Understanding Matter Components

What is an element?

• An element is a fundamental substance that consists of only one type of atom.

• A compound formed by chemical reactions.

• A type of molecule that contains multiple elements.

• A mixture of different types of atoms.

Which of the following is a compound?

• Water (H2O)

• Sodium Chloride (NaCl)

• Oxygen (O2)

• Carbon Dioxide (CO2)

What does the atomic number represent?

• The total mass of an atom.

• The number of neutrons in an atom.

• The number of protons in an atom.

• The number of electrons in an atom.

What is the mass number of an atom?

• The mass number is the number of electrons in an atom.

• The mass number is the sum of protons and neutrons in an atom.

• The mass number is the average weight of an atom in grams.

• The mass number is the total number of atoms in a molecule.

Which of the following is a mixture?

• Air

• Salt

• Sugar

• Water

How do you read the periodic table?

• Identify elements by their size and shape on the table.

• Read the periodic table by memorizing the colors of the elements.

• Understand the periodic table by focusing only on the first row.

• Read the periodic table by identifying elements by their symbols and atomic numbers, and understanding their arrangement in periods and groups.

What is the difference between isotopes?

• Isotopes differ in the number of protons and electrons.

• Isotopes have the same atomic mass but different chemical properties.

• Isotopes are elements that have different numbers of electrons.

• Isotopes differ in the number of neutrons and atomic mass.

Which element has the atomic number 6?

• Nitrogen

• Hydrogen

• Carbon

• Oxygen

What is the formula for calculating mass number?

• Mass number = Number of protons x Number of neutrons

• Mass number = Number of electrons + Number of neutrons

• Mass number = Number of protons + Number of neutrons

• Mass number = Number of protons - Number of neutrons

Which of the following statements is true about compounds?

• Compounds can be separated by physical means.

• Compounds are always gases at room temperature.

• Compounds are made up of only one element.

• Compounds are formed from two or more elements chemically bonded together.