Combinations

What is a compound?

• A substance that is made by the chemical combination of two or more elements.

• A substance that is made by heating a single element.

• A substance that is made by the physical collection of two or more elements.

• A mixture that is made by heating a single element in a vacuum.

What is the combination of two or more substances that results in a chemical reaction?

• A mixture

• A compound

• A solution

• A suspension

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a combination reaction?

• @@ ext{C} + ext{O}_2 ightarrow ext{CO}_2@@

• @@ ext{H}_2 ext{O} ightarrow ext{H}_2 + ext{O}_2@@

• @@ ext{NaCl} ightarrow ext{Na} + ext{Cl}_2@@

• @@ ext{CaCO}_3 ightarrow ext{CaO} + ext{CO}_2@@

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a combination reaction, two or more reactants combine to form:

• A single product

• Multiple products

• No product

• A catalyst

Tags

NGSS.MS-PS1-5

Which of the following best describes a combination in the context of chemical bonding?

• The physical mixing of substances without chemical bonding

• The chemical bonding of atoms to form molecules

• The separation of molecules into individual atoms

• The dissolution of a solid into a liquid

Tags

NGSS.MS-PS1-5

What is the result of combining hydrogen and oxygen in a chemical reaction?

• Water

• Hydrogen peroxide

• Ozone

• Methane

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT a characteristic of a combination reaction?

• Formation of a single product

• Release of energy

• Involves only one reactant

• Involves two or more reactants

In the combination of sodium and chlorine, what is the product formed?

• Sodium chloride

• Sodium chlorate

• Sodium chlorite

• Sodium perchlorate

Tags

NGSS.MS-PS1-5

Which of the following combinations results in the formation of a covalent bond?

• Hydrogen and oxygen

• Sodium and chlorine

• Magnesium and oxygen

• Iron and sulfur

What is the main characteristic of a combination reaction in terms of energy?

• It always absorbs energy

• It always releases energy

• It can either absorb or release energy

• It does not involve energy change

Tags

NGSS.HS-PS1-4