Which metal is more dense: Copper or Lead?
Correction to the above: Although in general a metal with a higher RAM will have a higher density, the relationship is not that simple. E.g. the two adjacent metals copper and zinc: RAM Cu = 29; density = 8.96 gcm^-3 RAM Zn = 30; density = 7.14 gcm^-3 This is because the structure of the metal is also relevant i.e. the packing together of the atoms.
Which is more dense, copper or lead?
lead density copper = 8.94 g/cm^3 density lead = 11.34 g/cm^3
Why is copper considered a metal?Metals are generally dense, malleable, ductile, reflective, and well conductive of heat and electricity, and they are oxidized in chemical reactions (they give away electrons).Copper has all these characteristics.
Which of the metals copper, lead, and zinc is the most easily oxidized? And which is the least easily oxidized
Ordinarily, I wouldn't answer such an obvious "please do my homework for me" question, but you've asked it twice and OHMYGOD nobody else has a clue what they're talking about. You need data to answer this question. Somewhere you have a list of standard reduction potentials. Go look at it. On that list there are the following three half-reactions: [Cu]2+ + 2e– ==> Cu Eº = +340 mV [Pb]2+ + 2e– ==> Pb Eº = –125 mV [Zn]2+ + 2e– ==> Zn Eº = –763 mV Those Eº values tell you, in absolute terms, the amount of energy gained or lost by doing this process if the electrons come from dihydrogen gas (forming protons). In relative terms, they tell you which reduction is most favourable, and which is the least. The more positive the Eº value, the more favoured the process. So the best one is the copper, but these are *reductions* where the electrons are being added to the cation to make the metal. What you're asking is which metal is most easily (favourably) oxidized to the cation. So reverse the reactions, and change the sign on the Eº, and see which is the most positive. Zn to [Zn]2+ is the easiest (now +763 mV), while Cu to [Cu]2+ is the hardest (now –340 mV). Which makes sense, chemically. Ever cut up a penny and thrown it in acid? The zinc core is oxidized, (Zn + 2H+ ==> [Zn]2+ + H2) but the copper on the outside doesn't react. (And yes, lead forms an oxide. A few of them, actually. Lead (II) oxide is PbO (aka litharge), lead (IV) oxide is PbO2, lead tetroxide is Pb3O4 (aka red lead, effectively a mixture of the first two). PbO2 is a component of the lead acid battery in your car.)
What metals are more dense than steel?
Density is decided by mass per unit volume. Density is largely decided by the size of the atoms of the element discussed, but not necessarily. An element such as Gold (atomic number 79) may or may not be less dense than a heavier element such as Mercury (80). Iron is (26). You can Google "density of metals" to find a list of densities for elements.
Yes, here they are:kg/litre (water = ± 1.0 kg/litre)These are all elements denser (so heavier at equal volumes) than led - I think they are all metals too, but you can check that yourself by using the periodic table.Lots of radioactivity in these fellows.The chemical elements of the periodic table sorted by density
An alloy consists of two or more metals. The density is going to be the average of the alloy ingredients. If an alloy were made of tungsten and iron, the density would be greater than iron, but less than tungsten. Similarly, an alloy of silver and gold would be denser than silver but less dense than gold.
Lead isn’t actually used for every bullet. It is certainly used for most bullets. Living in California, I can tell you that we have a lot of lead-free hunting. There were a lot of folks complaining that lead was contaminating wildlife. As an example, a hunter might shoot an animal which was able to get away, but which would then be eaten by other wildlife. Starting in July of 2015, the Department of Fish and Wildlife[1] effectively banned lead-round hunting in California.Because of this, a lot of lead-free ammunition (mostly copper) showing up. It appears to shoot just fine, but it is a fair amount more expensive.The example above runs something like $40 per 20 rounds. At $2 every time you pull the trigger (for .308 Winchester), that’s pretty expensive.I’ve also recently discovered some manufacturers making aluminum bullets.They are much lighter, so they tend to shoot a lot faster. I’ve seen some .45 ACP more than break the sound barrier.That all being said, why is lead used in most bullets? The biggest reason would be lead’s relatively low melting point. I think I smelt my lead and cast my bullets at about 650° F. That doesn’t take a lot of equipment.Here is what I use. It’s a heavy metal which is easy to work. That’s part of why it is used to make things like lead soldiers.It’s also a largely worthless metal other than to use as either a bullet or as weights for tires, fishing, etc.Footnotes[1] Nonlead Ammunition in California
Not all metals have high density. Lithium, sodium, and potassium are all less dense than water, for example.Density of a solid is a function of the masses of the individual atoms that make up the solid, and how far apart they are within the solid.The masses of the atoms increases as you move downwards in the periodic table, and indeed you generally see the most dense metals in the bottom rows.The distance between atoms in a pure metal is given by its covalent radius. There is some variation in covalent radius from element to element, especially with the alkali metals in the first column, but as you can see from the image here: Elements, Atomic Radii and the Periodic Radii, the transition metals (which, other than aluminum, are the metals that we encounter on a daily basis) have roughly constant covalent radii, so it doesn't play too big of a role in the density of those metals.So some metals are dense mostly because they're fairly far down in the periodic table. There are also some nonmetals in those lower rows, too, and they're dense as well (e.g., iodine). But the commonly encountered nonmetals are in the upper rows, which is why we tend to think of nonmetals as being relatively non-dense.There's one other factor that is involved: Most metals have either a face-centered cubic or a body-centered cubic crystal structure. The bcc structure has a little more empty space than the fcc structure, about 9%, so metals having a bcc structure are slightly less dense.