9 - Chemistry review #2

What is the definition of matter in chemistry?

• A process where atoms rearrange to form a new substance

• A substance with a definite volume but no fixed shape

• Anything that has mass and occupies space

• A type of mixture that can be separated by chemical means

Which of the following is an example of a pure substance?

• Salt water

• Air

• Table salt (NaCl)

• Soil

What distinguishes a mixture from a pure substance?

• Mixtures can be separated into their components by chemical means

• Mixtures have a definite composition

• Mixtures retain the properties of their individual substances

• Mixtures cannot be separated into their components

Which of the following is NOT an example of an element?

• Neon (Ne)

• Water (H₂O)

• Carbon (C)

• Sodium (Na)

What is a compound in chemistry?

• A blend of two or more elements that can be separated by physical means

• A single element that can exist in different forms

• A substance made up of two or more elements, chemically combined

• A type of element that can be broken down into simpler substances

What occurs during a chemical reaction?

• A pure substance changes its physical state

• The atoms of one or more substances are rearranged to form different substances

• A mixture is separated into its individual components

• Elements are physically combined to form a mixture

What is a Group in the context of the periodic table?

• A horizontal row of elements

• A vertical column of elements

• A list of elements with similar properties

• A classification based on atomic mass

Which of the following is NOT an example of a Group in the periodic table?

• Alkali metals

• Noble gases

• Halogens

• Lanthanides

What does the term 'Period' refer to in the periodic table?

• A vertical column of elements

• A group of elements with no electrons in common

• A horizontal row of elements

• A classification based on reactivity

What is a valence shell?

• The innermost shell of an atom

• The shell containing the least number of electrons

• The outermost occupied energy shell of an atom

• The shell used for chemical bonding