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
Setler79 [48]
1 year ago
12

A certain radioactive isotope has a half life of one hour. I you start with 1.0 g of the material at 1:00 P. M., how many grams

will be present at 2:00 P. M. on the same day
Chemistry
1 answer:
geniusboy [140]1 year ago
6 0

A certain radioactive isotope has a half life of one hour. I you start with 1.0 g of the material at 1:00 P. M. 0.5 grams will be present at 2:00 P.M. on the same day.

<h3>What is half Life ?</h3>

Half life is the amount of time required to reduce to one half of its initial value. The symbol of half life is t_{1/2}.

<h3 /><h3>How to calculate the quantity remaining when half life given ?</h3>

It is expressed as:

N_{t} = N_{0} (\frac{1}{2})^{n}

where,

N(t) = quantity remaining

N₀ = initial quantity

n = half life that have passed

Now put the values in above expression we get

N_{t} = 1.0\ g \times (\frac{1}{2})^{1}

     = \frac{1}{2} g

      = 0.5 gram

Thus from the above conclusion we can say that A certain radioactive isotope has a half life of one hour. I you start with 1.0 g of the material at 1:00 P. M. 0.5 grams will be present at 2:00 P.M. on the same day.

Learn more about the Half life here: brainly.com/question/25750315

#SPJ4

You might be interested in
If you are my friend come talk to me
hodyreva [135]

Answer:

what up

Explanation:

How are ya

4 0
2 years ago
Consider the following reaction at constant P. Use the information here to determine the value of ΔSsurr at 355 K. Predict wheth
Elena-2011 [213]

Answer:

\Delta S_{surr} = + 0.32113\: kJ/K

Explanation:

Given: Entropy of surrounding: ΔSsurr = ?

Temperature: T= 355 K

The change in enthalpy of reaction: ΔH = -114 kJ

Pressure: P = constant

As we know, ΔH = -114 kJ ⇒ negative

Therefore, the given reaction is an exothermic reaction

Therefore, Entropy of surrounding at <em>constant pressure</em> is given by,

\Delta S_{surr} = \frac{-\Delta H}{T}

\therefore \Delta S_{surr} = -\left (\frac{-114 kJ}{355 K}  \right ) = + 0.32113\: kJ/K > 0

<u><em>In the given reaction:</em></u>

2NO(g) + O₂(g) → 2NO₂(g)

As, the number of moles of gaseous products is less than the number of moles of gaseous reactants.

\therefore \Delta S_{system} <  0

As we know, <em>for a spontaneous process, that the total entropy should be positive.</em>

\Delta S_{total} = \Delta S_{surr} + \Delta S_{system} > 0  

<u>Therefore, at the given temperature,</u>

  • if \Delta S_{surr} > \Delta S_{system} \Rightarrow \Delta S_{total} > 0 then the given reaction is spontaneous
  • if \Delta S_{surr} < \Delta S_{system} \Rightarrow \Delta S_{total} < 0 then the given reaction is non-spontaneous
6 0
3 years ago
How many atoms of oxygen are present in the reactants and products? 6CO2+6H2O-&gt; C6H12O6+6O2
REY [17]
6 Carbon atoms
18 Oxygen atoms
12 Hydrogen atoms
6 0
3 years ago
In the reaction,
jonny [76]

Answer:

In the reaction, Fe2+ is oxidized and MnO4- is reduced (option c.)

Explanation:

MnO₄⁻   +  5Fe²⁺  + 8H⁺ ---> Mn²⁺  +  5Fe³⁺  +  4H2O

Look all, the oxidation number.

Increase the oxidation number means, oxidation.

Decrease the oxidation number means, reduction.

Fe²⁺ → Fe³⁺ is increasing, the ox. number. Fe is oxidizing.

In MnO₄⁻, the Mn acts with +7, so in Mn²⁺ has decrease the ox. number.

Mn has reducted.

5 0
2 years ago
You have a 100 ml stock solution of 100 mg/ml ampicillin in deionized water. You want to make 30 ml of 25 mg/ml ampicillin in de
Georgia [21]

Explanation:

Volume of the stock solution is V_{1} = ?

Initial concentration of ampicillin is M_{1} = 100 mg/ml

Final volume (V_{2}) = 30 ml

Final concentration of  ampicillin (M_{2}) = 25 mg/ml

Therefore, calculate the volume of given stock as follows.

              M_{1} \times V_{1} = M_{2} \times V_{2}

Now, putting the given values into the above formula as follows.

            M_{1} \times V_{1} = M_{2} \times V_{2}

            100 mg/ml \times V_{1} = 25 g/ml \times 30 ml    

                   V_{1} = 7.5 ml

Now, we will calculate the volume of water added into it as follows.

            Volume of water added = V_{2} - V_{1}

                                                  = 30 ml - 7.5 ml

                                                  = 22.5 ml

Thus, we can conclude that required solution is 22.5 ml of deionized water.

3 0
3 years ago
Other questions:
  • Use the periodic table to answer the questions below.
    8·2 answers
  • What mass of hydrogen gas can be produced by 6.0 mol of aluminum with hydrochloric acid?
    7·1 answer
  • 2. What does the diamond-shaped symbol stand for in a consumer product label?
    9·1 answer
  • At what distance would radiation cease completely
    9·1 answer
  • Most minerals on Earth's surface contain which of the following​
    5·1 answer
  • Acetic acid has a boiling point of 118.5 C and a boiling point constant of 3.08. What is the boiling point of a 3.20 m solution
    10·1 answer
  • Which physical change is endothermic
    14·1 answer
  • A sample of oxygen occupies a volume of 150 cm3 at 72 C. What will be volume of oxygen when the temperature drops to 2 C?
    5·2 answers
  • How did the different reform movements we've discussed change and shape America?<br> Pls help
    8·1 answer
  • What are the benefits of taxes? What is the relationship between taxes and the government?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!