Review first semester

Elsa dropped a piece of metal into a beaker, and then she added acid. She saw colorless bubbles rising from the metal. The metal began to turn black. What type of change did Elsa see?

• physical, because the acid changed phase

• chemical, because a new gas was formed

• physical, because the metal changed color

• chemical, because the metal changed phase

What happens when chemical bonds break and new bonds form?

• a physical change
• a chemical reaction
• matter is destroyed
• surface area increases
  

The substances listed on the left side of a chemical equation are the

• Products
• Coefficients
• Precipitates
• Reactants

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.
• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• Matter is not changed.
  

Energy due to motion is ____________ energy. 

• Potential 
• Energy
• Kinetic
• Friction

The faster an object moves, the ________ kinetic energy it has. 

• more
• less
• none of the above
• all of the above 

What kind of energy is in a rock at the edge of a cliff?

• Potential
• Kinetic

At which point is potential energy greatest?

• W
• X
• Y
• Z

Element or Not an Element? Is this on the periodic table??

• Yes

• No

• Possibly depending on the weather

Element or Not an Element? Is this on the periodic table??

• Yes

• No

• Possibly depending on the weather