CHEMICAL REACTIONS - Test

Kai is conducting an experiment where he mixes two chemicals in a beaker, and the temperature of the mixture decreases. In this endothermic reaction, heat is ...

• taken in or absorbed

• given out or released 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When does a chemical reaction stop?

• When the lab is finished

• When the excess reactant is used up

• When the limiting reactant is used up

• Chemical reactions never stop

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

• 4Fe + 3O₂ -> 2Fe₂O₃
• 2 Fe + 3O₂ -> Fe₂O₆
• 4 Fe + O₆ -> 2Fe₂O₃
• None of the options are correctly balanced.

Tags

NGSS.MS-PS1-5

Balance this equation...
HgO --> Hg + O₂

• It is balanced 
• 2HgO --> Hg + O₂
• 2HgO --> 2Hg + O₂
• I don't know...Oh well!

Tags

NGSS.MS-PS1-5

What happens in ALL chemical changes?

• Change in state of matter
• A new substance is formed
• Bubbles are produced
• An explosion

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In reactions, products must be equal to..

• Products

• Reactants

• Starters

• Enders

Tags

NGSS.MS-PS1-5

Water can dissolve many things so it is called the .....

• wonderful water
• cohesion
• liquid
• universal solvent

The thing that does the dissolving

• Solute
• Solvent
• Colloid
• Solution

According to the law of conservation of mass, how does the amount of each element on the product side compare to each element on the reactant side?

• The amount of atoms on each side is equal

• The amount of atoms on the product side is greater

• The amount of atoms on the reactant side is greater

• Depends on the reaction

Tags

NGSS.MS-PS1-5

Balance the following chemical equation:

____KClO₃ → ____KCl + ____O₂

• 2KClO₃ → 4KCl + O₂

• 4KClO₃ → 2KCl + 3O₂

• 2KClO₃ → 2KCl + 3O₂

Tags

NGSS.MS-PS1-5