Modeling Physical and Chemical Properties

Front

Which of the following is a chemical change? folding, boiling, cooking, raising temperature

Back

cooking

Front

Which of these is a physical change? dissolving, burning, tarnishing, reacting to acid

Back

dissolving

Front

Which of these is a chemical property? state of matter, malleability, viscosity, flammability

Back

flammability

Front

What does the law of conservation of mass tell us about atoms during chemical changes?

Back

They can rearrange, but there has to be the same amount of each element before and after a reaction.

Front

What does a coefficient tell you when reading a chemical equation?

Back

how many molecules there are

Front

What does a subscript tell you in a chemical formula?

Back

how many atoms there are

Front

Chemical equation: Ca + H₂O -----> Ca(OH)₂ + H₂. What coefficient is needed in front of the water molecule formula to balance it?

Back

2

Front

Which of these models shows a correct chemical reaction?

Back

Front

What happens to molecules during all chemical changes?

Back

the chemical bonds break and atoms reform new bonds