Understanding Matter and Chemical Reactions

Which of the following is a homogeneous mixture?

• Salad

• Saltwater

• Sand and iron filings

• Oil and water

Tags

TEKS.SCI.8.6A

Which of the following best describes the role of the periodic table in understanding chemical reactions?

• It lists all known compounds.

• It helps identify the atoms involved in reactions.

• It shows the phases of matter.

• It provides the history of elements.

Tags

TEKS.SCI.8.6B

What property of water allows insects to walk on its surface?

• Adhesion

• Cohesion

• Surface tension

• Viscosity

Tags

TEKS.SCI.8.6C

Explain how cohesion and adhesion contribute to the transport of water in plants.

• Cohesion allows water to stick to plant roots, while adhesion pulls water up the stem.

• Cohesion keeps water molecules together, while adhesion helps them stick to plant tissues.

• Cohesion breaks water molecules apart, while adhesion pushes them through the plant.

• Cohesion and adhesion have no role in water transport in plants.

Tags

TEKS.SCI.8.6C

Which of the following substances is considered a base?

• Lemon juice

• Vinegar

• Baking soda

• Distilled water

Tags

TEKS.SCI.8.6D

Compare the pH levels of acids and bases relative to water.

• Acids have a pH greater than 7, while bases have a pH less than 7.

• Acids and bases both have a pH of 7.

• Acids have a pH less than 7, while bases have a pH greater than 7.

• Acids and bases have no relation to pH.

Tags

TEKS.SCI.8.6D

In a chemical reaction, the mass of the reactants is 50 grams. What will be the mass of the products?

• 25 grams

• 50 grams

• 75 grams

• 100 grams

Tags

TEKS.SCI.8.6E

How does the conservation of mass relate to the rearrangement of atoms in the chemical equation for photosynthesis?

• Atoms are destroyed and created during photosynthesis.

• The number of each type of atom is the same on both sides of the equation.

• Mass is lost as energy during photosynthesis.

• Atoms are only rearranged in the reactants.

Tags

TEKS.SCI.8.6E

Identify which are the products and reactants

a

b

reactants

products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

two or more different types of atoms combined together

• atom

• element

• electron

• compound

Tags

NGSS.MS-PS1-1