IPC Semester 1 Exam

Front

What is acceleration?

Back

Acceleration is the rate of change of velocity of an object. It is calculated by the formula: a = (final velocity - initial velocity) / time.

Front

How do you calculate acceleration?

Back

Acceleration (a) = (final velocity (v_f) - initial velocity (v_i)) / time (t). For example, if a roller coaster accelerates from 6.0 m/s to 70 m/s in 4 seconds, a = (70 m/s - 6.0 m/s) / 4 s = 16 m/s².

Front

What is velocity?

Back

Velocity is the speed of an object in a specific direction. It is a vector quantity, meaning it has both magnitude and direction.

Front

What is the significance of having 8 electrons in the outer shell?

Back

Most elements strive to have 8 electrons in their outer shell to achieve stability, following the octet rule. This configuration is often associated with noble gases.

Front

What determines whether an object will sink or float in water?

Back

An object will sink if its density is greater than the density of water (1 g/mL) and will float if its density is less than that of water.

Front

What is density?

Back

Density is the mass of an object divided by its volume, typically expressed in g/mL or kg/m³. It indicates how compact the matter in an object is.

Front

What is a chemical change?

Back

A chemical change occurs when substances combine or break apart to form new substances. This often involves a change in energy and can produce gas, light, or a precipitate.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the formula for calculating density?

Back

Density (d) = mass (m) / volume (V). For example, if an object has a mass of 36 g and a volume of 10 mL, its density is 36 g/10 mL = 3.6 g/mL.