U5.S8. Materials and cycles on Earth

What charge do protons have?

• positive

• negative

• neutral (no charge)

Which subatomic particles have a negative charge?

• electrons

• protons

• neutrons

What is the name of the central part of an atom made up of neutrons and protons?

• nucleus

• centre

• quark

• neutrino

Which scientist came up with the plum pudding model of an atom?

• Dalton

• Rutherford

• Thomson

• Bohr

Oxygen’s atomic number is 8. This means that an oxygen atom must have

• 8 electrons
• 8 protons
• 8 neutrons
• a mass number of 8

If a diamond has 1000 parts, it is said to be pure diamond. If the diamond is mixed with parts of other atoms, what is the concentration of a diamond if it has at least 800 parts?

• 50 %

• 60 %

• 70 %

• 80 %

Gold is divided into 24 parts, with each single unit called a karat. The higher the karat, the purer the gold. How much is the concentration of gold in a 14 K neclace?

• 99.5 %

• 75 %

• 58.3 %

• 
  41.7 %

Say if this is an example of weather or climate: It is going to be cold in Maryland today, cloudy and 40 degrees.

• Weather

• Climate

Say if this is an example of weather or climate: Maryland has 4 seasons - winter, spring, summer, and fall.

• Weather

• Climate

What is the mixture of gases surrounding our planet called?

• atmosphere

• trees

• planet

• equator