Semester 1 final exam chemistry

Front

What is scientific notation?

Back

A way of expressing numbers that are too large or too small to be conveniently written in decimal form, using powers of ten.

Front

Convert 0.0000007841 g to scientific notation.

Back

7.841 x 10^-7 g

Front

What is the formula for Silver (I) oxide?

Back

Ag₂O

Front

What is the net ionic equation for the reaction of AgNO₃ and CaCl₂?

Back

Ag⁺(aq) + Cl^-(aq) → AgCl(s)

Front

What is the formula for Iron (II) oxide?

Back

FeO

Front

How do you calculate the number of moles from grams?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of water (H₂O)?

Back

18 g/mol.

Front

How many moles are in 45 g of water?

Back

2.5 moles.

Front

What is a net ionic equation?

Back

An equation that shows only the species that actually participate in the reaction.

Front

What is the significance of the coefficients in a balanced chemical equation?

Back

They indicate the relative amounts of reactants and products involved in the reaction.