chapters 1-4 chemistry review

Front

Which element has similar properties to Beryllium (Be)?

Back

Magnesium (Mg) is in the same group as Beryllium and shares similar properties.

Front

What is the mass of 6.02 x 10^23 molecules of CO2?

Back

The mass is 44.0 g.

Front

How do you identify the limiting reagent in a chemical reaction?

Back

The limiting reagent is the reactant that is completely consumed first, limiting the amount of product formed.

Front

In the reaction Mg + 2HCl -> MgCl2 + H2, what is the limiting reagent when 6.00 g HCl combines with 5.00 g Mg?

Back

Hydrochloric acid (HCl) is the limiting reagent.

Front

What is the result of the reaction 4NH3 + 5O2 -> 4NO + 6H2O?

Back

1.35 g of NO are formed when 6.30 g of ammonia react with 1.80 g of oxygen.

Front

Is sharpening a pencil a physical or chemical change?

Back

Sharpening a pencil is a physical change.

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 is a chemical change?

Back

A chemical change results in the formation of new chemical substances.

Front

What is the molar mass of CO2?

Back

The molar mass of CO2 is 44.01 g/mol.

Front

How do you calculate the number of moles from mass?

Back

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