Describing and Classifying Matter

Front

Shape is a ____ that helps identify an object.

Back

physical property

Answer explanation

Shape is a physical property that helps identify an object, distinguishing it from other objects based on its form. Chemical properties relate to substance reactions, while mass and matter are broader concepts.

Front

Density: Chemical or Physical Property

Back

Physical Property

Answer explanation

Density is a measure of mass per unit volume, which can be observed without changing the substance's chemical identity. Therefore, it is classified as a physical property.

Front

Flammability (burns): Chemical or Physical Property

Back

Chemical Property

Answer explanation

Flammability is a chemical property because it describes a substance's ability to undergo a chemical change when exposed to fire, resulting in combustion. Thus, the correct choice is 'Chemical Property'.

Front

Reacts with Acid: Chemical or Physical Property

Back

Chemical Property

Answer explanation

Reacts with acid is a chemical property because it describes a substance's ability to undergo a chemical change when interacting with acids, indicating a transformation at the molecular level.

Front

Sour Taste: Chemical or Physical Property

Back

Physical Property

Answer explanation

Sour taste is a characteristic of substances that indicates the presence of acids, which is a physical property. It describes how a substance interacts with our taste receptors, rather than changing its chemical composition.

Front

Reacts with Water: Chemical or Physical Property

Back

Chemical Property

Answer explanation

Reactivity with water indicates a chemical change, as it involves the formation of new substances. Therefore, this is classified as a chemical property, not a physical property.

Front

Odor: Chemical or Physical Property

Back

Physical Property

Answer explanation

Odor is a characteristic that can be observed without changing the substance, making it a physical property. Chemical properties involve changes in composition, which does not apply to odor.

Front

Is water, H₂O, a mixture, element, or compound?

Back

compound

Answer explanation

Water, H2O, is a compound because it consists of two hydrogen atoms chemically bonded to one oxygen atom. Unlike mixtures, compounds have a fixed composition and distinct properties.

Front

Is Chlorine, Cl, a mixture, element, or compound?

Back

element

Answer explanation

Chlorine, Cl, is an element because it consists of only one type of atom. Elements are pure substances that cannot be broken down into simpler substances, unlike mixtures and compounds.

Front

An atom is:

Back

basic unit from which all matter is made

Answer explanation

An atom is the basic unit from which all matter is made, consisting of protons, neutrons, and electrons. The other options describe molecules or compounds, not atoms.