🃏 Flashcards
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23 flashcards in this kit — the app reviews them with
spaced repetition so the right card returns on the right day.
Question
What is a substance?
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Answer
A substance is a form of matter that has a specific composition and distinct properties.
Question
What is an element?
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Answer
An element is a pure substance made of only one type of atom, which cannot be broken down into simpler substances by chemical means.
Question
What is a compound?
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Answer
A compound is a pure substance formed when two or more elements are chemically combined in a fixed ratio.
Question
What is a mixture?
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Answer
A mixture is a combination of two or more substances that are not chemically combined and can be separated by physical means.
Question
What is a homogeneous mixture?
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Answer
A homogeneous mixture has a uniform composition throughout, and its components cannot be seen separately.
Question
What is a heterogeneous mixture?
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Answer
A heterogeneous mixture does not have a uniform composition, and its components can be seen separately.
Question
What is a solution?
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Answer
A solution is a homogeneous mixture of two or more substances, where the particles are uniformly distributed.
Question
What is a solute?
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Answer
The solute is the substance that is dissolved in a solution.
Question
What is a solvent?
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Answer
The solvent is the substance that dissolves the solute in a solution.
Question
What is a suspension?
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Answer
A suspension is a heterogeneous mixture where solid particles are dispersed in a liquid or gas but do not dissolve and settle over time.
Question
What is a colloid?
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Answer
A colloid is a mixture where particles of one substance are dispersed in another but are larger than those in a solution and do not settle.
Question
What is the Tyndall effect?
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Answer
The Tyndall effect is the scattering of light by colloidal particles, making the path of light visible.
Question
What is a physical change?
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Answer
A physical change alters the form or appearance of a substance without changing its chemical composition.
Question
What is a chemical change?
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Answer
A chemical change results in the formation of new substances with different properties.
Question
What is an atom?
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Answer
An atom is the smallest particle of an element that retains the properties of that element.
Question
What is a molecule?
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Answer
A molecule is the smallest particle of a substance (element or compound) that can exist independently and retains its properties.
Question
What is the difference between an element and a compound?
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Answer
An element consists of only one type of atom, while a compound consists of two or more types of atoms chemically combined.
Question
What is the difference between a compound and a mixture?
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Answer
A compound is a pure substance with fixed composition and properties, while a mixture contains two or more substances physically combined with variable composition.
Question
Give an example of a homogeneous mixture.
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Answer
Salt dissolved in water is a homogeneous mixture.
Question
Give an example of a heterogeneous mixture.
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Answer
Oil and water is a heterogeneous mixture.
Question
What is the process of separating a mixture by evaporation?
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Answer
Evaporation separates a dissolved solid from a liquid by heating the mixture until the liquid turns into vapor.
Question
What is filtration?
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Answer
Filtration is a method to separate an insoluble solid from a liquid using a filter medium.
Question
What is the importance of substances in daily life?
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Answer
Substances are essential for various purposes: water for drinking, oxygen for breathing, and materials like metals and plastics for making objects.