What is a combustion reaction?

• A reaction that occurs when a substance combines with oxygen, releasing energy in the form of light or heat.

• A reaction that absorbs energy and does not involve oxygen.

• A reaction that occurs when two substances react without oxygen.

• A reaction that produces only gases without any energy release.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What is a synthesis reaction?

• A reaction where a single reactant breaks down into two or more products.

• A type of reaction where two or more reactants combine to form a single product.

• A reaction that involves the exchange of ions between two compounds.

• A process where energy is absorbed without any chemical change.

What are intermolecular forces?

• Forces that occur between molecules, influencing their physical properties such as boiling and melting points.

• Forces that occur within a molecule, affecting its chemical properties.

• Forces that are only present in gases and not in liquids or solids.

• Forces that are responsible for the formation of ionic bonds.

Tags

NGSS.HS-PS1-3

What do the coefficients in a chemical equation indicate?

• They indicate the temperature at which the reaction occurs.

• They indicate the pressure of the reaction system.

• They indicate the number of molecules of each reactant used and the number of molecules of each product made.

• They indicate the type of reaction taking place.

Which of the following is not an intermolecular force?

• Hydrogen bonding

• Dipole-dipole interaction

• Covalent bonding

• London dispersion forces

What is the role of energy in chemical reactions?

• Energy is not involved in chemical reactions.

• Energy is only required to form products.

• Energy is required to break bonds in reactants and is released when new bonds form in products.

• Energy has no effect on reaction rates or equilibrium.

Tags

NGSS.HS-PS1-4

What is hydrogen bonding?

• A weak attraction between nonpolar molecules.

• A strong type of dipole-dipole attraction between molecules containing hydrogen bonded to highly electronegative atoms like nitrogen, oxygen, or fluorine.

• An ionic bond formed between hydrogen and oxygen.

• A covalent bond between hydrogen and carbon.

How do intermolecular forces affect boiling and melting points?

• Stronger intermolecular forces result in lower boiling and melting points, as less energy is needed to overcome these forces.

• Stronger intermolecular forces result in higher boiling and melting points, as more energy is needed to overcome these forces.

• Intermolecular forces have no effect on boiling and melting points.

• Weaker intermolecular forces result in higher boiling and melting points, as more energy is needed to overcome these forces.

Tags

NGSS.HS-PS1-3

What are London dispersion forces?

• Weak intermolecular forces that arise from temporary shifts in electron density in molecules.

• Strong forces that hold atoms together in a molecule.

• Attractive forces between molecules that are always present.

• Repulsive forces that occur between charged particles.

Tags

NGSS.HS-PS2-6

What can be determined from the chemical formula C6H12O6?

• The number of atoms of each element in a glucose molecule.

• The molecular weight of glucose.

• The boiling point of glucose.

• The solubility of glucose in water.