Unit 4 Chemical Quantities and Reactions

Front

What does CH4 represent in the balanced chemical equation C + 2H2 → CH4?

Back

one molecule of CH4

Front

What is the number of representative particles in a mole called?

Back

Avogadro’s number

Front

In the reaction 2Al + 3H2SO4 -> Al2(SO4)3 + 3H2, how many grams of aluminum sulfate are formed from 250g of H2SO4?

Back

290 g

Front

What are the coefficients needed to balance the equation 2Al + 3H2SO4 -> Al2(SO4)3 + 3H2?

Back

2, 3, 1, 3

Front

Is the equation 2Al + 3H2SO4 -> Al2(SO4)3 + 3H2 balanced?

Back

no

Front

What is the significance of Avogadro's number in chemistry?

Back

It defines the number of representative particles (atoms, molecules, etc.) in one mole of a substance, approximately 6.022 x 10^23.

Front

What is a balanced chemical equation?

Back

A chemical equation where the number of atoms for each element is the same on both sides of the equation.

Front

What is the molar mass of aluminum sulfate (Al2(SO4)3)?

Back

The molar mass is approximately 342.15 g/mol.

Front

How do you determine the limiting reactant in a chemical reaction?

Back

By calculating the amount of product formed from each reactant and identifying which reactant produces the least amount of product.

Front

What is the purpose of balancing chemical equations?

Back

To ensure the law of conservation of mass is upheld, meaning matter is neither created nor destroyed in a chemical reaction.