1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Elden [556K]
3 years ago
6

How many milligrams of a 20mg sample of cesium-137 remain after 60 years

Chemistry
1 answer:
andrey2020 [161]3 years ago
5 0
Cs -137 has a half life of about 30 years. If 60 years pass, there is two half lives passed so 1/2 * 1/2= 1/4. Take 1/4 and multiply it with the mass given:
(1/4)*20mg=5mg left
You might be interested in
Which water usage uses the least amount of water in a year in the United States
statuscvo [17]

Answer: a

Explanation:

Industry uses only about 18% while the others use around 70-90% of water.

YW!!! please mark branlest!!!! =^.^=

4 0
2 years ago
I wrote that all matter consists of tiny particles called atoms. I also thought all atoms of a specific
Westkost [7]

Answer:

John Dalton

Explanation:

John Dalton in 1808 suggested that all matter consists of tiny particles called atoms and that the atoms of a specific element are identical.

He postulated the Dalton's atomic theory which has the following important parts;

  • All matters consists of indivisible particles called atoms
  • Atoms of the same element are similar and are different from atoms of other elements.
  • Atoms can neither be created nor destroyed.
  • Atoms combine in simple whole ratios to form compounds.
7 0
3 years ago
What is a difference between an atom and a molecule.....???? <br>(Plz follow me)​
Misha Larkins [42]

Answer:

An atom is the smallest particle of an element that can take part in a chemical reaction while a molecule is a group of chemically combined atoms.

Explanation:

8 0
3 years ago
There are 14 women and 12 men in an engineering class. The professor wants to send some of his students to a national conference
Viktor [21]

7.3% would be the correct answer

4 0
3 years ago
Write a balanced chemical equation for the reaction of copper(II) sulfate and concentrated ammonia to produce teramine copper(II
Rudiy27

Answer:

CuSO4(aq) + 4NH3(aq) + nH2O→ [Cu(NH3)4H2On]S04(aq)

Explanation:

When the concentrated ammonia is added into the copper ions solution, a blue solid is formed. This blue solid is gelatinous.it consist of Cu(OH)2 in insoluble form. As more ammonia is added precipitate start to dissolve and [Cu(NH3)4]∧+2 is produce.

Net Ionic equation:

Cu∧+2 +4NH3 →  [Cu(NH3)4]∧+2

S04∧-2 are spectator ions.

Properties and uses of Tetraaminecopper(ll) sulfate:

1. It is solid compound.

2. Its color is dark blue.

3. It has ammonia like odor.

4. It is used to make the copper compounds and also used in the printing of fabric.

5. It is also used as pesticide.

3 0
3 years ago
Other questions:
  • An ___is usually a homologous structure that is shared by all organisms in a group~science
    6·1 answer
  • What do we call the process by which cells obtain the energy that they need?
    15·1 answer
  • For the diprotic weak acid h2a, ka1 = 3.2 × 10-6 and ka2 = 6.1 × 10-9. what is the ph of a 0.0650 m solution of h2a? what are th
    13·1 answer
  • Dose mitochondria make necessary chemicals for the cell
    13·1 answer
  • Phosphorus trichloride gas is formed by the reaction of solid phosphorus and chlorine gas . Write a balanced chemical equation f
    5·1 answer
  • What are simple sugars
    10·1 answer
  • What mass of sodium hydroxide is needed to make 12.5 L of a 0.150M solution?
    8·1 answer
  • PLS HELP ME WILL GIVE BRAIN THINGYYYYY
    6·1 answer
  • You have been asked to organize the following aqueous solutions: HCl, NaOH, H2SO4,Ca(OH)2, LiOH, and HCIO3.How would you group t
    8·2 answers
  • What is meant by adhesive property of water?​
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!