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
timofeeve [1]
3 years ago
7

what is the half life isotope if after 21 days you have 31.25 g remaining from a 250.0 g starting sample size?

Chemistry
1 answer:
alexgriva [62]3 years ago
3 0

250 --> 125 --> 62.5 --> 31.25


each arrow equals one half life, so 3 half lives


14 days/ 3 half lives =


4.67 days = half life

You might be interested in
Nitric acid with a concentration of 1mol/dm has a pH
goldenfox [79]
Water is neutral with ph 7. when we add water to acidic solution, it will be less acidic. so the pH of acid increases
6 0
2 years ago
The smallest unit of an element that retains all the characteristics of that element is called a(n)
Maksim231197 [3]
<span>The smallest unit of an element that retains all the characteristics of that element is called an A. atom.
Atoms consist of protons, electrons, and neutrons, but they are particles and don't have the characteristics of the element which is why D is incorrect. B and C are not the smallest units - atoms are smaller than them.
</span>
3 0
3 years ago
8. What is diabetes?
Ghella [55]

Answer:

Diabetes is a disease that occurs when your blood glucose, also called blood sugar, is too high. Blood glucose is your main source of energy and comes from the food you eat. Insulin, a hormone made by the pancreas, helps glucose from food get into your cells to be used for energy. Sometimes your body doesn’t make enough—or any—insulin or doesn’t use insulin well. Glucose then stays in your blood and doesn’t reach your cells.

Over time, having too much glucose in your blood can cause health problems. Although diabetes has no cure, you can take steps to manage your diabetes and stay healthy.

6 0
3 years ago
Read 2 more answers
PLZ HELP PLZ PLZ ILL MARK AS BRAINLIESTT!!!!
LuckyWell [14K]

Q.1-

Given,

mass - 10grams

volume - 24 cm³

density = mass/volume

density = 10/24

density = 0.416 g/cm³

Q.2-

Given,

mass - 700grams

volume - 1100cm³

density = mass/volume

density = 700/1100

density = 0.6363 g/cm³

5 0
3 years ago
Which is a physical characteristic of a fish?
Nitella [24]

Answer:

Gill's

Explanation:

Fish's have many characteristics that differ from humans, and one of them is the gills.

3 0
3 years ago
Other questions:
  • Which statements are true? The oxidation number for Cu(s) is +2. An oxidizing agent gains electrons. Na+ is formed from the redu
    10·2 answers
  • How can etymologies help you know the meanings of scientific terms ?
    12·2 answers
  • Which substance has vibrating particles in fixed positions? Ca(S) or CaCl2 (aq)
    9·1 answer
  • What is the word for mixture of solids and water, plz an accurate answer, otherwise report.
    15·1 answer
  • What is the mass , in kilograms of a large dog that weights 441 newton
    9·1 answer
  • In an exothermic reaction the bonding energy of the product is:
    6·2 answers
  • The ionization potential of Be atom is more than expected because it has -
    14·2 answers
  • What is the pH of water?
    8·1 answer
  • Pleaseeeee guysssss
    14·1 answer
  • What is one way that potential energy might be involved in rescue team missions?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!