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. An atom of nitrogen has 7 protons and 7 neutrons in its nucleus. What is its electronic structure? 5,2 2,5 2,8,4 2,7 2. Which one of the following substances is a compound? Sodium fluoride Hydrogen Oxygen Iron 3. The amount of a substance that can exist separately is called entity molecule formulae atom 4. An atom of aluminium has 14 protons, 13 neutrons and 13 electrons. 13 protons, 13 neutrons and 14 electrons. 13 protons, 14 neutrons and 13 electrons. 13 protons, 13 neutrons and 27 electrons. 5. If a substance consists of more than one type of atom chemically combined, then it is a molecule an element a mixture a compound 6. 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 no charge and normally found inside the nucleus. Its got a charge of +1 and normally found inside the nucleus. Its got a charge of +1 and normally found outside the nucleus. 7. The smallest part of a compound which still has the properties of that compound is called a solid a molecule a mixture an atom 8. The chemical symbol "Ca" represents which of the following elements? Calcium Sulfur Copper Carbon 9. Name the element that has an electronic structure of 2,4 Carbon. Oxygen. Calcium. Beryllium. 10. Where two or more substances are mixed together but not chemically combined, this substance is called a molecule a compound a mixture an atom 11. Which one of the following statements is correct? Water and nitrogen are both compounds. Water is an element and nitrogen is a compound. Water is a compound and nitrogen is an element. Water and nitrogen are both elements. 12. When a substance is analysed using an electron microscope, it is found to contain only one type of atom.This substance is a compound an element a mixture neither of the other three 13. Which one of the following represents the compound called carbon dioxide? C CO2 CO H2O 14. Which particles are to be found in the nucleus of an atom? Electrons and neutrons. Neutrons only. Protons, neutrons and electrons. ? ? ? Neutrons and protons. 15. The chemical symbol of potassium is M K D P 16. Water is a compound made up of two different elements. These elements are Hydrogen and oxygen Hydrogen and nitrogen Oxygen and iro Sodium and chlorine 17. Matter is the ‘stuff’ that all things are made of, including us.The diagram shows how some types of matter are classified.The diagram is not complete.Elements are often divided into two sub-groupsWhat are these two sub-groups A and B? Non-metals and gases Metals and non-metals Liquids and gases Metals and liquids 18. Nitrogen is in group V (5) of the periodic table. How many electrons are there in its outer shell? 14 21 7 5 19. How many different types of atom may be present in a compound? Three or more different atom types Exactly four different atom types Only one type of atom Two or more different types 20. Which component of atom is negatively charged proton neutron electron isotron 1 out of 20 Time is Up! Time's up
