Practice: matter and materials

Las preguntas de esta práctica

Puedes leerlas antes de empezar, hacerlas en un papel o repasarlas después. Cada una tiene su solución explicada.

1. 1 · Matter

   What are the three states of matter?

   Think about ice, water and steam.

   • a) Hot, warm and cold
   • b) Solid, liquid and gas
   • c) Hard, soft and fragile
   • d) Raw, man-made and recycled
   Ver la solución

   Respuesta: b) Solid, liquid and gas

   Matter can be solid, liquid or gas.

2. 2 · Matter

   Matter is made of very small particles called…

   They move closer or further apart with temperature.

   • a) cells
   • b) atoms
   • c) minerals
   • d) nutrients
   Ver la solución

   Respuesta: b) atoms

   All matter is made of atoms.

3. 3 · Match

   Match each change of state with what happens

   From… to…

   1. Melting
   2. Evaporating
   3. Condensing
   4. Solidifying

   • a) Gas → liquid
   • b) Liquid → gas
   • c) Liquid → solid
   • d) Solid → liquid
   Ver la solución

   Respuesta: Melting → Solid → liquid · Evaporating → Liquid → gas · Condensing → Gas → liquid · Solidifying → Liquid → solid

   Heat melts and evaporates; cold condenses and solidifies.

4. 4 · Changing state

   Drag the missing word

   Steam from the shower makes drops on the cold mirror.

   gas → liquid = ____

   Fichas: condensing · melting · evaporating · solidifying

   Ver la solución

   Respuesta: condensing

   When a gas turns into a liquid, it is condensing.

5. 5 · Inertia

   What is inertia?

   Think of the paper cup tower.

   • a) An object at rest stays at rest until a force acts on it
   • b) A force that pulls everything to the Earth
   • c) A material that dissolves in water
   • d) A kind of magnet
   Ver la solución

   Respuesta: a) An object at rest stays at rest until a force acts on it

   Inertia: objects at rest stay at rest, and moving objects keep moving, until a force acts on them.

6. 6 · Inertia

   In the cup tower, what happens if you pull the paper out slowly?

   Think about friction.

   • a) The cups stay still
   • b) Friction drags the cups and the tower falls
   • c) The cups float
   • d) Nothing at all
   Ver la solución

   Respuesta: b) Friction drags the cups and the tower falls

   Pulling slowly gives friction time to drag the cups with the paper.

7. 7 · Raw materials

   Match each raw material with where it comes from

   Ground, animals or plants?

   1. Wool
   2. Cotton
   3. Iron ore
   4. Honey

   • a) Animals
   • b) Animals (bees)
   • c) Plants
   • d) The ground
   Ver la solución

   Respuesta: Wool → Animals · Cotton → Plants · Iron ore → The ground · Honey → Animals (bees)

   Raw materials come from the ground, from animals or from plants.

8. 8 · Man-made materials

   Which man-made material do we make from sand?

   It is transparent and fragile.

   • a) Paper
   • b) Glass
   • c) Wool
   • d) Rubber
   Ver la solución

   Respuesta: b) Glass

   Sand is transformed into glass.

9. 9 · Concrete

   Drag the missing ingredient

   How do we make concrete?

   gravel + sand + water + ____

   Fichas: cement · cotton · salt · wool

   Ver la solución

   Respuesta: cement

   Gravel + sand + water + cement = concrete.

10. 10 · Recycling

    Why must we be careful with raw materials from the ground?

    Can they grow again?

    • a) Because they are not naturally replaced
    • b) Because they are too soft
    • c) Because they come from animals
    • d) Because they grow too fast
    Ver la solución

    Respuesta: a) Because they are not naturally replaced

    Metals and other materials from the ground don't grow again, so we must use them carefully and recycle.