Pass Papers Flashcards
Diamond has a …. melting point
High
A nano diamond contains a few …. atoms
Hundred
Why can diamond be used for drill bits?
As they are hard
What type of Atom in diamond made from?
Carbon
Each atom in a Diamond is bonded to …. other atoms
Four
What structure does a diamond have
A covalent
In diamond ___ of the atoms are bonded together
All
Nitinol is a Shape memory___
Alloy
Why are mixture of metals harder than pure metal?
Because they have bigger atoms
They have no layors to slide
What two factors do you have to consider when choosing the metal for braces?
Cost
Resistant to corrosion
Word equation for Sulfer dioxide with oxygen
Sulphur Dioxide+Oxygen–> Sulfer Trioxide
Sulfer dioxide is a
Compound
When the pressure of the gas is increased the frequency of the collisions
Increases
The minimum amount of energy that particles need to react is called the
Activation energy
What’s one way if increasing the rate of reaction other than changing pressure
Using a catalyst
Atoms with different numbers of nuetrons are called
Isotopes
Compared with proton, the mass of an electron is
Very small
What’s the acid are used to make ammonium nitrate
Nitric acid
How is solid ammonium nitrate obtained from the solution
Evaporation
I found the ammonium nitrate fertiliser on to a field of grass suggest what could happen to the grass
The grass will grow faster
Why does solid magnesium chloride not conduct electricity
As the ions can’t move
Why does magnesium irons move to the negative electrode
As it is positive which attracts
What does this symbol mean —–>
Reversible reaction
In an endothermic reaction the temperature of the surroundings
Decreases
In a paper chromatography reaction to start and I should be drawn with a ruler and pencil give a reason for your answer
So it won’t dissolve
Give three conclusion she can make from the students results in a paper chromatography
Two colours and fruit drink
Three colours in Coke
Some colours in the drink Are different
Why do you different compounds separate in a gas chromatography column
As different substances travel at different speeds
Large amount of caffeine can be harmful only one of the questions on the table can be answered by science alone what’s the answer
Is there some caffeine in a certain brand of drink
Give two reasons one of the questions cannot be answered by science alone
Cannot be done by experiment
Economic issues
Relative mass of a proton
1
What’s relative mass of the neutron
One
What’s relative mass of electron
Very small
What is the total number of protons and neutrons in an atom called
The mass number
Carbon reacts with oxygen to produce carbon dioxide
how many different elements are there I’m on molecule CO2
2
What is the total number of atoms in the molecule carbon dioxide
3
I need your method is used to measure the amount of carbon dioxide in the air give one reason for using an instrumental method
Accurate
What is the property of substance that have simple molecule
Have no overall electrical charge
Which one of the following questions cannot be answered by science alone
Should Iodine be added to salt in food
Give one reason why this question cannot be answered by science alone
Can’t be done by experiment
A student producer so am I near nitrate by adding an acid to ammonia solution name the acid used
Nitric acid
Ammonia solution (ammonium hydroxide) is
An alkali
Student I did a few drops of solution which change colour when the reaction was complete.
The solution added is an
Indicator
How is solid ammonia nitrate made from a solution of ammonia nitrite
Crystallisation
Why do you pharmacies ammonium nitrate on their fields
To help crops grow
State one reaction condition that can be changed when making polyethene
Pressure
What type of substance is lead iodide
Compound
What’s the word equation for precipitation reaction
Lead nitrate+Potassium Iodide= lead iodide+ Potassium nitrate
Explain why the apparatus in figure 3 would not separate the lead iodide from the mixture
Paper is missing is a solid will go through
The student expected to get 5 g but only got 3 g give one reason why the mass the student got was less than expected
As some product may have got lost
Just one reason why spoons are electroplated
Improve lifespan
What is made from chlorine
Bleach
Why is hydrogen produced at the negative electrode and not sodium
As hydrogen is less reactive than sodium
What is the type of bond in a molecule of hydrogen chloride
Covalent
Why is hydrogen chloride a gas at room temperature
Hydrogen chloride has a low boiling point
Hydrogen chloride is made of simple molecules
Name a gas produced at the positive electrode
Oxygen
At the negative electrode Aluminium ions gain electrons to produce aluminium what is this type of reaction called?
Reduction
Metals can be bent and shaped because the layers of atoms can
Slide
Graphite has
Strong covalent bonds
State one conclusion the student could make about the effect of the temperature on the rate of reaction
High temperature faster reaction
A student investigated how the surface area of marble chips affected the rate of reaction
State 2 variables
Concentration of acid
Mass of marble chips
Give one reason why are using a catalyst reduces cost
Catalyst is not used up
Explain in terms of structure, why some polymers are thermosettinf
Because they cannot slide and they have cross links
What does gas chromatography do to the substance
Separates
Give two reasons for using instrumental methods for analysis
Quick and accurate
Ionic compounds are made of
Giant lattices
Solid potassium chloride does not conduct electricity because the ions
Cannot move
What could students do to the potassium chloride to make it conduct electricity
Melt it
When the potassium irons reach the negative electrode they turn into potassium
Atom
Name the type of bond between the carbon and hydrogen atoms in methane
Covalent
Explain why methane is a gas at 20*C
Low boiling point has a small molecule
Why are alloys harder than iron
Particles cannot be layered therefore cannot slide
How could the solid lead iodide be separated from the solution
Filtering
Name the acid used to produce ammonium nitrate
Nitric
The reaction of Ammonia with an acid is a
Neutralisation reaction
Sodium chloride are held together by strong
Electrostatic forces
