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3 years ago

What can be used to measure the ph of a substance

1 answer:

3 0

The pH value can be measured using electrochemical measuring systems, litmus paper, or indicators and colorimeters. The easiest way to take a pH measurement is to use litmus paper or a colorimeter. The advantage of this type of pH measurement is that the pH range is well known and they are easy to apply.

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The thallium Subscript 81 Superscript 208 Baseline Tl nucleus is radioactive, with a half-life of 3.053 min. At a given instant,

Genrish500 [490]

Answer: (E) 300 bq

Explanation:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

Radioactive decay process is a type of process in which a less stable nuclei decomposes to a stable nuclei by releasing some radiations or particles like alpha, beta particles or gamma-radiations. The radioactive decay follows first order kinetics.

Half life is represented by $t_{\frac{1}{2}$

Half life of Thallium-208 = 3.053 min

Thus after 9 minutes , three half lives will be passed, after ist half life, the activity would be reduced to half of original i.e. $\frac{2400}{2}=1200$ , after second half life, the activity would be reduced to half of 1200 i.e. $\frac{1200}{2}=600$ , and after third half life, the activity would be reduced to half of 600 i.e. $\frac{600}{2}=300$ ,

Thus the activity 9 minutes later is 300 bq.

7 0

2 years ago

which change in the temperature of the one gram sample of water would cause the greatest increase in average kinetic energy of i

LenaWriter [7]

Maybe about in the 50ths

8 0

3 years ago

What do genotype will appear in boxes 2 and 3?

VMariaS [17]

Tt is the genotype that will appear in boxes two and three.

If you look at the column and row that intersect to form boxes two and three, you will see that they are T and t. That is the best way I can describe it, sorry if it’s confusing.

3 0

2 years ago

Read 2 more answers

What is the symbol for an ion with a 3+ charge, 28 electrons, and a mass number of 71

zhenek [66]

Answer:

Ga3+ is a gallium cation

7 0

2 years ago

In 1901, Thomas Edison invented the nickel-iron battery. The follwing reaction takes place in the battery.

lys-0071 [83]

Answer: The number of moles of $Fe(OH)_2$ produced are, 3.60 moles.

Explanation :

First we have to calculate the limiting and excess reagent.

The balanced chemical equation is:

$Fe(s)+2NiO(OH)(s)+2H_2O(l)\rightarrow Fe(OH)_2(s)+2Ni(OH)_2(aq)$

From the balanced reaction we conclude that

As, 1 mole of $Fe$ react with 2 mole of $NiO(OH)$

So, 3.60 moles of $Fe$ react with $3.60\times 2=7.2$ moles of $NiO(OH)$

From this we conclude that, $NiO(OH)$ is an excess reagent because the given moles are greater than the required moles and $Fe$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of $Fe(OH)_2$

From the reaction, we conclude that

As, 1 mole of $Fe$ react to give 1 mole of $Fe(OH)_2$

So, 3.60 mole of $Fe$ react to give 3.60 mole of $Fe(OH)_2$

Therefore, the number of moles of $Fe(OH)_2$ produced are, 3.60 moles.

7 0

2 years ago