Chemistry review PS8.1-5

Front

What effect does observing the physical properties of a substance have on the substance?

Back

Observing physical properties has no effect on the substance.

Front

The Law of Conservation of Mass says that matter can neither be __________ or __________.

Back

created; destroyed.

Front

The amount of matter something contains is its ______________.

Back

mass.

Front

How many valence electrons does the element have if it has 1 valence electron?

Back

1.

Front

Alanine is an amino acid with formula C3H7NO2. How many atoms in all are in each molecule of alanine?

Back

13.

Front

What is the definition of mass in chemistry?

Back

Mass is the amount of matter in an object.

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 reaction.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat.

Front

What is the formula for calculating density?

Back

Density = Mass/Volume.

Front

What is a valence electron?

Back

A valence electron is an electron in the outermost shell of an atom that can participate in forming chemical bonds.