density = 1.5873 g/cm³, to 4 significant figures

3. We can use the formula; Density = Mass/Volume, to calculate the mass of the block of silicon. Volume of block of silicon = 450 m³ Density of silicon = 2.336 g/cm³ Volume of block of silicon = 450 m³ = 4.5 × 10^8 cm³

We can substitute the values into the formula

Density = Mass/Volume

2.336 g/cm³ = Mass/4.5 × 10^8 cm³

Mass = 2.336 g/cm³ × 4.5 × 10^8 cm³

Mass = 1051200000 g or 1.05 × 10^9 g, to 2 significant figures.

Therefore, the mass of the block of silicon is 1.05 × 10^9 g.

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Answer:

Rate of change of velocity in time

The balanced chemical reaction is Al + 3AgNO3 → Al (NO3)3 + 3Ag.

A balanced chemical equation though has the identical number of atoms from every type inside the reaction on both the reactant chemical equation output sides. In a balanced chemical equation, both the mass and the change were equal.

An organic organization may adjust to changes in its surroundings very easily. It is distinguished by low complexity, low centralization, as well as low formalization. A mechanistic organization, on the other hand, is distinguished by great complexity, high centralization, as well as high formalization.

Thus, the balanced chemical reaction will be Al + 3AgNO3 → Al (NO3)3 + 3Ag.

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LiCl (lithium chloride) is an ionic compound and would not be expected to interact strongly with NH3 through intermolecular forces, The correct answer is A. CH4.

NH3 (ammonia) can experience several intermolecular forces, including dispersion forces, dipole-dipole forces, and hydrogen bonding. However, the strength of these forces depends on the nature of the other molecules present in the system.

Of the compounds given, only CH4 (methane) is nonpolar, meaning it only experiences dispersion forces with other nonpolar molecules. NH3 can also experience dipole-dipole forces with polar molecules, such as CH3Br (methyl bromide) and CH3OH (methanol), and hydrogen bonding with compounds that have a hydrogen atom bonded to a highly electronegative atom, such as HOF (hypofluorous acid) and water.

LiCl (lithium chloride) is an ionic compound and would not be expected to interact strongly with NH3 through intermolecular forces. Therefore, option B is not the correct answer.

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Answer:

Explanation: An acid is a substance or compound that releases hydrogen ions (H+) when in solution. In a strong acid, such as hydrochloric acid (HCl), all hydrogen ions (H+), and chloride ions (Cl-) dissociate (separate) when placed in water and these ions are no longer held together by ionic bonding.

Beans are processed through 'nibbing'. During the nibbing process, the roasted cocoa beans are crushed and ground into a paste called cocoa mass or cocoa liquor.

This cocoa mass can then be further processed to separate the cocoa solids from the cocoa butter, which is the fat component of the cocoa bean. The separated cocoa solids and cocoa butter are used in the production of chocolate. Pure cocoa mass (cocoa paste) in solid or semi-solid form is known as chocolate liquor. It includes about equal amounts of cocoa butter and solid cocoa, much like the cocoa beans (nibs) from which it is made. It is made from fermented, dried, roasted, and separated from their skins cocoa beans. To make cocoa mass (cocoa paste), the beans are pulverised.

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Explanation:

The speed at which a planet orbits the Sun changes depending upon how far it is from the Sun. When a planet is closer to the Sun the Sun’s gravitational pull is stronger, so the planet moves faster. When a planet is further away from the sun the Sun’s gravitational pull is weaker, so the planet moves slower in its orbit.

Answer:

I don't really understand, but here is my answer:

Tectonics plates can move back and forth, side to side, and into each other which causes earthquakes.

Hope this helps!

Sky

The metric prefixes which is not one multiple of ten when moving forward or backward between prefixes is: none of the above

Option c is the correct answer

A metric prefix simply refers to a unit prefix that precedes a basic unit of measure to indicate a multiple or sub-multiple of the unit.

So therefore, the metric prefixes which is not one multiple of ten when moving forward or backward between prefixes is: none of the above

Complete question:

Which of the following metric prefixes are not one multiple of ten when moving forward or backward between prefixes?

a. micro

b.nano

c. none of the above

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Answer:

0.020g de sulfato de plomo se requieren

La concentración de la solución diluida es de 3ppm

Explanation:

Las partes por millón (ppm) son definidas como:

miligramos soluto / 1L solución.

Si deseas preparar una solución a 100ppm de sulfato de plomo (II) necesitas 100mg de este sulfato en 1L. En 200mL = 0.200L vas a necesitar:

0.200L × (100mg / 1L) = 20mg de sulfato de plomo (II).

Como 1000mg = 1g,

20mg × (1g / 1000mg) = 0.020g de sulfato de plomo se requieren.

Ahora, se van a tomar 30mL de esta solución y se diluirán a 1000mL. Se diluye la solución:

1000mL / 30mL = 33.33 veces.

Como la solución inicial es de 100ppm, esta dilución genera una solución de concentración:

100ppm / 33.33 = 3ppm

Answer:

an acid +metal =salt +hydrogen

Explanation:

HCL+Mg =Mgcl2+H2

(because Mg has an ion with a +2 charge ,it attracts Cl with a -2 charge )

therefore the correct answer is D for the above reasons

Answer:

When magnesium reacts with hydrochloric acid (HCl), a single-replacement reaction occurs. These reactions involve the substitution of one element in a compound with another. In this case, the hydrogen in HCl will be swapped with the magnesium metal because both of these elements make cations (positively-charged ions) when they participate in ionic bonding.

So why does the chorine have a subscript of 2 when it bonds with magnesium? This occurs in order to balance the ionic charges and make the overall compound neutral.

Magnesium wants to give away 2 electrons when it ionizes, forming the cation Mg²⁺. However, chlorine only wants to gain 1 electron to fill its valence shell, making it form the anion, Cl⁻. As you can see, if just one of each ion were to bond, the compound would have an overall charge of +1 because (+2 - 1 = +1). Therefore, the compound can be made neutral if two chlorine ions bond with just 1 magnesium ion (+2 - 1 - 1 = 0).

The hydrogen ion from HCl becomes H₂ after the reaction occurs. This occurs because hydrogen generally exists as a diatomic compound in nature (diatomic = exists as 2 atoms).

The complete balanced equation for the reaction is:

Mg + 2 HCl  ------> MgCl₂ + H₂