Our final lesson on heat loss was to do with radiation. Radiation is the name for heat travelling as heat rays. No particles are needed for this to happen, so radiation can happen in a solid, a liquid or a gas. It can even happen in space, where there are no particles at all. This is how heats gets to the Earth from the sun.

We investigated whether silver or black surfaces give out heat by radiation quicker. We measured the temperature of hot water in the beakers every 5 minutes for 20 minutes to find out how quickly they gave out heat.

Every group found that the black flask lost its heat quicker than the silver flask. This means that the black flask radiates heat faster than the silver flask.

We used different methods to separate mixtures. We used magnets to separate iron and sulphur ( solid and solid). We used filtering to separate sand from water (liquid and solid). We used chromatography to separate the different colours that make up black ink (different liquids).

We put filter paper with a dot on it in a beaker to see what happens and to see if it separates. We let the water soak upthe paper for ten minutes and the ink from the pen started to split and one side was red and one side was blue but they weren’t both splitting at the same times.

RT 1D3

that every substance has particles but different objects have different spaces in between them. In solids they are compact. In a liquid they can move.

DM 1G3