Grade 9 Science

What is the best method of separation that is used to separate sand and table salt?

• paper chromatography

• filtration

• using a magnet

• fractional distillation

which substance is not part of the three states of matter.

• solid

• gas

• vapor

• liquid

Which group of elements do alkali metals belong to?

• Noble gases

• Group 7

• Group 1

• Period 3

How does evaporation help in the separation of mixtures?

• Evaporation creates a magnetic field to separate mixtures

• Evaporation converts liquid components into vapor, allowing for separation from solid components.

• Evaporation causes a chemical reaction to separate mixtures

• Evaporation increases the density of the mixture components

Which one is not a property of alkali metals?

• shiny when freshly cut

• good conductor of electricity

• form acidic oxides

• highly reactive with water

Explain the process of filtration in detail.

• Filtration is a technique used to combine different substances into a homogeneous mixture.

• Filtration is a process that involves heating a mixture to separate its components.

• Filtration involves passing a mixture through a filter medium that retains the solid particles while allowing the liquid or gas to pass through, separating the components based on their size and properties.

• Filtration is a method where solid particles are dissolved in a liquid solution.

What are the characteristics of solids?

• Definite shape but indefinite volume, weak intermolecular forces, closely packed particles

• Indefinite shape and volume, weak intermolecular forces, loosely packed particles

• Definite shape and volume, strong intermolecular forces, closely packed particles

• Definite shape and volume, weak intermolecular forces, loosely packed particles

Why are alkali metals stored under oil?

• To enhance their color

• To make them easier to handle

• To prevent reaction with air and moisture

• To increase their reactivity

Describe the process of evaporation as a method of separation.

• Evaporation involves freezing a liquid to separate it from other components.

• Evaporation involves heating a liquid to convert it into vapor, leaving behind solid or dissolved substances, which are then condensed back into liquid form.

• Evaporation is a method of separation that involves filtering a liquid to remove impurities.

• Evaporation is a process where a liquid is mixed with another liquid to form a new substance.

What are halogens and where are they located on the periodic table?

• Group 17 (Group VIIA)

• Period 3

• Group 8 (Group VIIIA)

• Located in the s-block