2592759
Descripción
Test por Gabi Germain, actualizado hace más de 1 año
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Creado por Gabi Germain
hace alrededor de 9 años
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Pregunta 1
Pregunta
How did mandeleev overcome the problem of undiscovered elements?
Respuesta
-
Put them in a seperate groups
-
Leaving spaces
-
Ignoring them
Pregunta 2
Pregunta
How were the early periodic tables arranged?
Respuesta
-
By proton number
-
By Atomic weight
Pregunta 3
Pregunta
How is the modern periodic table ordered?
Respuesta
-
Atomic weight
-
Proton number
Pregunta 4
Pregunta
Elements in the same group have the same number of...
Respuesta
-
Electrons in their outer shell
-
shells or energy levels
-
Protons in the nucleus
Pregunta 5
Pregunta
Characteristics of group 1:
Respuesta
-
Low density
-
High density
-
React with non metals to form ionic compounds and carry a +1 charge
-
React with non metals to form covalent compounds and carry a +1 charge
-
React with water to release hydrogen
-
form hydroxides that dissolves in water to give alkaline solutions
Pregunta 6
Pregunta
The further up the group 1 the more reactive and lower its melting poit
Respuesta
- True
- False
Pregunta 7
Pregunta
Characteristics of transition elements compared with group1:
Respuesta
-
higher melting points
-
lower melting points
-
stronger and harder
-
Much less reactive
-
Much more reactive
Pregunta 8
Pregunta
Transition metals are useful catalysts
Respuesta
- True
- False
Pregunta 9
Pregunta
What are group 7 elements known as?
Respuesta
-
Alkalis
-
Acids
-
Gases
-
Halogens
Pregunta 10
Pregunta
The further down group 7 the less reactive and the higher melting point.
Respuesta
- True
- False
Pregunta 11
Pregunta
A more reactive halogen can displace a less reactive halogen from an..
Respuesta
-
Aqueous solution of its salt
-
Aqueous solution of its oxide
Pregunta 12
Pregunta
The more energy levels an element has the less reactive it is
Respuesta
- True
- False
Pregunta 13
Pregunta
Hard water can contain..
Respuesta
-
Magnesium ions
-
Calcium ions
-
Hydrogencarbonate ions (in temporary)
-
barium
-
Berillium
Pregunta 14
Pregunta
Which type of water form a lather readily?
Respuesta
-
Soft water
-
Hard water
Pregunta 15
Pregunta
There are two types of hard water temporary hard water and permanent hard water
Respuesta
- True
- False
Pregunta 16
Pregunta
Scum is formed by the decomposition of Hydrogencarbonate ions in temporary hard water
Respuesta
- True
- False
Pregunta 17
Pregunta
What are two ways that hardness can be removed?
Respuesta
-
Exchange columns and adding sodium carbonate
-
Heating it and adding calcium carbonate
Pregunta 18
Pregunta
What are two things that water should have low levels of?
Respuesta
-
Water
-
Calcium
-
Microbes
-
Dissolved salts
Pregunta 19
Pregunta
Pure water can be produced by distillation
Respuesta
- True
- False
Pregunta 20
Pregunta
What do water filters contain to remove some dissolved substances from water?
Respuesta
-
Silver, carbon and ion exchange resin
-
Gold, carbon and ion exchange resin
Pregunta 21
Pregunta
Chlorine is added to water to increase microbes and flourine isn't added to improve dental health
Respuesta
- True
- False
Pregunta 22
Pregunta
How is energy released from substances measured?
Respuesta
-
Calorimetry
-
Titration
-
Electrolysis
Pregunta 23
Pregunta
Why in a chemical reaction should the reagents be mixed in an insulated container?
Respuesta
-
So less energy escapes to the surroundings
-
So it wont burn the person
-
so none of the substance leaks out
Pregunta 24
Pregunta
During a reaction energy is needed to make bonds and energy is released when breaking bonds
Respuesta
- True
- False
Pregunta 25
Pregunta
Three things to do when drawing an energy diagram:
Respuesta
-
Show reactants then products
-
Show activation energy
-
Overall energy change
-
Use a red pencil
-
Draw a best fit line
-
Show products then reactants
Pregunta 26
Pregunta
In an exothermic reaction more energy is released to make bonds than break them
Respuesta
- True
- False
Pregunta 27
Pregunta
Catalysts higher the activation energy
Respuesta
- True
- False
Pregunta 28
Pregunta
Tick the 4 true facts:
Respuesta
-
Lithium has a crimson flame
-
Lithium has a lilac flame
-
Potassium has a lilac flame
-
Barium has a blue flame
-
Barium has a green flame
-
sodium has a yellow flame
-
sodium has an orange flame
Pregunta 29
Pregunta
Aluminium, calcium and magnesium ions form white precipitates
Respuesta
- True
- False
Pregunta 30
Pregunta
What colour precipitate does copper form?
Respuesta
-
Blue
-
Green
-
Brown
Pregunta 31
Pregunta
What colour precipitate does iron (lll) ions form?
Respuesta
-
Green
-
Brown
-
Blue
Pregunta 32
Pregunta
What colour precipitate does iron(ll) ions give?
Respuesta
-
Green
-
Blue
-
Brown
Pregunta 33
Pregunta
Carbonates react with dilute acid to form carbon dioxide
Respuesta
- True
- False
Pregunta 34
Pregunta
Halide ions can be tested by adding what and what then looking at the precipitates?
Respuesta
-
Silver nitrate solution and dilute nitric acid
-
Silver nitrate solution and hydrochloric acid
-
silver nitrate solution and barium oxide
Pregunta 35
Pregunta
To test sulphate ions add hydrochloric acid and barium chloride solution
Respuesta
- True
- False
Pregunta 36
Pregunta
How can volumes of acid and alkali solutions that react with each other be measured?
Respuesta
-
Titration
-
Calorimetry
-
Electrolysis scales
Pregunta 37
Pregunta
What are the raw materials in the haber process?
Respuesta
-
Nitrogen
-
Hydrogen
-
Iron
-
Ammonia
Pregunta 38
Pregunta
What is the temperature and pressure in the haber process?
Respuesta
-
200 atmospheres and 450 degrees
-
450 atmospheres and 200 degrees
Pregunta 39
Pregunta
Ammonia is produced in the haber process
Respuesta
- True
- False
Pregunta 40
Pregunta
Equilibrium is reached when the reactions occur at the same rate in each direction
Respuesta
- True
- False
Pregunta 41
Pregunta
To increase the yield in a reaction that is exothermic in the forward direction what do you do?
Respuesta
-
Increase the temperature
-
Decrease the temperature
Pregunta 42
Pregunta
What can you do to increase the yield when the forward reaction has more gaseous molecules?
Respuesta
-
Increase the temperature
-
Decrease the temperature
Pregunta 43
Pregunta
We have to compromise temperature, pressure and rate of reaction in the haber process
Respuesta
- True
- False
Pregunta 44
Pregunta
Which functional group is for alcohols?
Respuesta
-
-OH
-
-COO-
-
-COOH
Pregunta 45
Pregunta
Which functional group is for esters?
Respuesta
-
-COO-
-
-OH
-
-COOH
Pregunta 46
Pregunta
What is the functional group for acids?
Respuesta
-
-COOH
-
-COO-
-
-OH
Pregunta 47
Pregunta
3 characteristics of alcohols:
Respuesta
-
burn in air
-
don't burn in air
-
React with sodium to produce hydrogen
-
React with sodium to produce carbon dioxide
-
dissolve in water to form a neutral solution
Pregunta 48
Pregunta
Oxidising ethanol makes ethanoic acid
Respuesta
- True
- False
Pregunta 49
Pregunta
4 characteristics of carboxylic acids:
Respuesta
-
dissolve in water to produce acidic solutions
-
dissolve in water to produce alkali solutions
-
dont ionise completely when dissolved in water so are weak acids
-
ionise completely with water
-
react with alcohols in the presence of an acid to produce esters
-
react with carbonates to produce carbon dioxide
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