8th Grade Fall Semester Exam

Front

What is the chemical formula for the reaction between sulfur dioxide and hydrogen peroxide?

Back

Front

How many hydrogen atoms are produced in the reaction of 2SO2 and 2H2O2?

Back

4 hydrogen atoms are present in the products.

Front

What are the primary components of the sun?

Back

The sun is primarily made up of Hydrogen and Helium.

Front

Define adhesive in the context of water molecules.

Back

Adhesive refers to the property that allows water molecules to stick to other surfaces.

Front

Which type of electromagnetic radiation has the longest wavelength?

Back

Infrared rays have the longest wavelength and the lowest frequency/energy.

Front

What is surface tension?

Back

Surface tension is the tightness across the surface of water that enables objects like paper clips to float.

Front

What is the definition of polarity in chemistry?

Back

Polarity refers to the distribution of electrical charge over the atoms joined by the bond.

Front

Explain capillary action.

Back

Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of external forces.

Front

What is the significance of hydrogen in the universe?

Back

Hydrogen is the most abundant element in the universe and is a primary fuel for stars.

Front

What is the relationship between wavelength and frequency?

Back

Wavelength and frequency are inversely related; as wavelength increases, frequency decreases.