Early Ideas About Matter

What does the Law of Conservation of Mass state?

• The mass of a closed system remains constant over time.

• Mass can be created or destroyed in a chemical reaction.

• The total mass of reactants is always greater than the total mass of products.

• Mass is only conserved in physical changes, not chemical changes.

What is a hypothesis?

• A proposed explanation for a phenomenon made as a starting point for further investigation through experimentation.

• A definitive conclusion based on extensive research and data analysis.

• A random guess made without any prior knowledge or evidence.

• A statement that cannot be tested or proven.

What does the term Homogeneous mean?

• Having a uniform structure or composition throughout; consistent and of the same or a similar kind or nature.

• Consisting of different elements or parts; varied and diverse.

• Easily separable into distinct components; not uniform.

• A mixture where the components are visibly different and can be separated easily.

Compound Noun

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[kom-pound]

• A substance formed when two or more different chemical elements are chemically bonded together in fixed proportions.

• A mixture of two or more substances that can be separated by physical means.

• A single element that cannot be broken down into simpler substances.

• A solution where one substance is dissolved in another.

What is an Atom?

• The smallest unit of ordinary matter that forms a chemical element, consisting of a nucleus and surrounding electrons.

• A large particle made up of multiple molecules.

• A type of chemical bond between two elements.

• A form of energy that can be converted into matter.

What is Atomic Theory?

• A scientific model explaining that all matter is composed of discrete, fundamental units called atoms.

• A theory that states all living organisms are made up of cells.

• A hypothesis that suggests the universe is made up of dark matter and energy.

• A principle that describes the behavior of gases under pressure.

What is Matter?

• A type of energy that can be converted into mass.

• The substance of which all physical objects are made, possessing mass and occupying space in the universe.

• A form of radiation that travels through space.

• A concept used to describe the absence of physical substance.

What is the definition of Mass Ratio?

• The proportion by mass of the elements that are present within a specific chemical compound.

• The total weight of an object regardless of its composition.

• The ratio of the volume of a substance to its mass.

• The relationship between the density and the mass of an object.

What is a Chemical Reaction?

• A process that involves the rearrangement of the molecular or ionic structure of a substance, as opposed to a physical change.

• A change in the physical state of a substance without altering its chemical composition.

• A method of separating mixtures into their individual components.

• A process that only occurs in living organisms.