Science 7 Quarterly Assessment

How does the uniformity of particles in pure substances relate to their classification as either elements or compounds?

• Elements are classified as pure substances because they are made of different types of particles, while compounds consist of a single type of particle.

• Both elements and compounds are classified as pure substances because they consist of only one type of particle, with elements made of one type of atom and compounds made of one type of molecule.

• Compounds are classified as pure substances because they consist of multiple types of atoms, whereas elements are not considered pure substances.

• The classification of elements and compounds as pure substances is unrelated to the uniformity of particles; it depends solely on their physical state (solid, liquid, or gas).

Mikha and Maloe bought Popsicle after their volleyball practice. In their way back to the ground, they noticed that the Popsicle starts to melt. Which process involves in the situation?

• Boiling

• Deposition

• Melting

• Vaporization

Which is the correct sequence of changing solid to gas?

• Melting, boiling, evaporation

• Boiling, melting, evaporation

• Deposition, melting, boiling

• Melting, deposition, evaporation

How can you relate the temperature to the change in phase of matter?

• Solid melts when temperature decreases.

• Water boils when temperature increases.

• Gas solidifies when temperature decreases.

• Water freezes when temperature increases.

How does the temperature affect the state of water and the movement of its particles at different points (freezing, room temperature, and boiling)?

• At the freezing point (0°C), water molecules move rapidly and spread out, causing the water to solidify into ice.

• At room temperature, water molecules have moderate motion, maintaining the liquid state where particles are close but can flow past one another.

• At the boiling point (100°C), water molecules move rapidly and spread out, causing the water to transition into gas.

• At the boiling point, the particles are tightly packed, leading to a solid state.

What occurs to the energy when a substance transitions from a gas to a liquid state?

• Energy is absorbed to the atmosphere to change a substance from gas to liquid.

• Energy is release by the atmosphere to change a substance from gas to liquid.

• Energy is absorbed by the atmosphere to change a substance from gas to liquid.

• Energy is release to the atmosphere when a substance changes from a gas to a liquid.

Which situations describe that particles of matter tend to group together when temperature decreases?

• Situations 1 & 2

• Situation 3

• Situations 2 & 3

• Situations 1, 2 & 3

What do you call a motion where the particles of matter are always on the move and such motion is triggered by agitation?

• Brownian Motion

• Circular Motion

• Linear Motion

• Newtonian’s Motion

What happens when a saltwater solution is heated and then cooled, and how does this relate to the nature of particles? Select all that apply.

• Heating causes the salt to evaporate, leaving only water.

• When the solution cools, salt particles slow down and tend to group together, forming crystals.

• The size of the crystals depends on how quickly the solution is cooled.

• The salt particles dissolve further into the water as it cools.

What does the swirling pattern of coffee powder in water or smoke from a candle flame illustrate about particle movement?