Matter and Scientific Method Quiz

Protons are subatomic particles that carry a positive electric charge. In contrast, electrons carry a negative charge, and neutrons are electrically neutral.

A gas has neither a definite shape nor a definite volume, expanding to fill whatever container it is placed in. Solids have both definite shape and volume, while liquids have a definite volume but take the shape of their container.

In chemistry, matter is broadly classified into pure substances (which have a constant composition) and mixtures (which consist of two or more different substances physically combined). Other options mix states of matter, specific objects, or basic building blocks.

Matter is the fundamental substance that makes up the physical universe, including stars, planets, and water, and existed long before humans. While humans can manipulate matter to create new materials, they do not create matter itself.

Liquids have a definite volume but no fixed shape, allowing them to flow and conform to the shape of whatever container they are poured into. This is because the particles in a liquid can slide past one another.

Solids have a fixed, definite shape because their particles are tightly packed together in a rigid structure and cannot move freely. Unlike liquids and gases, a solid will maintain its shape unless an external force is applied to break or deform it.

A scientific hypothesis is typically structured as an "If... then... because..." statement to clearly link the proposed cause, the expected effect, and the underlying scientific reasoning. This format makes the hypothesis testable and easy to evaluate during an experiment.

All physical matter on Earth, both living and non-living, is ultimately composed of atoms. While cells and organelles are the building blocks of living organisms, they themselves are made of molecules, which are composed of atoms.

A solid is characterized by having both a stable, definite shape and a definite volume. Its closely packed particles vibrate in place, preventing the substance from expanding or changing shape easily.

Matter is scientifically defined as anything that has mass and takes up space (volume). Although the phrasing "takes up mass" is grammatically awkward, the correct option "All of the above" encompasses these fundamental characteristics of matter.

The independent variable is the factor that the researcher intentionally changes or manipulates to observe its effects. While the dependent variable also changes in response, the independent variable is the one directly controlled and varied by the experimenter.