Peet JH Semester Exam REVIEW - FALL 2024

Front

What is a dilute solution?

Back

A dilute solution is one that has a small amount of solute (like salt) compared to the amount of solvent (like water).

Front

How can you make a salt solution more dilute?

Back

By adding more water to the solution.

Front

What is evidence of a chemical change?

Back

Evidence of a chemical change includes bubbles or fizzing, color change, temperature change, and formation of a precipitate.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

Give an example of a physical change.

Back

Dry ice sublimating to a gas is an example of a physical change.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements.

Front

Which of the following is NOT a chemical formula: NaCl, H2O + NaCl, Be3PO4, O2?

Back

H2O + NaCl is NOT a chemical formula; it represents a mixture.

Front

What indicates an object is accelerating?

Back

An object is accelerating if it is changing its speed or direction.

Front

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

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

Front

What is an example of a chemical change?

Back

Iron rusting is an example of a chemical change.