Chemical Properties and Interactions

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together. An example is Carbon Dioxide (CO2).

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. For Calcium (Ca), the Atomic Number is 20.

Front

How can you identify a pure substance?

Back

A pure substance does not change its composition when boiled. If nothing is left behind after boiling, it indicates a pure substance.

Front

What is the formula to calculate density?

Back

Density = Mass / Volume.

Front

What is the density of a liquid with a mass of 45 g and a volume of 30 mL?

Back

Density = 45 g / 30 mL = 1.5 g/mL.

Front

What is mass?

Back

Mass is the measure of how much matter a substance has.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout.

Front

What is the significance of the Atomic Number in the periodic table?

Back

The Atomic Number determines the position of an element in the periodic table and its chemical properties.

Front

What happens to the properties of a substance when it changes state?

Back

The properties may change, but the substance itself remains the same (e.g., water can be ice, liquid, or vapor).