Relative masses - Study guides, Class notes & Summaries

2023 AQA GCSE CHEMISTRY 8462/1H Paper 1 Higher Tier Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] GCSE CHEMISTRY Higher Tier Paper 1 H Monday 22 May 2023 Morning Time allowed: 1 hour 45 minutes Materials For this paper you must have: • a ruler • a scientific calculator • the periodic table (enclosed). Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in the boxes at the top of this page. • Answer all...

GCSE COMBINED SCIENCE: TRILOGY 8464/C/1H Chemistry Paper 1H Version: 1.0 Final *JUN238464C1H01* IB/M/Jun23/E5 8464/C/1H For Examiner’s Use Question Mark 1 2 3 4 5 6 7 TOTAL Monday 22 May 2023 Morning Time allowed: 1 hour 15 minutes Materials For this paper you must have: • a ruler • a scientific calculator • the periodic table (enclosed). Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in the boxes at ...

ASTRO 7N MIDTERM 1UNIT 1 - correct answer Gravity - correct answer Newton's First Law - correct answer An object at rest, or in motion in a straight line at a constant speed, will remain in that state unless acted upon by a force Newton's Second Law - correct answer The acceleration of a body due to a force will be in the same direction as the force, with a magnitude directly proportional to its mass Force = mass x acceleration Newton's Third Law - correct answer For every acti...

According to the Lewis definition, an acid is a species that _____________ a pair of electrons - correct answer accepts A system of two nuclei where each atom donates one electron to the other atom is called a ______________ bond - correct answer covalent Reactant molecules are forming products as fast as ____________ are reacting to form reactants - correct answer product molecules Chemical equilibrium is the result of ___________ reactions attaining equal speeds. - correct answ...

environmental pressures correct answers the factors (abiotic or biotic) in an ecosystem which put pressure on an organism's survival and increase competition (whether inter-species or intra-species) biodiversity correct answers a combination of the species diversity, genetic diversity and habitat diversity of an ecosystem variation correct answers the differences, either physical or genetic, between individuals of a species simpson's diversity index correct answers a measure of divers...

AQA AS Physical Chemistry Exam Questions and Answers Who described atoms as solid spheres that make up different elements and when? - Answer- John Dalton in the 19th century Who suggested that atoms of a particular element had the same mass and atoms of different elements had different masses and when? - Answer- John Dalton in 1803 Who discovered the electron and when? - Answer- JJ Thomson, 1897 discovered electrons proving atoms weren't indivisible or solid. New model named plum puddin...

Rutherford's Gold Foil Experiment - proposed that atoms consist of a tiny, massive, positive nucleus surrounded by electrons nucleus - contains all the positive charge and nearly all the mass of the atom James Chadwick - discovered the neutron cathode rays - move from negative electrode to positive electrode (like electrons in a voltaic cell) Thompson's Cathode Ray Experiment - discovery of the electron (also the discovery that atoms are divisible into smaller particles) Millikin's oil...

Isotopes ֎ -:- Atoms of the same elements with different numbers of neutrons and different masses Why do isotopes of the same element have the same chemical properties? ֎ -:- Same number of electrons, number of neutrons has no effect on reactions of an element Relative isotopic mass ֎ -:- Mass of an isotope relative to 1/12th of the mass of an atom of carbon-12 Relative atomic mass ֎ -:- The weighted mean mass of an atom of an element compared with 1/12th of the mass of an atom ...

GCSE AQA Science Chemistry Study Guide Questions 2024. Draw and label an atom - CORRECT ANSWER Protons Neutrons Electrons What are the masses and charges of these parts of an atom? • Proton • Neutron • Electron - CORRECT ANSWER Protons = +ve (mass 1) Neutrons = neutral (mass 1) Electrons = -ve (mass 1/2000th) Why do atoms usually have no overall electrical charge? - CORRECT ANSWER Atoms usually have no overall charge because they have equal numbers of protons ...

What is mass spectrometry? - ️️an accurate instrumental technique used to determine the relative isotopic mass and the relative abundance for each isotope. Relative atomic mass can be calculated from this What is the relative isotopic mass of an isotope? - ️️the mass of the isotope on a scale on which a carbon-12 atom has a mass of exactly 12 units. The mass spectrometer is the most useful instrument for the accurate determination of what? - ️️relative atomic masses (Ar) What is t...