Relative atomic mass - Study guides, Class notes & Summaries

AQA AS level Chemistry exam 2024 questions with 100% correct answers Nucleons - ANSWERS Protons and neutrons Electrons (location) - ANSWERS Surrounding the nucleus Relative mass of an electron - ANSWERS 1/1840 Strong nuclear force - ANSWERS The way protons and neutrons are held together in the nucleus Electrostatic forces - ANSWERS The attraction between protons and electrons that hold them together in the atom Atomic Number (Z) - ANSWERS The number of protons in the nucleus Mass nu...

Test Bank for Chemistry and Chemical Reactivity 10th Edition Kotz Full Chapters Complete Guide. Chapter 02 Copyright Cengage Learning. Powered by Cognero. Page 1 1. Which of the following statements concerning atomic structure is/are correct? 1. Neutrons and electrons are found in space as a cloud around the nucleus. 2. The nucleus contains all the positive charge of an atom. 3. Electrons surround the nucleus and account for the majority of an atom's volume. a. 1 only b. 2 only c. 3 onl...

Atom structure Protons and neutrons in the nucleus Electrons arranged around the nucleus in shells Overall charge is zero - atom is neutral Proton relative charge 1+ positive Neutron relative charge 0 Electron relative charge 1- negative Proton relative mass 1 Neutron relative mass 1 Electron relative mass 1/1836 What do atoms of the same element contain? same number of protons Atomic number number of protons How does the periodic table arrange elements? By...

Test Bank for Chemistry and Chemical Reactivity 10th Edition Kotz Full Chapters Complete Guide. Chapter 02 Copyright Cengage Learning. Powered by Cognero. Page 1 1. Which of the following statements concerning atomic structure is/are correct? 1. Neutrons and electrons are found in space as a cloud around the nucleus. 2. The nucleus contains all the positive charge of an atom. 3. Electrons surround the nucleus and account for the majority of an atom's volume. a. 1 only b. 2 only c. 3 only...

What is the difference between a compound and a molecule? - Answer-Chemical bond = molecule crystalline structure or atom by itself -- not a molecule 1 A molecule consists of two more atoms, which can be the same or different types of atom, that are linked by a chemical bond. A molecule of H2 or O2 is still a molecule, but not a compound. 2. A compound is usually a molecule as well. To be a compound, it has to have two different types of atoms, such as H2O. 3. Some compounds like NaCl are ...

Chem Module 2 Exam Questions With 100% Correct Answers what are the 3 subatomic particles of an atom protons neutron electron which 2 subatomic particles have the same mass protons and neutrons what is found at the centre of an atom nucleus what is the overall charge of the nucleus positive what is found within the nucleus protons and neutrons what is the mass of a proton 1 what is the mass of a neutron 1 what is the mass of an electron 1/1836 what is the charge of a proton ...

relative atomic mass (Ar) - Ans weighted mean of all the naturally occurring isotopes of the element (g/mol) relative molar mass (Mr) - Ans sum of Ar (no units) mole - Ans 6.02x10^-23 Empirical Formula - Ans shows the simplest whole number ratio of atoms of each element in a particular substance Molecular Formula - Ans shows the actual number of atoms of each element in a particular molecule or substance

State the electron rules : Lowest energy filled first (3d>4s) Line up parallel Single until forced to pair Electronegativity : The ability of an atom to attract electrons within a covalent bond RAM (relative atomic mass) : Average mass of one atom compared to 1/12th the mass of a c-12 atom - Ionisation energy : The energy required to remove one mole of electrons from each of one mole of gaseous atoms to form one mole of positive gaseous ions 2 (Endothermic) Trends of Ionisat...

Atom definition The smallest component of an element Compound Two or more elements, chemically joined in fixed proportions. They can only be separated by chemical means. Mixture Two or more elements/compounds which are not chemically combined. Ways to separate mixtures - Filtration - Evaporation - Crystallisation - Simple distillation - Fractional distillation - Paper chromatography The plum and pudding model Before electrons were discovered, people thought that atoms were indivi...

AQA AS Physical Chemistry 2024 exam questions with 100% correct answers Who described atoms as solid spheres that make up different elements and when? - ANSWERS 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? - ANSWERS John Dalton in 1803 Who discovered the electron and when? - ANSWERS JJ Thomson, 1897 discovered electrons proving atoms weren't indivisible or solid. New m...