If the half-life of Uranium-235 is 176000 years and 12.5 g of Uranium-235 remain after 704000 years, how much of the radioactive isotope was in the original sample.

Answers

Answer 1
There should be about 200 g in the original sample

Related Questions

i need to know what word goes into that the words are in each sentence plz help me i will give brainliest thank you :)

Answers

Answer:

im taking these points baby lol

Explanation:

i love you  <3

as water cruise to a temperature of zero degrees Celsius and form ice water molecules tend to
A. move faster apart
B. vibrate rapidly
C. flow more randomly
D. gradually expand

Answers

Answer:

B. vibrate rapidly

Explanation:

Mark above answer as BRILLIANT

Quinton answer me or I will never talk to u again pls

Answers

Answer:

huh

Explanation:

Which of the following contains the most atoms?
24.305 g Mg
39.098 gk
21.62 g B
9.0122 g Be

Answers

Explanation:

9.0122 g be Maybe, sorry i don't think so

In the above , the sample of B 21.62 g of boron contains the most atoms because it has approximately 2 moles, while the other samples have only 1 mole each.

What is atoms

The molar mass of each element can be found on the periodic table.

The molar mass of Mg (magnesium) is about 24.305 g/mol.The molar mass of K (potassium) is about 39.098 g/mol.The molar mass of B (boron) is approximately 10.81 g/mol.The molar mass of Be (beryllium) is about  9.0122 g/mol.

To calculate the number of moles in each sample, we divide the mass of each sample by its respective molar mass:

For Mg: Number of moles = 24.305 g / 24.305 g/mol = 1 moleFor K: Number of moles = 39.098 g / 39.098 g/mol = 1 moleFor B: Number of moles = 21.62 g / 10.81 g/mol ≈ 2 molesFor Be: Number of moles = 9.0122 g / 9.0122 g/mol = 1 mole

Therefore, the sample with 21.62 g of boron (B) contains the most atom

Read more about  atoms here:

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How many electrons does gallium give up when it becomes an ion?

Answers

Answer:

3 electrons comrade

Explanation:

Choose the electron configurations which are possible for an unexcited atom. Example 1 – 1s22s22p4 Example 2 – 1s22s22p63s23p33d1 Example 3 – 1s22s22p83s1 Example 4 – 1s22s22p63s1

Answers

Answer:

Examples 1, 3 and 4

Explanation:

An unexcited atom is an atom in the ground state i.e the atom has it's valence electrons in it's lowest energy level possible. This actually implies the normal electronic configuration of the atom. Thus, examples 1, 3 and 4 have the actual electronic configuration with there valence electrons in the lowest possible energy level.

Example 1: 1S² 2S² 2P⁴

Example 3: 1S² 2S² 2P⁶ 3S¹ (There seem to be a mistake in the question provided, P energy level can only 6 electrons not 8)

Example 4: 1S² 2S² 2P⁶ 3S¹

NOTE: If you take a look at example 2, it will be deduced that the 3P energy level has only 3 valence electrons and the last valence electron jumped to 3d energy level; making that atom appear to be in it's excited state.

write the number 3000,000,000 in scientific notation

Answers

Answer:

3 x 10^9

Explanation:

The concept of continental drift was developed by Alfred Wegener. Which of the following pieces of evidence does NOT support Wegener's hypothesis?
Group of answer choices

Fossils of the same organisms are found on different continents.

Similar glacial sediments are found in different parts of the world.

The shapes of the continents fit together like pieces of a jigsaw puzzle

Climates at different latitudes are similar to one another.

Answers

Answer:

Climates at different latitudes are similar to one another.

Explanation:

The choice that is not a proof of Wegener's concept of concept of continental drift is that climates at different latitudes ae similar to one another.

Wegener did not use climatic evidence to proof continental drift. He did use fossils found on different continents such as the mesosaurus to propose the theory of continental drift. Wegener also used evidence of glacial sediments to justify his claims. He also fitted the earth into a giant puzzle.

Answer:

Climates at different latitudes are similar to one another.

Which statement describes the charging method shown?

The spheres are charged through friction.
The spheres develop the same charge.
Electrons move from the rod to Sphere A.
Electrons move from Sphere A to Sphere B.

Answers

Answer:

D

Explanation:

correct on edge 2021 :)

The movement of the electrons from sphere A to sphere B is shown as the charging method. Thus option D is correct.

What is an electron?

An electron is a negatively charged subatomic particle and can either be free or bound to the nucleus and it exists in a spherical shell. of the various radii that represent the energy levels. The movement of the electron from sphere one to sphere two is represented by the image.

Find out more information about the charging method.

brainly.com/question/3245124

How do volcanos such as ojos del salado form?

Answers

Answer:

Deep inside Earth, between the molten iron core and the thin crust at the surface, there is a solid body of rock called the mantle. When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt.

Explanation: hot molten rock, ash, and gases escape from the volcano

which of the following is NOT a substance?

A. sodium
B. water
C. alcohol
D. air
E. table salt

can select more than one if needed​

Answers

I believe the answer is d Air

Answer:

c. alcohol

it has no substance

Evaluating Lewis Structures
Explain what is wrong with the following structure.

An upper H is single-bonded to a H to the right, which is single bonded to an upper O with pairs of dots above, to the left, and below.

Answers

Answer:

Hydrogen cannot have more than two electrons. Hydrogen bonds to only one other atom at a time.There are too many electrons in the final structure.

Explanation:

Answer:

Explanation:

Hydrogen cannot have more than two electrons. Hydrogen bonds to only one other atom at a time. There are too many electrons in the final structure.

write the name of and molecular formula of compound which gives hydrogen ion and chloride ion in the solution state. in which colour is the methyl orange changed after treating it with this compound. why? write the name of salt when the compound is treated with lime water. write the chemical equation. ​

Answers

I hope it is helpful for you .....

There are _____ Chemical families in the periodic table.

Answers

Explanation:

18

In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 3 and 4) are not numbered.

Most solid solutes will dissolve ___ at ___ temperatures

A. slower, higher
B. faster, higher
C. faster, lower​

Answers

Answer:

B

Explanation:

The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.

What holds the two parts of a metal together?
S
E
A​

Answers

Answer: The metal is held together by the strong forces of attraction between the positive nuclei and the delocalized electrons (The Electron Sea Model.

Explanation: I hope that helped!

The metal is held together by the strong forces of attraction between the positive nuclei and the delocalized electrons (Figure 1). Figure 1: Metallic Bonding: The Electron Sea Model: Positive atomic nuclei (orange circles) surrounded by a sea of delocalized electrons (yellow circles).

Which type of substance have a definite shape and fixed volume?
Solids only
Liquids and solids
Gases only
Liquids and Gases

Answers

The answer is A. Solids only
Answer: A Solids only



Explanation: Happy Thanksgiving!

Indicate the answer choice that best completes the statement or answers the question.
The crust and upper mantle make up Earth's
O a. lithosphere Ob. asthenosphere
O d. continents
Oc. core
Question 2
Question 3
Question 4
Question 5
Question 6
Question 7
Question 8
Question 9
Question 10
Question 11
Question 12
Question 13
Question 14
Question 15
Question 16
Question 17
Question 18
Question 19
Question 20
LO

Answers

Answer: lithosphere

Explanation:

continents are a part of lithosphere.

core is a structure of earth

Santiago's car has an overall average speed of 25 cm/s. If he could increase his car's overall average speed by 10%, what would his car's new overall average speed be?

Answers

Given:

The overall average speed = 25 cm/s.

The overall average speed increased by 10%.

To find:

The new overall average speed.

Solution:

We have,

Overall average speed = 25 cm/s.

The overall average speed increased by 10%. So, the new average speed is

New overall average speed = Initial average speed + 10% of initial  overall average speed

[tex]\text{New overall average speed}=25+\dfrac{10}{100}\times 25[/tex]

[tex]\text{New overall average speed}=25+2.5[/tex]

[tex]\text{New overall average speed}=27.5[/tex]

Therefore, the new overall average speed is 27.5 cm/s.

The energy released in cellular respiration helps an athlete perform. How do you think an athlete might be able to increase cellular respiration?

pls i will give brainliest

Answers

eating healthy foods

working out and eating healthy helps

Answer:

higher as

beacause having  a healthy diet inproves

your health

Explanation:

plzzz!!! Write the equation for rusting urgently needed​

Answers

Answer:

[tex]Fe_{2} O_{3}[/tex]

Explanation:

What classification should this reaction have? CaC12 + F2 = CaF2 + CI2

Answers

Answer:

Single-Replacement Reaction

General Formulas and Concepts:

Types of Reactions

Synthesis Reactions: A + B → AB Decomposition Reactions: AB → A + B Single-Replacement Reactions: A + BC → AB + C Double-Replacement Reactions: AB + CD → AD + BC

Explanation:

Step 1: Define reaction

CaCl₂ + F₂ → CaF₂ + Cl₂

Step 2: Identify backplate

Single-Replacement Reactions: A + BC → AB + C

BC = CaCl₂

A = F₂

AB = CaF₂

C = Cl₂

The more quickly you change your _____, the more ____ you will have to exert

Answers

Answer:

name, force

Explanation:


7. At what structures in the lungs do the exchange of oxygen and carbon dioxide take place?
A. Bronchi B. Alveoli C. Bronchioles D. Trachea
LA​

Answers

Answer:

Answer is Alveoli

Hope it helps.... plz mark as brainliest

answer correctly for a brainleist! :)

Answers

Answer:

summer

Explanation:

Why because the earth is around the sun the

Please answer 7-9 i am using alot of my points for this

Answers

Answer:

7... simalair: made of more than 2 things    DIffernt: elemants are made of atoms.

Explanation:

what is the substance of air

Answers

Answer:

The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapour and small amounts of other elements (argon, neon, etc.). Higher in the atmosphere air also contains ozone, helium and hydrogen.

Explanation:

:))

which reaction is faster?why?

Answers

Answer:no answer

Explanation:

Temperature. Usually reactions speed up with increasing temperature. Physical state of reactants. Powders react faster than blocks - greater surface area and since the reaction occurs at the surface we get a faster rate.

A physical property tells how a substance changes into a new substance

Answers

Answer:

false

Explanation:

Please help me with these questions... please..

Imagine you are a scientist who has just discovered a new element. The element has an atomic number of 113, and it has three elections in the outer energy level of each atom.
Which element would have properties most similar to the new element?
Group of answer choices

A.boron
B.carbon
C.hydrogen
D.beryllium

What would you name this new element?

Answers

Answer:

3 valence electrons

The element with the atomic number 113 would fall in the 13th column of the periodic table Group IIIA. This group has an electron configuration that would end as p1 , meaning there would be 3 valence electrons. The valence electrons are the electrons found in the highest energy level in the s and p orbital.

Explanation:

Nihonium has to be the #113 element of the periodic table

A. is the correct answer because Boron has 3 electrons too,

All elements in Group 13 have three electrons in their outermost energy level. The two most popular elements in this group are Boron and Aluminum.

Boron element would have properties most similar to the new element. Therefore, option (A) is correct.

Why do the elements of same group have similar chemical behavior?

The chemical properties of elements depend on the number of valence electrons in their valence shell. Elements in the same group in the modern periodic table have the same number of valence electrons. Therefore, chemical elements situated in same group of the modern periodic table have similar chemical behavior.

The chemical elements having an identical outer electronic configuration in their atoms are placed in the same group of the periodic table. These valence electrons of an element are responsible chemical behavior and reactivities of the elements.

Therefore, both Boron and a new element with atomic number 113  have three electrons in their valence shells. So they belong to the same group and will have similar chemical properties.

Learn more about elements with similar chemical behavior, here:

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