GN6002_Telangana board_7th class_States of Matter

Which of the following statements best describes a gas's particles compared to a liquid?

• Gas particles are more densely packed and move slower than those in a liquid.

• Gas particles have a fixed shape and volume, while liquid particles do not.

• Gas particles move more rapidly and are farther apart than those in a liquid.

• Gas particles are attracted to each other more strongly than liquid particles.

Answer explanation

Gas particles have more energy and are less densely packed than in a liquid, allowing them to move more freely and occupy a greater volume.

Tags

NGSS.MS-PS3-4

In a __________, the particles are tightly packed in a regular pattern and vibrate in place, which gives this state of matter a fixed shape and volume.

Answer explanation

Solids have a set shape and volume because their particles are closely packed and only vibrate around fixed positions.

Order the following states of matter from least to most energetic:

• 
• 
• 

Answer explanation

As energy is added to a solid, the first change of state is melting, where the solid turns into a liquid. As more energy is added, the liquid then undergoes vaporization, turning into a gas. Condensation and sublimation are not part of the sequence from the addition of energy to a solid; condensation is the change from a gas to a liquid (removal of energy), and sublimation is the direct change from a solid to a gas without passing through the liquid phase (which occurs under certain conditions and is not typically part of the heating sequence for most substances).

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Draw a diagram that illustrates the particle arrangement and movement for each of the three states of matter: solid, liquid, and gas. Ensure that your drawing accurately reflects the spacing, organization, and motion of the particles typical for each state.

Tags

NGSS.MS-PS1-4

Which of the following statements are true about the changes in states of matter?

• Sublimation is the transition of a substance directly from a solid to a gas without passing through the liquid state.

•  Deposition is the process where a gas turns directly into a solid without becoming a liquid first.

•  Condensation is the change of state from a solid to a liquid upon heating.

• Freezing is the change of state from a liquid to a solid by removing heat.

• Evaporation occurs when a liquid changes into a gas at temperatures below the boiling point throughout the liquid.

Answer explanation

Sublimation and deposition are phase changes that skip the liquid state entirely. Freezing occurs when a liquid loses heat and becomes a solid. Evaporation is when a liquid turns into a gas at temperatures below its boiling point, often due to individual molecules gaining enough energy to escape the liquid's surface. The statement about condensation is incorrect because condensation is actually the change from a gas to a liquid, not from a solid to a liquid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When a substance goes from the liquid state to the gas state at a temperature below its boiling point, the process is known as __________.

Answer explanation

Evaporation is nature's way of secretly turning liquids into stealthy gas ninjas, escaping into the air without having to reach boiling point hotness! 🌬️💨🥷

Tags

NGSS.MS-PS1-4

Match the following

• Gas to liquid

• 1. Evaporation

• Liquid to gas

• 1. Condensation

• Liquid to gas

• 1. Sublimation

• Liquid to Solid

• 1. Boiling

• Solid to gas

• 1. Freezing

Answer explanation

Did you know that when you see a mothball getting smaller over time, it's sublimating? This means it turns from a solid into a gas without ever becoming liquid. It's like the mothball is slowly vanishing into thin air! This happens because mothballs are made of a substance that can skip the liquid phase under ordinary room conditions, going straight from a solid to a gas. So next time you see one, think, it's not just shrinking—it's sublimating!

Tags

NGSS.MS-PS1-4

A substance that changes from a solid directly to a gas undergoes ​ (a)   , while the reverse process, when a gas becomes a solid without passing through the liquid phase, is called ​ (b)   . If the gas cools down and changes into a liquid, it is known as ​ (c)  

• Sublimation
• Deposition
• Condensation
• Evaporation
• Freezing

Answer explanation

Sublimation (1) is like when dry ice goes straight from being solid to mist without getting wet – it's a direct leap from solid to gas. Deposition (2) is the opposite; it's what happens when frost forms on a window, with water vapor turning into ice without dripping down as liquid. Condensation (3) is the transformation from a gas back into a liquid, just like water droplets on the outside of a cold drink on a hot day – it's the gas cooling down and sticking together again. Each of these processes shows how matter can change between different states under various conditions.

Tags

NGSS.MS-PS1-4