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
omeli [17]
3 years ago
12

The radioactive isotope z has a half-life of 12 hours. after 2 days, the fraction of the original amount remaining is

Chemistry
1 answer:
nataly862011 [7]3 years ago
4 0
.5•.5•.5•.5=1/2•1/2•1/2•1/2=1/4•1/4=1/16
You might be interested in
sp2 hybrid orbitals have 1. trigonal bipyramidal symmetry. 2. linear symmetry. 3. tetrahedral symmetry. 4. trigonal planar symme
Cloud [144]

Answer:

4. trigonal planar symmetry.

Explanation:

The sp2 hybridization is formed with one s and two p atomic orbitals and form  trigonal planar symmetry. In sp2 hybridization, there are same valence shell in both the orbitals and it gives three equivalent sp2 hybridized orbitals that are separated by 120 degrees giving trigonal planar symmetry.

Hence, the correct answer is "4. trigonal planar symmetry.".

7 0
3 years ago
A sample of pure tin metal is dissolved in nitric acid to produce 15.00 mL of solution containing Sn2+. When this tin solution i
Rudik [331]

Answer:

1.00 M

Explanation:

Sn^2+ reacts with KMNO4 as follows;

5Sn^2+(aq) + 2MnO4^-(aq) + 16H^+(aq) ----> 5Sn^4+(aq) + 2Mn^+(aq) + 8H2O(l)

The number of moles of MnO4^- reacted = 42.1/1000 L × 0.145 mol/L

= 0.0061 moles

If 5 moles of Sn^2+ reacts with 2 moles of MnO4^-

x moles of Sn^2+ reacts with 0.0061 moles of MnO4^-

x= 5 × 0.0061/2

x= 0.015 moles

Since the volume of the Sn^2+ solution is 15.00mL or 0.015 L

number of moles = concentration × volume

Concentration = number of moles/volume

Concentration= 0.015 moles/0.015 L

Concentration = 1 M

6 0
3 years ago
Why are the average atomic masses of some of the elements in parentheses?
Pie
Because its only representing the most stable isotope of that element but its considered the atomic mass and not average atomic mass
4 0
3 years ago
An experiment produced 0.10 g CO2 with a volume of 0.056 L at STP. If the accepted density of CO2 at STP is 1.96 g/L, what is th
Mandarinka [93]
The experimental density of CO2 at STP is 0.10/0.056=1.78 g/L. The percent error equals to (1.96-1.78)/1.96*100%=9.18%. So the answer is 9.18%.
3 0
3 years ago
What is the angle between the carbon-sulfur bond and the carbon-nitrogen bond in the thiocyanate ( SCN− ) ion?
KIM [24]
I’m not completely sure
4 0
3 years ago
Read 2 more answers
Other questions:
  • Why do tropical cyclones spawn around ? please include 5 sentences
    15·1 answer
  • Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete
    15·2 answers
  • What is the chemical formula of the ionic compound that forms from potassium and bromine?
    14·1 answer
  • Materials of low mass are combined to form a substance of higher mass during ____. a. fission c. both A and B b. fusion d. neith
    14·1 answer
  • What is the number of grams of cl2 formed when 0.485 mole HCl reacts with an excess of O2
    6·1 answer
  • protons+neutrons=_________ I need some help I cannot figure this out and its confusing and none of my notes help​
    10·2 answers
  • How many atoms are in 0.31 moles
    10·1 answer
  • Calculate the percent ionization of nitrous acid in a solution that is 0.249 M in nitrous acid. The acid dissociation constant o
    11·1 answer
  • 11. What is the maximum number of electrons that an atomic orbital can contain?
    5·1 answer
  • The mayor refused to _______ as to his margin of victory in the election.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!