Elements and Gases Crossword Puzzle

QUESTIONS LIST:

• alkali: the name given to metals of group 1
• halogen: the name given to elements of group 7
• lithium: the least reactive metal in group 1
• fluorine: the most reactive elements in group 7
• tarnish: the newly cut na will _ quickly on exposure to air
• lilac: the flame colour when potassium burns
• ionic: type of bonding formed when group 1 reacts with group 7
• phenolphthalein: the indicator that turns pink when sodium reacts with water
• corrosive: you can’t touch na with bare hands because it’s _
• hydroxide: the ion responsible for the color change of universal indicator when k reacts with water
• bromine: halogen that is liquid at room temperature
• iodine: halogen that is solid at room temperature
• diatomic: f2 is called _ molecule because two atoms bonded to form the molecule.
• poisonous: halogens have to be handled in a fume cupboard because they are extremely _
• bleached: when cl2 is passing through damp litmus paper, it will get _
• hydrochloric: the acid formed when hcl dissolved in water.
• displacement: _ reaction can be used to determine the reactivity of halogens
• spectator: ions that are not changed in a chemical reaction.
• nitrogen: the most abundant gas in air.
• greenhouse: carbon dioxide can cause global warming because it’s _ gas.
• thermal: breaking up of something by heating it is called () decomposition reaction
• green: the color of cuco3