Ion colour - Study guides, Revision notes & Summaries

2 © OCR 2023 Section A You should spend a maximum of 30 minutes on this section. Write your answer to each question in the box provided. 1 Where is most of the mass found in an atom? A Electrons B Neutrons C Nucleus D Protons Your answer [1] 2 Sodium fluoride has the formula NaF. The formula of the sodium ion is Na+ . What is the formula of the fluoride ion? A F + B F – C F 2+ D F 2– Your answer [1] 3 Which row of results shows that the pH of a solution is acidic? pH...

PAPER 1 CHEMISTRY QUESTIONS AND CORRECT ANSWERS (graded A+} they are all soluble - correct answer-What is true about common sodium, potassium and ammonium salts? hydrogen ions - correct answer-What are acids in solution a source of? hydroxide - correct answer-What are alkalis in solution a source of? 7 - correct answer-What is the pH of a neutral solution? low (less than 7) - correct answer-Do acidic solutions have high or low pH values? high (greater than 7) - correct answer-Do alka...

DHF II Midterm Exam Questions With Accurate Answers. What is the most common disease in humans? - answerdental caries What is the oldest theories of caries? - answerTooth worms What causes caries on pits and fissures? - answerIncomplete fusion, hypoplasia of enamel What causes smooth surface caries? - answerIntact smooth surface, facial lingual or interproximal of adjoining of teeth Where is root surface caries initiated? - answerDentin What causes secondary or recurrent caries? - answer...

GCSE COMBINED SCIENCE: SYNERGY F Foundation TierPaper 3 Physical Sciences 2023 AQA GCSE COMBINED SCIENCE: SYNERGY 8465/3F Foundation Tier Paper 3 Physical Sciences Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] Friday 9 June 2023 Afternoon Time allowed: 1 hour 45 minutes Materials For this paper you must have: a ruler a protractor a scientific calculator the periodic table (enclosed) the Physics Equations Sheet (enclosed). Instructions Use black ink or black ball-point ...

Practicals Chemistry AQA A-level Rated A+ Required Practical 1 - titration and making a standard solution Making a standard solution 1. weigh the required mass of solid using a sample bottle on a 2 dp balance. 2. transfer the solid into a beaker using distilled water to wash it out- preventing any solid remaining in the sample bottle. 3. reweigh the sample bottle and work out the difference. 4. Add 100cm3 of distilled water to the beaker to dissolve the solid (small volume of water) using a...

IGCSE Chemistry Written Exam 2024. State the method used to obtain sand from a mixture of sand and water - CORRECT ANSWER filtration State the method used to obtain solid copper sulfate from aqueous copper sulfate - CORRECT ANSWER crystallisation State the method used to obtain red food dye from a mixture of food dyes - CORRECT ANSWER paper chromatography State the method used to obtain water from salt water - CORRECT ANSWER simple distillation Draw a diagram to show equipment u...

Edexcel iGCSE Chemistry, question and answer with rated solution Experiment for Diffusion? 1) HCl placed at one end of the test tube, ammonia solution at the other. 2) Where they meet, a ring of Ammonium Chloride appears. 3) The diagram shows that the ammonia is closer to the ring, showing that ammonia must have travelled faster, showing it's a lighter gas. Experiment for Dilution? 1) Put a coloured substance in a solvent e.g food colouring in water. 2) Over the time, the colour le...

NATS 1870 FINAL EXAM REVIEW through accommodation, your eye can change its refractive power to help it focus images by changing the shape of the lens itself, via attached ciliary muscles contracting or relaxing it (lesson 13) we have blurry vision in water (such as in a swimming pool) because cornea itself is mostly made of water, reducing the difference in indices of refraction (lesson 13) a person born with no (functioning) retina in his eyes would be completely blind (lesson 13) alth...

2023 AQA GCSE COMBINED SCIENCE: SYNERGY 8465/3F Foundation Tier Paper 3 Physical Sciences Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] Friday 9 June 2023 Afternoon Time allowed: 1 hour 45 minutes Materials For this paper you must have: a ruler a protractor a scientific calculator the periodic table (enclosed) the Physics Equations Sheet (enclosed). Instructions Use black ink or black ball-point pen. Pencil should only be used for drawing. Fill in the boxes at the top o...

AQA AS Biology - Biological Molecules Questions and Answers glycogen and cellulose are both carbohydrates describe two differences between the structure of a cellulose molecule and a glycogen molecule (2 marks) - ANSWER 1. cellulose is made up of beta glucose monomers, whereas, glycogen is made up of alpha glucose monomers 2. cellulose has a straight chain and glycogen is branched starch is a carbohydrate often stored in plant cells. describe and explain two features of starch that ma...