Elements & Compounds

Open Ended

What happens to electrons when a covalent bond is formed?

Multiple Choice

Which of the following best describes a compound?

• A substance made of only one type of atom

• A mixture of different substances

• A substance formed by chemically combining two or more elements

• A physical blend of elements

Open Ended

Why is it important to understand the difference between elements and compounds in science?

Multiple Choice

Which of the following best describes an element as shown in the periodic table?

• A substance made of two or more types of atoms

• A pure substance that consists entirely of one type of atom

• A mixture of different compounds

• A substance that cannot be found on the periodic table

Open Ended

Explain how the atomic number and atomic mass of an atom are determined, and why these are important for understanding elements.

Multiple Choice

Which of the following best explains why water (H2O) is a liquid even though hydrogen and oxygen are gases?

• Water is a mixture, not a compound.

• The properties of a compound are different from those of the elements that form it.

• Hydrogen and oxygen lose their properties when combined physically.

• Water contains more oxygen than hydrogen.

Fill in the Blanks

A definite proportion in a compound means the ratio of atoms is always the

.

Multiple Choice

Which of the following statements about compounds is correct?

• Compounds are made of only one type of atom.

• Compounds are formed by the chemical combination of two or more elements in a definite proportion.

• Compounds have the same properties as the elements that form them.

• Compounds can be separated by physical means.

Open Ended

Describe what happens to electrons when an ionic bond is formed between two atoms.

Multiple Choice

Which part of the periodic table contains non-metals?

• Left hand side

• Middle

• Right hand side

• Bottom

Multiple Choice

Which of the following statements about the formation of ions is correct?

• Metals gain electrons to form positive ions.

• Non-metals lose electrons to form negative ions.

• Metals lose electrons to form positive ions.

• Non-metals gain electrons to form positive ions.

Fill in the Blanks

Sodium loses an electron to become a

ion.

Multiple Choice

How many electrons can occupy the first shell and the other shells of an atom?

• First shell: 2, Other shells: 8

• First shell: 8, Other shells: 2

• First shell: 4, Other shells: 6

• First shell: 6, Other shells: 4

Multiple Select

Which of the following statements about covalent bonds is/are correct?

• Covalent bonds involve sharing of electrons.

• Covalent bonds are formed only between metals.

• Electrons involved in covalent bonds are found in the outer shells.

• Each atom contributes one electron to a covalent bond.

Open Ended

Explain how covalent bonds are formed between atoms, using examples from the molecules shown.

Fill in the Blanks

Each fluorine atom has

electrons in its outer shell.

Multiple Choice

Would you like to know more about how substances are classified as elements or compounds?

• Yes, I want to learn more about classification.

• No, I feel confident about the topic.

• I have some questions about elements.

• I have some questions about compounds.

Open Ended

Reflecting on today's lesson, what is one key difference between an element and a compound that you learned?