Test
Additional Science Chemistry
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Preguntas del test (22)
1Some coins are made from an alloy of aluminium . Aluminium is manufactured by the electrolysis of a molten mixture of cryolite and [blank_start]aluminium oxide[blank_end] .
- Aaluminium oxide
2Explain why iodine has a low melting point (3 marks)
Iodine has a [blank_start]simple molecular structure[blank_end] with [blank_start]intermolecular forces[blank_end] which are [blank_start]weak[blank_end] or which require
[blank_start]little energy to overcome[blank_end]- Aintermolecular forces
- Bsimple molecular structure
- Cweak
- Dlittle energy to overcome
3Anode is a positive electrode in electrolysis ?
- AVerdadero
- BFalso
4What do you call the negative electrode in electrolysis?
[blank_start]Cathode[blank_end]- ACathode
5during electrolysis, positive ions move to the [blank_start]negative[blank_end] electrode and negative ions move to the [blank_start]positive[blank_end] electrode
- Apositive
- Bnegative
6in electrolysis, [blank_start]PbBr2[blank_end](l) -->[blank_start]Pb[blank_end](l) + [blank_start]Br2[blank_end]([blank_start]g[blank_end])
- Ag
- Bgas
- CPbBr2
- DPbBr
- EPb
- FPbr2
- GBr
- HBr2
7the electrolyte either needs to be a [blank_start]solution[blank_end] or [blank_start]molten[blank_end]
- Asolution
- Bliquid
- CMolten
- DGas
8[blank_start]Covalent[blank_end] compounds cannot be split by electrolysis
- ACovalent
- BMetalic
- CIonic
9The Universal Indicator turned blue. What is the Ph value of the solution?
[blank_start]9[blank_end]- A2
- B9
- C7
10In electrolysis, how do we represent what is happening?
[blank_start]Half equations[blank_end]- AHalf equations
11when reduction and oxidation happen at the same time it is called a [blank_start]redox reaction[blank_end]
- Aredox reaction
12when we electrolyse brine we get C[blank_start]hlorine[blank_end] g[blank_start]as[blank_end] at the [blank_start]anode[blank_end], hydrogen at the [blank_start]cathode[blank_end] and a solution of sodium [blank_start]hydroxide[blank_end] is also formed
- Aas
- Bhlorine
- Canode
- Dcathode
- Ehydroxide
13[blank_start]sodium hydroxide[blank_end] is used to control the pH in many industrial processes
- Asodium hydroxide
14Diamond and silicon both have a giant [blank_start]covalent[blank_end] structure
- Acovalent
15What do you call the minimum amount of energy two particles need to react with each other? [blank_start]Activation energy[blank_end]
- AActivation energy
16The four things needed for a quick reaction are, t[blank_start]emperature[blank_end], c[blank_start]oncentration[blank_end] or p[blank_start]ressure[blank_end], s[blank_start]urface area[blank_end] and c[blank_start]atalyst[blank_end]
- Aemperature
- Boncentration
- Cressure
- Durface area
- Eatalyst
17Name some properties of Graphite
Carbon forms [blank_start]three[blank_end] covalent bonds leaving one electron free. Layers of carbon atoms are free to [blank_start]slide[blank_end] over each other (used as a lubricant) because of [blank_start]weak[blank_end] intermolecular forces. [blank_start]Free electrons[blank_end] means graphite is a non-metal that can conduct electrical current (and heat).- AFree electrons
- Bthree
- Cweak
- Dslide
18How do you calculate the number of moles in an equation?
[blank_start]Mass[blank_end] in grams [blank_start]divided[blank_end] by the [blank_start]relative mass[blank_end] of element or compound- AMass
- Brelative mass
- Cdivided
- Dmultiplied
- Erelative mass
- Fmass
19What is electroplating?
Using [blank_start]electrolysis[blank_end] to coat surface of a [blank_start]metal[blank_end] with another metal e.g. gold plated. Involves using object as the negative electrode.- Aelectrolysis
- Bmetal
20What is used to reduce the melting point of aluminum oxide?
[blank_start]Cryolite[blank_end]- ACryolite
- BCarbon
21Oxidation Is loss of electrons (at positive electrode)
- AVerdadero
- BFalso
22ReductionIs gain of electrons (at negative electrode)
- AVerdadero
- BFalso
Información
- Descripción
- AQA
- Autor
- Jacqueline Adjei
- Idioma
- English
- Visitas
- 3
- Etiquetas
- Valoración
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