Sc.8.P.8.8

Carbon dioxide, has the chemical formula CO₂. how many atoms of each element are in this compound? (SC.8.P.8.5)

• 2 carbon and 2 oxygen

• 1 carbon and 1 oxygen

• 2 carbon and 1 oxygen

• 1 carbon and 2 oxygen

Tags

NGSS.MS-PS1-1

What can be concluded about the structure of water? (SC.8.P.8.5)

• It is an atom made up of two elements.

• It is an atom made up of three elements.

• It is a molecule made up of two elements.

• It is a molecule made up of three elements.

Tags

NGSS.MS-PS1-1

Which of the above figures BEST represents a pure substance? (SC.8.P.8.9)

• Boxes W& X

• Boxes X & Z

• Boxes Y & W

• Boxes Z & W

Tags

NGSS.MS-PS1-1

Which is NOT a characteristic of mixtures? (SC.8.P.8.9)

• A A mixture can consist of a single element.

• A mixture can be a solution.

• A mixture can be separated by physical means.

• A mixture must be homogeneous or heterogeneous

When sugar is dissolved in water, the resulting solution is classified as a: (SC.8.P.8.9)

• homogeneous mixture

• homogeneous compound

• heterogeneous mixture

• heterogeneous compound

Two grams (2g) of potassium chloride are completely dissolved in a beaker of water. What part of this solution is the potassium chloride classified as? (SC.8.P.8.9)

• an element

• a solute

• a solvent

• a solution

What type of mixture is represented by X? (SC.8.P.8.9)

• a mixture of compounds

• a heterogeneous mixture

• a mixture of elements

• a homogeneous mixture

A mixture of crystals of salt and sugar is added to water and stirred until all solids have dissolved. What are the solutes in the homogeneous solution mixture?(SC.8.P.8.9)

• the solutes are salt crystals and water

• the solutes are sugar crystals and water

• the solutes are sugar and salt crystals

• the solute is water

Salad dressing such as Italian dressing is classified as: (SC.8.P.8.9)

• an element

• a homogeneous mixture

• a compound

• a heterogeneous mixture

A reaction between an acid and a base is called neutralization. What is the resulting product of this neutralization? (SC.8.P.8.8)

• An weak acid

• A weak base

• A salt

• A solution