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
Dennis_Churaev [7]
3 years ago
5

If the half-life of a radioactive substance is 2 seconds, how much of a 100-gram sample would be left after 8 seconds?

Chemistry
1 answer:
Elan Coil [88]3 years ago
4 0
M₀=100 g
T=2 s
t=8s

m=m₀/{2^(t/T)}

m=100/{2^(8/2)}=100/2⁴=6.25 g
You might be interested in
calcium and strontium are close to one another on thw oeriodic table. what do you know about their ionization energies ,their el
Firdavs [7]

Both Ca and Sr are in Group 2 of the Periodic Table, with Sr below Ca (see image)..

<em>Ionization energies </em>

They are both metals, so they have relatively <em>low ionization energies</em>.

Sr is below Ca in the Group, so Sr has the lower ionization energy.

<em>Electron configurations </em>

Their electron configurations both end in <em>ns²</em>.

For example, the electron configuration of Ca is [Kr]<em>4s²</em> and that of Sr is [Kr]<em>5s²</em>.

<em>Physical chsrscteristics: </em>

  • metallic lustre
  • malleable
  • ductile
  • good conductors of heat and electricity

<em>Chemical characteristics</em>

Both metals react with

• <em>Hydrogen</em> to form hydrides: M + H₂ ⟶ MH₂

• <em>Oxygen</em> to form oxides: 2M + O₂ ⟶ 2MO

• <em>Nitrogen</em> to form nitrides: 3M + N₂ ⟶ M₃N₂

• <em>Halogens</em> to form halides: M + X₂ ⟶ MX₂

• <em>Water</em> to displace hydrogen: M + 2H₂O ⟶ M(OH)₂ + H₂

4 0
3 years ago
Las plantas ingieren alimentos del exterior?​
xeze [42]

Answer:

yes it is

Explanation:

b bc it is i did the test

7 0
3 years ago
In what way would readings from a digital thermometer be preferable to those from a liquid-based thermometer?
skad [1K]
I think its because its more accurate because it shows you the numbers rather than you reading the approximate temperature on a liquid thermometer 

5 0
3 years ago
Read 2 more answers
When a car engine burns gasoline, the results of the reaction are similar to when cells burn glucose. both reactions release car
-Dominant- [34]

the answer is heat. while a car is in idol, the tailpipe gets very hot, (motorcycle, car, etc.) this also produces h20 which you can see dripping out of the tailpipe.

3 0
3 years ago
What is empirical evidence
vladimir2022 [97]
The correct answer is b
7 0
2 years ago
Other questions:
  • I don’t understand this at all, if someone could help me please
    13·1 answer
  • Please help I will give you the brainiest.
    14·2 answers
  • How many neutrons does X have if it’s atomic number is 28 and it’s mass number is 71
    11·1 answer
  • A 13.5 g sample of an unknown gas occupies 5.10 L at 149.83 kPa and 301 K. What is the molar mass of the gas ?
    7·1 answer
  • Plz help me.. plzzzzzzzz
    8·1 answer
  • If an unknown liquid has a density of 0.756 g/mL and a mass of 2.00 g, what is its volume?
    14·1 answer
  • An eccentric chemistry professor (not mentioning any names) stops in every day and orders 200ml of Sumatran coffee at precisely
    11·1 answer
  • If the pressure of a gas is 2.000 × 104 kPa, what is its pressure in atm?
    10·2 answers
  • During a laboratory experiment, 46.54 grams of Al2O3 was formed when O2 reacted with aluminum metal at 300.0 K and 1.2 atm. What
    8·1 answer
  • (PLEASE HELP ASAP I WILL MARK BRAINLIEST!! C:)Which of the following is a reason why water is so important to the function of ce
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!