CHEMISTRY MIDDLE SCHOOL

A radioisotope used for diagnosis must emit gamma rays of sufficient energy to escape from the body and it must have a half-life short enough for it to decay away soon after imaging is completed. TRUE

FALSE

Answers

Answer 1
Answer:

Answer: True

Explanation: If this is right brainliest it for me


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MIDDLE SCHOOL

Any tips for Chemistry Practical? Im taking my Olevel practical tmr. Anyone?​

Answers

Answer:

re-do test if needed

Explanation:

if you're done early for the practical, check your answers back to the solutions. If feel the need to re-check if the answers are somewhat correct, re-do the steps :) all the best!

HIGH SCHOOL

Which scenario would result in the fastest rate of dissolution? A) A sugar cube in hot water.
B) A sugar cube in cool water.
C) Powdered sugar in hot water.
D) Powdered sugar in cool water

Answers

Answer:

The Correct Answer is C

Explanation:

  • The valuation of dissolving of a solute in a solution is quicker when the solute and solution are mixed, the solution is hotter, or the solute contains less shreds with more covering space.
  • The valuation at which a solute eradicates depends upon the extent of the solute shreds. Dissolving is a covering appearance as it depends on solution particles clashing with the exterior cover of the solute.

C) powdered sugar in hot water because the sugar is already broken so  it would be  more faster than sugar cube  in hot  water
MIDDLE SCHOOL

Which is of these nonmetals are more reactive— bromine or krypton? Explain.

Answers

 The  non metal  which  is  more reactive  is bromine


         Explanation

Bromine is in group 17 ( group  of halogens)  which has  one unfilled  spot  in its valence shell.  

Krypton is group 18 ( groups  of noble gases)  which do not  react with  other element  in normal condition due  to  their  filled valence electron.

Therefore since  bromine  has unfilled  valence shell  it is  more reactive  than krypton.

HIGH SCHOOL

If there is a reaction mixture in an organic solvent that contains an organic acid, an organic base, neutral organic compounds, and base containing impurities, what is in the aqueous layer after complete treatment with naoh(aq)?

Answers

Answer is: organic acid will be in aqueous layer after treatment with sodium hydroxide.
An organic base, neutral organic compounds and base containing impurities will not change polarity with reaction with sodium hydroxide (base) because they not react with bases. Organic acid reacts with sodium hydroxide and change polarity because releases proton and become salt that dissolves in water. Other molecules are dissolved in nonpolar organic layer.
MIDDLE SCHOOL

Living things change over time in response to changes in their environment
cloning
future change
past extinctions

Answers

Change in their environment
HIGH SCHOOL

What is the atomic number of pt-175 after it undergoes alpha decay

Answers

The atomic number of pt-175 after it undergoes alpha decay is 76

Radioactive decay is defined as the splitting of heavy unstable isotopes to two or more stable particles. The three main types of radioactive decay are

  • alpha decay (α-decay).
  • beta decay (β-decay)
  • gamma decay(γ-decay)

An Alpha decay occurs when the radioactive nucleus releases a helium ion (alpha particle) leaving the daughter   nucleus with a  reduced atomic  number by 2 and reduced  atomic mass by  4.  

An example is the alpha decay  below

¹⁷⁵Pt₇₈ ---->      ¹⁷¹ Os₇₆   + ⁴ He₂

Here,Platinum 175  with atomic number 78 undergoes alpha decay to produce Osmium 171 with atomic number 76.

See related answer here:brainly.com/question/5876246

Answer:

76

Explanation:

Alpha decay is one of the most basic forms of radioactive decay. It has an atomic mass of 4 and a proton number of two.

Undergoing an alpha decay will decrease the atomic mass by four and the atomic number by two.

In this particular question, we are particular about the atomic number. The atom has an atomic number of 78. So taking 2 off this gives 76

MIDDLE SCHOOL

Can depletion to the ozone cause changes to the biochemical cycles

Answers

Hoi!! 

its true
 
hope this help!!
:) np


Answer:

True

Explanation:

edgen 2022

HIGH SCHOOL

Can sodium bond with potassium?

Answers

No because it will not form a bond
No,they will not form a bond because both has the tendency to loss one electron and gain +ve charge, as we know like charges repel
HIGH SCHOOL

What is the name of the compound Cd(MnOÁ)¿?

Answers

Cadmlum Permanganate :)
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