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Explain why the hip replacement made of nanocrystalline metal should last longer than one made of normal metals?
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When predicting the products for a single replacement reaction what should you refer to?
This is the reactivity series of metals.
Why do plastics have a lower melting point than metals explain in terms of chemical bonding?
Metals have metallic bonds which plastics lack.Plastics lack delocalised electrons that are found in 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.
How can you use the word stable to explain why the alkali metals tend to lose valence electrons?
Alkali metals, have only one valence electron so they will "want" to lose it to achieve a stable electron arrangement.
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 (-).
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?
Nanocrystalline crystals are 20-100nm while normal metals is 20,000nm in diameter.
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 why metals react with non-metals.?
The simplest explanation is that metals have valence electrons to give away, and non metals need extra electrons to complete their valence shell.
When predicting the products for a single replacement reaction what should you refer to?
This is the reactivity series of metals.
Can all elements on the periodic table be classified as metals or non metals Explain?
Apart from metals and non-metals, metalloids are also present. Transition elements are also present in periodic table.
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
Why do plastics have a lower melting point than metals explain in terms of chemical bonding?
Metals have metallic bonds which plastics lack.Plastics lack delocalised electrons that are found in metals.
Can all elements on the periodic table be classified as metals or nonmetals explain?
The elements are classified as metals and non metals. Apart from this, there are elements that are metalloids, transition elements, inert in nature.
How can the Boer model of atomic structure be used to explain the reactivity of the alkali metals?
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Explain why are alloys a useful improvement over pure metals?
Alloys are useful improvement over pure metals because they tend to be stronger.
