1
Q
why do ionic compounds have high melting points
A
- ionic bonds are very strong
- in a giant ionic lattice there are lots of ionic bonds
- it requires a large amount of energy to break all these bonds
2
Q
why do some ionic compounds have higher melting points than others?
A
- their ions have higher charges
- this makes the attraction between the ions even stronger and harder to break
3
Q
what does electrical conductivity require
A
charged particles that can move freely
4
Q
can solids conduct electricity?
A
no because the ions can’t move freely
5
Q
can liquids or aqueous solutions conduct electricity?
A
yes because the ions can move freely
chemistry
flashcards
Decks in class (57)
# Cards
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3.1.1 - chemicals and observations32
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3.1.2 - kinetic theory11
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3.1.3 - pure substance31
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3.1.4 - mixtures22
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3.1.5 - metal carbonate decomposition4
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3.2.1 - particle numbers16
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3.2.2 - electrons5
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3.2.3 - ion formation13
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3.2.4 - ionic formulae7
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3.2.5 - ionic structure and bonding4
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3.2.6 - ionic properties5
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3.3.1 - metal structure, bonding and properties14
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3.3.2 - metal reactivity and displacement reactions7
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3.4.4 - acid + metal reaction5
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3.3.4 - metal extraction11
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3.3.5 - iron, steel and other metals8
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3.4.1 - acids, bases and alkalis23
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3.4.2 - acid + base reaction5
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3.4.3 - making soluble salts8
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3.4.4 - making insoluble salts3
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3.4.6 - acid + carbonate reaction2
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4.1.1 - covalent bonding3
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4.1.2 - simple molecular substances7
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4.1.3 - giant covalent substances14
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4.1.4 - bonding summary9
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4.2.1 - group 7 elements15
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4.2.2 - halogen displacements7
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4.3.1 - collision theory13
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4.3.2 - effect of concentration/pressure7
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4.3.3 - effect of surface area5
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4.3.4 - effect of temperature5
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4.3.5 - effect of catalysts7
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4.4.1 - relative formula mass5
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4.4.2 - moles4
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4.4.3 - mole ratios in formulae12
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4.4.4 - mole ratios in equations7
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4.5.1 - crude oil18
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4.5.2 - alkanes24
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4.5.3 - cracking4
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4.5.4 - alkenes19
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5.2.3 - gas tests7
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5.2.4 - cation tests14
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5.2.5 - anion tests7
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4.6.5 - chromotography5
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5.1.1 - gas volumes6
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5.1.2 - concentration calculations3
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5.1.3 - titration10
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5.2.1 - enthalpy changes8
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5.2.2 - bond breaking and making9
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5.2.3 - calorimity9
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5.3.1 - alcohols23
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5.3.2 - carboxylic acids13
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5.3.3 - esters8
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5.3.4 - polyesters5
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5.4.1 - electrolysis of molten compounds15
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5.4.2 - electrolysis of aqueous compounds7
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dynamic equilibrium19
