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
s344n2d4d5 [400]
3 years ago
14

You are given 230 grams of a substance with a half-life of 0.75 years. How much will remain after 3 years?

Chemistry
1 answer:
Degger [83]3 years ago
6 0
After 3 years, the substance will go through 4 half lives. You can do 230*(1/2)^4, which is 14.375.
You might be interested in
What has the highest ionization energy?
Inessa [10]
<span>the highest ionization energy is Be, it is higher and righter than other elements in periodic table, so it harder to remove electron from its atom</span>
5 0
3 years ago
The same reaction is begun with an initial concentration of 0.05 M O3 and 0.02 M NO. Under these conditions, the reaction reache
Ivahew [28]
The balanced equation of the reaction is:

O3(g) + NO (g) → O2 (g) + NO2 (g)

Then the ratios of reaction is 1 mol O3 : 1 mol NO : 1 mol O2 : 1 mol NO2

If you have initially 0.05 M of O3 and 0.02 M of NO, the reaction will end when all the NO is consumed.

The by the stoichiometry 0.02 mol of O3 will be consumed in 8 seconds.

And the rate of reaction is change in concetration divided by the time.

The change in concentration in O3 is 0.02 M

Then, the rate respect O3 is 0.02 M / 8 seconds = 0.0025 M/s
8 0
3 years ago
Do metals gain or lose electrons as they form ions
Anna71 [15]

Answer:

They usually lose electrons to form ions with 2 positive charges

Explanation:

6 0
3 years ago
Read 2 more answers
Given the following values of pKa, determine which is the weakest base of the answers listed. Acid pKa HClO2 1.95 HClO 7.54 HCOO
professor190 [17]

Answer:

HClO 7.54

Explanation:

Hypochlorous acid (HClO) is a weakest acid because the pKa value of Hypochlorous acid is very high among the options given in the activity. pKa is a method which is used in order to identify the strength of an acid. The higher the value of pKa of a liquid, lower the strength of an acid while lower the value of pKa of chemical, higher the strength of an acid. In the options, HClO2  is a strong acid due to high lower pKa value.

4 0
3 years ago
Select the correct answer. Given: 2Al + 6HCl → 2AlCl3 + 3H2 If the chemical reaction produces 129 grams of AlCl3, how many grams
ivann1987 [24]

The reaction produces 2.93 g H₂.

M_r:                        133.34  2.016

        2Al + 6HCl → 2AlCl₃ + 3H₂

<em>Moles of AlCl₃</em> = 129 g AlCl₃ × (1 mol AlCl₃/133.34 g AlCl₃) = 0.9675 mol AlCl₃

<em>Moles of H₂</em> = 0.9675 mol AlCl₃ × (3 mol H₂/2 mol AlCl₃) = 1.451 mol H₂

<em>Mass of H₂</em> = 1.451 mol H₂ × (2.016 g H₂/1 mol H₂) = 2.93 g H₂

7 0
3 years ago
Other questions:
  • Define ""green chemistry"" and ""ecological footprints"".
    11·1 answer
  • Electronic configuration for Cr, Cu, Cr+2, Cu+2, Mn+2
    10·2 answers
  • PLEASE HELP ASAP
    7·1 answer
  • 8. An atom has 9 protons, which element is it?​
    14·2 answers
  • Each of the identical volumetric flasks contains the same solution at two different temperatures. There are two identical volume
    7·1 answer
  • For which of the following molecules or ions does the following description apply? "The bonding can be explained using a set of
    12·2 answers
  • Pls help I’m about to cry I cant do this it’s due in ten min
    11·1 answer
  • Lithium (Li): 1s 2sB<br> A=<br> B=
    8·1 answer
  • Which adaptation helps a tapeworm attach itself to the intestines of its host?
    5·2 answers
  • A 50.0 ml beaker contains 680. g mercury what is the density of mercury
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!