Mock GL Chemistry Year 8

At 7.8 degrees Celsius, water is a:

• Solid

• Liquid

• Gas

• Plasma

Which beaker serves as the baseline for comparison in the experiment? (Control)

• The beaker without any modifications

• The beaker with sugar added

• The beaker with the highest temperature

• The beaker filled with water

Emma, Abigail, and William each have a candle in different-sized jars. Which candle will burn the longest?

• The candle in the smallest jar

• The candle in the medium jar

• The candle in the largest jar

• All candles will burn for the same time

Nora is conducting an experiment where she adds ice cubes to a glass of water. What happens to the total mass of water when the ice melts?

• Decreases after melting

• Remains unchanged

• Increases after melting

• Varies based on the water temperature

What process leads to the formation of dew on grass?

• Evaporation

• Condensation

• Melting

• Freezing

When magnesium reacts with hydrochloric acid, what type of reaction occurs?

• Combustion

• Neutralization

• Displacement

• Oxidation

Which processes change sedimentary rock into metamorphic rock?

• Freezing and thawing

• Heating and pressure

• Erosion and weathering

• Deposition and layering

Which statement about atoms is correct?

• Atoms are the smallest unit of matter and cannot be divided

• Atoms consist of protons, neutrons, and electrons

• Atoms of the same element always have different masses

• Atoms are visible under a regular microscope

Which is the thickest layer of Earth?

• Crust

• Mantle

• Outer core

• Inner core

What instrument is best suited for determining the weight of an object?

• Graduated pipette

• Barometer

• Scale

• Clock