Atoms

Question 1

What is an element?

Answer 1

a substance made up of one type of atom

Question 2

What is a compound?

Answer 2

a substance made up of more type of atoms that are chemically bonded together

Question 3

list some properties of metals

Answer 3

• high melting point
• high boiling point
• sonorous
• shiny
• brittle
  -good conductots of electricity

Question 4

Why is water not an element but a compound?

Answer 4

water is a compound because compounds are made of two or more types of atoms, water contains hydrogen and water that chemically bond together

Question 5

what is it meant by conservation of mass?

Answer 5

• during chemical reactions atoms cannot be created or destroyed, they can only be rearranged meaning total mass of reactants= total mass of products

Question 6

Describe the structure of a nucleus in an atom:

Answer 6

• atoms are very small
• they have a radius of about 1X10^-10m

Question 7

in an atom where is most of the mass concentrated at?

Answer 7

• in the nucleus

Question 8

describe the particles in the nucleus of an atom:

Answer 8

• contains two types of sub-atomic particles

Question 9

where are electrons orbitting?

Answer 9

• energy levels

Question 10

what is the mass number of an atom?

Answer 10

• protons + neutrons

Question 11

what is the atomic nmber:

Answer 11

• the number of protons and electrons

Question 12

difference between atomic number and mass number?

Answer 12

atomic number- protons and electrons

mass number- protons plus neutrons

Question 13

location of protons, neutrons and electrons:

Answer 13

• protons- nucleus
• neutrons- nucleus
• electrons- around energy levels