Science Fall Semester Exam

Front

What is the definition of speed in physics?

Back

Speed is the distance traveled per unit of time, typically measured in meters per second (m/s).

Front

What does a speed graph represent?

Back

A speed graph shows how speed changes over time, indicating periods of acceleration, deceleration, and constant speed.

Front

During which time intervals is speed increasing if a speed graph shows increases between 20-30 seconds and 40-60 seconds?

Back

Speed is increasing between 20-30 seconds and 40-60 seconds.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is a substance formed when two or more different elements are chemically bonded together.

Front

How can you determine the density of an object?

Back

Density is calculated by dividing the mass of the object by its volume (Density = Mass/Volume).

Front

If a marble's mass is 2 grams and it displaces 10 mL of water, what is its density?

Back

The density is 0.2 g/mL (Density = 2g / 10mL).

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

Which element has an atomic number of 12?

Back

Magnesium (Mg) has an atomic number of 12.

Front

What is the Scientific Method?

Back

The Scientific Method is a systematic process used by scientists to conduct experiments, involving steps like observation, hypothesis, experimentation, and conclusion.

Front

What is the purpose of the periodic table?

Back

The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties.