Practice Chemistry Regents 12-13-2024

Front

What is an endothermic process?

Back

An endothermic process is a reaction or change that absorbs heat from its surroundings, resulting in a decrease in temperature of the surroundings.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What distinguishes diamond from graphite?

Back

Diamond and graphite are both forms of carbon but have different crystal structures and properties; diamond is hard and has a tetrahedral structure, while graphite is soft and has a layered structure.

Front

What is the significance of intermolecular forces in boiling points?

Back

The strength of intermolecular forces determines the boiling point of a substance; weaker forces result in lower boiling points.

Front

What is the relationship between concentration and conductivity in solutions?

Back

Higher concentration of ions in a solution increases its ability to conduct electricity, as more charged particles are available to carry the current.

Front

What does conservation of mass state?

Back

Conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is a chemical change?

Back

A chemical change is a process that involves the transformation of one or more substances into different substances with distinct properties.

Front

Define covalent bonds. What is their role in molecular compounds?

Back

Covalent bonds are chemical bonds formed by the sharing of electrons between atoms. They determine the structure and properties of molecular compounds.

Front

What is the difference between strong and weak intermolecular forces?

Back

Strong intermolecular forces lead to higher boiling and melting points, while weak intermolecular forces result in lower boiling and melting points.

Front

What is the formula for calculating molarity?

Back

Molarity (M) = moles of solute / liters of solution.