Photosynthesis & Chemical/Physical Reactions

Is wood burning a physical or chemical change?

• Physical 
• Chemical

Is milk going sour a physical or chemical change?

• Physical 
• Chemical

Is sharpening a pencil a physical or chemical change?

• Physical 
• Chemical

Is copper tarnishing a physical or chemical change?

• Physical 
• Chemical

Which of the following is a reactant

• CH₄
• H₂O
• CO₂
• 2H₂O

The Law of Conservation of Mass tells us matter can't  ______________.

• change color
• change state of matter
• be created or destroyed
• change temperature

A chemical change is different than a physical change because in a chemical change

• chemicals are used

• molecules do not physically touch

• a new substance is formed and in a physical no new substance is formed

• the change can be seen but in a physical change it cannot

Which is the correct word equation for photosynthesis?

• water + glucose + oxygen ---> energy + carbon dioxide

• light energy + oxygen + carbon dioxide ---> water + glucose

• water + carbon dioxide + light energy ---> glucose + oxygen

• glucose + oxygen ---> water + carbon dioxide + energy

The Krebs Cycle aka the Citric Acid Cycle (Step 2 in CR) takes place in what location?

• Cytoplasm

• Matrix of Mitochondria

• Nucleus

• Ribosome

Which of the following is a common sign that a chemical change has occurred?

• A chemical has turned a different color, bubbled, and/or changed temperature.

• A chemical has changed to a different state of matter, such as a liquid to a solid.

• A chemical has changed size.

• A chemical has become a different shape.