Test
AQA GCSE Chemistry Unit 2.2
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Preguntas del test (20)
1True or false? Ionic compounds have high melting points because the forces of electrostatic attraction holding them together are strong.
- AVerdadero
- BFalso
2When will ionic compounds conduct electricity?
- ASolid
- BLiquid
- CIn solution with water
- DGas
3True or false? Solid ionic compounds conduct electricity because the ions are locked tight together and can pass on charge.
- AVerdadero
- BFalso
4What state would you expect to find simple covalent molecules such as methane in at room temperature?
- ASolid
- BLiquid
- CGas
5Why do simple covalent molecules have low melting and boiling points?
- AThey are smaller so easier to break by heat energy
- BThe intermolecular forces are weak and broken during heating
- CThey don't have any metal atoms which are heavy and need a lot of heat energy to liquefy
6True or false? Simple covalent molecules conduct electricity when liquid.
- AVerdadero
- BFalso
7Which of these are allotropes of carbon?
- ADiamond
- BSilica
- CLime
- DGraphite
8Which of these describe the bonding in diamond?
- AEach carbon bonds to four others
- BEach carbon bonds to three others
- CMultidirectional
- DLayered
- ERigid
- FSoft
9Which of these describe the bonding in graphite?
- AEach carbon bonds to four others
- BEach carbon bonds to three others
- CMultidirectional
- DLayered
- ERigid
- FSoft
10What is a fullerene?
- AA chemical which is used to clean wool in industry
- BAn allotrope of carbon formed of hexagonal rings
- CA protein released by the brain to control how much humans eat
11True or false? We create alloys to reduce the malleability of metals by breaking up the layered structure of the metal.
- AVerdadero
- BFalso
12True or false? The sea of delocalised electrons in metals prevents them from conducting electricity.
- AVerdadero
- BFalso
13What is a shape memory alloy?
- AAn alloy which is not malleable
- BAn alloy which returns to its original shape upon heating
- CAn alloy which is used to improve visual memory
14What do the properties of a polymer depend on?
- AReaction conditions
- BMonomer
- CNothing - it is random
- DThe age of the polymer
15Which type of poly(ethene) is stronger?
- ALow density (LD) poly(ethene)
- BHigh density (HD) poly(ethene)
16Which type of polymer has intermolecular forces broken down on heating?
- AThermosoftening
- BThermosetting
17Which type of polymer has covalent crosslinks that are not broken down on heating?
- AThermosoftening
- BThermosetting
18How big is 1 nanometre?
- A10^-3 metres
- B10^-6 metres
- C10^-9 metres
19True or false? Modern sunscreens use titanium oxide nanoparticles because they are more effective than conventional UV ray blockers.
- AVerdadero
- BFalso
20True or false? Nanoparticles are ineffective catalysts due to their small size.
- AVerdadero
- BFalso
Información
- Descripción
- Twenty questions for the second section of Unit 2 in AQA GCSE Chemistry: Structure and properties.
- Autor
- Matthew T
- Idioma
- English
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- 924
- Etiquetas
- Valoración
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