PLEASE HELP WILL GIVE BRAINLEIST ASAP Determine the fraction of an original sample of K-42 that remains unchanged after 24.72 hours.

Answer:

it losses one neutrons that is hydrogen

Answer:

water

Explanation:

because the others are in compounds and can not be considered as  products lonely.

Answer:

At the cathode in an electrolytic cell, ions in the surrounding solution are reduced into atoms, which precipitate or plate out on to the solid cathode. The anode is where oxidation takes place, and the cathode is where reduction takes place.

Explanation:

Since positive ions pick up electrons at the negatively charged cathode, reduction takes place there.

The process of obtaining electrons or a decrease in an element's oxidation state in such a chemical reaction would be known as reduction, which is the movement of electrons among species. An increase in the number of electrons connected to a single or a collection of atoms is the result of a reduction chemical process.

The electron would be a subatomic particle with a negative one elementary charge electric charge. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, have been typically regarded to be elementary particles.

In an electrolytic cell, the cathode is where ions in the neighboring medium could be converted into atoms, which then plate out or precipitated onto the solid cathode. Both oxidation and reduction occur at the anode but also cathode, respectively.

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Answer: The resulting isotope is [tex]^{231}_{92}\textrm {U}[/tex]

Explanation:

Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.

[tex]^{235}_{92}\textrm{U} \rightarrow ^{231}_{90}\textrm {Th}+^{4}_{2}n[/tex]

Beta Decay : It is a type of decay process, in which a proton gets converted to neutron and an electron. This is also known as -decay. In this the mass number remains same but the atomic number is increased by 1.

[tex]^{231}_{90}\textrm{Th}\rightarrow ^{231}_{92}\textrm {Th}+2^{0}_{-1}n[/tex]

The resulting isotope is [tex]^{231}_{92}\textrm {U}[/tex]

Answer:

False

Explanation:

Answer:

A is condensation

B  is Conduction

C is erosion

D is radiation

E is deposition

Explanation:

Answer:

C. A human shivers when exposed to cold weather.

Explanation:

Homeostasis simply refers to balance, which is desirable in the context of an organism. In this problem, the only one that demonstrates this is a human shivers when exposed to cold weather. By using kinetic energy, heat is generated, maintaining a balance, so to speak.

(btw you may find it more helpful to post these types of problems under biology in the future.)

Answer:

It should be A) +5

Explanation:

Explanation:

It's a triple bond for nitrogen,double bond for oxygen(just saying)

digestion

does that answer it?

Answer:

E = -0.76 V

Explanation:

The potential between the anode and the cathode is called standard reduction potential. It gives the tendency of the species to get reduced.

The given half reaction is :

[tex]Zn^{2+}(aq)+2e^{-}\rightarrow Zn(s)[/tex]

Zn²⁺ is the reduced form of Zn.

It is a stronger reducng agent.

Its standard reduction potential (E) has a sandard value.

E = -0.76 V

Hence, the correct option is (c).

Answer:

the answer is c or d

Explanation:

you can cross out e because it dont make any sense

b thats just data

a is the definition of law

Answer:

Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons (or electron density). An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.

Answer:

A simple mix of baking soda, kosher salt, and dish soap

Explanation:

I  don't know why you would need to know this but the stuff mentioned above should get rid of the grease

Answer:

Sample Response for Edge2021: Ren should use a cleaning product that contains a base. This is because bases readily react with lipids, the kind of compound that makes up grease. A base would break down the grease, forming soap, which would then easily wash away.

Explanation:

Answer:

I would guess that the MA of the screwdriver is 120N.

Explanation:

I think this because you are adding 30 and 90, since there are two forces being acted on the same place in the same direction.

#teamtrees #WAP (Water And Plant)

Answer:

B

Explanation:

CH4 + 2 O2 → CO2 + 2 H20

12 + I X 4 → → 2 ( I X2 + 16 )

16 → → 36

25, 5 → → ?

amount of H2O = 36 X 25,5 / 16 = 57. 39

One mole or 16 g of methane gas reacts with excess oxygen to give 2 moles or 36 g of water. Then, the mass of water produced from 25.5 g of methane is 57.3 g.

Combustion is the reaction of a gas with the atmospheric oxygen producing water and carbon dioxide. The hydrocarbon gases such as methane, ethane etc easily undergo combustion reaction.

As per the given balanced reaction, one mole of methane gas CH4 produces two moles of water.

molar mass of methane = 16 g/mol

molar mass of water = 18 g/mol

mass of 2 moles of water = 36 g.

Hence, 16 g methane gas produce 36 g of water.

The mass of water produced from 25.5 grams of methane gas is then calculated as follows:

mass of water = 25.5 × 36 / 16 = 57.3 g.

Therefore, 57.3 g of water is produced in this reaction from 25.5 g of methane.

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Answer:

a.) x = 5

Explanation:

Answer:

Reading on left looks like 1.4

Explanation:

Answer:

Measurement helps in buying and selling goods

Measurement helps in doing various science

experiment

Measurement is used in our daily life

Measurement is essential for making roads, bridge etc

Answer:

18.6 ( had to be 20 letter :/)

Explanation:

The volume = 309.04 ml

Given

Specific gravity=-1.28 and strength =24.7% by mass of H₂SO₄

mass 125g of ZnC0₃

Required

The volume of H₂SO₄ Solution

Solution

Reaction

ZnCO₃ + H₂SO₄ → ZnSO₄ + CO₂ + H₂O

mol of ZnCO₃(MW=125.4 g/mol) :

[tex]\tt mol=\dfrac{125}{125.4}=0.997[/tex]

From equation, mol ZnCO₃ : H₂SO₄= 1 : 1 so mol H₂SO₄=0.997

mass of H₂SO₄ (MW=98 g/mol) :

[tex]\tt mass=mol\times MW=0.997\times 98=97.706~g[/tex]

mass of solution :

[tex]\tt \dfrac{100}{24.7}\times 97.706=395.57~g[/tex]

Volume of solution :(density of solution=1.28 g/ml for the reference substance is water(density=1 g/ml)

[tex]\tt V=\dfrac{395.57}{1.28}=309.04~ml[/tex]

Answer:

there u go

Explanation:

Answer:

[tex]\boxed {\boxed {\sf Almost \ all \ phosphates \ are \ insoluble}}[/tex]

Explanation:

For magnesium phosphate to make an aqueous solution, it must be soluble in water.

Let's check the solubility rules. There are many different lists and versions, but it should mention a rule about phosphates.

Magnesium phosphate is included in "all phosphates" so it is insoluble and can't become an aqueous solution.

Magnesium Phosphate (Mg₃(PO₄)₂) would not make an aqueous solution because it is insoluble in water.

A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.

According to the solubility rule, all phosphates are insoluble in water except sodium and potassium phosphates and thus magnesium phosphate does not form an aqueous.

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Answer:

M = 0.23 M

Explanation:

Given data:

Molarity of solution = ?

Mass of NH₄Br = 4.50 g

Volume of solution = 213 mL (213 mL× 1L /1000 mL = 0.213 L)

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Number of moles of NH₄Br:

Number of moles = mass/molar mass

Number of moles = 4.50 g / 97.94 g/mol

Number of moles = 0.05 mol

Molarity:

M = 0.05 mol/ 0.213 L

M = 0.23 M

Answer:

λ = 0.45×10⁻⁶ m

Explanation:

Given data:

Wavelength of blue light = ?

Frequency of blue light = 6.69×10¹⁴ s⁻¹

Solution:

Formula;

Speed of wave = wavelength × frequency

Speed of wave = 3.00×10⁸ m/s

by putting vales,

3.00×10⁸ m/s = λ × 6.69×10¹⁴ s⁻¹

λ = 3.00×10⁸ m/s / 6.69×10¹⁴ s⁻¹

λ = 0.45×10⁻⁶ m

Answer:

Nuclear energy produces radioactive waste

A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years

Explanation:

An atom is the fundamental unit of matter and it contains an equal number of protons and electrons in its nucleus which makes it electrically neutral. An ion however, is an atom containing an unequal number of protons and electrons which means it will either carry a net positive charge or negative charge depending on whether there are more electrons or protons.

Answer:

atoms are neutral or they have equal number of proton and electron but ions can be cation(positively charged) or anion(negatively charged) based on the number of electron the atom lose and gain respectively

Answer:

1 × 10⁸ He atoms

Explanation:

Step 1: Given data

Step 2: Convert "d" to meters

We will use the conversion factor 1 m = 10¹² pm.

1 × 10² pm × (1 m / 10¹² pm) = 1 × 10⁻¹⁰ m

Step 3: Convert "D" to meters

We will use the conversion factor 1 m = 100 cm.

1 cm × (1 m / 100 cm) = 0.01 m

Step 4: Calculate the number of atoms of He required

We will use the following expression.

D/d = 0.01 m / 1 × 10⁻¹⁰ m = 1 × 10⁸