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How are crystals different in a nanocrystalline than in a metal?
Crystals in a nanocrystalline material consist of grains that are typically on the order of nanometers in size, resulting in a high volume fraction of grain boundaries compared to conventional metals, which have larger grains. This fine microstructure leads to unique mechanical properties, such as increased strength due to grain boundary strengthening and enhanced hardness. Additionally, nanocrystalline materials may exhibit different electrical and thermal conductivity behaviors due to their small scale and increased surface area. In contrast, conventional metals tend to have more uniform properties due to their larger, well-defined crystal structures.
When predicting the products for a single replacement reaction what should you refer to?
This is the reactivity series of metals.
WHAT IS THE RULE FOR REPLACEMENT REACTIONS?
Metals which have the ability to easily lost electrons replace the others.Halogens which have the ability to gain electrons replace the others.
Is an ion a class on the periodic table?
No. The three classes of the periodic table are metals, semi metals and non metals. Ions are atoms that are missing one or more electrons, resulting in a net charge. This is because the number of protons (+) no longer equals the number of electrons (-).
In single replacemant reactions metals lower on the activity chart replace higher metals on a higher chart true of false?
True. Metals lower on the activity chart are more reactive and can displace metals higher on the chart in single replacement reactions. This is because the more reactive metal is better able to give up electrons and form positive ions in the reaction.
Why would a hip replacement made of nanocrystalline metal last longer than one made of normal metals?
It has more particles with more bonds, meaning it makes it more sturdy and stronger.
How is the size of crystals in nanocrystalline metals different from the size of crystals in normal metals?
The size of crystals in nanocrystalline metals is on the order of nanometers, much smaller than in normal metals where they are typically on the order of micrometers. This results in a higher density of grain boundaries in nanocrystalline metals, which can lead to enhanced mechanical properties such as increased strength and hardness. Additionally, the smaller grain size can also impact other properties such as thermal stability and electrical conductivity.
When predicting the products for a single replacement reaction what should you refer to?
This is the reactivity series of metals.
Explain why other elements are often mixed with metals to make alloys?
Alloys have improved features compared with single metals.
Explain the Reactions of alkali metals in cold water?
It will react vigourisly
In order to predict whether or not a single replacement reaction takes place you need to consult a chart that shows what?
In order to predict if a single replacement reaction will occur, you need to consult the activity series chart for the metal involved. This chart lists metals in order of reactivity, with the more reactive metals displacing ions of less reactive metals in a solution. If the metal you are considering is higher on the activity series than the metal it is trying to replace, a single replacement reaction will most likely occur.
How can the Boer model of atomic structure be used to explain the reactivity of the alkali metals?
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What is a single reaction a dublle replacement reaction?
You can identify a single replacement reaction because the reactants are a compound + an element. The products of a single replacement reaction are found by switching the element with another element in the compound. Metals switch with metals, non-metals switch with non-metals, and the most reactive element is always in the compound. A double replacement reaction can be identified because the reactants are always compound +compound. The products would also be two compounds but the elements would switch.
Explain the differeny kind of metals?
ferrous metals - iron etc (normaly shiny) non-ferrous - aluminum etc (normal dull)
Explain why are alloys a useful improvement over pure metals?
Alloys are useful improvement over pure metals because they tend to be stronger.
How does the nature of the metallic bond explain the observation that most metals can be drawn into a wire?
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Explain Trace metals Heavy metals Give examples?
Poisoning and disease can occur due to human exposure to trace quantities of heavy metals. Common trace metals include mercury (Hg), arsenic (Ar) and lead (Pb).
