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OCR A Level Chemistry Paper 1
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OCR A Level Chemistry Paper 1
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OCR A Level Chemistry Paper 1What is the formula and charge for hydrogen carbonate? - question and answerHCO₃⁻
What is the formula and charge for phosphate? - question and answerPO₄³⁻
What is the formula and charge for silicate? - question and answerSiO₃²⁻
How do you calculate the relative atomic mass of an isotope? - question and
answer(isotope mass x percentage) + (isotope mass x percentage) ÷ 100
What is the ideal gas equation? - question and answerpV=nRT
What are the units for the ideal gas equation? - question and answerPressure in Pa,
volume in m3, temperature in K
What is the equation linking moles, volume and 24dm³? - question and answerMoles =
volume 24dm³/24000cm³
How do you calculate molality and what is molality measured in? - question and
answermolality = molarity x molar mass
molality is measured in gdm⁻³
What is the equation for percentage yield? - question and answerpercentage yield =
(actual yield/theoretical yield) x 100
What is the equation for atom economy? - question and answer% atom economy =
(mass of desired products/total mass of reactants) x 100
What is the difference between strong and weak acids? - question and answerStrong
acids fully dissociate in water to produce the maximum number of H+ ions whereas
weak acids do not fully dissociate
What shape is an s orbital? - question and answerspherical
What shape is a p orbital? - question and answerdumb bell
, How many electrons can one orbital hold? - question and answer2
Definition of an orbital - question and answera region of space that can hold up to two
electrons of opposite spin
What is the formula for nitrate? - question and answerNO₃⁻
What is the formula for sulfate? - question and answerSO₄⁻
What is the formula for hydroxide? - question and answerOH⁻
What is the formula for carbonate? - question and answerCO₃²⁻
What is the formula for ammonium? - question and answerNH₄⁺
What is a dative covalent bond/coordinate bond? - question and answera shared pair of
electrons where both electrons are donated by one atom
What shape and bond angle would a molecule with 2 bonding pairs have? - question
and answerlinear, 180°
What shape and bond angle would a molecule with 3 bonding pairs have? - question
and answertriganol planar, 120°
What shape and bond angle would a molecule with 4 bonding pairs have? - question
and answerTetrahedral, 109.5°
What shape and bond angle would a molecule with 6 bonding pairs have? - question
and answerOctahedral, 90°
How does having a lone pair affect bond angle? - question and answerLone pairs repel
more than bonding pairs so for every lone pair take away 2.5° from the bond angle
What shape and bond angle would NH3 have? - question and answer3 bonding pairs
and 1 lone pair so bond angle of 107 (109.5-2.5) and a pyrimidal shape
What shape and bond angle does H2O have? - question and answer2 bonding pairs
and 2 lone pairs so bond angle of 104.5 and a non-linear/angular/bent shape
Definition of electronegativity: - question and answerthe ability of an atom to attract the
pair of electrons in a covalent bond to itself
What are the conditions for a molecule to be considered polar? - question and
answermust have polar bonds, must be assymetric
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