Correction Week 8 LCP Review

Multiple Choice

Which of the following is a correct classification of matter?

• Element and Compound

• Homogeneous and Heterogeneous Mixtures

• Pure Substance and Mixture

• Solid and Liquid

Multiple Select

Which of the following is an example of a pure substance? Choose all that apply

• Salt (NaCl)

• Air

• Milk

• Pure Water (H2O)

Multiple Select

Which of the following are classified as pure substances? choose all that apply

• Element

• Compound

• Homogeneous mixture

• Heterogeneous mixture

Open Ended

Explain the difference between a homogeneous mixture and a heterogeneous mixture, providing an example of each.

Multiple Choice

Which student correctly classified all the substances in the table?

• Camila

• Mateo

• Olivia

• Liam

Multiple Choice

Which of the models show elements only?

• 5

• 6

• 5 and 6

• 4 and 5

Multiple Choice

Which property of water allows insects to walk on its surface as shown in the images?

• Cohesion

• Adhesion

• Surface tension

• Evaporation

Drag and Drop

Of all the liquids, water has the highest surface ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

tension

frozen

groundwater

Multiple Choice

How is this lizard able to run across water?

• Capillary Action

• The lizard is really light

• The water is a little frozen

• Surface Tension

Multiple Choice

Raindrops stick to the window glass during a rainstorm. This is an example of:

• adhesion
• capillary action
• surface tension
• cohesion

Multiple Choice

A person can skip rocks because water molecules pull on each other across the top of the water. This is also why water can bulge over the top of a penny. This property is know as-

• adhesion

• capillary action

• surface tension

• transparency

Multiple Select

Which of the following statements about cohesion and adhesion are correct? Choose 3 answer choices.

• Cohesion is the attraction between water molecules.

• Adhesion helps water stick to other surfaces.

• Cohesion is responsible for surface tension in water.

• Adhesion causes water to evaporate quickly.

Open Ended

Explain how both cohesion and adhesion contribute to the movement of water from the roots to the leaves in plants.

Multiple Choice

Reference the photo of water droplets hanging from pine needles. Which statement correctly describes the forces acting on the droplets of water?

• Adhesion and cohesion cause the water molecules to stick together, forming a droplet. Adhesion causes the water to stick to the pine needle, preventing droplets from falling off.

• Adhesion causes the water molecules to stick together, forming a droplet. Cohesion causes the water to stick to the pine needle, preventing droplets from falling off.

• Cohesion causes the water molecules to stick together, forming a droplet. Adhesion causes the water to stick to the pine needle, preventing droplets from falling off.

• Cohesion causes the water molecules to stick together, forming a droplet. Adhesion and cohesion cause the water to stick to the pine needle, preventing droplets from falling off.

Multiple Choice

Water is transported against gravity from the roots of a tree up into the leaves. The water travels up the tree in tubes called xylem. Which of the following description best explains transport in plants?

• Adhesion keeps the water molecules together. Cohesion pulls the water molecules to other molecules such as the xylem.

• Cohesion keeps the water molecules together. Adhesion pulls the water molecules to other molecules such as the xylem.

• Cohesion keeps the water molecules together. Surface tension pulls the water molecules to other molecules such the xylem.

• Surface tension keeps the water molecules together. Adhesion pulls the water molecules to other molecules such the xylem.

Multiple Choice

Which of the following is a property of bases but not acids?

• Taste sour

• Turn litmus paper red

• Feel slippery

• Include fruit juices

Multiple Choice

Which of the following pH values would be the weakest acid?

• 1

• 3

• 5

• 6

Multiple Choice

Milk is a very weak acid. What might its pH value be?

• 6

• 7

• 4

• 12

Multiple Select

Which of the following substances are considered acids according to the pH scale shown?

• Lemon juice

• Baking soda

• Stomach acid

• Ammonia solution

Multiple Choice

Which statement based on the pH scale is NOT correct?

• Black coffee is more acidic than lemon juice.

• Black coffee is more acidic than seawater.

• Lemon juice and black coffee are acids.

• Seawater and baking soda are bases.

Multiple Choice

What is the total number of hydrogen atoms in 5(NH4)2O?

• 10

• 20

• 40

• 8

Multiple Choice

Which equation has both molybdenum and lead in it?

• A) H3PO4 + 12(NH4)2MoO4 + 21HNO3 → (NH4)3PO4(MoO3)12 + 21NH4NO3 + 12H2O

• B) HCl + H2S + Na2MoO4 → H2O + NaCl + MoS3

• C) HNO3 + PbO2 + Mn(NO3)2 → H2O + Pb(NO3)2 + HMnO4

• D) HNO3 + PbO2 + MoS2 → H2O + Pb(NO3)2 + PbSO4 + H2MoO4

Open Ended

Explain how the process of photosynthesis demonstrates the law of conservation of mass using the chemical equation and diagram provided.

Multiple Choice

Does this equation violate the principle of the conservation of mass? Why or why not?

• This equation does not violate the law of conservation of mass because the number of atoms of each kind are the same in the reactants and the products.

• This equation does not violate the law of conservation of mass because even though the total number of atoms changes, it is an open system.

• This equation violates the law of conservation of mass because the molecules in the reactants are different from the molecules in the products.

• This equation violates the law of conservation of mass because the number of atoms of each kind are the same in the reactants and the products.

Multiple Choice

What are the two main categories into which matter can be classified?

• Pure Substance and Mixture

• Element and Compound

• Solid and Liquid

• Homogeneous and Heterogeneous