aqa gcse Chemistry Paper 1 (triple) Questions & Answers A+ 2024/2025

aqa gcse Chemistry Paper 1 (triple) Questions & Answers A+ 2024/2025Questions & Answers A+ 2024/2025 What is the radius of an atom? - ANSWER-0.1 nanometers Where is the nucleus located? - ANSWER-center of the atom What does the nucleus contain? - ANSWER-protons and neutrons What charge does a proton have? - ANSWER-positive What charge does an electron have? - ANSWER-negative What is the mass of an electron? - ANSWER-0 what charge does an atom have? - ANSWER-no charge What does the atomic number tell you? - ANSWER-number of protons What does the mass number tell you? - ANSWER-Number of protons and neutrons What is an element? - ANSWER-a Substance that contains only ONE type of atom. What are isotopes? - ANSWER-atoms with the same number of protons but different number of neutrons How is a compound formed? - ANSWER-when two or more elements combine chemically what does a compound that is formed from a metal and non-metal consist of? - ANSWER-ions what do metal atoms lose to form positive ions? - ANSWER-electrons what do non-metals gain to form negative ions? - ANSWER-electrons what does a compound formed from non-metals consist of? - ANSWER-molecules what's the relative charge of a proton? - ANSWER-+1 what's the relative charge of a neutron? - ANSWER-+0 what's the relative charge of a electron? - ANSWER--1 examples of alkaline - ANSWER-potassium hydroxide, sodium hydroxide, calcium hydroxide and magnesium hydroxide examples of acids - ANSWER-sulfur acid, hydraulic acid OH= - ANSWER-alkaline H= - ANSWER-acid end point - ANSWER-the point in a titration at which an indicator changes color Titration - ANSWER-A process of controlled acid-base neutralization, carried out in burets. what happens to a strong acid in an aqueous solution? - ANSWER-it completely dissociates what happens to a weak acid in an aqueous solution? - ANSWER-it partially ionizes examples of weak acids - ANSWER-ethanoic, citric, carbonic what is the nucleus surrounded by? - ANSWER-electrons what is a balanced equation? - ANSWER-an equation in which each side of the equation has the same number of atoms of each element and mass is conserved what are never created or destroyed during a chemical reaction? - ANSWER-atoms the total mass of reactants = - ANSWER-total mass of products how can mixtures be separated? - ANSWER-by physical means, such as filtration, crystallization and simple distillation who created the key ideas successively about atoms? - ANSWER-Dalton Thomson, Rutherford and Bohr what experiment did Rutherford do? - ANSWER-gold foil Continues...