The atomic nature of matter - Chapter 1

Question 1

What is nanoscience?

Answer 1

The study of nanoparticles and nanatechnology

Question 2

What is a nanometre?

Answer 2

nm = 10 to the power of -9 (relative to m)

Question 3

How do you convert to nanometres?

Answer 3

1. Get the length into metres
2. Write it in scientific notation (move the decimal point to after the first number
3. Depending on how many places the decimal moved, minus that from 9.
   eg. 15 mm = 0.015 m
   0.015 –> 1.5 (decimal point moved 2 to the right)
   Answer = 1.5 x 10(to the power of 7)

Question 4

What is the difference between an element and a compound?

Answer 4

An element is one or more of the same atom (O2) and a compound is one or more different atoms (H2O)
Elements are monatomic (made of one element)

Question 5

What is the structure of an atom?

Answer 5

The nucleus is made up of protons that are positively charged and neutrons that are neutrally charged. The atom has shells where the electrons are found.

Question 6

What is the force that attracts electrons to protons?

Answer 6

Electrostatic forces of attraction

Question 7

What is the atomic number?

Answer 7

The number of protons and the number of electrons. Positive = negative.
The number of protons determines the specific element.

Question 8

What is the atomic mass number?

Answer 8

The number of protons + neutrons