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Figure 2 shows information about three different materials, a composite, a glass and a metal - Edexcel - GCSE Chemistry - Question 2 - 2020 - Paper 1
Question 2
Figure 2 shows information about three different materials, a composite, a glass and a metal. | Material | Density | Ability to Conduct Electricity | Resistance t... show full transcript
Worked Solution & Example Answer:Figure 2 shows information about three different materials, a composite, a glass and a metal - Edexcel - GCSE Chemistry - Question 2 - 2020 - Paper 1
Step 1
Explain which material in Figure 2 is the most suitable material to use in electrical circuits.
Answer
The most suitable material for use in electrical circuits is the metal. The reasoning behind this is that metals are generally good conductors of electricity, which is a critical requirement for materials used in electrical applications. In contrast, both the composite and glass have poor conductivity.
Step 2
Nanoparticles are very small.
Answer
The radius of the nanoparticles is 17 nm, and the radius of a magnesium atom is 0.16 nm. To determine how many times larger the nanoparticles are compared to the magnesium atom, we can use the formula:
ext{Ratio} = rac{ ext{Radius of Nanoparticle}}{ ext{Radius of Magnesium Atom}} = rac{17 ext{ nm}}{0.16 ext{ nm}} \approx 106.25
Thus, the answer is approximately 100, which corresponds to option D.
Step 3
Step 4
Give one possible risk of using nanoparticles.
Answer
One possible risk of using nanoparticles is that they may have unknown long-term health effects on humans or the environment. Due to their small size, they can potentially penetrate biological barriers, leading to unforeseen toxicological impacts.