Materials 3ºESO C

The types of plastics are:

• Thermoplastics, thermosettings, elastomeric plastics and polyplastics.

• Polypropylene, PVC, microplastics and bioplastics.

• Transparent plastics and opaque plastics.

• Elastic plastics and rigid plastics.

When were the first man-made plastic developed?

• Around 1850

• Early twentieth century

• Late twentieth century

• Around 1800

Regarding environmental impact of plastics:

• Plastics decompose slowly.

• Plastic has a short term persistance.

• Their acumulation affects marine life, water quality and human health.

• Conventional plastics are biodegradable.

According to the definition, nanomaterials must have:

• At least 1 dimension in the nanoscale (range 1-100 nm)

• At least 1 dimension in the nanoscale (smaller than 1 nm)

• At least 2 dimensions in the nanoscale.

• The 3 dimensions in the nanoscale.

Principal applications for nanomaterials are:

• Medicine, biotechnology and electronic

• Quantum applications

• Manufacturing of microplastics

• Construction

Nanomaterials were seen for first time in the decade of...

(a)  

The types of stone materials are:

• Igneous, metamorphic and sedimentary

• Stone, binders, compounds, ceramics and glasses

• Hard and soft

• Rocks, sand, clay and silt.

What are the main environmental concerns related to the use of stone materials?

• There are no concerns because they are natural

• They cause noises and vibrations, CO2 emissions, liquid spills into water and energy consumption.

• Environment is not affected as stone materials are biodegradable

• Is due to the impossibility of reusing or recycling them

Tell me the two most common applications of stone materials

(a)  

First synthetic fiber appears in:

• Late 19th

• Early 20th

• Late 20th

• Medieval era