Which statement about matter is correct?
Responses
A In matter, molecules never stop moving.In matter, molecules never stop moving.
B In the solid state, molecules stop moving.In the solid state, molecules stop moving.
C Pressure and temperature do not affect matter.Pressure and temperature do not affect matter.
D Liquids have a lower level of energy than solids.
A In matter, molecules never stop moving
The correct statement about matter is A: "In matter, molecules never stop moving."
Explanation:
To determine the correct statement about matter, we need to understand the properties and behavior of molecules in different states of matter.
In matter, which refers to everything that occupies space and has mass, molecules are constantly in motion. This is true for all states of matter: solid, liquid, and gas. The movement of molecules is due to the kinetic energy they possess.
In solids (option B), while molecules do have less freedom of movement compared to liquids and gases, they still vibrate and oscillate around fixed positions. So, the molecules in solids do not stop moving completely.
Pressure and temperature (option C) do have an effect on matter. For example, increasing the pressure can cause gases to condense into liquids or solids. Similarly, changing the temperature can cause substances to transition between different states of matter.
The statement in option D, "Liquids have a lower level of energy than solids," is not generally true. The energy level of a substance does not solely depend on its state but also on other factors like intermolecular forces and temperature. In fact, the energy levels can vary for different substances and even within the same state of matter.
In conclusion, the correct statement about matter is A: "In matter, molecules never stop moving." This statement reflects the fundamental behavior of molecules in all states of matter.