Past Paper Wrong Answers Flashcards
What forms a basic oxide with the formula X2O
Lithium
What is a main componemnt of fertilizers used to improve crop growth
Nitrogen
What is a gas that has a high rate of diffusion at room temperature
Neon
What is the ion responsible for alkalinity in a solution
Hydroxide
What is an experimental technique used when salts are made by reacting dilute acid with an aqueous alkali
Titration
What is a way to describe an alkali
A base that can dissolve in water
What is the raw material from which nitrogen is obtained
Air
What is a saturated solution
A solution that can contain no more solute at a given temperature
What forms when a metal and oxygen react
Metal oxide
What is the volume of one mol of gas at room temp and pressure
24 dm3
DECIMETRES
What are the lines of graduated/measuring cylinders called
Graduation lines
What is the difference between miscible and immiscible
Miscible liquids mix together completely to form a homogenous mixture, immiscible forms a heterogeneous mixture
What is the formula for matter
Matter=Mass/volume (density formula)
What is the difference between a molecule and a compound
2 atoms bonded together=molecule
2 different atoms bonded=compound
2NO + O^2 -> 2NO^2
How does this equation show that NO is oxidised?
Oxygen is added
Cr2O3 + 2Al -> Al2O3+ 2Cr
How does this equation show that chromium(III) oxide is reduced?
It has lost an oxygen
Describe how you could prepare a pure sample of crystals of hydrated cobalt(II) sulfate using dilute
sulfuric acid and an excess of cobalt(II) carbonate
heat cobalt carbonate with dilute sulfuric acid
filtering off the excess cobalt carbonate
Heat the filtrate to point of crystallisation
dry the crystals between filter paper
Describe how you could prepare a pure sample of crystals of hydrated zinc sulfate using dilute
sulfuric acid and an excess of zinc
Heat zinc with sulfuric acid
Filter off excess zinc
Heat to point of crystallization
Dry between filter paper
Diffusion
the random movement of particles from a region of their high concentration to a region of their low concentration down the concentration gradient
non-metal cation that produces ammonia when warmed with sodium hydroxide solution
Ammonium
Process used to manufacture sulfuric acid
Contact process
What do alkenes do to bromine water
Decolourise it
DOES NOT MAKE IT CLEAR
Markovnikov’s rule
The major product is where the hydrogen is added to the carbon with the most hydrogens already attached
Solubility of alkanes
Insoluble in water
Soluble in non polar solvents
Reducing agent in blast furnaces
Carbon monoxide
Main impurity in iron ore
Silicon (IV) oxide
Change in melting in boiling point of an impure substance compared to the pure substance
Melting point decreases
Boiling point increases
