If the half-life of a decaying isotope is 10 years, which statement is true after
20 years?

Answer:

Good luck man

Explanation:

Good luck man

Radioactive elements are the elements into which an atom is very unstable or highly reactive because it is having more energy in its nucleus. stable elements are those who have stable and there shell are properly filled with electrons.

Most radioactive chemical elements have one or more radioactive isotopes on the other hand  some chemical elements only have one type of radioactive isotopes.

A radioactive element has an unstable nucleus that emits particles in the form of alpha, beta, or gamma radiation and stable element have stable nucleus with no effect of any radiation or energy due to fully filled orbitals.

Bombarding of these radiations has to be done in the nucleus of the element after this the desired element will become a radioactive element. And there is no effect of these rays on stable elements beacuse they are unreactive to this.

The ray of alpha beta and gamma consists of some charges within them and they are radioactive radiations harmful to human eyes.

Learn more about radioactive elements, here:

https://brainly.com/question/13234158

#SPJ2

Answer: A 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M [tex]H_{2}SO_{4}[/tex] solution.

Explanation:

Given: [tex]M_{1}[/tex] = 18.0 M,     [tex]V_{1}[/tex] = ?

[tex]M_{2}[/tex] = 1.00 M,         [tex]V_{2}[/tex] = 250 mL

Formula used to calculate the volume of concentrated acid is as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]

Substitute the values into above formula as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}\\18.0 M \times V_{1} = 1.00 M \times 250 mL\\V_{1} = \frac{1.00 M \times 250 mL}{18.0 M}\\= 13.88 mL[/tex]

Thus, we can conclude that 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M [tex]H_{2}SO_{4}[/tex] solution.

Answer:

See explanation below

Explanation:

To get this, we need to apply the general expression for half life decay:

N = N₀e(-λt)    (1)

Where:

N and N₀ would be the final and innitial quantities, in this case, masses.

t: time required to decay

λ: factor related to half life

From the above expression we need λ and t. To get λ we use the following expression:

λ = t₁₂/ln2   (2)

And we have the value of half life, so, replacing we have:

λ = 8.04 / ln2 = 11.6

Now, we can replace in (1) and then, solve for t:

0.75 = 40 exp(-11.6t)

0.75 / 40 = exp(-11.6t)

ln(0.01875) = -11.6t

-3.9766 = -11.6t

t = -3.9766 / -11.6

Answer:

Chemical reactions and physical transformations do not create or destroy mass in an isolated system, according to the law of conservation of mass. The mass of the products in a chemical reaction must equal the mass of the reactants, according to the conservation of mass law. The law of conservation of mass can be used to solve for unknown masses, such as how much gas is consumed or produced during a reaction.

Answer:

Power = 1011.2 Watts

Explanation:

Given the following data;

Voltage = 128 Volts

Current = 7.9 Amperes

To find the power rating;

Mathematically, the power rating of an electrical device is given by the formula;

Power = current * voltage

Power = 128 * 7.9

Power = 1011.2 Watts

Answer:

Explanation:

Completely turn off equipment like televisions and stereos when you're not using them.

Choose energy-efficient appliances and light bulbs.

Save water.  

Lower your shades or close your curtains on hot days, to keep the house cool and reduce the use of electric fans or air-conditioning.

Let clothes dry naturally.

Keep lids on pans when cooking to conserve energy.

Use rechargeable batteries.

Don’t use “throw away” products like paper plates and napkins, or plastic knives, forks and cups.

Send electronic greetings over email, instead of paper cards.

Answer:

Carbon and oxygen are similar in a few ways. They are both elements, which are the fundamental building blocks of all matter. This means that they both have protons and electrons. They also both have neutrons

Answer:

false

Explanation:

metal such as copper, silver, etc conducts heat and electricity. an object such as a rock, plastic, paper does NOT conduct heat.

answer : i don’t knowww :)

Right spelling:

Answer: I don’t know. :)

Answer:

Assertion (A) is true

but reason (R) is false.

Explanation:

If we look at the assertion closely, it is true that a sublime substance changes from solid to gas without  passing through a liquid state. Naphthalene, camphor, iodine and ammonium  chloride are some common  examples of the substances  which undergo sublimation.

However, not all solids first pass through a liquid state before converting to gas. Sublime solids such as those listed above passes directly from solid to gas without passing through a liquid state.

Hence the assertion is true but reason is false.

Answer:

27.3 days

Explanation:

I really have no explanation lol.

Answer:

Hope thia helps

Explanation:

it takes 27.3 days!!!

In a chemical reaction, the very same atoms were present both in the reactants and products, but they are reorganised as a result of the reaction.

Opposition against an influence, force, or movement. preference for an antiquated political, social, and policy system, in particular. a response to a certain process, situation, or stimulus. She was shocked by the information. Substances are made up of chemical compounds and chemical constituents.

Due to forces, an item will either be in rest or moving. Consider a football that is motionless and resting just on ground as an example.

To know more about reaction visit :

brainly.com/question/28984750

#SPJ1

Answer:

Heyaa!! Im Pinky and Im here to inform you that your answer is...

Explanation:

!!! 36.8189451 Grams !!!

  Have an amazing day!!!

~Pinky~!!

Answer:

A:smog is a phenomenon brought about by natural events

Explanation:

false because of how phenomenon it is smog did not bought phenomenon and natural events!!

DOES THIS HELPFUL?

Answer:

the property of air shown in the figure describe A.mass

Answer:

[tex]\boxed {\boxed {\sf 40.4299 \ Joules}}[/tex]

Explanation:

Potential energy is energy due to position. It is the product of mass, height, and acceleration due to gravity.

[tex]PE= m \times g \times h[/tex]

The mass of the textbook is 1.85 kilograms. Assuming this is on Earth, the acceleration due to gravity is 9.8 meters per square second. The height is 2.23 meters.

Substitute the values into the formula.

[tex]PE = 1.85 \ kg \times 9.8 \ m/s^2 \times 2.23 \ m[/tex]

Multiply the first 2 numbers together.

[tex]PE=18.13 \ kg*m/s^2 *2.23 \ m[/tex]

Multiply again.

[tex]PE= 40.4299 \ kg*m^2/s^2[/tex]

[tex]PE= 40.4299 \ J[/tex]

The textbook has 40.4299 Joules of potential energy.

Answer:

0.74

Explanation:

this is the correct answer. I followed a correct answer that had the same probelm with different values, swithxed it with mine, and got 0.75. So its basically 0.74

Answer:

A) Mg + H2SO4 → MgSO4 + H2

B) CaCO3 + 2HCl → CaCl2 + H2O + CO2

C) CaO + H2O → Ca(OH)2

D) 3Ag + 4HNO3 → 3AgNO3 + H2O + NO2

Explanation:

A) Mg + H2SO4 → MgSO4 + H2

The equation is already balanced because the number of each element in the left hand side is already equal to that in the right hand side.

B) CaCO3 + 2HCl → CaCl2 + H2O + CO2

This equation is balanced by putting 2 in front of HCl on the left hand side to balance the elements on the right hand side.

C) CaO + H2O → Ca(OH)2

Thus equation is already balanced because the number of each element in the left hand side is already equal to that in the right hand side.

D) 3Ag + 4HNO3 → 3AgNO3 + H2O + NO2

This equation is balanced by putting 3 in front of Ag and 4 in front of HNO3 on the left hand side while we put 3 in front of AgNO3 on the right side to balance the elements on the right hand side.

Answer: The statement collisions only result in a reaction if the particles collide with a certain maximum energy called the activation energy of the reaction, is false.

Explanation:

Activation energy is the minimum amount of energy required to initiate a chemical reaction.

So, when activation energy for a reaction is lower then molecules with lower energy can also participate in the reaction. As a result, more number of collisions will take place due to which an increase in the rate of reaction will takes place.

When activation energy for a reaction is larger then molecules with higher energy will not be able to participate in the reaction. As a result, less number of collisions will take place due to which a decrease in rate of reaction will occur.

Therefore, we can conclude that the statement collisions only result in a reaction if the particles collide with a certain maximum energy called the activation energy of the reaction, is false.

Answer:

true

Explanation:

particularly must collide with energy equal to or greater the

Answer:

A maybe I said maybe hope help

Explanation:

..

The rules of base pairing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with the pyrimidine thymine (T) C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G)

The nucleotides in a base pair are complementary which means their shape allows them to bond together with hydrogen bonds. The A-T pair forms two hydrogen bonds. The C-G pair forms three. The hydrogen bonding between complementary bases holds the two strands of DNA together.

Answer:

Neutrons and protons

Explanation:

There are three fundamental subatomic particles, these are;neutrons protons and electrons.

Ernest Rutherford successfully showed that every atom does possess a central core that contain positively charged particles (protons) called the nucleus. Chadwick later discovered the existence of neutrons.

Both protons and neutrons are found in the nucleus. Z represents the nucleus of the boron atom and houses the neutrons and protons of the boron atom.

Answer:

a,b,c

Explanation:

Answer:

C

...................

Answer:

No

Explanation:

If tin is heated, it can react with alkalis' with the release of hydrogen.

Tin is a great metal that is used for packaging purposes.

However, if the tin in the tin can is replaced with alkali metals then they will readily react with the acid present in the food materials stored inside, thereby rendering the food unsafe.

https://brainly.com/question/18153051

Answer:

The solubility of a saturated solution can be increased by increasing the temperature.

Explanation:

Temperature -- Generally, an increase in the temperature of the solution increases the solubility of a solid solute. For example, a greater amount of sugar will dissolve in warm water than in cold water. A few solid solutes, however, are less soluble in warmer solutions.

Answer:

mass(m)=26.4g

volume (v)=3.0cm²

we have

density =m/v=26.4/3=8.8g/cm³

since it is equal to density of nickel.

Option C nickel is a required answer.

Answer:

[tex]\huge\boxed{\fcolorbox{green}{yellow}{option \: \: c}}[/tex]

Answer:

Lithium Cation is a monovalent cation that is metabolized much like sodium and is important in many cellular functions inside or on the surface of cells. lithium has a single valence electron that is easily given up to form a cation. Because of this, lithium is a good conductor of heat and electricity as well as a highly reactive element, though it is the least reactive of the alkali metals