Grade 10 chemistry exercise test for best examiners with correct marking scheme of the 202, Exams of Chemistry

Download Grade 10 chemistry exercise test for best examiners with correct marking scheme of the 202 and more Exams Chemistry in PDF only on Docsity! Grade 10 chemistry exercise test for best examiners with correct marking scheme of the 2024  Physical change - Correct Answers A change in the size or form of a substance. No new substance is formed.  Chemical change - Correct Answers A new substance is formed.  How to tell chemical change? - Correct Answers Precipitate, change in color, gas formed, heat and light, and difficulty to reverse change.  Isotopes - Correct Answers Atoms of the same element having the same number of protons and electrons but a different number of neutrons  Ion - Correct Answers A charged Atom  Cations - Correct Answers Ions that have positive charges  Anions - Correct Answers Ions that has negative charges  Ionic compounds - Correct Answers Compounds that consists of positively charged metal ions and negatively charged non-metal ions.  Ionic bond - Correct Answers The attraction between cations and anions  Properties of ionic compounds - Correct Answers Hard brittle solid.  High melting points.  Crystal lattice structure.  Electrolytes - Correct Answers Substances that can dissolve in water to produce a solution that can conduct electricity  Molecular compounds - Correct Answers Compounds that contain neutral groups of atoms called molecules. Molecular compounds are formed from two or more nonmetals.  Covalent bond - Correct Answers A shared pair of electrons held between two non-metal Atoms  Properties of molecular compounds - Correct Answers At room temperature, some are solid, some are liquids, and others are gases.  Lower melting and boiling points then Ionic compounds.  Some are soluble in water others are not.  Do not conduct electricity.  Diatomic molecules - Correct Answers a molecule consisting of only two atoms of either the same or different elements.  Binary compounds - Correct Answers Compound that consists of only two elements.  Non-binary compounds - Correct Answers Compound that consists of more than two elements.  Combining capability (valence) - Correct Answers the number of electrons and elements needs to gain or lose (for ionic compounds) or share (for molecular compounds) to become stable.  Multivalent - Correct Answers Some metals, usually transition elements are multivalent. Multivalent elements have more than one combining capacity, valence.  Polyatomic ions - Correct Answers Groups of Atoms that tend to stay together and Carry and overall charge.  Binary acids - Correct Answers Compounds formed when hydrogen combines with a non-metal ion.  Oxyacids - Correct Answers Compounds formed when Hydrogen combines with a polyatomic ion.  The law of conservation of mass - Correct Answers The law of conservation of mass states that the total mass of the reactants is always equal to the total mass of the products. Matter cannot be created or destroyed during a chemical reaction. Atoms are simply rearranged to form new particles.  Synthesis reaction - Correct Answers A type of reaction that occurs when simple reactants combine to make one larger or more complex product.  Decomposition reaction - Correct Answers A type of reaction that involves the splitting of a large molecule into smaller molecules or elements.