Honors Chemistry Final Exam

Front

What is the most important piece of safety equipment to wear when working with chemicals or fire?

Back

Goggles/Safety glasses are essential to protect your eyes from harmful substances.

Front

How do you calculate the volume of a substance given its mass and density?

Back

Volume = Mass / Density. For example, for 350.0 g of antifreeze with a density of 1.21 g/mL, Volume = 350.0 g / 1.21 g/mL = 289 mL.

Front

What is the formula to calculate Specific Heat?

Back

q = m x C x ΔT, where q is heat absorbed, m is mass, C is specific heat, and ΔT is the change in temperature.

Front

What is the Specific Heat of a substance if 48.0 J of heat is absorbed by a 12.0 g sample heated from 20.0 to 40.0 degrees Celsius?

Back

Specific Heat = q / (m x ΔT) = 48.0 J / (12.0 g x 20.0°C) = 0.200 J/g°C.

Front

What type of change occurs when water boils to become steam?

Back

It undergoes a physical change.

Front

How do you express a number in scientific notation?

Back

Move the decimal point to create a number between 1 and 10, then multiply by 10 raised to the number of places moved.

Front

Convert 0.00000618 to scientific notation.

Back

6.18 x 10^-6.

Front

What is the definition of density?

Back

Density is the mass of a substance divided by its volume (Density = Mass/Volume).

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the formula for calculating the mass of a substance using density and volume?

Back

Mass = Density x Volume.