Midterm 24/25

Front

What happens to the number of valence electrons across a period in the periodic table?

Back

The number of valence electrons increases from left to right.

Front

What is an appropriate way to dress in the lab?

Back

Pulling long hair back is an appropriate way to dress in the lab.

Front

Can I perform my own unauthorized experiments with lab materials?

Back

Never.

Front

What does the electrical symbol represent in the lab?

Back

It indicates the presence of electrical equipment and warns about potential dangers.

Front

What is a substance made up of only one kind of atom called?

Back

Element.

Front

What is the definition of a compound?

Back

A substance formed when two or more elements are chemically bonded together.

Front

What is a homogeneous mixture?

Back

A mixture that has a uniform composition throughout.

Front

What is a solution?

Back

A homogeneous mixture where one substance is dissolved in another.

Front

What does the disposal symbol indicate?

Back

It indicates that the material cannot be disposed of in regular garbage and requires special disposal instructions.

Front

What is the significance of the extreme temperature symbol in the lab?

Back

It indicates that protection is required when handling items that may be extremely hot or cold.