Physical Science 9 Final Exam Review

Front

What is a polyatomic ion?

Back

A polyatomic ion is a charged ion composed of two or more atoms covalently bonded, which can be considered as a single unit. Examples include sulfate (SO4^2-) and nitrate (NO3^-).

Front

Which of the following is NOT a polyatomic ion?

Back

Cl^- is NOT a polyatomic ion; it is a monatomic ion.

Front

What effect does an increase in temperature have on reaction rates?

Back

An increase in temperature generally increases the collision frequency and energy of particles, leading to a higher reaction rate.

Front

Define a catalyst.

Back

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.

Front

What is the balanced equation for the reaction of zinc and hydrochloric acid?

Back

The balanced equation is: Zn + 2HCl → ZnCl2 + H2.

Front

How do you calculate density?

Back

Density is calculated using the formula: Density = Mass/Volume.

Front

If a substance has a mass of 12.9 g and a volume of 8 cm³, what is its density?

Back

Density = 12.9 g / 8 cm³ = 1.61 g/cm³.

Front

What is the mass of a 10.5 cm³ sample of a substance with a density of 1.61 g/cm³?

Back

Mass = Density × Volume = 1.61 g/cm³ × 10.5 cm³ = 16.91 g.

Front

What is the role of reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change to form products.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.