8th Science STAAR Review - MTZ

Front

What are the properties of elements in Group 18?

Back

They are gaseous at room temperature and chemically stable.

Front

Why does a large rock remain motionless on a flat sidewalk?

Back

The forces acting on the rock are all balanced.

Front

What is the definition of a balanced force?

Back

A balanced force occurs when two forces acting on an object are equal in size and opposite in direction, resulting in no change in motion.

Front

What is the definition of a chemical stability?

Back

Chemical stability refers to the tendency of a substance to maintain its chemical composition and not react with other substances.

Front

What is the significance of having eight valence electrons?

Back

Having eight valence electrons typically indicates that an element is chemically stable and less likely to react.

Front

What is the definition of an unbalanced force?

Back

An unbalanced force occurs when two forces acting on an object are not equal, causing the object to accelerate in the direction of the greater force.

Front

What is the state of matter for elements in Group 18 at room temperature?

Back

They are gaseous.

Front

What happens to an object when all forces acting on it are balanced?

Back

The object remains at rest or continues to move at a constant velocity.

Front

What is the role of the sidewalk in keeping the rock motionless?

Back

The sidewalk exerts an upward force that balances the downward force of gravity on the rock.

Front

What is the definition of a force?

Back

A force is a push or pull that can cause an object to accelerate, change direction, or change shape.