Chemical Elements and Properties

The video tutorial discusses the properties of matter, focusing on physical and chemical properties. It explains how matter is classified into mixtures and pure substances, with further categorization into elements and compounds. The tutorial also covers the creation of chemical formulas and the concept of diatomic molecules, providing examples and explanations for each topic.

Which of the following is a physical property of matter?

• Reactivity with acid

• Color

• Ability to rust

• Flammability

What happens to iron when it reacts with water and oxygen?

• It melts

• It forms a new substance called rust

• It evaporates

• It remains unchanged

How can mixtures be described?

• They are chemically combined

• They can be separated into original substances

• They have a fixed ratio of components

• They are always homogeneous

What is a pure substance that consists of only one kind of atom called?

• Element

• Mixture

• Compound

• Solution

How many naturally occurring elements are there approximately?

• 120

• 95

• 75

• 50

What is the chemical formula for water?

• O2H

• H2O

• HO2

• H2

What is the significance of the first letter in a chemical formula?

• It is always a symbol

• It is always capitalized

• It is always lowercase

• It is always a number

Which of the following elements forms diatomic molecules?

• Argon

• Helium

• Neon

• Oxygen

What is the Latin-derived symbol for gold?

• Go

• Ag

• Au

• Gd

Which element forms groups of four when combining with itself?

• Oxygen

• Nitrogen

• Phosphorus

• Sulfur