science J3 Book1 chap 1

(chemical or physical) 1. iron rusting 2. ice melting 3. apple juice turns brown 4. rotten of bread 5. open up a book 6. water vapor turns into cloud 7. evaporation of alcohol 8. drying up wet clothes 9. knock and produce noise 10. boiling of water 11. burning of paper 12. fermentation of grapes 13.movement of elevator 14. weathering of rocks

change can be classifying into __________ change and ____________ changes.

an acid is a compound that produced ________________ ion as the only positive ion during ionization.

acid turn litmus paper from _____________ to _____________

acid reacts with with active metals to release__________ gas.

an acid reacts with salt to produce a new _________ and a new ____________

hydrogen is in gaseous form at room temp in will turn into colourless liquid at _______‘c and turning into snow like solid at __________‘c

the density of hydrogen is the ________________

pure hydrogen gas burns in air with __________ flame

if you put egg shell in a test tube with hydrochloric acid what will happened?

hydrochloric acid / sulphuric acid / nitric acid • turns to white fume when exposed to the air • to remove rust from metal surface • to act as a dehydrating agent • can turn white sugar to black carbon. • in contains brownish nitrogen dioxide 6.the mixture of two acid to form aqua regia