H Chem Midterm Review Term 1

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement in chemistry that represents 6.02 x 10^23 particles (atoms, molecules, etc.) of a substance.

Front

How many atoms are in one mole of any substance?

Back

One mole of any substance contains 6.02 x 10^23 atoms.

Front

What does the notation '12C' represent?

Back

The notation '12C' indicates that the carbon atom has 6 protons and 6 neutrons, with 12 being the mass number.

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that becomes evident during a chemical reaction, such as reactivity with water.

Front

What happens when an atom emits a photon?

Back

When an atom emits a photon, it loses energy and transitions to a lower energy state.

Front

In the reaction 2Na + 2H2O → 2NaOH + H2, what is produced?

Back

The reaction produces sodium hydroxide (NaOH) and hydrogen gas (H2).

Front

How do you calculate the mass of a product in a chemical reaction?

Back

Use stoichiometry based on the balanced chemical equation and the molar masses of the reactants and products.

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in an atom and determines the element's identity.

Front

What is the difference between physical and chemical properties?

Back

Physical properties can be observed without changing the substance's identity, while chemical properties can only be observed during a chemical change.

Front

What is reactivity in chemistry?

Back

Reactivity refers to how readily a substance undergoes a chemical reaction with other substances.