Unit 1 Test Physical Science Part 1

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

How is density defined?

Back

Density is defined as mass per unit volume, typically expressed in grams per cubic centimeter (g/cm³).

Front

What happens to the density of a substance when it is divided into smaller pieces?

Back

The density remains the same regardless of the size of the pieces, as long as the mass and volume of the pieces are proportional.

Front

What is the difference between an open system and a closed system in science?

Back

An open system can exchange matter and energy with its surroundings, while a closed system can exchange energy but not matter.

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is the relationship between density and buoyancy?

Back

An object will float in a fluid if it is less dense than the fluid, and sink if it is more dense.

Front

What is the formula for calculating density?

Back

Density = Mass / Volume.

Front

What is an example of a closed system?

Back

A sealed container where a chemical reaction occurs without any substances escaping is an example of a closed system.

Front

What is the significance of protons in determining an element's properties?

Back

The number of protons determines the element's identity and its position on the periodic table.

Front

How can you determine if one substance is denser than another?

Back

By comparing their masses and volumes; the substance with the greater mass for the same volume is denser.