781 J
Lab Request
Not sure I understand your question. Anything that gets accidentally added to a sample substance is a contamination. As such, gunpowder can contaminate a blood sample. But it is unusual to handle gun Powder, so how gunpowder would get into a blood sample is beyond me.
No, adding more silver to a silver block would not change its density. Density is a physical property that remains constant regardless of the amount of the material present. The volume of the block would increase if you add more silver, but the density would remain the same.
The deviation would be how much off it would be off. Since this is a sample, it is impossible to get completely accurate results.
The Cananda, and Alaska, models may, but the US models would have had to have it added as a option.
An excess of copper oxide is added to ensure that all the sulfur present in the original sample reacts to form copper sulfide. This is important for accurate determination of sulfur content in the sample, as any unreacted sulfur would lead to an underestimate of sulfur content. The excess copper oxide also helps to ensure complete combustion of the sample.
Since each molecule of sodium chloride contains one sodium atom, the mass of the sodium in a 150 gram sample of sodium chloride would be the same as the mass of the sample itself, which is 150 grams.
it would probably start fizzing since it would start a reaction
24 kilograms. I say this because 8kg plus half a block is a whole block. The half a block has to be also 8 kg making a whole block weigh 16 kg. Now 1 block (16kg) plus half a block (8kg) added together is 24kg
* you have to, or they will proclaim you guilty since you won't give it to them you have to, or they will proclaim you guilty since you won't give it to them * You would be charged with 'failing to provide a specimen' or perhaps 'witholding evidence', whether you refused to give a urine/DNA/breath sample.
The density of the glass has not changed, but since air is less dense than glass, the density of the block has decreased.
You would need a tool called a density meter or a hydrometer to measure the density of a block of wood. This device works by comparing the weight of the wood sample to the volume of water displaced by the wood when submerged. The density of the wood can then be calculated based on these measurements.