8th Grade Unit 1 Review: Matter & Chemical Reactions

Which of the following is an example of a compound?

• Gold (Au)

• Iron (Fe)

Tags

NGSS.MS-PS1-1

• It will sink to the bottom.

• It will float on the surface.

• It will dissolve in the water.

• It will stay suspended in the middle.

Which property allows water to form droplets on a leaf?

• Adhesion

• Cohesion

• Surface tension

• Density

Which of the following has a pH less than 7?

• Pure water

• Vinegar

• Baking soda solution

• Soap

• 1

• 2

• 4

• 6

Tags

NGSS.MS-PS1-1

Which of the following best describes a homogeneous mixture?

• A mixture where the components are evenly distributed

• A mixture where the components are easily seen and separated

• A pure element

• A chemical compound

Using the periodic table, which element is represented by the symbol "Na"?

• Nitrogen

• Sodium

• Neon

• Nickel

Which scenario best demonstrates adhesion?

• Water molecules sticking to each other

• Water climbing up a paper towel

• Water forming a dome on a penny

• Water freezing into ice

A student tests the pH of four solutions. Which solution is most likely a base?

• Solution A: pH 3

• Solution B: pH 7

• Solution C: pH 9

• Solution D: pH 6

Which statement best explains the law of conservation of mass in a chemical reaction?

• The total mass of reactants equals the total mass of products

• Mass is lost as heat during reactions

• Atoms are destroyed in chemical reactions

• New atoms are created in products

Tags

NGSS.MS-PS1-5