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
Aleonysh [2.5K]
3 years ago
5

> Ha

Chemistry
1 answer:
kodGreya [7K]3 years ago
5 0

Answer:

7.5 hours

Explanation:

half life is the a period of time the sample takes to be half the amount it started the period with

it means we can express it as

original amount / (2^n) = current amount

where n is the number of periods

in the problem if we put 100 / (2^n) = 6.25

we will find that n = 4

we divide 30 over 4 and we get that half life of each period will be equal to 7.5

You might be interested in
SOMEONE HELP ME PLEASE!!! ILL GIVE BRAINLY
nevsk [136]

Answer:

the answer is c

Explanation:

My reasoning is that its most likely

6 0
3 years ago
Balance the equation with the correct coefficients.
Dmitry [639]

Explanation:

In general, to balance an equation, here are the things we need to do:

Count the atoms of each element in the reactants and the products.

Use coefficients; place them in front of the compounds as needed.

7 0
3 years ago
Which tool was most likely used in a procedure if the lab report shows 300ml of water was used
maxonik [38]
A graduated cylinder, it measures the exact amount of liquid used.
3 0
4 years ago
Please help!! Need to know what it is!
Kamila [148]

Answer:

The correct answer will be 15

7 0
3 years ago
Read 2 more answers
An atom of argon has a radius rar = 88 pm and an average speed in the gas phase at 25°C of 172 m/s.
Rudik [331]

Answer:

1.2* 10³ rNe.

Explanation:

Given speed of neon=350 m/s

Un-certainity in speed= (0.01/100) *350 =0.035 m/s

As per heisenberg uncertainity principle

Δx*mΔv ≥\frac{h}{4\pi }

4π

h

..................(1)

mass of neon atom =\frac{20*10^{-3} }{6.22*10^{-23} } =3.35*10^{-26} kg

6.22∗10

−23

20∗10

−3

=3.35∗10

−26

kg

substituating the values in eq. (1)

Δx =4.49*10^{-8}10

−8

m

In terms of rNe i.e 38 pm= 38*10^{-12}10

−12

Δx=\frac{4.49*10^{-8} }{38*10^{-12} }

38∗10

−12

4.49∗10

−8

=0.118*10^{4}10

4

* (rNe)

=1.18*10³ rN

= 1.2* 10³ rNe.

Explanation:

This is the answer

7 0
3 years ago
Other questions:
  • Acid-dissociation constants of two acids are listed in the table above. A 20. mL sample of a 0.10 M solution of each acid is tit
    6·2 answers
  • According to the Arrhenius theory, when a base
    10·1 answer
  • How many mol of hydrogen in 2.8 mol of caffeine.
    5·2 answers
  • The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in diethyl et
    14·1 answer
  • 27. Fire stations, roads, sewers, and bridges are examples of
    12·1 answer
  • An ionic compound is found to contain 10.9% magnesium, 31.8% chlorine and 57.3% oxygen. What is the empirical formula for this c
    15·2 answers
  • Od<br> HXO(s)<br> HX(s)<br> O2 (g)<br> Balanced Ratio?
    9·1 answer
  • Hurry Quickly!!!!!
    8·1 answer
  • What is the mass of 2.9 moles of calcium? Show all work!
    10·1 answer
  • How does the lithosphere affect wildfires
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!