Quiz on Mixtures and Pure Substances

Is the salad a pure substance or a mixture?

• PURE

• MIXTURE

Answer explanation

A salad consists of various ingredients like vegetables, dressings, and toppings, which are not chemically combined. Therefore, it is classified as a mixture, not a pure substance.

Is distilled water a pure substance or a mixture?

• Pure

• Mixture

Answer explanation

Distilled water is a pure substance because it consists only of H2O molecules, with no impurities or other substances mixed in. This makes it distinct from mixtures, which contain two or more different components.

Is gold a pure substance or a mixture?

• PURE

• MIXTURE

Answer explanation

Gold is a pure substance because it consists of only one type of atom, making it a homogeneous material. Unlike mixtures, which contain two or more different substances, pure gold has a consistent composition.

Is a chocolate chip cookie a pure substance or a mixture?

• Pure

• Mixture

Answer explanation

A chocolate chip cookie is a mixture because it contains various ingredients like flour, sugar, chocolate chips, and butter, which retain their individual properties and can be separated, unlike a pure substance.

Is oxygen gas a pure substance or a mixture?

• PURE

• MIXTURE

Answer explanation

Oxygen gas (O2) is a pure substance because it consists of only one type of molecule. Unlike mixtures, which contain two or more different substances, pure substances have a uniform composition and distinct properties.

Is soil a pure substance or a mixture?

• PURE

• MIXTURE

Answer explanation

Soil is a mixture because it consists of various components, including minerals, organic matter, water, and air, rather than being a single pure substance. Therefore, the correct answer is MIXTURE.

Is ocean/sea water a pure substance or a mixture?

• PURE

• MIXTURE

Answer explanation

Ocean/sea water is a mixture because it contains various dissolved salts, minerals, and organic materials, making it not a pure substance. Therefore, the correct answer is MIXTURE.

Is air a pure substance or a mixture?

• PURE

• MIXTURE

Answer explanation

Air is a mixture because it consists of various gases, primarily nitrogen and oxygen, along with trace amounts of other substances. Unlike a pure substance, which has a uniform composition, air's composition can vary.

Is table salt (sodium chloride) a pure substance or a mixture?

• PURE

• MIXTURE

Answer explanation

Table salt, or sodium chloride, is a pure substance because it consists of only one type of particle, Na+ and Cl- ions, in a fixed ratio. It does not contain any other substances, making it a pure compound.

Is milk a pure substance or a mixture?

• PURE

• MIXTURE

Answer explanation

Milk is a mixture because it contains water, fats, proteins, and other components that can be separated. Unlike a pure substance, which has a uniform composition, milk's composition varies.