Lead-214 undergoes beta decay. In addition to the beta particle, which product forms?

Answer:

C₂H₂O₄

Explanation:

Given parameters:

Mass of organic acid  = 5g

Mass of C  = 1.334g

Mass of O = 3.554g

Mass of H = 5  - (1.334 + 3.554)  = 0.112g

Molar mass  = 90.03g/mol

Unknown:

Molecular formula of the compound  = ?

Solution:

To solve this problem, we find the empirical formula of the compound first. It is the simplest formula of the compound.

Elements                        C                     H                        O

Mass                             1.334               0.112                   3.554

Molar mass                       12                   1                          16

Number of moles          1.334/12          0.112/1                 3.554/16

                                         0.112              0.112                     0.222

Divide by the

Smallest                         0.112/0.112        0.112/0.112          0.222/0.112

                                                1                       1                      2

           Empirical formula  = CHO₂  

The molar mass of this empirical formula  = 12 + 1 + 2(16) = 45g/mol

Now;

  Multiplication index  = \(\frac{90.03}{45}\)    = 2

Molecular formula  =  (CHO₂)₂    = C₂H₂O₄  

In a first order reaction,  plot of the logarithm of the concentration of reactants against the time gives a straight line graph.

The question is incomplete but I will try to help you as much as a I can. A first order reaction is one in which the rate of reaction depends on the concentration of only one reactant.

A plot of the logarithm of the concentration of reactants against the time gives a straight line graph.

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Answer:24435

Explanation w49439r chusb

Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.

Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.

Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.

Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.

Errors in measurements can be classified into two types: random errors and systematic errors.

Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.

Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.

In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.

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The final volume of diluted solution is 214.39 mL

From the question given above, the following data were obtained:

Molarity of diluted solution (M₂) = 0.7 M

Molarity of stock solution (M₁) = 6 M

Volume of stock solution (V₁) = 25 mL

M₁V₁ = M₂V₂

6 × 25 = 0.7 × V₂

150 = 0.7 × V₂

Divide both side by 0.7

V₂ = 150 / 0.7

Therefore, the volume of the diluted solution is 214.39 mL

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According to mole concept and Avogadro's number , there are 300.5 moles in 1.81×10²⁶ molecules of water.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

As 1 mole= 6.023×10²³ molecules ,therefore 1.81×10²⁶ molecules= 1.81×10²⁶ /6.023×10²³=300.5 moles.

Thus, there are 300.5 moles in 1.81×10²⁶ molecules of water.

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Energy is released during nuclear reactions. To calculate energy changes, use the attached image below. Nuclear reactions produce far more energy than other types of reactions, such as chemical reactions.

The term nuclear reaction is defined as a process in which two nuclei, or a nucleus and an external subatomic particle, collide to produce one or more new nuclides.

Normally, chemical reactions take place outside the nucleus. Nuclear reactions occur only within the nucleus. When chemical reactions occur, elements retain their identity, as do the nuclei of atoms.

Thus, in nuclear reactions, the nuclei of atoms undergo complete transformations, resulting in the formation of new elements.

The nuclear reactions are as follows:

Alpha decay - PO₈₄²°⁶⇒ ₈₂Pb²°⁶ + He⁴₂

Beta⁻ decay - Na²²₁₁ ⇒ Na ²²₁₀ + e°₋₁

Beta⁺ decay - Na²⁴₁₁ ⇒ Na₁₀²⁴ + e°₋₁+β

Gamma - CO⁶°₂₇ ⇒ Ni⁶⁰₂₆ + e°₋₁ +γ

Fission - U²³⁵₉₂ + n₀¹ ⇒ Ba¹⁴⁴₅₆ + Kr⁸⁹₃₆ +3n₀¹

Fusion- H₁² +H³₁ ⇒ He⁴₂ + n¹₀ +17.59MeV

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Answer: See explanation

Explanation:

Vacuum filtration is referred to as a fast filtration technique that is used in the separation of solids from liquids. It is also used to collect a desired solid. It basically uses a side-arm flask and a Buchner funnel.

Based on the question, the techniques that should be used to ensure a quantitative separation goes thus:

• Wet the filter paper before the mixture is poured into the filter funnel.

• Then, carefully rinse the flask with a little amount of water into the filter funnel.

• After that, the solid on the filter paper should be washed the with a small amount of water.

• Finally, Dry the solid on the filter paper when the separation is done.

Answer:

Ask a question based on an observation

Explanation:

hope this helps :)

Answer:

Helper

Explanation:

is the expaltin of the explatin

Answer:  19.54 grams H2H4 remain

Explanation:

The moles of each reagent are calculated by dividing the mass of each by its molar mass (g/mole).  

N2H4:  (93.1g/(32.0 g/mole) = 2.908 moles

N2O4:  (105.7g/92.0 g/mole) = 1.149 moles

The balanced equation says we need  one mole N2O4 per 2 moles N2H4.  This means the 1.149 moles of N2O4 will consume 2*(1.149 moles) = 2.298 moles of N2H4.  Since we start with 2.908 moles, (2.908 - 2.298) = 0.611 moles N2H4 will remain unreacted.  Bummer.  Multiply by the molar mass of N2H4 to obtain 19.55 grams unreacted N2H4.  

The volume (in mL) of 0.100 M Na₂CO₃ needed to produce 1.00 g of CaCO₃ is 100 mL

First, we shall determine the mole in 1.00 g of CaCO₃. Details below:

Mole = mass / molar mass

Mole of CaCO₃ = 1 / 100.09

Mole of CaCO₃ = 0.01 mole

Next, we shall obtain the mole of Na₂CO₃. Details below:

Na₂CO₃ + CaCl₂ -> 2NaCl + CaCO₃

From the balanced equation above,

1 mole of CaCO₃ were obtained from 1 mole of Na₂CO₃

Therefore,

0.01 moles of CaCO₃ will also be obtain from 0.01 mole of Na₂CO₃

Finally, we shall determine the volume of Na₂CO₃ needed. Details below:

Volume = mole / molarity

Volume of Na₂CO₃ = 0.01 / 0.1

Volume of Na₂CO₃ = 0.1 L

Multiply by 1000 to express in mL

Volume of Na₂CO₃ = 0.1  1000 =

Volume of Na₂CO₃ = 100 mL

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The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.

However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.

They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.

Thus, the correct option is A.

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Answer:

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Due to the fact that electrons are delocalized in graphite, it is a good conductor of electricity. Carbon atoms in graphite form hexagonal layers and are in covalent bonds with three other carbon atoms. Due to this non-bond electron configuration, each carbon atom conducts electricity in the form of a delocalized electron.

The correct measure of density is g/cm³ (option A)

Density is a measure of the mass of matter contained by a unit volume. The symbol most often used for density is ρ, although the Latin letter "D" can also be used.

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume.

The formula for density is d = M/V

where;

Density is commonly expressed in units of grams per cubic centimetre (g/cm³).

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Answer:

so 0.15 moles X 22.4 dm3/mole=3.36 dm3. Next we find the moles of hexane combusted, and then the moles of CO2. Finally, we find the volume of CO2 using the fact that at STP, 1 mole of gas = 22.4 dm3.

Answer:

True.

Explanation:

Since electromagnetic radiation travels in waves, we can assume that the more high energy the waves are, the faster they will go. So therefore, higher energy travels faster.

Hope that helps you!

Answer:

True

Explanation:

Answer:

A

Explanation:

Answer:

B. The western coast of the united states

Explanation:

I'm not sure if its correct but its pretty simple to understand, if you look at the arrows red represents heat, and blue represents cold,  the red arrows (warm climate) is at the left more towards the U.S, therefore looking at the guide of North West South and East, it is at the western coast of the u.s

Hope this help! <3

Element Si, Ge, Sn, Pb have similar properties to carbon.

Reasons:

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The average thickness of the sheet in meters is 6.8 x 10⁻⁵ m.

The volume of the gold piece can be found using its mass and density:

V = m/p = 330 mg / 19.3 g/cm³ = 0.017 cm³

The surface area of the sheet can be found using its length and width:

A = l x w = 1.54 in x 2.53 in = 3.86 in²

Since 1 in² = 6.4516 cm², the surface area of the sheet can be converted to square centimeters:

A = 3.86 in² x (6.4516 cm²/in²) = 24.91 cm²

The average thickness of the sheet can be found by dividing the volume of the gold by the surface area of the sheet:

t = V / A = 0.017 cm³ / 24.91 cm² = 0.00068 cm

Since 1 cm = 0.01 m, the average thickness of the sheet can be converted to meters:

t = 0.00068 cm x 0.01 m/cm = 6.8 x 10⁻⁵ m

So the average thickness of the sheet is 6.8 x 10⁻⁵ m.

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Answer:

shcik

Explanation:

Answer:

shcik

Explanation:

Answer:

An increased population in younger women. Studies show that younger women may have more children.

I can't put too much complex information or brainly will delete this.

I hope this answers your question! Thanks, and have a wonderful day.

In an ecosystem with an increase in population of young women there can be an increase in the number of births.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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The energy in joules of one mole of photons of visible light having a wavelength of 4.11×10^2 nm? can be expressed as 2.9*10^5 J

From the question we were told to find the energy and the parameters that is needed to calculate these are;

c=3*10^8

h= 6.626 * 10^-34 J.s

1 mol photons = 6.023x10^23 photon

λ = 4.11×10^2 nm  = 4.11 × 10-7 meters

The parameters can be input  as Energy of one mole photon (E) = ( 6.023x10^23 * 6.626 * 10^-34 * 3*10^8)/ (4.11 × 10^-7)

=291302

=2.9*10^5 J

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The compound Li₂SO₄ on dissociation gives two moles of Li+ ions and one mole of SO₄ ²⁻ ions. Then the molarity of SO₄ ²⁻ is 0.611 M itself and the molarity of Li+ ions is 1.22 M.

Molarity of a solution is the ratio of  number of moles of solutes in that solution to the volume of solution in liters. It is a colligative property and depends on the amount of solute and solvent.

Molarity = n/V in L.

Given that, the molarity of Li₂SO₄ solution is 0.611 M. The complete dissociation of this compound is written as follows:

\(\rm Li_{2}SO_{4} \rightarrow 2 Li^{+} +SO_{4}^{2-}\)

Here, the ionization of the compound produces 2 moles of Li+ and one mole of sulphate ions. Then, the molarity of the sulphate ions is the same as the whole solution that is 0.611 M.

Then molarity of the Li+ ions in the solution will be 1.22 M.

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