SUMMATIVE ASSESSMENT- LESSON 3

What is the definition of a valence electron?

• An electron in the innermost shell of an atom

• An electron in the outermost shell of an atom

• An electron in the nucleus of an atom

• An electron in the middle shell of an atom

How many valence electrons does a carbon atom have?

• 2

• 4

• 6

• 8

What happens during a chemical reaction?

• Atoms are created

• Atoms are destroyed

• Atoms are rearranged

• Atoms remain unchanged

Tags

NGSS.MS-PS1-5

What are hydrocarbons?

• Compounds made of hydrogen and oxygen

• Compounds made of carbon and oxygen

• Compounds made of hydrogen and carbon

• Compounds made of carbon and nitrogen

Which of the following is an example of a hydrocarbon?

• Water (H2O)

• Carbon dioxide (CO2)

• Methane (CH4)

• Nitrogen gas (N2)

How is the number of atoms on the left side of a chemical equation related to the number of atoms on the right side?

• They are always equal

• They are always different

• They can be equal or different depending on the reaction

• There is no relationship between the two

Tags

NGSS.MS-PS1-5

How many carbon atoms are present in the hydrocarbon molecule of butane (C₄H₁₀)?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

What is the total number of atoms on the left side of a balanced chemical equation for the reaction 2H2 + O2 → 2H2O?

• 5

• 6

• 7

• 8

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What is the atomic number of an element?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The number of electrons in the nucleus

• The number of valence electrons in the outermost shell

Which type of bond involves the sharing of electrons between atoms?

• Ionic bond

• Covalent bond

• Metallic bond

• Hydrogen bond