8th Science REVIEW

Front

What is sublimation?

Back

Sublimation is the phase change where a solid gains energy and transforms directly into a gas without becoming a liquid.

Front

What determines the placement of elements like Lithium and Sodium on the periodic table?

Back

Elements are placed in the same GROUP on the periodic table if they have the same number of valence electrons.

Front

What does the Law of Conservation of Matter state?

Back

The Law of Conservation of Matter states that matter cannot be created or destroyed in a chemical reaction; it can only change forms.

Front

How does distance affect gravitational force between two planets?

Back

The farther away two planets are, the less the gravitational force between them.

Front

What happens to the kinetic energy of an object as its height increases?

Back

As the height from which an object is dropped increases, its kinetic energy increases when it falls.

Front

Define condensation.

Back

Condensation is the phase change where a gas loses energy and transforms into a liquid.

Front

What is the difference between a group and a period in the periodic table?

Back

A group is a column in the periodic table where elements have similar properties and the same number of valence electrons, while a period is a row where elements have the same number of electron shells.

Front

What is deposition in terms of phase changes?

Back

Deposition is the phase change where a gas loses energy and transforms directly into a solid.

Front

Explain the concept of kinetic energy.

Back

Kinetic energy is the energy an object possesses due to its motion, which depends on its mass and velocity.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons are the outermost electrons of an atom and are crucial in determining how an atom will bond with others.