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A sample of pure calcium chloride is prepared in a laboratory. A small but measurable amount of the calcium in the compound is made up of calcium- 47 atoms, which a...

Question

A sample of pure calcium chloride is prepared in a laboratory. A small but measurable amount of the calcium in the compound is made up of calcium- 47 atoms, which are beta emitters with a halflife of 4.35 days. The compound is securely stored for a week in an inert atmosphere. When it is used at the end of that period, it is no longer pure. Why? With what element would you expect it to be contaminated?

A sample of pure calcium chloride is prepared in a laboratory. A small but measurable amount of the calcium in the compound is made up of calcium- 47 atoms, which are beta emitters with a halflife of 4.35 days. The compound is securely stored for a week in an inert atmosphere. When it is used at the end of that period, it is no longer pure. Why? With what element would you expect it to be contaminated?



Answers

Calcium $-47$ is a $\beta^{-}$ emitter with a half-life of 4.5 days. If a bone sample contains 2.24 g of this isotope, at what rate will it decay?

We're gonna assume that we're working with the 100 grand sample. What that does is allows us to change these into Graham so that we can devise one but its respective more like so, which we will Clinton. And another reason more quantities. Right. Empirical formula Number of people for west ulcers something mold in comparison. The number of atoms given by the numbers You need a whole number multiple ratio. Find that moved by this smallest value to get more ratios. Tell soon you zero That should be Miss Rhode. Carbon is wonderful. Geo zero oxygen this 4.0 So we took the data and we use it to find an empirical formula which is council to carbon. 04 The problem is, we expected this to the calcium carbonate. The calcium carbonate has a formula of csto three and if the sample truly waas 100% entirely calcium carbonate in this day that she was given this formula because it does not, we find that the sample is not pure because two formulas do not match up

This question says calcium chloride is a strong electrolyte and is used to salt streets in the winter to melt ice and snow that it asks us to write a reaction to show how this substance breaks apartment. It dissolves in water. So here's how Here's the symbol for calcium chloride. It was solved in water. Break into its individual ions because it's a strong electrolyte. Those air calcium, just a two plus charge, acquiesced when it's in water and chloride ions. But we have two of them, and that's have a negative one charge. So this the equation for sodium chloride dissolving in water.

This question, says a 1.42 gram sample of a pure compound with formula and two s. A four was dissolved in water and treated with excess. Calcium chloride equals calcium chloride, resulting in the precipitation of all of the sulphate ions. As calcium sulfate says the precipitate was collected, dried and found a way 1.36 grams and wants us to determine the atomic massive em and figure out which Adam and Represents written out what that equation would look like. And to us 04 mixed with excess calcium chloride to form calcium sulphate, the precipitate. And then one of the remaining compound must be M. C. L. Because it takes the cat eye on from two s, a four and the anti from calcium chloride. We can balance this real quick. There are two M's and to Gloria's on the left, but only one each on the right. Putting it to hear balances This equation. It tells us that we have 1.36 grams of calcium sulfate at the end, and we know the molar mass of calcium sulfate so we can simply figure out how many moles of calcium sulfate there are. We know that, um the more mass is 136 0.14 grams per one mole of calcium sulphate. Then, based on this balanced chemical equation we have up here, we can convert between moles of calcium sulphate and moles. M two s 04 That's a 1 to 1 ratio Here. Uh, this is one more calcium sulfate. 1 to 1 with him to us afore should be it from here and with this mean cancel out units. Grams cancels, moles, cancels We're left with moles of M two s 04 This answer is 0.1 moles of M two s 04 So, based on the mass of precipitate formed, we can figure out what the number of moles of M two s a four is. Thankfully, it tells us that they put 1.42 grams of m two s 04 into the reaction to begin. And if we divide this number by the number of moles that we know, we're in their 0.1 moles. Mmm two s 04 We can figure out the molar mass. And if you do this, you would can answer of 142 grams per mole is the more massive M two s 04 And we know what the mass of bull a massive sulfate is. That's about 96 screams from all grams per mole. It's division sign grams per mole, and we know that this molecule has two m's per molecule. Someone divide this by two. So the more massive them to us A four minus the bullet massive. The sulphate ion divided by two will give us the solar mass of em. And I wanted the, um, atomic master right this Antarctic massacres. But that would be about 23 atomic mass units. And if you look at your PR table, that is sodium.

This question is testing radio activity damage so strong him. 90. It's al clean Earth matter having chemical properties similar to calcium, which means strong Liam, 90 can incorporate into calcium rich tea shoes such as the bones. Wasi embody the inside of a human body. The Spate. A producer will produce a lot of beta particles, which can do significant damage to human tissue. On reading to To. To read into two is a noble gas, so you may think ribbon to to to doesn't cause much damage because it's reactively would pass through the human body fairly quickly, which is true. But the thing is, when reading, too too, too, was in the lungs. There are quite a lot off radiation. Human humans happened, and it produced a lot off alfa particles, which could cause ionization ALS human T shoes.


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