1: explain reaction metal with acids?
A: when metal reacts a dilute acids hydrogen gas is given and salt.
2: explain reaction metal and water?
A: very reactive mental react with water they give off hydrogen gas and formed alkali.
3: explain reaction metal with air?
A: many metal react slowly with the oxygen in air moist air causes metals to slowly corrode NASO
4: state some UN reacts on metals?
A: they are gold, silver.
5: state some reaction slowly of many years?
A: they are sink and iron
6:state three method that preventing rusting metals?
ü Painting
ü Oiling/greasing
ü Tin plating
7:explain calcium carbonate ?
A: calcium carbonate is one of the most abundant materials in the earth curst?
8: state calcium carbonate ?
A: they are chalk ,limestone and marble.
9: how are chalk is made ?
A: chalk was formed form the shells of dead sea animals by using high pressure ?
10: how are limestone is made ?
A: limestone was formed when using high pressure and on chalk .
11: state uses of limestone ?
A: limestone is used for
ü Extraction of iron
ü Neutralizing of acid
ü To make glass and concrete
12: how are marble is made ?
A:was formed high pressure and heat on chalk.
13: define concrete ?
A: concrete:- is mixture of cement sand water and gravel
14:state row materials of concrete ?
A: are cement sand water gravel .
15: state uses of concrete ?
A: is used building .
16: state row materials of cement?
A: are limestone and chalk.
17:state starting materials to menu faction of glasses ?
A: are sand {silicon dioxide } sodium carbonate and limestone .
18: state rate of temperature of these mixture of these materials ?
A: 1500
19: state uses of glasses?
A:they are:-
ü medicine bottle
ü milk bottles
ü mirrors and cars
