Resistant- difficult to break
Fragile- breaks easily if we bend it or try to change its shape.
200
What are Natural Materials?
They come from nature and can come from plants, animals, or minerals
200
What is a heterogeneous mixture? Give an example
It´s easy to see the different substances.
Fruit salad.
300
What is solid? What is liquid?
Solid- has a definite shape and volume
Liquid- doesn´t have a definite shape but has a definit volume
300
When can physical changes occur? Name 6.
When we heat, freeze, bend, twist, stretch, or squash a substance.
300
What is rigid, flexible, and elastic?
Rigid- doesn´t bend easily
Flexible- we can bend
Elastic- returns to its original shape after we bend or stretch it
300
What are Manufactured materials?
Made from natural materials which are transformed in a manufacturing process
300
What is a homogeneous mixture? Give 2 examples
It isn´t possible to see the different substances
Mayonnaise and saltwater
400
What is gas? What do gases do to the containers they´re in?
Gas- doesn´t have a definite shape or volume
The shape and volume of air in balloons changes in different balloons.
400
When can chemical changes occur?
When we burn a substance or expose a substance to air.
400
What does transparent mean? What is its opposite? What does that mean? Give an example of each.
Transparent- light can pass through. Window
Opaque- Light can´t pass through. Door
400
Give three examples of materials we get from plants, three from animals, and two from minerals.
Plants- wood, cotton, and natural rubber
Animals- wool, leather, silk
Minerals- rocks and oil
400
What are the three R´s? What do they each mean?
Reduce- Use less materials and lower the amount of waste we produce
Reuse- Use materials again.
Recycle- Make something new from something we have used
500
What is mass? What is volume? What is expand? Give an example of something solid, liquid, and gas.
Mass- How much matter an object has. We can measure mass in grams and kilograms.
Volume- The amount of space that matter takes up.
Expand- to get larger in size and volume
Solid- ice Liquid- water Gas- air
500
Explain physical change in the water cycle. What changes?
In the water cycle, the water changes shape and changes state, but the substance doesn´t change. Throughout the water cycle, the water stays as water.
500
What are materials called when heat can´t pass through them easily? What are their opposite? What does it mean? Give an example of each.
Heat insulators. Mug
Heat conductors- Heat passes through some materials easily. Radiator
500
Give three examples of natural materials transformed in a manufactuting process.
Glass from sand
plastic from oil
fabrics from cotton or nylon
500
Give me two examples on how you can reduce, reuse, and recycle.
Reduce- Using fabric bags in order to reduce the amount of plastic bags. Turning off the lights when the sun is out.
Reuse- Fabric bags. Giving old glasses away for someone else to use
Recycle- old mobile phones. Old computer parts