16/12/2019 Atoms, Compounds and Mixtures (STUDY BY TOPICS JUNIOR CLASS) 16/12/2019 0Comments by Gate Academy Welcome to your Atoms, Compounds and Mixtures (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. The chemical symbol "Ca" represents which of the following elements? Copper Carbon Calcium Sulfur 2. Where two or more substances are mixed together but not chemically combined, this substance is called a mixture an atom a compound a molecule 3. Study the four diagrams representing different substances. Which two of these diagrams represents elements? C and D A and B B and C A and D 4. The chemical symbol of helium is He Hm H HE 5. Which particles are to be found in the nucleus of an atom? Neutrons only. Protons, neutrons and electrons. ? ? ? Neutrons and protons. Electrons and neutrons. 6. Name the element that has an electronic structure of 2,4 Oxygen. Calcium. Beryllium. Carbon. 7. The following are examples of heterogeneous mixtures except petroleum salt solution air sugar solution 8. "Sub-atomic particle" is the name given to particles found in a nuclear submarine. the tiny particles found inside the nucleus. the tiny particles found inside an atom. the tiny particles found outside the nucleus. 9. Which component of atom is negatively charged neutron proton electron isotron 10. Nitrogen is in group V (5) of the periodic table. How many electrons are there in its outer shell? 7 5 21 14 11. The chemical symbol of potassium is D P K M 12. How many protons are there in an atom of sodium which has an atomic number of 11 and a mass number of 23? 34 11 12 23 13. When a substance is analysed using an electron microscope, it is found to contain only one type of atom.This substance is neither of the other three a mixture an element a compound 14. The chemical symbol of silver is Au Ag Ad Al 15. Which of the following pairs of properties is correct for the proton? Its got a charge of -1 and normally found inside the nucleus of an atom. Its got a charge of +1 and normally found outside the nucleus. Its got a charge of +1 and normally found inside the nucleus. Its got no charge and normally found inside the nucleus. 16. The chemical symbol of gold is Al Ag Ad Au 17. Water is a compound made up of two different elements. These elements are Sodium and chlorine Hydrogen and nitrogen Oxygen and iro Hydrogen and oxygen 18. Approximately how many elements are there on earth? 20 1000 100 10 19. Which one of the following substances is a compound? Iron Oxygen Hydrogen Sodium fluoride 20. Which one of the following elements is used in party balloons? Neon Helium Oxygen Nitrogen 1 out of 20 Time is Up! Time's up
