Molecules and Compounds

Tara and Andrew are discussing the concept of a chemical bond. Tara asks Andrew, 'What is a chemical bond?'

• A chemical bond is a type of physical bond between two atoms.

• A chemical bond is a force of attraction between two atoms that holds them together in a molecule.

• A chemical bond is a bond formed between two molecules.

• A chemical bond is a bond that only occurs in organic compounds.

Aumi, Andrew, and Rica are discussing the types of chemical bonds found in everyday substances. They want to know the two main types of chemical bonds. Can you help them?

• polar bonds and nonpolar bonds

• hydrogen bonds and metallic bonds

• ionic bonds and metallic bonds

• ionic bonds and covalent bonds

Grace and Andrew are in a chemistry class. Their teacher explains that table salt (NaCl) is an example of an ionic compound. How did she explain that ionic compounds like NaCl are formed?

• She said that ionic compounds are formed through the sharing of electrons between atoms.

• She said that ionic compounds are formed through the transfer of electrons between atoms.

• She said that ionic compounds are formed through the covalent bonding of atoms.

• She said that ionic compounds are formed through the absorption of electrons by atoms.

Tags

NGSS.HS-PS1-3

Aumi and Tara are in a science class. Their teacher explains that when an atom or molecule loses or gains electrons, it becomes something else. What is this called?

• It is called a type of gas that is commonly found in the atmosphere.

• It is called an ion, which has a net electrical charge due to the loss or gain of electrons.

• It is called a type of chemical bond formed between two atoms.

• It is called a subatomic particle that carries a positive charge.

Tags

NGSS.HS-PS1-1

Grace and Tara are discussing the formation of a covalent bond. What is a covalent bond in the context of their discussion?

• A covalent bond is a chemical bond that involves the repulsion of like charges between atoms.

• A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.

• A covalent bond is a chemical bond that involves the attraction of opposite charges between atoms.

• A covalent bond is a chemical bond that involves the transfer of electron pairs between atoms.

Tags

NGSS.HS-PS1-1

Andrew and Rica are discussing the difference between a polar covalent bond and a nonpolar covalent bond in a water molecule. What is the main difference between these two types of bonds?

• The difference is in the type of atoms involved.

• The difference is in the electronegativity difference and charge separation.

• The difference is in the strength of the bond.

• The difference is in the number of electrons shared.

Andrew and Grace are studying the molecular structure of water. What is the molecular structure of water that they will find?

• bent or V-shaped

  (Mickey Mouse)

• planar

• tetrahedral

• linear

Andrew is studying the atomic structure of different elements. He comes across carbon and wants to know its atomic structure. What is the atomic structure of carbon?

• 6 protons, 6 neutrons, and 6 electrons

• 5 protons, 5 neutrons, and 5 electrons

• 7 protons, 7 neutrons, and 7 electrons

• 6 protons, 6 neutrons, and 5 electrons

Andrew, Aumi, Rica, and Tara are studying chemistry together. They are discussing the atomic structure of oxygen. What is the correct atomic structure of oxygen?

• 8 protons, 8 neutrons, and 8 electrons

• 6 protons, 6 neutrons, and 6 electrons

• 10 protons, 10 neutrons, and 10 electrons

• 4 protons, 4 neutrons, and 4 electrons

Grace and Rica are studying chemistry together. They come across a question about nitrogen and its valence electrons. How many valence electrons does nitrogen have (Remember valence electrons are the electrons on the last energy level)?

• 5

• 10

• 8

• 2

Tags

NGSS.HS-PS1-1