__________ is the occasional occurrence when a solid turns directly into a gas without turning into a liquid first.

Around 1774 Antoine Lavoisier and his wife Marie-Anne disproved the phlogiston theory by naming a new element that we call ____.

Matter is defined as ____.

Energy is defined as _____.

Matter is defined as ____.

Which state of matter has a fixed volume but no fixed shape?

 Which of the following is a physical property of copper?

Chemical elements like carbon, oxygen, and nitrogen are considered _____.

Describing material as having the “ability to oxidize” is a ___________.

At 125 °C, the pressure of a sample of He gas is 345 mmHg. At what temperature (°C) will the pressure become if the volume remains constant?