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3 years ago

What is the half-life of a radioisotope?

Chemistry

2 answers:

never [62]3 years ago

4 0

A.The amount of time it takes for half of the material to decay

Svetlanka [38]3 years ago

4 0

The answer to your question is OPTION A

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Write the complete balanced equation for the neutralization reaction that occurs when aqueous hydroiodic acid, HI, and sodium hy

Serhud [2]

Answer:

H+ ( aq ) + HCO3- ( aq ) ------> H2O( l ) + CO2 ( g )

Explanation:

The complete reaction when hydroiodic acid and sodium hydrogen carbonate combine, would be as follows -

HI + NaHCO3 ----> NaI + H2O + CO2

net reaction

H2CO3 is highly unstable, and thus decomposes into the water and carbon dioxide you see present as the reactants. If you didn't know already, H2CO3 is also reffered to as carbonic acid. The rest of the elements present on the reactant side are Iodine and Sodium, which is why they are present on the product side as NaI.

Let me include the " physical states " in this reaction as well -

HI ( aq ) + NaHCO3 ( aq ) ----> NaI ( aq ) + H2O ( l ) + CO2 ( g )

Now the complete ionic equation would simply be each compound present as ions in an aqueous solution, so there is no need for an explanation on this step -

H+ ( aq ) + I- ( aq ) + Na+ ( aq ) + HCO3- ( aq ) -------> Na+ ( aq ) + I- ( aq ) + H2O( l ) + CO2 ( g )

The spectator ions in this reaction are I- and Na+, so canceling them out, you would receive the following net ionic equation -

H+ ( aq ) + HCO3- ( aq ) ------> H2O( l ) + CO2 ( g )

Hope that helps!

4 0

3 years ago

A gecko used its sticky feet to crawl from the bottom of a window to the top of

sp2606 [1]

Answer:

Decreased

Explanation:

You're faster when you go downhill than you are uphill.

8 0

3 years ago

Ar (g) is placed in a 3.80 L container at 320 K. The gas pressure is 0.496 atm.

nata0808 [166]

Answer:

PV=nRt

Therefore n(number of moles)=PV/RT

=>(0.49×3.80)/(0.08206×320)

Therefore Number of moles is = 0.071mols

Explanation: By using the Real gas equation..

PV=NRT .

We can solve for the number of moles of Ar by making N the subject..

Always make sure you pressure is In atm, your Volume is in Litres and temperature in degree Kelvin.

Also Recall the universal gas constant R used in this type of questions which is 0.08206.

Hence l, by making N the subject we get our answer as

3 0

3 years ago

Write 151.5 cm to meters in the correct significant figures

iogann1982 [59]

Answer:

1.515m

hope that helps uh :)

3 0

2 years ago

C3h8 + 5 o2 --> 3 co2 + 4 h2o this is an example of a _______________.

drek231 [11]

Answer:
combustion reaction

Explanation:
In chemistry, a combustion reaction is defined as a reaction between an oxidant and any compound that leads to the production of another compound along with a huge amount of heat.

Now, let's check the reaction given:
C₃H₈ + 5 O₂ --> 3 CO₂ + 4 H₂O
The oxidant is oxygen gas
The compound reacting is propane
The compound produced is carbon dioxide along with water vapor and heat

Therefore, the given reaction is a combustion reaction

Hope this helps :)

5 0

3 years ago

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