Equation for moles - Study guides, Class notes & Summaries

past papers questions chemistry - November 2020 AS paper 1, 2017 paper 2 A level, paper 1 2019 A level Questions and Answers 100% Pass | Updated 2024 This question is about atomic structure.There is a general trend for an increase in ionisation energy across Period 3. Give one example of an element that deviates from this trend. Explain why this deviation occurs. - Correct Answer ️️ -Aluminium / Al(Outer) electron in (3)p orbital / sub-shell (level) (3p) higher in energy / slightly ...

AS-level AQA Chemistry questions and answers What is the charge of a proton? - ANSWERS +1 What is the charge of a neutron? - ANSWERS 0 What is the charge of an electron? - ANSWERS -1 What is the mass of a proton? - ANSWERS 1 What is the mass of a neutron? - ANSWERS 1 What is the mass of an electron? - ANSWERS 1/1800 What is an isotope? - ANSWERS Isotopes of an element are atoms with the same number of protons but different numbers of neutrons. Why do isotopes of an element all have t...

Acetate - ️️CH3COOacid-base reaction - ️️When an acid and base mix together, neutralize one another's properties, and form a salt. Ammonium - ️️NH4+ angular momentum quantum number - ️️symbolized by l, indicates the shape of the orbital Anion - ️️high first ionization energy, very negative EA Anion Trend - ️️are larger than the atom from which they were formed antibonding MO - ️️ex) 1s - 1s = sigma 1s** has higher energy atomic size trend - ️️increases...

P=F/A - Answer-pressure equals force divided by area Boyle's Law - Answer-they volume of a fixed quantity of gas at constant temperature is INVERSELY proportional to the pressure Boyle's Law equation - Answer-PV=K Charles's Law - Answer-The volume of a fixed amount of gas at a constant pressure is directly proportional to its absolute temperature Charles's Law Equation - Answer-V/T=K Avogadro's Law - Answer-The volume of a gas at constant temperature and pressure is directly proport...

MLS 121 Laboratory Midterm Exam Questions & answers | Best For 2024 Exam 5/20/22, 11:47 AM MLS 121 Laboratory Midterm Exam Student Identification 0 of 0 points Kindly complete the data below. MLS 121 Laboratory Midterm Exam Total points 66/100 Good Day! The MIDTERM examination is a 100-POINT ONLINE EXAM that will utilize a Google Form. It is composed of Multiple Choice questions that is answerable within TWO HOURS ONLY. The examination shall cover Activities 3 and 4. The exam questionnai...

Stoichiometry is the branch of chemistry that deals with elements in compounds and with reactants and products in chemical reactions focusing on - Mass relationships Reaction stoichiometry is based on chemical equations and - The law of conservation of mass The number of significant figures in an answer to a stoichiometry problem is determined only by - The number of significant figures of any measured quantities in the problem The chemical equation P₄O₁₀ + 6H₂O 4H₃PO₄ can be in...

AS-level AQA Chemistry questions and answers What is the charge of a proton? - ANSWERS +1 What is the charge of a neutron? - ANSWERS 0 What is the charge of an electron? - ANSWERS -1 What is the mass of a proton? - ANSWERS 1 What is the mass of a neutron? - ANSWERS 1 What is the mass of an electron? - ANSWERS 1/1800 What is an isotope? - ANSWERS Isotopes of an element are atoms with the same number of protons but different numbers of neutrons. Why do isotopes of an element all have t...

3 driving forces for a metathesis reaction 1. Precipitation 2. Gas 3. Formation of a weak or non-electrolyte 7 s trong acids - HCl = hydrochloric acid - HBr = hydrobromic acid - HI = hydroiodic acid - H2SO4 = sulfuric acid - HNO3 = nitric acid - HClO3 = chloric acid - HClO4 = perchloric acid Accuracy How close a measurement is to its true value Average X ̅ = (∑Xi )/n Boiling point The temperature at which the vapor pressure of the liquid equals the prevailing atmospheric pressure...

SAMPLE CHEMISTRY PLACEMENT EXAM QUESTIONS WITH COMPLETE SOLUTIONS 100% 2023/2024 Answer: Oxygen Aluminum forms a +3 ion. In order for the formula unit Al₂X₃ to be electrically neutral, the element X must form a -2 ion. Nonmetals in the oxygen column do this. Of these elements, only oxygen is a diatomic gas. Aluminum reacts with element X to form a compound with the formula A₂X₃. Element X exists as diatomic molecules, X₂, in the gaseous state at normal temperature and pressure. Elem...

First Semester Study Guide AP Chem Buck Exam 196 Questions with Verified Answers Salts containing which of the following ions are generally insoluble in cold water? a. nitrate b. acetate c. phosphate d. potassium e. ammonium - CORRECT ANSWER C. Phosphate Which of the following changes alone would cause a decrease in the value of Keq for the reaction represented above? a. Decreasing the volume of the reaction vessel b. Adding a catalyst c. Increasing the volume of the reacti...