Quiz 5

What are the two components of a solution?

• Solute and Solvent

• Homogeneous and Heterogeneous

• Soluble and Insoluble

• Physical and Chemical

Answer explanation

A solution consists of two main components: the solute, which is the substance being dissolved, and the solvent, which is the substance that dissolves the solute. Therefore, the correct answer is 'Solute and Solvent'.

All are examples of soluble substances, except:

• Salt

• Food Coloring

• Vinegar

• Soil

Answer explanation

Soil is not a soluble substance; it consists of various particles and organic matter that do not dissolve in water. In contrast, salt, food coloring, and vinegar are all soluble in water.

In which phase of matter do particles move the fastest?

• Solid

• Gas

• Liquid

• Plasma

Answer explanation

In the gas phase, particles have high kinetic energy and move rapidly and freely compared to solids and liquids, where particles are more tightly packed and move slower. Therefore, gas is the phase where particles move the fastest.

Matter exists in three forms: gas, solid, and _______.

• Plasma

• Liquid

• Lightning

• All of the above

Answer explanation

Matter exists in three primary states: solid, liquid, and gas. While plasma is a state of matter, it is not one of the three main forms. Therefore, the correct answer is liquid.

Which of the following is a sign that a chemical reaction has occurred?

• Change in shape

• Melting

• Formation of a gas

• Dissolving

Answer explanation

The formation of a gas is a clear indicator of a chemical reaction, as it often results from new substances being created. In contrast, changes in shape, melting, and dissolving do not necessarily indicate a chemical change.

Which is an example of a chemical reaction?

• Paper cut into small pieces.

• Flour and sugar mixed in a bowl.

• Chocolate melting in a pan

• Cookies baking in an oven

Answer explanation

Cookies baking in an oven is a chemical reaction as it involves the transformation of ingredients through heat, resulting in new substances. The other options are physical changes, not chemical reactions.

Cooking and burning are examples of what kind of change in matter?

• Reversible change

• Semi Change

• Irreversible change

• Supernatural Change

Answer explanation

Cooking and burning involve chemical reactions that change substances into new ones, making them irreversible. Once food is cooked or materials are burned, they cannot return to their original state, confirming they are irreversible changes.

Melting, boiling and condensations are example of what kind of change in matter?

• Reversible change

• Semi Change

• Irreversible change

• Supernatural Change

Answer explanation

Melting, boiling, and condensation are physical changes that can be reversed. For example, ice can melt to water and then freeze back to ice, making them reversible changes in matter.

What is the process called when a solid turns directly into a gas without becoming a liquid first?

• Condensation

• Sublimation

• Melting

• Solidification

Answer explanation

The process when a solid turns directly into a gas without becoming a liquid is called sublimation. This occurs in substances like dry ice, which transitions from solid to gas at room temperature.

When you cool a gas down and it turns into a liquid, what is this process called?

• Condensation

• Sublimation

• Melting

• Deposition

Answer explanation

The process of cooling a gas until it turns into a liquid is called condensation. This occurs when gas molecules lose energy and come together to form a liquid, distinguishing it from other processes like sublimation or melting.