CBA Review

Which plant adaptation is most advantageous for reaching sunlight in a dense forest?

• Plant A: develops broad leaves

• Plant B: grows rapidly to surpass other plants

• Plant C: produces vibrant red flowers

• Plant D: has deep roots for water absorption

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1

Sodium sulfate(Na₂SO₄) is used to produce many products. Which elements are represented in the formula?

• N, A, SO

• Na, S, O

• NAS, O

Tags

NGSS.MS-PS1-1

Na₂SO₄

How many atoms of each element are present in the formula?

• Na=2

  S=1

  O=4

• Na=2

  S=4

  O=4

• N=1

  A=2

  S=1

  O=4

• Na=1

  S=2

  O=4

Tags

NGSS.MS-PS1-1

The names and chemical formulas for four substances are shown below. Which substance listed is made up of the most atoms?

Carbonic Acid = H₂CO₃

Nitric Acid = HNO₃

Phosphoric Acid = H₃PO₄

Sulfuric Acid = H₂SO₄

• Carbonic Acid

• Nitric Acid

• Phosphoric Acid

• Sulfuric Acid

Tags

NGSS.MS-PS1-1

Which substances have the same number of carbon atoms?

Substance 1 = C₂H₆O

Substance 2 = C₈H₁₈

Substance 3 = CH₃CH₂Br

Substance 4 = C₄H₁₀O

• substances 1 and 2

• substances 2, 3, and 4

• substances 2 and 3 only

• substances 1 and 3

Tags

NGSS.MS-PS1-1

Photosynthesis is an example of a

• physical change
• chemical change

Tags

NGSS.MS-LS1-6

NGSS.MS-PS1-2

NGSS.MS-LS1-7

A student is creating a model of calcium phosphate, Ca₃(PO₄)₂, using colored beads. Calcium atoms are represented by red beads, phosphorus atoms by orange beads, and oxygen atoms by purple beads. What combination of beads should the student use for the model?

• 3 red, 2 orange, and 8 purple

• 3 red, 1 orange, and 4 purple

• 6 red, 4 orange, and 16 purple

• 3 red, 2 orange, and 4 purple

Tags

NGSS.MS-PS1-1

Consider the reaction between calcium carbonate, CaCO₃, and sulfuric acid, H₂SO₄. The chemical equation is given below, along with the masses of some reactants and products. Determine the mass of sulfuric acid used in the reaction.

CaCO₃ + H₂SO₄ -------> CaSO₄ + CO₂ + H₂O

100g ? 136g 44g 18g

• 98g

• 97g

• 99g

• 96g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

When solutions of BaCl₂ and Na₂SO₄ are mixed, a solid precipitate of BaSO₄ forms. The balanced chemical equation is:

BaCl₂ + Na₂SO₄ -------> BaSO₄ + 2 NaCl

What happens to the total mass during this reaction?

• the mass increases

• the mass decreases

• the mass remains constant

• the mass first increases and then decreases

Tags

NGSS.MS-PS1-5

During photosynthesis, plants transform carbon dioxide and water into glucose and oxygen. Which statement best explains the principle of mass conservation in this process?

• The mass of glucose and oxygen produced is less than the mass of carbon dioxide and water used, indicating a loss of mass.

• The mass of carbon dioxide and water consumed is equal to the mass of glucose and oxygen produced, showing that atoms are rearranged but not lost.

• The mass of oxygen released is greater than the mass of glucose formed, suggesting an increase in mass.

• In photosynthesis, carbon dioxide is absorbed, leading to a decrease in total mass over time.

Tags

NGSS.MS-LS1-6

NGSS.MS-PS1-5