Semester 1 review F 24 Bonus Review Flashcard

Front

What are metalloids?

Back

Metalloids are elements that have properties intermediate between metals and nonmetals. They are typically semiconductors of electricity and are found on the periodic table between metals and nonmetals.

Front

Which color on the periodic table represents metalloids?

Back

Bright yellow.

Front

How do you calculate percent composition?

Back

Percent composition is calculated by dividing the mass of each element in a compound by the total mass of the compound and then multiplying by 100.

Front

What is the percent composition of N2S2?

Back

N: 30.4%, S: 69.6%.

Front

What is a molecular formula?

Back

A molecular formula shows the number and type of atoms in a molecule, indicating the actual number of each atom present.

Front

What is the empirical formula of a compound?

Back

The empirical formula is the simplest whole-number ratio of the elements in a compound.

Front

If the empirical formula is C2H5 and the molar mass is 58.14 g/mol, what is the molecular formula?

Back

C4H10.

Front

What is the difference between an empirical formula and a molecular formula?

Back

The empirical formula represents the simplest ratio of elements, while the molecular formula shows the actual number of atoms of each element in a molecule.

Front

What is the chemical formula for water?

Back

H2O.

Front

What is the chemical formula for methane?

Back

CH4.