Twig Main Stage Preassessment

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound or molecule.

Front

What does a model of atoms and molecules represent in a chemical reaction?

Back

It shows how atoms and molecules rearrange to form new substances during a chemical reaction.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its composition, while a chemical change results in the formation of new substances.

Front

If an oreo cookie weighs 20 grams and is crushed, what will the weight of the crumbs be?

Back

20 grams, because the mass is conserved in a physical change.

Front

What happens to molecules during a chemical reaction?

Back

Molecules rearrange to form new molecules, resulting in a change in properties.

Front

What is an example of a physical change?

Back

Smashing cookies is a physical change because it changes the shape but not the chemical composition.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

What is the significance of chemical equations?

Back

Chemical equations represent the reactants and products in a chemical reaction, showing the conservation of mass.