Welcome to Mrs Murphy (taking 1G3 on a Friday) and Miss Anderson (taking 1D3 on a Tuesday and Friday). And a farewell to Mr McClure and Miss Imrie who are no longer taking these classes.

I am sure we will have lots of fun together.

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

Today 1G3 were learning about radiation. we did an experiment where we got 2 metal beakers 1 of them was black the other was silver and filled them with boiling water, then we put the thermometer into the water we waited until the thermometer stopped moving and timed until it went cold.

A version of the teaching and learning materials for the heat part of the topic is available here. This goes into extra detail about designing fair experiments, how particle theory helps to explain how heat travels in solids liquids and gases practical applications of conduction, convection and radiation and how homes are insulated.

Ask about any of the topics in class.

Big file alert – this is a big file and might take a while to load. Not sure how it will cope with being on a phone – somebody let me know.

heat

1D3 and 1G3 both have homework due for next Wednesday (26th).

The Homework is Q 1 and 2 from the ‘Matter’ homework sheet.

There is a copy of the homework sheet following this link –

states-of-matter-homework

We did this experiment to find out what happens when we heat gas/air. We found out that when you heat gas it rises up which makes the top of the tube warmer than the bottom.

L.F

We did experiments to look at how heat traveled through solids. We then had to work out why heat traveled in this way by thinking back to how the particles were arranged in solids and how they react when they are heated. The process was called conduction.