Test: Mixing Materials - Year 3 MCQ

Solids have a definite shape and volume. They do not change shape unless acted upon by external forces, unlike liquids which take the shape of their container and gases which expand to fill available space.

A mixture is formed when two or more substances combine without undergoing a chemical change, allowing each component to retain its individual properties. This is different from compounds, where elements chemically bond and lose their original properties.

The primary purpose of filtering dirty water is to separate insoluble solids from liquids. This process cleans the water by allowing the liquid to pass through while trapping larger particles, making it suitable for various uses.

Excessive carbon dioxide in the atmosphere is a significant contributor to global warming, as it is a greenhouse gas that traps heat, leading to changes in climate patterns and rising global temperatures.

Chlorine gas is characterized by its yellow color and strong, pungent smell, which makes it easily identifiable. It is widely used in water treatment and as a disinfectant.

A coffee filter is designed with very tiny holes to allow liquid to pass through while trapping larger solid particles, making it suitable for separating coffee grounds from brewed coffee.

Mixing bicarbonate of soda with vinegar produces carbon dioxide gas, which can be observed as bubbles forming during the reaction. This gas is also used in various applications, including baking and fire extinguishing.

Natural gas is primarily used for cooking and heating homes. It is a versatile fuel that provides energy for various applications, including generating electricity.

When a soluble solid dissolves, it breaks down into particles that are too small to see, resulting in a homogeneous solution. This is typical of substances like sugar or salt when mixed with water.

A sieve is specifically designed with holes that allow smaller particles to pass through while retaining larger ones, making it effective for separating components of a mixture based on size.

When colored sugar is dissolved in water, the liquid may change color, illustrating how a soluble solid can affect the appearance of a liquid while remaining transparent.

Liquids possess the ability to adapt to the shape of their container while maintaining a constant volume. This is in contrast to solids, which have a fixed shape, and gases, which expand to fill the available space.

Most plastics are derived from oil, which is a fossil fuel. The refining process of oil yields various hydrocarbons that can be polymerized to create different types of plastic materials.

The properties of materials in a mixture remain unchanged during separation. This is because mixtures do not involve chemical reactions, allowing each component to retain its original characteristics.

Sand is classified as an insoluble solid because it does not dissolve in water. Instead, it remains as a separate solid component, allowing it to be easily filtered or settled out.