Warrm-Up Day 14 : 4.2

Which of the following is a chemical change?

• Melting of ice

• Rusting of iron

• Boiling of water

• Breaking a glass

Which of the following is an example of a physical change?

• Burning wood

• Dissolving sugar in water

• Cooking an egg

• Baking a cake

Which of the following is a sign of a chemical reaction?

• Change in shape

• Change in temperature

• Change in size

• Change in state

Which of the following reactions is exothermic?

• Photosynthesis

• Combustion of gasoline

• Melting ice

• Evaporation of water

Which of the following is an endothermic reaction?

• Freezing of water

• Photosynthesis

• Condensation of steam

• Combustion of coal

Describe the difference between reactants and products in a chemical reaction.

• Reactants are substances that are produced, while products are substances that are consumed.

• Reactants are substances that are consumed, while products are substances that are produced.

• Reactants and products are the same substances.

• Reactants are always gases, while products are always solids.

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

• A substance changes from solid to liquid.

• A new color appears.

• A substance changes from liquid to gas.

• A substance changes from gas to solid.

Is milk going sour a physical or chemical change?

• Physical 
• Chemical

Tags

NGSS.5-PS1-4

Is copper tarnishing a physical or chemical change?

• Physical 
• Chemical

Tags

NGSS.5-PS1-4

Indicate parts of a chemical reaction: (a)   –> ​ (b)  

• Reactant
• Product
• Catalyst