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
olya-2409 [2.1K]
3 years ago
5

I give brainliest pls help

Chemistry
1 answer:
Finger [1]3 years ago
7 0

Answer:

c

Explanation:

because the fire gives off radiation

You might be interested in
A 50-mL beaker only has a scale that measures 10, 20, 30, and 40 mL. What is the uncertainty associated with the 50 mL beaker.
Juliette [100K]
If the uncertainty of a certain measurement instrument is not given, then it is assumed to be equal to half of the least count of that instrument. In this case, the least count is 10 ml, so half of this is 5 ml. Therefore, the graduated cylinder has an uncertainty of +/- 5 ml
8 0
3 years ago
What is the half-life of an isotope that decays to 6.25% of its original activity in 18.9 hours?
inessss [21]
Radioactive material obeys 1st order decay kinetics,
For 1st order reaction, we have 
k = \frac{2.303}{t}Xlog \frac{\text{initial conc.}}{\text{final conc.}}
where, k = rate constant of reaction

Given: Initial conc. 100, Final conc. = 6.25, t = 18.9 hours

∴ k = \frac{2.303}{18.9} X log \frac{100}{6.25} = 0.1467 hours^(-1)

Now, for 1st order reactions: half life = \frac{0.693}{k} =  \frac{0.693}{0.1467} = 4.723 hours.


8 0
3 years ago
How many total electrons can be contained in the 4d sublevel? <br> 2<br> 6<br> 10<br> 14
qaws [65]
<span>The s sublevel has just one orbital, so can contain 2 electrons max. The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max. And the 4 sublevel has 7 orbitals, so can contain 14 electrons max.
So, having this in mind, 10 electrons in total can be contained in the 4d sublevel.
</span>
5 0
3 years ago
Read 2 more answers
Problem Page Combustion of hydrocarbons such as pentane ( C5 H12 ) produces carbon dioxide, a "greenhouse gas." Greenhouse gases
agasfer [191]
Auuuuuhhhhhhh auhhh Frog
4 0
3 years ago
Which of the four containers represents a compound?
Arisa [49]
The answer is b)h2o is a compund
4 0
2 years ago
Read 2 more answers
Other questions:
  • Solid potassium hydroxide is slowly added to 175 mL of a 0.0621 M cobalt(II) nitrate solution. The concentration of hydroxide io
    13·1 answer
  • When the caraway seed oil is heated, which of the two components will most likely distill first?
    5·2 answers
  • Distillation is a _____________ separation technique.
    12·2 answers
  • The nadph required for co2 fixation is produced __________.
    12·2 answers
  • Question 1: Gases diffuse easily through these types of solids
    13·1 answer
  • An aqueous 0.300 M glucose solution is prepared with a total volume of 0.150 L. The molecular weight of
    7·1 answer
  • Which statement describes the energy changes that occur as bonds are broken and formed during a chemical reaction? 1.Energy is a
    8·1 answer
  • When equal moles of an acid and a base are mixed, after reaction the two are compounds are said to be at the _______________.
    13·2 answers
  • A point has no demension.​
    8·1 answer
  • The valency of both Oxygen and magnesium is 2 give reason <br><br>​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!