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
valentinak56 [21]
3 years ago
8

A radioactive substance decays exponentially. a scientist begins with 120 milligrams of a radioactive substance. after 14 hours,

60 mg of the substance remains. how many milligrams will remain after 19 hours?
Chemistry
1 answer:
Yanka [14]3 years ago
4 0
First thing is you have to find the half life of the substance. The half life equation is
Final Mass = Initial Mass * 0.5^(time/time per half life)
Now we substitute the values given and we get
60 mg = 120 * 0.5^(14/t)
Solve for t and you get
t = 14 hours
Now plug 19 into the equation
Final Mass = 120 * 0.5^(19/14)
Final Mass = 46.84 mg
You might be interested in
Which of the following best describes the result of using a catalyst in a chemical reaction?
elena-14-01-66 [18.8K]
A catalyst only speed up a chemical reaction
D is correct
8 0
3 years ago
Read 2 more answers
What I need help fast!
ozzi
The correct answer would be 3
3 0
2 years ago
What are alkenes used to make?
evablogger [386]

Answer:

By far the most important use of alkenes is in the making of plastics as plastics are used in almost everything.

Explanation:

Alkenes themselves aren't used much in everyday life however Alkenes are very important to industrial synthesis as it is relatively easy to turn them into other things.

Alkenes can be turned into polymers or plastics through addition reactions and the most common ethene is turned into everything from plastic bags to bottles.

Alkenes can also be turned into alcohols. most commonly propene is used as a feedstock to produce butanol and other products useful in industry or for production

Explanation:

Can you be my friend in here

3 0
3 years ago
Read 2 more answers
How are hypotheses different from theories?
juin [17]

Answer:

Explanation:

This is the Difference Between a Hypothesis and a Theory. In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data.

4 0
3 years ago
3 examples of potential energy
spin [16.1K]
The potential energy .. 
1- when a rubber band is stretche and waiting to be released 
2- an acorn hanging from a oak tree
3- a pice of celery 

4 0
3 years ago
Other questions:
  • What is the molarity of a solution made by dissolving 18.4 g of potassium perchlorate in enough water to fill a 300.00 mL volume
    10·1 answer
  • How does carbon enter soil?
    7·2 answers
  • What ahppens when you free lava?
    6·2 answers
  • .....................................................................
    7·1 answer
  • What is the term for a bond composed of two electron pairs shared between two atoms? double bond triple bond electrovalent bond
    13·1 answer
  • Match the following:Part A1. Hydrolysis reaction: 2. Dehydration synthesis: 3. Decomposition reaction: 4. Synthesis reaction: Pa
    11·1 answer
  • A 0.060 kilogram ice cube at 0.0 degrees celsius is placed in a glass containing 0.250 kilograms of water at 25 degrees celsius.
    14·2 answers
  • HELP ASAP ILL GIVE YOU 40 POINTS IF YOUR CORRECT!
    14·2 answers
  • *CHEMISTRY*
    5·2 answers
  • Which green house gas is produced by commercial refrigeration and air conditioning systems
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!