Science Class 9: Properties of Matter

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Questions and Answers

Which method would be most effective for separating a mixture of iron filings and sand?

Distillation
Filtration
Magnet (correct)
Decantation

Which of the following is considered a qualitative property?

Luster (correct)
Density
Mass
Viscosity

During which phase change does a solid become a gas directly?

Sublimation (correct)
Solidification
Condensation
Melting

What happens to a liquid when it reaches its boiling point?

It becomes a gas (B) Signup and view all the answers

Which statement correctly describes density?

It is the amount of mass per unit volume. (C) Signup and view all the answers

What does the term 'reactivity' refer to in chemical properties?

The ability to react with other substances to form new substances (C) Signup and view all the answers

Which of the following best defines 'stability' in chemical terms?

The ability of a substance to remain unchanged or decompose (D) Signup and view all the answers

Which property describes the potential harm a substance can cause?

Toxicity (D) Signup and view all the answers

According to the particle theory of matter, what happens to particles when they are heated?

They move faster (C) Signup and view all the answers

Which of the following is NOT a characteristic of particles as described by the particle theory of matter?

Particles are always stationary (A) Signup and view all the answers

Which of the following defines a compound?

A pure substance made up of two or more different elements chemically combined. (B) Signup and view all the answers

What does viscosity measure?

The ease with which a liquid flows. (C) Signup and view all the answers

Which of the following is a qualitative physical property?

Color of a liquid. (C) Signup and view all the answers

How is density calculated?

Mass divided by volume. (B) Signup and view all the answers

What is the melting point of a substance?

The temperature at which a solid turns into a liquid. (B) Signup and view all the answers

What is the key characteristic of a pure substance?

It has a fixed composition and definite properties. (B) Signup and view all the answers

Which of the following best describes a homogeneous mixture?

A mixture that has a uniform composition throughout. (D) Signup and view all the answers

What distinguishes a compound from a mixture?

A compound is made of elements that are chemically combined. (B) Signup and view all the answers

What does the chemical property of combustibility refer to?

The ability of a substance to react and burn in air (A) Signup and view all the answers

Which statement about stability and disability is correct?

More stable substances take longer to break down (A) Signup and view all the answers

Which of the following is a correct example of a chemical property?

Flammability (D) Signup and view all the answers

What does toxicity measure in a substance?

The potential harm exposure to that substance can cause (B) Signup and view all the answers

What defines a metalloid?

It shares properties of both metals and nonmetals. (A) Signup and view all the answers

Which of the following is an example of a chemical property?

Reactivity of sodium with water (A) Signup and view all the answers

How can a substance be considered toxic?

If it exhibits harmful effects at high enough concentrations (B) Signup and view all the answers

What defines the reactivity of a substance?

How it interacts with other substances to form new entities (C) Signup and view all the answers

Which of the following is an example of combustibility?

Propane burning in a hot air balloon (C) Signup and view all the answers

What does stability indicate about a substance?

It resists decomposition or breakdown over time (C) Signup and view all the answers

Which of the following statements about toxicity is true?

Oxygen can be lethal at certain high concentrations (B) Signup and view all the answers

Which property best describes a substance's ability to burn in air?

Combustibility (C) Signup and view all the answers

Flashcards

Pure Substance

A substance with a fixed composition and definite properties.

Mixture

A combination of two or more substances where each keeps its own properties.