When oxygen in the air combines with the iron in a nail, the nail will rust. What is the product?

When wood is burned it combines with oxygen in the air to make smoke, water vapor and ash. Which of the following is a reactant?

If a mouse breaks a cookie, what type of change is that?

If a mouse digests a cookie, what type of change is that?

When a seed sprouts, what type of change is that?

If a bird breaks a stick, what type of change is that?

If a penguin sits on a cube of ice and the ice melts, what type of change is that?

If a sugar, eggs, and flour are baked into a cake, what type of change is that?

When icing is put on a cake, what type of change is that?

When baking soda is mixed with vinegar, lots of bubbles are produced? What type of change is that?

When salt is dissolved in water, what type of change is that?

Which of the following does not indicate a chemical change?

If a reaction starts with 50 grams of reactants, how many grams of product must be formed?

If a reaction has hydrogen in one of the reactants then at least one of the products formed in the reaction will also have hydrogen.

Chemical reactions