review

Jesusa has a big collection of handcrafted earrings. She will transfer her earrings in her newly bought organizer. She grouped the earrings into colors and sizes. What science process was observed based on what Jesusa did?

• Collecting

• Classifying

• Measuring

• Observing

Jobert wanted to know which household substances would prevent the sliced apples from turning brown. He prepared five slices of apples. He applied household products (vinegar, oil, saltwater, and coffee) into four slices of apples and allowed one slice to be left exposed to the air. What is the controlled setup in his experiment?

• Apple exposed to air

• Apples sold in the market

• Apple sliced into five equal parts

• Apples coated with household products

While cleaning the kitchen, Fellyn accidentally mixed vinegar and baking soda. She heard the fizzing sound and noticed the formation of bubbles. She was amazed and started asking questions about what happened. What scientific attitude was described in the situation?

• Critical-mindedness

• Curiosity

• Resourcefulness

• Risk-taking

Which of the following best explains the meaning of the phrase “like dissolves like”?

• Solute and solvent must have the same phase.

• Solvents can dissolve solutes of similar molar mass.

• Nonpolar solvents dissolve in polar and ionic solutes and vice versa.

• Polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes.

Which statement about elements is correct?

• It can be separated into simpler means.

• It is made up of the same type of atom.

• It is composed of two or more atoms.

• It is an example of a homogeneous mixture.

Why does the North Pole experience daytime for almost half a year?

• Because of the 23.5° tilt of Earth away from the sun

• Because of the 23.5° tilt of Earth toward the sun

• Because of the 26° tilt of Earth away from the sun

• Because of the 26° tilt of Earth toward the sun

Why are excess amounts of floating water plants such as water lilies, water hyacinths, and kangkong not good for a lake or pond?

• The bacteria they harbor release toxins that kill other aquatic plants, reducing the production of oxygen in the lower depths of the lake.

• They block off sunlight, reducing the oxygen levels at the lower depths of the lake or pond.

• They decompose and just float there, causing the fishes to drown because they do not have access to open air.

• They do not taste good and are not good for selling in the markets.

What does a person on Earth see during a penumbral lunar eclipse?

• Observers will be thrown into total darkness.

• People will see a slight darkening of the full moon.

• The antumbra will make the moon look slightly darker.

• There is no change.

Among stars, which color is the coolest color?

• Red

• Orange

• Blue

• Yellow

When does an annular solar eclipse occur?

• If the sun, the full moon, and the new moon almost block the sun

• When the moon is too far away to totally cover the sun

• When the moon is too near and is totally covered, showing a corona

• When the penumbra formed by the moon reaches Earth