States of Matter

Front

A liquid...

Back

takes the shape of its container

Answer explanation

A liquid takes the shape of its container, adapting to the space available. This is due to the arrangement of its molecules, which are closer together than in gases but not as tightly packed as in solids.

Front

A gas...

Back

is usually invisible

Answer explanation

Gases are typically invisible to the naked eye, unlike liquids and solids which can be seen. While gases do have mass, the correct choice highlights their common characteristic of being usually invisible.

Front

A solid...

Back

has very tightly packed molecules

Answer explanation

A solid has very tightly packed molecules, which gives it a definite shape and volume. Unlike liquids, solids do not take the shape of their container, and they do not always start as liquids.

Front

The three states of matter that we have studied are...

Back

Solids, liquids, gases

Answer explanation

The three states of matter are solids, liquids, and gases. This choice correctly identifies the fundamental states, while the other options include incorrect terms or combinations.

Front

All matter...

Back

takes up space and has mass

Answer explanation

The correct choice, 'takes up space and has mass', defines all matter. While matter can be made of H2O and can take the shape of containers, these are not universal characteristics of all matter.

Front

Which state of matter has a definite shape?

Back

solid

Answer explanation

A solid has a definite shape because its particles are closely packed together in a fixed arrangement, allowing it to maintain its shape. In contrast, liquids and gases do not have a definite shape.

Front

What is happening when an ice cream changes from a solid to a liquid?

Back

melting

Answer explanation

When ice cream changes from a solid to a liquid, it is undergoing melting. This process occurs when heat is applied, causing the solid structure to break down and transition into a liquid state.

Front

The state of matter that has no definite size or shape

Back

gas

Answer explanation

A gas has no definite size or shape, expanding to fill its container. In contrast, solids have a fixed shape and volume, while liquids have a definite volume but take the shape of their container.

Front

Which has the greatest distance between molecules?

Back

gas

Answer explanation

Gases have the greatest distance between molecules compared to liquids and solids. In gases, molecules are far apart and move freely, while in solids, they are tightly packed, and in liquids, they are closer than in gases but not as close as in solids.

Front

The basic unit of matter is...

Back

an atom

Answer explanation

The basic unit of matter is an atom, which consists of protons, neutrons, and electrons. Molecules are made up of two or more atoms, and elements are pure substances consisting of only one type of atom.