What is crystallisation - Study guides, Class notes & Summaries

Experiment for Diffusion? - correct answer 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? - correct answer 1) Put a coloured substance in a solvent e.g food colouring in water. 2) Over ...

GCSE EDEXCEL TRIPLE SCIENCE CHEMISTRY PAPER 2 2024 QUESTION PAPER WITH QUESTIONS AND CORRCT ANSWERS GRADED A+ What is in the nucleus? - CORRECT ANSWER-Protons and neutrons What is relative atomic mass? - CORRECT ANSWER-Relative atomic mass is an average mass taking into account the different masses and abundances of all the isotopes that make up the element How do you calculate the relative atomic mass? - CORRECT ANSWER-Sum of (isotope abundance x isotope mass number) / sum of abundances of a...

Experiment for Diffusion? - Correct Answer 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? - Correct Answer 1) Put a coloured substance in a solvent e.g food colouring in water. 2) Over the time, the colour levels out but is weaker than the origi...

what is water of crystallisation? - correct answer water molecules that make up part of the crystal structure of a solid define relative isotopic mass - correct answer the ass of an atom of an isotope of an element relative to one twelfth the mass of an atom of C-12 why is relative atomic mass written as a decimal? - correct answer it is a weighted average mass define molecular formula - correct answer the actual number of atoms of each element in a compound define what an orbital is...

4 basic food molecules carbohydrate protein lipid water percentage of water in food 0-95% oil is ____ % water 0% meat is ___ % water 70% free water water that is easily separated from food Bound water water incorporated into chemical nature of other nutrients why is water polar? electrically unsymmetrical positive H negative O 1 kilocalorie amount of energy needed to raise temp of 1kg of water by 1°C what substance takes the m...

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...

1. What are *atoms*? - Ans .The smallest part of an element that can exist 2. What are *compounds*? - Ans .- They are formed from elements by chemical reactions - Contain 2 or more elements chemically combined in fixed proportions - Can only be separated into elements by chemical reactions 3. What do *chemical reactions* involve? - Ans .The formation of one or more new substances, and often involve detectable energy change 4. What is a *mixture*? - Ans .- Consists of two or more elements/...

Experiment for Diffusion? - correct answer 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? - correct answer 1) Put a coloured substance in a solvent e.g f...

what is water of crystallisation? - correct answer water molecules that make up part of the crystal structure of a solid define relative isotopic mass - correct answer the ass of an atom of an isotope of an element relative to one twelfth the mass of an atom of C-12 why is relative atomic mass written as a decimal? - correct answer it is a weighted average mass define molecular formula - correct answer the actual number of atoms of each element in a compound define what an orbital is...

1. what is water of crystallisation? - Ans .water molecules that make up part of the crystal structure of a solid 2. define relative isotopic mass - Ans .the ass of an atom of an isotope of an element relative to one twelfth the mass of an atom of C-12 3. why is relative atomic mass written as a decimal? - Ans .it is a weighted average mass 4. define molecular formula - Ans .the actual number of atoms of each element in a compound 5. define what an orbital is - Ans .a region within an at...