ACT Science Practice

Front

What is potential energy (PE) and how is it calculated?

Back

Potential energy (PE) is the energy stored in an object due to its position or configuration. It is calculated using the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is the height above a reference point.

Front

How does molecular mass affect viscosity?

Back

Molecular mass can influence viscosity, but it is not the only factor. Different substances with the same molecular mass can have different viscosities due to their molecular structure and interactions.

Front

What is the relationship between heat released by food and water temperature change?

Back

The heat released by food is directly related to the change in water temperature; as more heat is released, the temperature of the water increases.

Front

What is molecular mass and how is it determined?

Back

Molecular mass is the mass of a molecule, calculated as the sum of the atomic masses of all atoms in the molecule. It is typically measured in atomic mass units (amu).

Front

What is the significance of absorption rates in pigments?

Back

Absorption rates indicate how much light a pigment can absorb at specific wavelengths, which is crucial for processes like photosynthesis.

Front

What factors can affect the potential energy of an object?

Back

Factors affecting potential energy include the object's mass, its height above a reference point, and the gravitational field strength.

Front

What is the difference between kinetic energy and potential energy?

Back

Kinetic energy is the energy of motion, while potential energy is stored energy based on an object's position or state.

Front

How do temperature changes relate to energy transfer in physical systems?

Back

Temperature changes in a system indicate energy transfer; when energy is added to a system, temperature typically increases, and when energy is removed, temperature decreases.

Front

What is the role of chlorophyll in photosynthesis?

Back

Chlorophyll is a pigment that absorbs light energy, primarily in the blue and red wavelengths, which is essential for photosynthesis.

Front

What is viscosity and how is it measured?

Back

Viscosity is a measure of a fluid's resistance to flow. It is measured using various methods, including viscometers, and is expressed in units like Pascal-seconds (Pa·s).