Chemistry CSEC MC

Ethanol and water can be separated by fractional Distillation because they

• are chemically similar

• have different densities

• are immiscible

• have different boiling points

what is an atom

• smallest part of the universe

• smallest part of a substance

• smallest part of anything

• smallest part of water

Tags

NGSS.MS-PS1-1

What are the positively charged particles in an atom?

• Protons
• Neutrons
• Electrons

Tags

NGSS.MS-PS1-1

A catalyst  

• is added to a reaction to make it slow down 
• breaks apart and is changed 
• provides an energetic short cut to the products 

Tags

NGSS.HS-PS1-5

The compounds or elements present at the end of a reaction 

• reactants
• catalyst
• products
• energy 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following reactions is a combustion reaction ? 

• MgCO3 + O2 → MgO + CO2  
• C3H8 + 5O2 → 3CO2 + 4H2O 
  
• 6CO2 + 6H2O → C6H12O6 + 6O2 
• 6CO2 + 6H2O → C6H12O6 + 6O2 

Tags

NGSS.HS-PS1-4

Explain this graph

• A catalyst is used to speed up the reaction rate
• The catalyst provides a short cut to the products
• The red line shows how the catalyst saves energy 
• All of these choices

Tags

NGSS.HS-PS1-4

The rings around the nucleus of an atom are called...

• energy levels
• electron circles
• proton levels
• neutron clouds

What is the atomic number of Carbon-13 (C)?

• 13
• 12.01
• 6
• 26

How many neutrons would Potassium-41 (K) have?

• 22
• 19
• 41
• 1