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Welcome toSpringhead Primary School

Welcome toSpringhead Primary School

Year 4

Science Week 14th-18th March 

Science - States of Matter

Lesson 1

We were given three balloons, one filled with water, one with air and one with ice. We observed what happened to the contents of each balloon when we opened it.

  • The ice inside the balloon maintained its shape once the balloon was removed. We decided that ice is a solid.
  • When we opened the balloon filled with water, the water poured out of the balloon and took the shape of the tray. We decided that water is a liquid.
  • When we opened the balloon filled with air, the air escaped and, although we couldn’t see it, we worked out that the air went all around us. We decided that air is a gas.

Next, we sorted different materials into solids, liquids and gases.

We had a discussion about whether sand is a solid or a liquid.

In the end, we decided that sand is a solid.

Science - States of Matter

Lesson 2

Today, we designed an experiment to test the viscosity of different liquids.

We used a tray leant against a brick to create a ramp. We then drew a start and finish line on our trays. We used 5ml syringes to collect the different liquids. We set the liquids off from the start line one at a time and timed how long it took them to reach the finish line. We kept it a fair test by keeping these things the same:

  • The gradient of the ramp
  • The distance from the start to finish line
  • The amount of liquid

The only thing we changed was the liquid.

We found out that ketchup is the most viscous liquid because it hardly moved in the 4 hours that we observed it. The cream and oil were the least viscous because they moved down the ramp fastest.

Science - States of Matter

Lesson 3

Changing States

We prepared some food for a party using heating and cooling to change the states of different ingredients.

We made chocolate crispy buns by melting chocolate. We recorded the temperature of the chocolate at regular intervals and used this to create a time graph later in the lesson.

We made ice cream two different ways by cooling liquids until they became solid.

Science - States of Matter

Lesson 4

Observing Gases

In this lesson, we observed gases by comparing balloons filled with air and helium. We learned that balloons filled with helium float while balloons filled with air sink because helium is lighter than air.

We then placed 6 raisins into a bottle of water and 6 raisins into a bottle of lemonade. We observed that the raisins in the water stayed at the bottom of the bottle but in the lemonade, they floated to the top. This was because bubbles of gas in the lemonade attached themselves to the rough surface of the raisin. When there were enough bubbles on the raisin, it floated because the gas in the bubbles is lighter than the liquid. Once the raisins reached the top of the bottle, the bubbles began to burst and the raisin sunk to the bottom of the bottle again.

Finally, we caught gas in balloons by placing effervescent vitamin c tablets into bottles of water and quickly attaching a balloon to the neck of the bottle. The tablets created gas in the water, which made the balloons inflate.

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